JPH0571815A - Operation controller for air conditioning apparatus - Google Patents
Operation controller for air conditioning apparatusInfo
- Publication number
- JPH0571815A JPH0571815A JP3231886A JP23188691A JPH0571815A JP H0571815 A JPH0571815 A JP H0571815A JP 3231886 A JP3231886 A JP 3231886A JP 23188691 A JP23188691 A JP 23188691A JP H0571815 A JPH0571815 A JP H0571815A
- Authority
- JP
- Japan
- Prior art keywords
- air
- electric expansion
- indoor heat
- expansion valve
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/21—Refrigerant outlet evaporator temperature
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
(57)【要約】
【目的】空気調和装置の冷房運転時における除湿能力と
室温制御機能とを維持し、空調の快適性を向上させる。
【構成】空調ユニットＡ内の通風路６に一対の第１，第
２室内熱交換器７ａ，７ｂを並列に配設し、各室内熱交
換器７ａ，７ｂを冷媒回路内に並列に接続し、かつ各室
内熱交換器７ａ，７ｂ毎に第１電動膨張弁ＥＶ１，ＥＶ
２をそれぞれ設ける。第１開度制御手段５１により、空
気温度検出手段Ｔｈａで検出される空気温度が設定値に
収束するよう第１電動膨張弁ＥＶ１の開度を制御する一
方、第２開度制御手段５２により、過熱度検出手段５０
で検出される過熱度が目標値に収束するよう第２電動膨
張弁ＥＶ２の開度を制御する。これにより、室温を適正
に維持しながら除湿量を確保する。
(57) [Abstract] [Purpose] To maintain the dehumidifying capacity and the room temperature control function during the cooling operation of the air conditioner to improve the comfort of air conditioning. [Structure] A pair of first and second indoor heat exchangers 7a, 7b are arranged in parallel in an air passage 6 in an air conditioning unit A, and each indoor heat exchanger 7a, 7b is connected in parallel in a refrigerant circuit. , And the first electric expansion valves EV1, EV for each indoor heat exchanger 7a, 7b
2 are provided respectively. The first opening control means 51 controls the opening of the first electric expansion valve EV1 so that the air temperature detected by the air temperature detection means Tha converges to a set value, while the second opening control means 52 controls the opening. Superheat detection means 50
The opening degree of the second electric expansion valve EV2 is controlled so that the degree of superheat detected in step S2 converges to the target value. As a result, the dehumidification amount is secured while maintaining the room temperature appropriately.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空気調和装置の運転制
御装置に係り、特に除湿性能及び室温制御性能の向上対
策に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner operation control device, and more particularly to measures for improving dehumidification performance and room temperature control performance.
【０００２】[0002]
【従来の技術】従来より、例えば特開昭５９―１２５３
６１号公報に開示される如く、圧縮機、室外熱交換器、
膨脹弁及び室外熱交換器を順次接続してなる冷媒回路を
備えるとともに、冷房運転時に室内熱交換器の吹出空気
を再加熱する再加熱器を設けることにより、熱交換器の
表面温度を露点以下に下げるとともに、吹出空気温度を
上昇させて、高温の吹出空気を要求されるような冷房運
転時における除湿能力の不足を補い、空調の快適性の向
上を図ろうとするものは公知の技術である。2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 59-1253.
61, a compressor, an outdoor heat exchanger,
The surface temperature of the heat exchanger is below the dew point by providing a refrigerant circuit that sequentially connects the expansion valve and the outdoor heat exchanger, and by providing a reheater that reheats the air blown from the indoor heat exchanger during cooling operation. It is a well-known technique that attempts to improve the comfort of air conditioning by increasing the temperature of the blown air and increasing the temperature of the blown air to compensate for the lack of dehumidifying ability during the cooling operation that requires high temperature blown air. ..
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来のものでは、再加熱することによりエネルギーロスを
生じるので、運転効率が悪化するとともに、システムが
複雑となり、設備コストが高く付くという問題がある。However, in the above-mentioned conventional apparatus, energy loss occurs due to reheating, so that there is a problem that operating efficiency is deteriorated, the system becomes complicated, and equipment cost increases.
【０００４】その一方、熱交温度をあまりに下げること
は吹出空気温度が過度に低下することになり、空調空間
の温度制御が無視される結果、空調の快適性が悪化する
虞れがある。On the other hand, if the heat exchange temperature is lowered too much, the temperature of the blown air will be excessively lowered, and the temperature control of the air-conditioned space will be ignored. As a result, the comfort of air conditioning may be deteriorated.
【０００５】本発明は斯かる点に鑑みてなされたもので
あり、その目的は、室内熱交換器を２つに分割し、各々
を別系統にして能力制御することにより、室内空間の空
気温度を適正に維持しながら、空調空気の除湿を行い、
もって、空調の快適性の向上を図ることにある。The present invention has been made in view of the above problems, and an object thereof is to divide the indoor heat exchanger into two parts and to control the capacity of each by making them into separate systems so that the air temperature in the indoor space can be controlled. Dehumidifying the conditioned air while maintaining
Therefore, it is to improve the comfort of air conditioning.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明の講じた手段は、図１に示すよう
に、空調ユニット（Ａ）内の通風路（６）に、一対の第
１、第２室内熱交換器（７ａ），（７ｂ）を互いに並列
に収納するとともに、冷媒回路中で上記各室内熱交換器
（７ａ），（７ｂ）を互いに並列に接続し、かつ各室内
熱交換器（７ａ），（７ｂ）ごとに第１、第２電動膨張
弁（ＥＶ１），（ＥＶ２）を設けてなる空気調和装置を
前提とする。Means for Solving the Problems To achieve the above object, the means of the present invention as set forth in claim 1 is provided with a pair of ventilation passages (6) in an air conditioning unit (A) as shown in FIG. The first and second indoor heat exchangers (7a), (7b) are housed in parallel with each other, and the indoor heat exchangers (7a), (7b) are connected in parallel with each other in the refrigerant circuit, and It is assumed that the indoor heat exchangers (7a) and (7b) are provided with the first and second electric expansion valves (EV1) and (EV2), respectively.
【０００７】そして、空気調和装置の運転制御装置とし
て、室内空間の空気温度を検出する空気温度検出手段
（Ｔｈａ）と、該空気温度検出手段（Ｔｈａ）の出力を
受け、空気温度が設定温度になるよう上記第１電動膨張
弁（ＥＶ１）の開度を制御する第１開度制御手段（５
１）と、上記第２室内熱交換器（７ｂ）出口の過熱度を
検出する過熱度検出手段（５０）と、冷房運転時、該過
熱度検出手段（５０）の出力を受け、過熱度が目標値に
なるよう上記第２電動膨張弁（ＥＶ２）の開度を制御す
る第２開度制御手段（５２）とを設ける構成としたもの
である。As an operation control device of the air conditioner, an air temperature detecting means (Tha) for detecting the air temperature of the indoor space and an output of the air temperature detecting means (Tha) are received, and the air temperature becomes a set temperature. The first opening control means (5) for controlling the opening of the first electric expansion valve (EV1) so that
1), a superheat degree detecting means (50) for detecting the superheat degree at the outlet of the second indoor heat exchanger (7b), and an output of the superheat degree detecting means (50) during the cooling operation, and the superheat degree is A second opening control means (52) for controlling the opening of the second electric expansion valve (EV2) so that the target value is achieved is provided.
【０００８】請求項２の発明の講じた手段は、図１の破
線部分に示すように、上記請求項１の発明において、冷
房運転時、第１電動膨張弁の（ＥＶ２）が全閉のときに
は、空気温度検出手段（Ｔｈａ）で検出される空気温度
に応じて第２電動膨張弁（ＥＶ２）の開度を制御するよ
う第２開度制御手段（５２）の制御指標を変更する制御
指標変更手段（５３）を設けたものである。As shown by the broken line portion in FIG. 1, the means taken by the invention of claim 2 is, in the invention of claim 1, when the first electric expansion valve (EV2) is fully closed during cooling operation. , Changing the control index of the second opening degree control means (52) so as to control the opening degree of the second electric expansion valve (EV2) according to the air temperature detected by the air temperature detecting means (Tha) Means (53) are provided.
【０００９】[0009]
【作用】以上の構成により、請求項１の発明では、空調
ユニット（Ａ）内の通風路（６）に、一対の室内熱交換
器（７ａ），（７ｂ）が設置され、第１室内熱交換器
（７ａ）の能力については、第１開度制御手段（５１）
により、第１電動膨張弁（ＥＶ１）の開度が空気温度に
応じて制御される一方、第２室内熱交換器（７ｂ）の能
力については、第２開度制御手段（５２）により、第２
電動膨張弁（ＥＶ２）の開度が過熱度に応じて制御され
る。With the above construction, in the invention of claim 1, the pair of indoor heat exchangers (7a) and (7b) are installed in the ventilation passage (6) in the air conditioning unit (A), and the first indoor heat exchanger is installed. Regarding the capacity of the exchanger (7a), the first opening control means (51)
Thus, the opening degree of the first electric expansion valve (EV1) is controlled according to the air temperature, while regarding the capacity of the second indoor heat exchanger (7b), the second opening degree control means (52) Two
The opening degree of the electric expansion valve (EV2) is controlled according to the degree of superheat.
【００１０】したがって、第２室内熱交換器（７ｂ）側
で熱交表面温度を露点以下に維持することで、空調空気
の除湿が行われる一方、第１室内熱交換器（７ａ）側で
吹出空気や吸込空気などの空気温度が制御目標値になる
よう制御され、室内空間の空気温度が適正に維持される
ことになる。Therefore, by keeping the heat exchange surface temperature below the dew point on the side of the second indoor heat exchanger (7b), dehumidification of the conditioned air is performed, while on the other hand, on the side of the first indoor heat exchanger (7a) The temperature of air such as air and suction air is controlled to reach the control target value, and the temperature of air in the indoor space is appropriately maintained.
【００１１】請求項２の発明では、室内空間の空気温度
が極めて高い条件下において、空気温度による開度制御
を行う第１電動膨張弁（ＥＶ１）の開度が全閉のときに
は、第１室内熱交換器（７ｂ）側で過熱度に基づく制御
が行われると、除湿量は大きいものの室内空間の空気温
度が低下して制御目標値から大きく外れることになる
が、制御指標変更手段（５３）により第２開度制御手段
（５２）の制御指標が変更され、第２電動膨張弁（ＥＶ
２）の開度が空気温度に応じて制御されるので、かかる
条件下でも、除湿機能が保たれるとともに、室内空間の
空気温度が適正に維持される。According to the second aspect of the invention, under the condition that the air temperature in the indoor space is extremely high, when the opening degree of the first electric expansion valve (EV1) for controlling the opening degree by the air temperature is fully closed, the first indoor room is opened. When the control based on the degree of superheat is performed on the heat exchanger (7b) side, although the dehumidifying amount is large, the air temperature in the indoor space decreases and deviates largely from the control target value, but the control index changing means (53). By this, the control index of the second opening control means (52) is changed, and the second electric expansion valve (EV
Since the opening degree of 2) is controlled according to the air temperature, the dehumidifying function is maintained and the air temperature in the indoor space is appropriately maintained even under such conditions.
【００１２】[0012]
【実施例】以下、本発明の実施例について、図２以下の
図面に基づき説明する。Embodiments of the present invention will be described below with reference to the drawings starting from FIG.
【００１３】図２は実施例に係る空気調和装置の縦断面
構造を示し、空気調和装置の空調ユニット（Ａ）のケー
シング（１）は床面（Ｆ）上に設置され、該ケーシング
（１）内において、ケーシング（１）の下方に向かって
空調空気を送風する送風ファン（２）が配設されてお
り、ケーシング（１）の上方に開口された空気吸込口
（３）から下方の空気吹出口（５）に向かって空調空気
が流通する第１通風路（６）が形成されている。そし
て、この第１通風路（６）の上記送風ファン（２）の直
上には一対の第１，第２室内熱交換器（７ａ），（７
ｂ）が互いに並列に配設されている。また、該各室内熱
交換器（７ａ），（７ｂ）は、冷媒回路内で互いに並列
に接続されるとともに、その各々に第１，第２電動膨張
弁（ＥＶ１），（ＥＶ２）が設けられており、各電動膨
張弁（ＥＶ１），（ＥＶ２）の開度は後述のごとく個別
に制御されるようになされている。FIG. 2 shows a longitudinal sectional structure of the air conditioner according to the embodiment, in which the casing (1) of the air conditioning unit (A) of the air conditioner is installed on the floor surface (F), and the casing (1) is installed. Inside, a blower fan (2) for blowing conditioned air downwardly of the casing (1) is provided, and an air blower downward (3) is opened from an air suction port (3) opened above the casing (1). A first ventilation path (6) through which the conditioned air flows toward the outlet (5) is formed. A pair of first and second indoor heat exchangers (7a), (7) is provided directly above the blower fan (2) in the first ventilation passage (6).
b) are arranged in parallel with each other. The indoor heat exchangers (7a) and (7b) are connected in parallel with each other in the refrigerant circuit, and first and second electric expansion valves (EV1) and (EV2) are provided in each of them. The opening degree of each of the electric expansion valves (EV1) and (EV2) is individually controlled as described later.
【００１４】また、上記ケーシング（１）が設置される
床面（Ｆ）の上記空気吹出口（５）に対峙する部位には
空気流入口（９）が開口されており、さらに床面（Ｆ）
の内部には、空気流入口（９）から流入した空調空気が
流通する第２通風路（１０）が形成されていて、該第２
通風路（１０）の室内側に隣接する床面（Ｆ）の壁面に
は、数箇所に空調空気の供給口（１１），…が設けられ
ている。すなわち、空調ユニット（Ａ）のケーシング
（１）の空気吹出口（５）から吹出される空調空気を第
２通風路（１０）に流通させ、床面（Ｆ）の各部に設け
られた各供給口（１１），…から室内上方に向かって空
調空気を吹出すようにしている。Further, an air inlet (9) is opened at a portion of the floor surface (F) on which the casing (1) is installed facing the air outlet (5), and the floor surface (F) is further opened. )
A second ventilation path (10) through which the conditioned air that has flowed in from the air inlet (9) flows is formed inside the
On the wall surface of the floor surface (F) adjacent to the indoor side of the ventilation path (10), air-conditioning air supply ports (11), ... Are provided at several places. That is, the conditioned air blown out from the air outlet (5) of the casing (1) of the air conditioning unit (A) is circulated in the second ventilation passage (10), and each supply provided in each part of the floor surface (F). Air-conditioned air is blown upward from the mouths (11).
【００１５】そして、空気調和装置には温度センサ類が
配置されており、（Ｔｈａ）は第２通風路（１０）に配
置され、吹出空気温度Ｔａを検出する空気温度検出手段
としての吹出温センサ、（Ｔｈｒ）は室内温度Ｔｒを検
出する室温センサ、（Ｔｈｗ）は湿度を検出する湿度セ
ンサ、（Ｔｈｉ１），（Ｔｈｉ２）は、それぞれ第１、
第１室内熱交換器（７ａ），（７ｂ）の液管温度Ｔｉ
１，Ｔｉ２を検出する第１、第２液管センサ、（Ｔｇ
１），（Ｔｇ２）は、それぞれ第１、第２室内熱交換器
（７ａ），（７ｂ）のガス管温度Ｔｇ１，Ｔｇ２を検出
する第１，第２ガス管センサである。上記ガス管センサ
（Ｔｈｇ１），（Ｔｈｇ２）で検出されるガス管温度Ｔ
ｇ１，Ｔｇ２と、各液管センサ（Ｔｈｉ１），（Ｔｈｉ
２）で検出されるガス管温度Ｔｇ１，Ｔｇ２との温度差
（Ｔｇ１−Ｔｉ１），（Ｔｇ２−Ｔｉ２）により冷媒の
過熱度Ｓｈ１，Ｓｈ２が求められる。特に、上記第２ガ
ス管センサ（Ｔｈｇ２）及び第２液管センサ（Ｔｈｉ
２）により、本発明にいう過熱度検出手段（５０）が構
成されている。Further, temperature sensors are arranged in the air conditioner, (Tha) is arranged in the second ventilation passage (10), and an outlet temperature sensor as an air temperature detecting means for detecting the outlet air temperature Ta. , (Thr) are room temperature sensors that detect the room temperature Tr, (Thw) are humidity sensors that detect humidity, and (Thi1) and (Thi2) are the first and
Liquid pipe temperature Ti of the first indoor heat exchangers (7a), (7b)
1st and 2nd liquid pipe sensor which detects 1 and Ti2, (Tg
1) and (Tg2) are first and second gas pipe sensors for detecting the gas pipe temperatures Tg1 and Tg2 of the first and second indoor heat exchangers (7a) and (7b), respectively. Gas pipe temperature T detected by the gas pipe sensors (Thg1) and (Thg2)
g1, Tg2, and each liquid pipe sensor (Thi1), (Thi
The superheats Sh1, Sh2 of the refrigerant are obtained from the temperature differences (Tg1-Ti1), (Tg2-Ti2) from the gas pipe temperatures Tg1, Tg2 detected in 2). In particular, the second gas pipe sensor (Thg2) and the second liquid pipe sensor (Thi)
The superheat degree detecting means (50) according to the present invention is constituted by 2).
【００１６】そして、上記各センサは空気調和装置のコ
ントローラ（２０）に信号線で接続されており、該コン
トローラ（２０）により、上記各センサの信号に応じて
空気調和装置の運転を制御するようになされている。特
に、第１室内熱交換器（７ａ）側では、その能力を調節
する第１電動膨張弁（ＥＶ１）の開度Ｅ１は主として吹
出空気温度Ｔａに応じ、第２電動膨張弁（ＥＶ２）の開
度Ｅ２は主として過熱度Ｓｈ２に応じて制御されるよう
になされている。以下、各電動膨張弁（ＥＶ１），（Ｅ
Ｖ２）の開度制御の内容について、図３及び図４のフロ
―チャ―トに基づき説明する。Each sensor is connected to a controller (20) of the air conditioner by a signal line, and the controller (20) controls the operation of the air conditioner according to the signal of each sensor. Has been done. In particular, on the side of the first indoor heat exchanger (7a), the opening degree E1 of the first electric expansion valve (EV1) for adjusting its capacity mainly depends on the blown air temperature Ta and the opening degree of the second electric expansion valve (EV2). The degree E2 is mainly controlled according to the degree of superheat Sh2. Hereinafter, each electric expansion valve (EV1), (E
The contents of the opening degree control of V2) will be described based on the flowcharts of FIGS. 3 and 4.
【００１７】図３は、冷房運転時における第１室内熱交
換器（７ａ）の能力制御モジュールＳＴ１Ｍを示し、ま
ず、ステップＳＴ１１で、第１電動膨張弁（ＥＶ１）の
開度Ｅ１を制御するための変数について、現在値Ｅｓ１
を前回値Ｅｃ１とする変数の更新を行った後、ステップ
ＳＴ１２で、上記吹出温センサ（Ｔｈａ）の検出値Ｔａ
から、Ｅｓ１＝Ｔａ−Ｔｓ（ただし、Ｔｓは吹出空気温
度Ｔａの制御目標値）として、新しい変数の現在値Ｅｓ
１を求める。そして、ステップＳＴ１３で、変数値Ｅｓ
１と不感帯幅ΔＴｄ１（例えば０．５℃程度の温度幅）
とを比較し、｜Ｅｓ１｜＜ΔＴｄ１でなければ、ステッ
プＳＴ１４で、下記式（１） ΔＥ１＝Ｋc1｛（Ｅs1−Ｅc1）＋（Δｔs1／２Ｔi1）（Ｅs1＋Ｅc1）｝ (1) （ただし、Ｋc はゲイン、Ｔi は積分時間、Δｔs はサ
ンプリング時間であって、後述の(2) 式においても添字
は異なるが同様である）に基づき第１電動膨張弁（ＥＶ
１）の開度変更値ΔＥ１を演算する一方、｜Ｅｓ１｜＜
ΔＴｄ１であれば、現在の開度を変更する必要はないと
判断して、ステップＳＴ１５で、ΔＥ１＝０とする。そ
して、ステップＳＴ１６で、第１電動膨張弁（ＥＶ１）
の新開度Ｅ１について、Ｅ１＝Ｅ１＋ΔＥ１とし、第１
室内熱交換器（７ａ）の能力制御モジュールを終了す
る。FIG. 3 shows the capacity control module ST1M of the first indoor heat exchanger (7a) during the cooling operation. First, in step ST11, the opening E1 of the first electric expansion valve (EV1) is controlled. Current value Es1 for the variable
Is updated to the previous value Ec1 and then, in step ST12, the detected value Ta of the blow-out temperature sensor (Tha) is detected.
Therefore, as Es1 = Ta−Ts (where Ts is the control target value of the blown air temperature Ta), the current value Es of the new variable is set.
Ask for 1. Then, in step ST13, the variable value Es
1 and dead band width ΔTd1 (for example, a temperature width of about 0.5 ° C.)
If it is not | Es1 | <ΔTd1, the following equation (1) ΔE1 = Kc1 {(Es1−Ec1) + (Δts1 / 2Ti1) (Es1 + Ec1)} (1) (where Kc is The gain, Ti is the integration time, and Δts is the sampling time. The same applies although the subscripts are different even in the equation (2) described later).
While the opening change value ΔE1 in 1) is calculated, | Es1 | <
If ΔTd1, it is determined that it is not necessary to change the current opening degree, and ΔE1 = 0 is set in step ST15. Then, in step ST16, the first electric expansion valve (EV1)
The new opening E1 of E1 = E1 + ΔE1
The capacity control module of the indoor heat exchanger (7a) is terminated.
【００１８】次に、図４は、第２室内熱交換器（７ｂ）
の能力制御モジュールＳＴ２Ｍを示し、まず、ステップ
ＳＴ２１で、第２電動膨張弁（ＥＶ２）の開度を制御す
るための変数について、現在値Ｅｓ２を前回値Ｅｃ２と
する変数の更新を行った後、ステップＳＴ２２で、上記
第２液管センサ（Ｔｈｉ２）及び第２ガス管センサ（Ｔ
ｈｇ２）の検出値Ｔｉ２，Ｔｇ２から、Ｅｓ２＝Ｔｇ２
−Ｔｉ２（つまり、過熱度）として、新しい変数の現在
値Ｅｓ２を求める。そして、ステップＳＴ２３で、第１
電動膨張弁（ＥＶ１）の開度Ｅ１が「０」か否かを判別
し、Ｅ１＝０であれば、第１室内熱交換器（７ａ）側の
能力が「０」であるため、吹出空気温度Ｔａを優先的に
制御すべく、ステップＳＴ２４で、上記式（１）を利用
し、Ｅ１の変わりにＥ２を代入して第２電動膨張弁（Ｅ
Ｖ２）の開度Ｅ２を演算する。Next, FIG. 4 shows the second indoor heat exchanger (7b).
Of the capacity control module ST2M, first, in step ST21, for variables for controlling the opening degree of the second electric expansion valve (EV2), after updating the variables whose current value Es2 is the previous value Ec2, In step ST22, the second liquid pipe sensor (Thi2) and the second gas pipe sensor (T2).
From the detected values Ti2 and Tg2 of hg2), Es2 = Tg2
The current value Es2 of a new variable is obtained as −Ti2 (that is, the degree of superheat). Then, in step ST23, the first
It is determined whether or not the opening degree E1 of the electric expansion valve (EV1) is "0". If E1 = 0, the capacity on the first indoor heat exchanger (7a) side is "0", so the blown air In order to control the temperature Ta preferentially, in step ST24, the above formula (1) is used, E2 is substituted for E1, and the second electric expansion valve (E
The opening E2 of V2) is calculated.
【００１９】次に、ステップＳＴ２５で、変数値Ｅｓ２
と不感帯幅ΔＴｄ２（例えば０．５℃程度の温度幅）と
を比較し、｜Ｅｓ２｜＜ΔＴｄ２でなければ、ステップ
ＳＴ２６で、下記式（２） ΔＥ１＝Ｋc2｛（Ｅs2−Ｅc2）＋（Δｔs2／２Ｔi2）（Ｅs2＋Ｅc2）｝ (2) に基づき第２電動膨張弁（ＥＶ２）の開度変更値ΔＥ２
を演算する一方、｜Ｅｓ２｜＜ΔＴｄ２であれば、現在
の開度を変更する必要はないと判断して、ステップＳＴ
２７で、ΔＥ２＝０とする。そして、ステップＳＴ２８
で、第２電動膨張弁（ＥＶ２）の新開度Ｅ２について、
Ｅ２＝Ｅ２＋ΔＥ２とし、第２室内熱交換器（７ｂ）の
能力制御モジュールを終了する。Next, in step ST25, the variable value Es2
And the dead zone width ΔTd2 (for example, a temperature width of about 0.5 ° C.) are compared, and if | Es2 | <ΔTd2 is not satisfied, in step ST26, the following equation (2) ΔE1 = Kc2 {(Es2-Ec2) + (Δts2 / 2Ti2) (Es2 + Ec2)} (2) based on the opening change value ΔE2 of the second electric expansion valve (EV2)
On the other hand, if | Es2 | <ΔTd2, it is determined that it is not necessary to change the current opening degree, and step ST
At 27, ΔE2 = 0. Then, step ST28
Then, regarding the new opening E2 of the second electric expansion valve (EV2),
E2 = E2 + ΔE2 is set, and the capacity control module of the second indoor heat exchanger (7b) is terminated.
【００２０】上記フローにおいて、ステップＳＴ１４及
びＳＴ１６の制御により、本発明にいう第１開度制御手
段（５１）が構成され、ステップＳＴ２６及びＳＴ２８
の制御により、本発明にいう第２開度制御手段（５２）
が構成されている。また、ステップＳＴ２４及びＳＴ２
８の制御により、請求項２の発明にいう制御指標変更手
段（５３）が構成されている。In the above flow, the first opening control means (51) according to the present invention is constituted by the control of steps ST14 and ST16, and steps ST26 and ST28.
By controlling the second opening control means (52) according to the present invention.
Is configured. Also, steps ST24 and ST2
By the control of 8, the control index changing means (53) according to the invention of claim 2 is constituted.
【００２１】したがって、上記実施例では、空調ユニッ
ト（Ａ）のケーシング（１）内に形成される第１通風路
（６）に、一対の室内熱交換器（７ａ），（７ｂ）が設
置され、第１室内熱交換器（７ａ）の能力については、
第１開度制御手段（５１）により、第１電動膨張弁（Ｅ
Ｖ１）の開度Ｅ１が吹出空気温度Ｔａを設定温度Ｔｓに
収束させるよう制御される一方、第２室内熱交換器（７
ｂ）の能力については、第２開度制御手段（５２）によ
り、第２電動膨張弁（ＥＶ２）の開度が過熱度Ｓｈを目
標値に収束させるよう制御される。Therefore, in the above embodiment, the pair of indoor heat exchangers (7a) and (7b) are installed in the first ventilation passage (6) formed in the casing (1) of the air conditioning unit (A). For the capacity of the first indoor heat exchanger (7a),
By the first opening control means (51), the first electric expansion valve (E
The opening E1 of V1) is controlled so that the blown air temperature Ta converges to the set temperature Ts, while the second indoor heat exchanger (7
Regarding the capability of b), the opening degree of the second electric expansion valve (EV2) is controlled by the second opening degree control means (52) so that the superheat degree Sh converges to the target value.
【００２２】ここで、図５は、吹出空気温度を制御した
ときの除湿量を示し、特に吸込空気温度が乾球温度で２
７℃、湿球温度で１９．５℃、バイパスファクタが０．
１５、第２室内熱交換器（７ｂ）出口の空気温度が乾球
温度で１２．５℃、湿球温度で１１．６℃のときのデー
タであって、第２室内熱交換器（７ｂ）側の風量比Ｆ２
の設定を０％〜８０％まで２０％ごとに変えたときのも
のである。Here, FIG. 5 shows the dehumidification amount when the blown air temperature is controlled, and in particular, the suction air temperature is 2 when the dry bulb temperature.
7 ℃, 19.5 ℃ in wet bulb temperature, bypass factor of 0.
15. The data when the air temperature at the outlet of the second indoor heat exchanger (7b) is 12.5 ° C. in the dry bulb temperature and 11.6 ° C. in the wet bulb temperature, and is the second indoor heat exchanger (7b). Side air volume ratio F2
When the setting is changed from 0% to 80% in 20% steps.
【００２３】図５において、風量比Ｆ２が１００％のと
き、つまり全ての空調空気が過熱度制御される第２室内
熱交換器（７ｂ）を通過するときには、低圧が一定に制
御されており、過熱度を目標値制御することで熱交表面
温度が露点以下になるので、除湿機能がフルに発揮さ
れ、約２．９（×１０-3kg/kg ）の除湿量が確保され
る。また、風量比Ｆ２が８０％のときには、第１電動膨
張弁（ＥＶ１）の開度が絞られるにつれて除湿量は点
（Ｏ）から点（Ｎ）（除湿量は約２．３（×１０-3kg/k
g ））まで変化し、その後は第１電動膨張弁（ＥＶ１）
の開度を絞っても除湿量は変化しない。つまり、吹出空
気温度Ｔａが１０℃から１２℃に相当する点（Ｏ）から
点（Ｎ）までの除湿量は第１室内熱交換器（７ａ）によ
る除湿量であって、吹出空気温度Ｔａが約１２℃以上で
は第１室内熱交換器（７ａ）側ではほとんど除湿機能が
発揮されないことになる。そして、吹出空気温度Ｔａが
上昇して第１電動膨張弁（ＥＶ１）が全閉になると、除
湿量は点（Ｍ）で止まり、第２室内熱交換器（７ｂ）側
の除湿量で全体の除湿量が維持される。そのとき、上記
実施例におけるステップＳＴ２４の制御のように、第１
電動膨張弁（ＥＶ１）の開度を吹出空気温度Ｔａに応じ
て制御すると、除湿量は吹出温度Ｔａの変化に応じて点
（Ｍ）から点（Ｅ）まで変化する。したがって、除湿量
は低減することになるが、後述のように吹出空気温度Ｔ
ａは維持される。In FIG. 5, when the air volume ratio F2 is 100%, that is, when all the conditioned air passes through the second indoor heat exchanger (7b) whose superheat degree is controlled, the low pressure is controlled to be constant, By controlling the superheat degree to the target value, the heat exchange surface temperature falls below the dew point, so the dehumidifying function is fully exerted and a dehumidifying amount of about 2.9 (× 10 -3 kg / kg) is secured. When the air volume ratio F2 is 80%, the dehumidification amount changes from the point (O) to the point (N) as the opening degree of the first electric expansion valve (EV1) is reduced (the dehumidification amount is approximately 2.3 (× 10 − 3 kg / k
g)) and then the first electric expansion valve (EV1)
The dehumidification amount does not change even if the opening of is reduced. That is, the dehumidification amount from the point (O) to the point (N) corresponding to the blown air temperature Ta of 10 ° C to 12 ° C is the dehumidified amount by the first indoor heat exchanger (7a), and the blown air temperature Ta is At about 12 ° C. or higher, the dehumidifying function is hardly exerted on the side of the first indoor heat exchanger (7a). Then, when the blown air temperature Ta rises and the first electric expansion valve (EV1) is fully closed, the dehumidification amount stops at the point (M), and the dehumidification amount on the second indoor heat exchanger (7b) side becomes the entire dehumidification amount. Dehumidification amount is maintained. At that time, as in the control of step ST24 in the above embodiment, the first
When the opening degree of the electric expansion valve (EV1) is controlled according to the blown air temperature Ta, the dehumidification amount changes from the point (M) to the point (E) according to the change of the blown air temperature Ta. Therefore, although the dehumidifying amount is reduced, as will be described later, the blown air temperature T
a is maintained.
【００２４】以下、風量比Ｆ２が６０％，４０％，２０
％と低下するにつれて、上記風量比Ｆ２が８０％のとき
と基本的に同じような除湿量の変化を示し、風量比Ｆ２
が６０％のときには点（Ｏ）−（Ｌ）−（Ｋ）−（Ｄ）
−（Ａ）間で、風量比Ｆ２が４０％のときには点（Ｏ）
−（Ｊ）−（Ｉ）−（Ｃ）−（Ａ）間で、風量比Ｆ２が
２０％のときには点（Ｏ）−（Ｈ）−（Ｇ）−（Ｂ）−
（Ａ）間で除湿量が変化する。また、風量比Ｆ２が０％
のとき、つまり第１室内熱交換器（７ａ）のみを使用
し、第１電動膨張弁（ＥＶ１）の開度を吹出空気温度Ｔ
ａに応じて制御する場合には、除湿量は図中の点（Ｏ）
−（Ｆ）−（Ａ）間で変化し、吹出空気温度Ｔａが約１
７℃以上では除湿量は「０」になる。すなわち、従来の
もののように、一台の室内熱交換器で吹出空気温度Ｔａ
を制御しようとすると、吹出空気温度Ｔａの制御目標値
が高い場合には除湿能力がほとんどなくなることにな
る。一方、上述のように、一台の室内熱交換器で過熱度
を制御しようとすると、除湿量は確保しうるものの吹出
空気温度Ｔａを制御目標値に維持できない。Below, the air flow rate F2 is 60%, 40%, 20
As the air volume ratio F2 decreases, the basically same change in dehumidification amount as when the air volume ratio F2 is 80% is exhibited.
Is 60%, points (O)-(L)-(K)-(D)
-(A), point (O) when the air volume ratio F2 is 40%
-(J)-(I)-(C)-(A), when the air volume ratio F2 is 20%, points (O)-(H)-(G)-(B)-
The amount of dehumidification changes between (A). Also, the air volume ratio F2 is 0%
In other words, that is, using only the first indoor heat exchanger (7a), the opening degree of the first electric expansion valve (EV1) is changed to the blown air temperature T
When controlling according to a, the dehumidification amount is the point (O) in the figure.
-(F)-(A) changes, and the blown air temperature Ta is about 1
The dehumidification amount becomes “0” at 7 ° C. or higher. That is, as in the conventional one, the blowout air temperature Ta is reduced by one indoor heat exchanger.
When the control target value of the blown air temperature Ta is high, the dehumidifying capacity is almost lost. On the other hand, as described above, if the degree of superheat is controlled by one indoor heat exchanger, the dehumidifying amount can be secured but the blown air temperature Ta cannot be maintained at the control target value.
【００２５】それに対し、上記実施例では、各室内熱交
換器（７ａ），（７ｂ）の風量が等しく設定されている
ので、除湿能力は図中の点（Ｏ）−（Ｚ）−（Ｙ）−
（Ｘ）−（Ａ）の間で変化し、吹出空気温度Ｔａの広い
範囲で大きな除湿量を確保することができる。すなわ
ち、各室内熱交換器（７ａ），（７ｂ）の能力につい
て、一方は吹出空気温度Ｔａに応じて、他方は過熱度Ｓ
ｈに応じて各電動膨張弁（ＥＶ１），（ＥＶ２）の開度
が制御されるので、吹出空気温度Ｔａを適正に維持しな
がら除湿量を確保することができ、空調の快適性を維持
することができるのである。On the other hand, in the above embodiment, since the air flow rates of the indoor heat exchangers (7a) and (7b) are set to be equal to each other, the dehumidifying capacity is represented by points (O)-(Z)-(Y in the figure. ) −
It is possible to secure a large dehumidification amount in a wide range of the blown air temperature Ta by changing between (X) and (A). That is, regarding the capacities of the indoor heat exchangers (7a) and (7b), one is in accordance with the blown air temperature Ta and the other is in the superheat degree S.
Since the opening degree of each of the electric expansion valves (EV1) and (EV2) is controlled according to h, the dehumidification amount can be secured while maintaining the blown air temperature Ta appropriately, and the comfort of air conditioning is maintained. You can do it.
【００２６】特に、上記実施例のように、吹出空気温度
Ｔａが極めて高いような条件下において、吹出空気温度
Ｔａによる開度制御を行う第１電動膨張弁（ＥＶ１）の
開度が全閉のときには、第１室内熱交換器（７ａ）の能
力は「０」であり除湿量は大きいものの、吹出空気温度
Ｔａが制御目標値から大きく外れることになる。かかる
場合、制御指標変更手段（５３）により、本来は過熱度
Ｓｈを制御指標として第２電動膨張弁（ＥＶ２）の開度
を制御する第２開度制御手段（５２）の制御指標を変更
させて、第２電動膨張弁（ＥＶ２）の開度を吹出空気温
度Ｔａを制御指標として制御することにより、除湿機能
を保持しながら室温を適正に維持することができ、よっ
て、著効を発揮することができる。In particular, as in the above embodiment, under the condition that the blown air temperature Ta is extremely high, the opening degree of the first electric expansion valve (EV1) for controlling the opened degree by the blown air temperature Ta is fully closed. At this time, although the capacity of the first indoor heat exchanger (7a) is "0" and the dehumidifying amount is large, the blown air temperature Ta largely deviates from the control target value. In such a case, the control index changing means (53) changes the control index of the second opening degree control means (52) that controls the opening degree of the second electric expansion valve (EV2) by using the superheat degree Sh as a control index. By controlling the opening degree of the second electric expansion valve (EV2) using the blown air temperature Ta as a control index, it is possible to properly maintain the room temperature while maintaining the dehumidifying function, and thus, a remarkable effect is exhibited. be able to.
【００２７】なお、上記実施例では、第１、第２室内熱
交換器（７ａ），（７ｂ）の風量をほぼ等しく設定した
が、本発明はかかる実施例に限定されるものではなく、
上記図４に示すごとく、種々の割合に設定することがで
きる。In the above embodiment, the air volumes of the first and second indoor heat exchangers (7a) and (7b) are set to be substantially equal, but the present invention is not limited to this embodiment.
As shown in FIG. 4, various ratios can be set.
【００２８】また、上記実施例では、吹出空気温度に応
じて第１電動膨張弁（ＥＶ１）の開度を制御するように
したが、本発明はかかる実施例に限定されるものではな
く、例えば吸込空気温度等を目標値にするように制御し
てもよい。Further, in the above embodiment, the opening degree of the first electric expansion valve (EV1) is controlled according to the blown air temperature, but the present invention is not limited to this embodiment. You may control so that suction air temperature etc. may become a target value.
【００２９】[0029]
【発明の効果】以上説明したように、請求項１の発明に
よれば、空調ユニット内の通風路に、一対の室内熱交換
器を互いに並列に配置するとともに、冷媒回路内で各室
内熱交換器を互いに並列に接続し、かつ両者にそれぞれ
電動膨張弁を設けておき、一方の電動膨張弁の開度を空
気温度に応じて制御する一方、他方の電動膨張弁の開度
を過熱度に応じて制御するようにしたので、室内空間の
空気温度を適正に維持しながら除湿能力を発揮すること
ができ、よって、空調の快適性の向上を図ることができ
る。As described above, according to the first aspect of the present invention, a pair of indoor heat exchangers are arranged in parallel with each other in the ventilation passage in the air conditioning unit, and each indoor heat exchange is performed in the refrigerant circuit. Are connected in parallel with each other, and both are equipped with electric expansion valves, and the opening of one electric expansion valve is controlled according to the air temperature, while the opening of the other electric expansion valve is controlled to superheat. Since it is controlled accordingly, the dehumidifying ability can be exerted while maintaining the air temperature in the indoor space appropriately, and therefore the comfort of air conditioning can be improved.
【００３０】請求項２の発明によれば、上記請求項１の
発明において、第１電動膨張弁が全閉となるときには、
第２電動膨張弁の開度を空気温度に応じて制御するよう
にしたので、室内空間の温度が極めて高いように条件下
においても、除湿機能を保持しながら空気温度を適正に
維持することができる。According to the invention of claim 2, in the invention of claim 1, when the first electric expansion valve is fully closed,
Since the opening degree of the second electric expansion valve is controlled according to the air temperature, the air temperature can be appropriately maintained while maintaining the dehumidifying function even under the condition that the temperature of the indoor space is extremely high. it can.
【図１】発明の構成を示す図である。FIG. 1 is a diagram showing a configuration of the invention.
【図２】実施例に係る空気調和装置の空調ユニットの構
成を示す縦断面図である。FIG. 2 is a vertical cross-sectional view showing a configuration of an air conditioning unit of the air conditioner according to the embodiment.
【図３】実施例における第１室内熱交換器の能力制御モ
ジュールの内容を示すフロ―チャ―ト図である。FIG. 3 is a flow chart showing the contents of the capacity control module of the first indoor heat exchanger in the embodiment.
【図４】実施例における第２室内熱交換器の能力制御モ
ジュールの内容を示すフロ―チャ―ト図である。FIG. 4 is a flowchart showing the contents of the capacity control module of the second indoor heat exchanger in the embodiment.
【図５】吹出空気温度制御時における除湿量の特性を示
す特性図である。FIG. 5 is a characteristic diagram showing a characteristic of a dehumidification amount during blowout air temperature control.
Ａ 空調ユニット １ ケーシング ６ 第１通風路 ７ａ 第１室内熱交換器 ７ｂ 第２室内熱交換器 ５０ 過熱度検出手段 ５１ 第１開度制御手段 ５２ 第２開度制御手段 ５３ 制御指標変更手段 ＥＶ１ 第１電動膨張弁 ＥＶ２ 第２電動膨張弁 Ｔｈａ 吹出温センサ（空気温度検出手段） A Air-conditioning unit 1 Casing 6 1st ventilation path 7a 1st indoor heat exchanger 7b 2nd indoor heat exchanger 50 Superheat degree detection means 51 1st opening degree control means 52 2nd opening degree control means 53 Control index change means EV1 1st 1 Electric Expansion Valve EV2 Second Electric Expansion Valve Tha Blowout Temperature Sensor (Air Temperature Detection Means)
─────────────────────────────────────────────────────
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【手続補正書】[Procedure amendment]
【提出日】平成３年１２月２６日[Submission date] December 26, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Name of item to be corrected] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【書類名】 明細書[Document name] Statement
【発明の名称】 空気調和装置の運転制御装置OPERATION CONTROL DEVICE OF AIR CONDITIONER
【特許請求の範囲】[Claims]
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明は、空気調和装置の運転制
御装置に係り、特に除湿性能及び室温制御性能の向上対
策に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner operation control device, and more particularly to measures for improving dehumidification performance and room temperature control performance.
【０００２】[0002]
【従来の技術】従来より、例えば特開昭５９―１２５３
６１号公報に開示される如く、圧縮機、室外熱交換器、
膨脹弁及び室外熱交換器を順次接続してなる冷媒回路を
備えるとともに、冷房運転時に室内熱交換器の吹出空気
を再加熱する再加熱器を設けることにより、熱交換器の
表面温度を露点以下に下げるとともに、吹出空気温度を
上昇させて、高温の吹出空気を要求されるような冷房運
転時における除湿能力の不足を補い、空調の快適性の向
上を図ろうとするものは公知の技術である。2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 59-1253.
61, a compressor, an outdoor heat exchanger,
The surface temperature of the heat exchanger is below the dew point by providing a refrigerant circuit that sequentially connects the expansion valve and the outdoor heat exchanger, and by providing a reheater that reheats the air blown from the indoor heat exchanger during cooling operation. It is a well-known technique that attempts to improve the comfort of air conditioning by increasing the temperature of the blown air and increasing the temperature of the blown air to compensate for the lack of dehumidifying ability during the cooling operation that requires high temperature blown air. ..
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来のものでは、再加熱することによりエネルギーロスを
生じるので、運転効率が悪化するとともに、システムが
複雑となり、設備コストが高く付くという問題がある。However, in the above-mentioned conventional apparatus, energy loss occurs due to reheating, so that there is a problem that operating efficiency is deteriorated, the system becomes complicated, and equipment cost increases.
【０００４】その一方、熱交温度をあまりに下げること
は吹出空気温度が過度に低下することになり、空調空間
の温度制御が無視される結果、空調の快適性が悪化する
虞れがある。On the other hand, if the heat exchange temperature is lowered too much, the temperature of the blown air will be excessively lowered, and the temperature control of the air-conditioned space will be ignored. As a result, the comfort of air conditioning may be deteriorated.
【０００５】本発明は斯かる点に鑑みてなされたもので
あり、その目的は、室内熱交換器を２つに分割し、各々
を別系統にして能力制御することにより、室内空間の空
気温度を適正に維持しながら、空調空気の除湿を行い、
もって、空調の快適性の向上を図ることにある。The present invention has been made in view of the above problems, and an object thereof is to divide the indoor heat exchanger into two parts and to control the capacity of each by making them into separate systems so that the air temperature in the indoor space can be controlled. Dehumidifying the conditioned air while maintaining
Therefore, it is to improve the comfort of air conditioning.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明の講じた手段は、図１に示すよう
に、空調ユニット（Ａ）内の通風路（６）に、一対の第
１、第２室内熱交換器（７ａ），（７ｂ）を互いに並列
に収納するとともに、冷媒回路中で上記各室内熱交換器
（７ａ），（７ｂ）を互いに並列に接続し、かつ各室内
熱交換器（７ａ），（７ｂ）ごとに第１、第２電動膨張
弁（ＥＶ１），（ＥＶ２）を設けてなる空気調和装置を
前提とする。Means for Solving the Problems To achieve the above object, the means of the present invention as set forth in claim 1 is provided with a pair of ventilation passages (6) in an air conditioning unit (A) as shown in FIG. The first and second indoor heat exchangers (7a), (7b) are housed in parallel with each other, and the indoor heat exchangers (7a), (7b) are connected in parallel with each other in the refrigerant circuit, and It is assumed that the indoor heat exchangers (7a) and (7b) are provided with the first and second electric expansion valves (EV1) and (EV2), respectively.
【０００７】そして、空気調和装置の運転制御装置とし
て、室内空間の空気温度を検出する空気温度検出手段
（Ｔｈａ）と、該空気温度検出手段（Ｔｈａ）の出力を
受け、空気温度が設定温度になるよう上記第１電動膨張
弁（ＥＶ１）の開度を制御する第１開度制御手段（５
１）と、上記第２室内熱交換器（７ｂ）出口の過熱度を
検出する過熱度検出手段（５０）と、冷房運転時、該過
熱度検出手段（５０）の出力を受け、過熱度が目標値に
なるよう上記第２電動膨張弁（ＥＶ２）の開度を制御す
る第２開度制御手段（５２）とを設ける構成としたもの
である。As an operation control device of the air conditioner, an air temperature detecting means (Tha) for detecting the air temperature of the indoor space and an output of the air temperature detecting means (Tha) are received, and the air temperature becomes a set temperature. The first opening control means (5) for controlling the opening of the first electric expansion valve (EV1) so that
1), a superheat degree detecting means (50) for detecting the superheat degree at the outlet of the second indoor heat exchanger (7b), and an output of the superheat degree detecting means (50) during the cooling operation, and the superheat degree is A second opening control means (52) for controlling the opening of the second electric expansion valve (EV2) so that the target value is achieved is provided.
【０００８】請求項２の発明の講じた手段は、図１の破
線部分に示すように、上記請求項１の発明において、冷
房運転時、第１電動膨張弁の（ＥＶ２）が全閉のときに
は、空気温度検出手段（Ｔｈａ）で検出される空気温度
に応じて第２電動膨張弁（ＥＶ２）の開度を制御するよ
う第２開度制御手段（５２）の制御指標を変更する制御
指標変更手段（５３）を設けたものである。As shown by the broken line portion in FIG. 1, the means taken by the invention of claim 2 is, in the invention of claim 1, when the first electric expansion valve (EV2) is fully closed during cooling operation. , Changing the control index of the second opening degree control means (52) so as to control the opening degree of the second electric expansion valve (EV2) according to the air temperature detected by the air temperature detecting means (Tha) Means (53) are provided.
【０００９】[0009]
【作用】以上の構成により、請求項１の発明では、空調
ユニット（Ａ）内の通風路（６）に、一対の室内熱交換
器（７ａ），（７ｂ）が設置され、第１室内熱交換器
（７ａ）の能力については、第１開度制御手段（５１）
により、第１電動膨張弁（ＥＶ１）の開度が空気温度に
応じて制御される一方、第２室内熱交換器（７ｂ）の能
力については、第２開度制御手段（５２）により、第２
電動膨張弁（ＥＶ２）の開度が過熱度に応じて制御され
る。With the above construction, in the invention of claim 1, the pair of indoor heat exchangers (7a) and (7b) are installed in the ventilation passage (6) in the air conditioning unit (A), and the first indoor heat exchanger is installed. Regarding the capacity of the exchanger (7a), the first opening control means (51)
Thus, the opening degree of the first electric expansion valve (EV1) is controlled according to the air temperature, while regarding the capacity of the second indoor heat exchanger (7b), the second opening degree control means (52) Two
The opening degree of the electric expansion valve (EV2) is controlled according to the degree of superheat.
【００１０】したがって、第２室内熱交換器（７ｂ）側
で熱交表面温度を露点以下に維持することで、空調空気
の除湿が行われる一方、第１室内熱交換器（７ａ）側で
吹出空気や吸込空気などの空気温度が制御目標値になる
よう制御され、室内空間の空気温度が適正に維持される
ことになる。Therefore, by keeping the heat exchange surface temperature below the dew point on the side of the second indoor heat exchanger (7b), dehumidification of the conditioned air is performed, while on the other hand, on the side of the first indoor heat exchanger (7a) The temperature of air such as air and suction air is controlled to reach the control target value, and the temperature of air in the indoor space is appropriately maintained.
【００１１】請求項２の発明では、室内空間の冷房負荷
が極めて小さい条件下において、空気温度による開度制
御を行う第１電動膨張弁（ＥＶ１）の開度が全閉のとき
には、第２室内熱交換器（７ｂ）側で過熱度に基づく制
御が行われると、除湿量は大きいものの室内空間の空気
温度が低下して制御目標値から大きく外れることになる
が、制御指標変更手段（５３）により第２開度制御手段
（５２）の制御指標が変更され、第２電動膨張弁（ＥＶ
２）の開度が空気温度に応じて制御されるので、かかる
条件下でも、室内空間の空気温度が適正に維持される。According to the invention of claim 2, the cooling load of the indoor space
When the opening degree of the first electric expansion valve (EV1), which controls the opening degree by the air temperature, is fully closed under a condition that is extremely small , the second indoor heat exchanger (7b) side performs control based on the degree of superheat. Then, although the dehumidification amount is large, the air temperature in the indoor space is lowered and largely deviates from the control target value. However, the control index changing means (53) changes the control index of the second opening degree control means (52). The second electric expansion valve (EV
Since the opening degree of 2) is controlled according to the air temperature, the air temperature in the indoor space can be appropriately maintained even under such conditions.
【００１２】[0012]
【実施例】以下、本発明の実施例について、図２以下の
図面に基づき説明する。Embodiments of the present invention will be described below with reference to the drawings starting from FIG.
【００１３】図２は実施例に係る空気調和装置の縦断面
構造を示し、空気調和装置の空調ユニット（Ａ）のケー
シング（１）は床面（Ｆ）上に設置され、該ケーシング
（１）内において、ケーシング（１）の下方に向かって
空調空気を送風する送風ファン（２）が配設されてお
り、ケーシング（１）の上方に開口された空気吸込口
（３）から下方の空気吹出口（５）に向かって空調空気
が流通する第１通風路（６）が形成されている。そし
て、この第１通風路（６）の上記送風ファン（２）の直
上には一対の第１，第２室内熱交換器（７ａ），（７
ｂ）が互いに並列に配設されている。また、該各室内熱
交換器（７ａ），（７ｂ）は、冷媒回路内で互いに並列
に接続されるとともに、その各々に第１，第２電動膨張
弁（ＥＶ１），（ＥＶ２）が設けられており、各電動膨
張弁（ＥＶ１），（ＥＶ２）の開度は後述のごとく個別
に制御されるようになされている。FIG. 2 shows a longitudinal sectional structure of the air conditioner according to the embodiment, in which the casing (1) of the air conditioning unit (A) of the air conditioner is installed on the floor surface (F), and the casing (1) is installed. Inside, a blower fan (2) for blowing conditioned air downwardly of the casing (1) is provided, and an air blower downward (3) is opened from an air suction port (3) opened above the casing (1). A first ventilation path (6) through which the conditioned air flows toward the outlet (5) is formed. A pair of first and second indoor heat exchangers (7a), (7) is provided directly above the blower fan (2) in the first ventilation passage (6).
b) are arranged in parallel with each other. The indoor heat exchangers (7a) and (7b) are connected in parallel with each other in the refrigerant circuit, and first and second electric expansion valves (EV1) and (EV2) are provided in each of them. The opening degree of each of the electric expansion valves (EV1) and (EV2) is individually controlled as described later.
【００１４】また、上記ケーシング（１）が設置される
床面（Ｆ）の上記空気吹出口（５）に対峙する部位には
空気流入口（９）が開口されており、さらに床面（Ｆ）
の内部には、空気流入口（９）から流入した空調空気が
流通する第２通風路（１０）が形成されていて、該第２
通風路（１０）の室内側に隣接する床面（Ｆ）の壁面に
は、必要箇所に空調空気の供給口（１１），…が設けら
れている。すなわち、空調ユニット（Ａ）のケーシング
（１）の空気吹出口（５）から吹出される空調空気を第
２通風路（１０）に流通させ、床面（Ｆ）の各部に設け
られた各供給口（１１），…から室内上方に向かって空
調空気を吹出すようにしている。Further, an air inlet (9) is opened at a portion of the floor surface (F) on which the casing (1) is installed facing the air outlet (5), and the floor surface (F) is further opened. )
A second ventilation path (10) through which the conditioned air that has flowed in from the air inlet (9) flows is formed inside the
Air-conditioning air supply ports (11), ... Are provided at required locations on the wall surface of the floor surface (F) adjacent to the indoor side of the ventilation passage (10). That is, the conditioned air blown out from the air outlet (5) of the casing (1) of the air conditioning unit (A) is circulated in the second ventilation passage (10), and each supply provided in each part of the floor surface (F). Air-conditioned air is blown upward from the mouths (11).
【００１５】そして、空気調和装置には温度センサ類が
配置されており、（Ｔｈａ）は第２通風路（１０）に配
置され、吹出空気温度Ｔａを検出する空気温度検出手段
としての吹出温センサ、（Ｔｈｒ）は室内温度Ｔｒを検
出する室温センサ、（Ｔｈｗ）は湿度を検出する湿度セ
ンサ、（Ｔｈｉ１），（Ｔｈｉ２）は、それぞれ第１、
第２室内熱交換器（７ａ），（７ｂ）の液管温度Ｔｉ
１，Ｔｉ２を検出する第１、第２液管センサ、（Ｔｇ
１），（Ｔｇ２）は、それぞれ第１、第２室内熱交換器
（７ａ），（７ｂ）のガス管温度Ｔｇ１，Ｔｇ２を検出
する第１，第２ガス管センサである。上記ガス管センサ
（Ｔｈｇ１），（Ｔｈｇ２）で検出されるガス管温度Ｔ
ｇ１，Ｔｇ２と、各液管センサ（Ｔｈｉ１），（Ｔｈｉ
２）で検出される液管温度Ｔｉ１，Ｔｉ２との温度差
（Ｔｇ１−Ｔｉ１），（Ｔｇ２−Ｔｉ２）により冷媒の
過熱度Ｓｈ１，Ｓｈ２が求められる。特に、上記第２ガ
ス管センサ（Ｔｈｇ２）及び第２液管センサ（Ｔｈｉ
２）により、本発明にいう過熱度検出手段（５０）が構
成されている。Further, temperature sensors are arranged in the air conditioner, (Tha) is arranged in the second ventilation passage (10), and an outlet temperature sensor as an air temperature detecting means for detecting the outlet air temperature Ta. , (Thr) are room temperature sensors that detect the room temperature Tr, (Thw) are humidity sensors that detect humidity, and (Thi1) and (Thi2) are the first and
Liquid pipe temperature Ti of the second indoor heat exchangers (7a), (7b)
1st and 2nd liquid pipe sensor which detects 1 and Ti2, (Tg
1) and (Tg2) are first and second gas pipe sensors for detecting the gas pipe temperatures Tg1 and Tg2 of the first and second indoor heat exchangers (7a) and (7b), respectively. Gas pipe temperature T detected by the gas pipe sensors (Thg1) and (Thg2)
g1, Tg2 and each liquid pipe sensor (Thi1), (Thi
The superheats Sh1, Sh2 of the refrigerant are obtained from the temperature differences (Tg1-Ti1), (Tg2-Ti2) from the liquid pipe temperatures Ti1, Ti2 detected in 2). In particular, the second gas pipe sensor (Thg2) and the second liquid pipe sensor (Thi)
2) constitutes the superheat detecting means (50) according to the present invention.
【００１６】そして、上記各センサは空気調和装置のコ
ントローラ（２０）に信号線で接続されており、該コン
トローラ（２０）により、上記各センサの信号に応じて
空気調和装置の運転を制御するようになされている。特
に、第１室内熱交換器（７ａ）側では、その能力を調節
する第１電動膨張弁（ＥＶ１）の開度Ｅ１は主として吹
出空気温度Ｔａに応じ、第２電動膨張弁（ＥＶ２）の開
度Ｅ２は主として過熱度Ｓｈ２に応じて制御されるよう
になされている。以下、各電動膨張弁（ＥＶ１），（Ｅ
Ｖ２）の開度制御の内容について、図３及び図４のフロ
―チャ―トに基づき説明する。Each sensor is connected to a controller (20) of the air conditioner by a signal line, and the controller (20) controls the operation of the air conditioner according to the signal of each sensor. Has been done. In particular, on the side of the first indoor heat exchanger (7a), the opening degree E1 of the first electric expansion valve (EV1) for adjusting its capacity mainly depends on the blown air temperature Ta and the opening degree of the second electric expansion valve (EV2). The degree E2 is mainly controlled according to the degree of superheat Sh2. Hereinafter, each electric expansion valve (EV1), (E
The contents of the opening degree control of V2) will be described based on the flowcharts of FIGS. 3 and 4.
【００１７】図３は、冷房運転時における第１室内熱交
換器（７ａ）の能力制御モジュールＳＴ１Ｍを示し、ま
ず、ステップＳＴ１１で、第１電動膨張弁（ＥＶ１）の
開度Ｅ１を制御するための変数について、現在値Ｅｓ１
を前回値Ｅｃ１とする変数の更新を行った後、ステップ
ＳＴ１２で、上記吹出温センサ（Ｔｈａ）の検出値Ｔａ
から、Ｅｓ１＝Ｔａ−Ｔｓ（ただし、Ｔｓは吹出空気温
度Ｔａの制御目標値）として、新しい変数の現在値Ｅｓ
１を求める。そして、ステップＳＴ１３で、変数値Ｅｓ
１と不感帯幅ΔＴｄ１（例えば０．５℃程度の温度幅）
とを比較し、｜Ｅｓ１｜＜ΔＴｄ１でなければ、ステッ
プＳＴ１４で、下記式（１） ΔＥ１＝Ｋc1｛（Ｅs1−Ｅc1）＋（Δｔs1／２Ｔi1）（Ｅs1＋Ｅc1）｝ (1) （ただし、Ｋc はゲイン、Ｔi は積分時間、Δｔs はサ
ンプリング時間であって、後述の(2) 式においても添字
は異なるが同様である）に基づき第１電動膨張弁（ＥＶ
１）の開度変更値ΔＥ１を演算する一方、｜Ｅｓ１｜＜
ΔＴｄ１であれば、現在の開度を変更する必要はないと
判断して、ステップＳＴ１５で、ΔＥ１＝０とする。そ
して、ステップＳＴ１６で、第１電動膨張弁（ＥＶ１）
の新開度Ｅ１について、Ｅ１＝Ｅ１＋ΔＥ１とし、第１
室内熱交換器（７ａ）の能力制御モジュールを終了す
る。FIG. 3 shows the capacity control module ST1M of the first indoor heat exchanger (7a) during the cooling operation. First, in step ST11, the opening E1 of the first electric expansion valve (EV1) is controlled. Current value Es1 for the variable
Is updated to the previous value Ec1 and then, in step ST12, the detected value Ta of the blow-out temperature sensor (Tha) is detected.
Therefore, as Es1 = Ta−Ts (where Ts is the control target value of the blown air temperature Ta), the current value Es of the new variable is set.
Ask for 1. Then, in step ST13, the variable value Es
1 and dead band width ΔTd1 (for example, a temperature width of about 0.5 ° C.)
If it is not | Es1 | <ΔTd1, the following equation (1) ΔE1 = Kc1 {(Es1−Ec1) + (Δts1 / 2Ti1) (Es1 + Ec1)} (1) (where Kc is The gain, Ti is the integration time, and Δts is the sampling time. The same applies although the subscripts are different even in the equation (2) described later).
While the opening change value ΔE1 in 1) is calculated, | Es1 | <
If ΔTd1, it is determined that it is not necessary to change the current opening degree, and ΔE1 = 0 is set in step ST15. Then, in step ST16, the first electric expansion valve (EV1)
The new opening E1 of E1 = E1 + ΔE1
The capacity control module of the indoor heat exchanger (7a) is terminated.
【００１８】次に、図４は、第２室内熱交換器（７ｂ）
の能力制御モジュールＳＴ２Ｍを示し、まず、ステップ
ＳＴ２１で、第２電動膨張弁（ＥＶ２）の開度を制御す
るための変数について、現在値Ｅｓ２を前回値Ｅｃ２と
する変数の更新を行った後、ステップＳＴ２２で、上記
第２液管センサ（Ｔｈｉ２）及び第２ガス管センサ（Ｔ
ｈｇ２）の検出値Ｔｉ２，Ｔｇ２から、Ｅｓ２＝Ｔｇ２
−Ｔｉ２（つまり、過熱度）として、新しい変数の現在
値Ｅｓ２を求める。そして、ステップＳＴ２３で、第１
電動膨張弁（ＥＶ１）の開度Ｅ１が「０」か否かを判別
し、Ｅ１＝０であれば、第１室内熱交換器（７ａ）側の
能力が「０」であるため、吹出空気温度Ｔａを優先的に
制御すべく、ステップＳＴ２４で、上記式（１）を利用
し、Ｅ１の変わりにＥ２を代入して第２電動膨張弁（Ｅ
Ｖ２）の開度Ｅ２を演算する。Next, FIG. 4 shows the second indoor heat exchanger (7b).
Of the capacity control module ST2M, first, in step ST21, for variables for controlling the opening degree of the second electric expansion valve (EV2), after updating the variables whose current value Es2 is the previous value Ec2, In step ST22, the second liquid pipe sensor (Thi2) and the second gas pipe sensor (T2).
From the detected values Ti2 and Tg2 of hg2), Es2 = Tg2
The current value Es2 of a new variable is obtained as −Ti2 (that is, the degree of superheat). Then, in step ST23, the first
It is determined whether or not the opening degree E1 of the electric expansion valve (EV1) is "0". If E1 = 0, the capacity on the first indoor heat exchanger (7a) side is "0", so the blown air In order to control the temperature Ta preferentially, in step ST24, the above formula (1) is used, E2 is substituted for E1, and the second electric expansion valve (E
The opening E2 of V2) is calculated.
【００１９】次に、ステップＳＴ２５で、変数値Ｅｓ２
と目標過熱度Ｓhsとの差の絶対値｜Ｅs2−Ｓhs｜を不感
帯幅ΔＴｄ２（例えば０．５℃程度の温度幅）と比較
し、｜Ｅｓ２−Ｓhs｜＜ΔＴｄ２でなければ、ステップ
ＳＴ２７で、下記式（２） ΔＥ２＝Ｋc2｛（Ｅs2−Ｅc2）＋（Δｔs2／２Ｔi2）（Ｅs2＋Ｅc2）｝ (2) に基づき第２電動膨張弁（ＥＶ２）の開度変更値ΔＥ２
を演算する一方、｜Ｅｓ２−Ｓhs｜＜ΔＴｄ２であれ
ば、現在の開度を変更する必要はないと判断して、ステ
ップＳＴ２６で、ΔＥ２＝０とする。そして、ステップ
ＳＴ２８で、第２電動膨張弁（ＥＶ２）の新開度Ｅ２に
ついて、Ｅ２＝Ｅ２＋ΔＥ２とし、第２室内熱交換器
（７ｂ）の能力制御モジュールを終了する。Next, in step ST25, the variable value Es2
Is insensitive to the absolute value of the difference between the target superheat degree Shs and Es2-Shs |
Compare with the band width ΔTd2 (for example, temperature range of about 0.5 ° C)
And if not | Es2-Shs | <ΔTd2, step
In ST27, the opening change value ΔE2 of the second electric expansion valve (EV2) is calculated based on the following equation (2) ΔE2 = Kc2 {(Es2-Ec2) + (Δts2 / 2Ti2) (Es2 + Ec2)} (2).
On the other hand, if | Es2-Shs | <[Delta] Td2, it is determined that it is not necessary to change the current opening degree, and in step ST26 , [Delta] E2 = 0 is set. Then, in step ST28, the new opening E2 of the second electric expansion valve (EV2) is set to E2 = E2 + ΔE2, and the capacity control module of the second indoor heat exchanger (7b) is terminated.
【００２０】上記フローにおいて、ステップＳＴ１４及
びＳＴ１６の制御により、本発明にいう第１開度制御手
段（５１）が構成され、ステップＳＴ２６及びＳＴ２８
の制御により、本発明にいう第２開度制御手段（５２）
が構成されている。また、ステップＳＴ２４及びＳＴ２
８の制御により、請求項２の発明にいう制御指標変更手
段（５３）が構成されている。In the above flow, the first opening control means (51) according to the present invention is constituted by the control of steps ST14 and ST16, and steps ST26 and ST28.
By controlling the second opening control means (52) according to the present invention.
Is configured. Also, steps ST24 and ST2
By the control of 8, the control index changing means (53) according to the invention of claim 2 is constituted.
【００２１】したがって、上記実施例では、空調ユニッ
ト（Ａ）のケーシング（１）内に形成される第１通風路
（６）に、一対の室内熱交換器（７ａ），（７ｂ）が設
置され、第１室内熱交換器（７ａ）の能力については、
第１開度制御手段（５１）により、第１電動膨張弁（Ｅ
Ｖ１）の開度Ｅ１が吹出空気温度Ｔａを設定温度Ｔｓに
収束させるよう制御される一方、第２室内熱交換器（７
ｂ）の能力については、第２開度制御手段（５２）によ
り、第２電動膨張弁（ＥＶ２）の開度が過熱度Ｓｈを目
標値に収束させるよう制御される。Therefore, in the above embodiment, the pair of indoor heat exchangers (7a) and (7b) are installed in the first ventilation passage (6) formed in the casing (1) of the air conditioning unit (A). For the capacity of the first indoor heat exchanger (7a),
By the first opening control means (51), the first electric expansion valve (E
The opening E1 of V1) is controlled so that the blown air temperature Ta converges to the set temperature Ts, while the second indoor heat exchanger (7
Regarding the capability of b), the opening degree of the second electric expansion valve (EV2) is controlled by the second opening degree control means (52) so that the superheat degree Sh converges to the target value.
【００２２】ここで、図５は、吹出空気温度を制御した
ときの除湿量を示し、特に吸込空気温度が乾球温度で２
７℃、湿球温度で１９．５℃、バイパスファクタが０．
１５、第２室内熱交換器（７ｂ）出口の空気温度が乾球
温度で１２．５℃、湿球温度で１１．６℃のときのデー
タであって、第２室内熱交換器（７ｂ）側の風量比Ｆ２
の設定を０％〜８０％まで２０％ごとに変えたときのも
のである。Here, FIG. 5 shows the dehumidification amount when the blown air temperature is controlled, and in particular, the suction air temperature is 2 when the dry bulb temperature.
7 ℃, 19.5 ℃ in wet bulb temperature, bypass factor of 0.
15. The data when the air temperature at the outlet of the second indoor heat exchanger (7b) is 12.5 ° C. in the dry bulb temperature and 11.6 ° C. in the wet bulb temperature, and is the second indoor heat exchanger (7b). Side air volume ratio F2
When the setting is changed from 0% to 80% in 20% steps.
【００２３】図５において、風量比Ｆ２が１００％のと
き、つまり全ての空調空気が過熱度制御される第２室内
熱交換器（７ｂ）を通過するときには、低圧が一定に制
御されており、過熱度を目標値制御することで熱交表面
温度が露点以下になるので、除湿機能がフルに発揮さ
れ、約２．９（×１０-3kg/kg ）の除湿量が確保され
る。また、風量比Ｆ２が８０％のときには、第１電動膨
張弁（ＥＶ１）の開度が絞られるにつれて除湿量は点
（Ｏ）から点（Ｎ）（除湿量は約２．３（×１０-3kg/k
g ））まで変化し、その後は第１電動膨張弁（ＥＶ１）
の開度を絞っても除湿量は変化しない。つまり、吹出空
気温度Ｔａが１３℃から１４℃に相当する点（Ｏ）から
点（Ｎ）までの除湿量は第１室内熱交換器（７ａ）によ
る除湿量であって、吹出空気温度Ｔａが約１４℃以上で
は第１室内熱交換器（７ａ）側ではほとんど除湿機能が
発揮されないことになる。そして、吹出空気温度Ｔａが
上昇して第１電動膨張弁（ＥＶ１）が全閉になると、除
湿量は点（Ｍ）で止まり、第２室内熱交換器（７ｂ）側
の除湿量で全体の除湿量が維持される。そのとき、上記
実施例におけるステップＳＴ２４の制御のように、第１
電動膨張弁（ＥＶ１）の開度を吹出空気温度Ｔａに応じ
て制御すると、除湿量は吹出温度Ｔａの変化に応じて点
（Ｍ）から点（Ｅ）まで変化する。したがって、除湿量
は低減することになるが、後述のように吹出空気温度Ｔ
ａは維持される。In FIG. 5, when the air volume ratio F2 is 100%, that is, when all the conditioned air passes through the second indoor heat exchanger (7b) whose superheat degree is controlled, the low pressure is controlled to be constant, By controlling the superheat degree to the target value, the heat exchange surface temperature falls below the dew point, so the dehumidifying function is fully exerted and a dehumidifying amount of about 2.9 (× 10 -3 kg / kg) is secured. When the air volume ratio F2 is 80%, the dehumidification amount changes from the point (O) to the point (N) as the opening degree of the first electric expansion valve (EV1) is reduced (the dehumidification amount is approximately 2.3 (× 10 − 3 kg / k
g)) and then the first electric expansion valve (EV1)
The dehumidification amount does not change even if the opening of is reduced. That is, the dehumidifying amount from the point (O) to the point (N) corresponding to the blown air temperature Ta of 13 ° C to 14 ° C is the dehumidified amount by the first indoor heat exchanger (7a), and the blown air temperature Ta is At about 14 ° C. or higher , the dehumidifying function is hardly exerted on the side of the first indoor heat exchanger (7a). Then, when the blown air temperature Ta rises and the first electric expansion valve (EV1) is fully closed, the dehumidification amount stops at the point (M), and the dehumidification amount on the second indoor heat exchanger (7b) side becomes the entire dehumidification amount. Dehumidification amount is maintained. At that time, as in the control of step ST24 in the above embodiment, the first
When the opening degree of the electric expansion valve (EV1) is controlled according to the blown air temperature Ta, the dehumidification amount changes from the point (M) to the point (E) according to the change of the blown air temperature Ta. Therefore, although the dehumidifying amount is reduced, as will be described later, the blown air temperature T
a is maintained.
【００２４】以下、風量比Ｆ２が６０％，４０％，２０
％と低下するにつれて、上記風量比Ｆ２が８０％のとき
と基本的に同じような除湿量の変化を示し、風量比Ｆ２
が６０％のときには点（Ｏ）−（Ｌ）−（Ｋ）−（Ｄ）
−（Ａ）間で、風量比Ｆ２が４０％のときには点（Ｏ）
−（Ｊ）−（Ｉ）−（Ｃ）−（Ａ）間で、風量比Ｆ２が
２０％のときには点（Ｏ）−（Ｈ）−（Ｇ）−（Ｂ）−
（Ａ）間で除湿量が変化する。また、風量比Ｆ２が０％
のとき、つまり第１室内熱交換器（７ａ）のみを使用
し、第１電動膨張弁（ＥＶ１）の開度を吹出空気温度Ｔ
ａに応じて制御する場合には、除湿量は図中の点（Ｏ）
−（Ｆ）−（Ａ）間で変化し、吹出空気温度Ｔａが約１
７℃以上では除湿量は「０」になる。すなわち、従来の
もののように、一台の室内熱交換器で吹出空気温度Ｔａ
を制御しようとすると、吹出空気温度Ｔａの制御目標値
が高い場合には除湿能力がほとんどなくなることにな
る。一方、上述のように、一台の室内熱交換器で過熱度
を制御しようとすると、除湿量は確保しうるものの吹出
空気温度Ｔａを制御目標値に維持できない。Below, the air flow rate F2 is 60%, 40%, 20
As the air volume ratio F2 decreases, the basically same change in dehumidification amount as when the air volume ratio F2 is 80% is exhibited.
Is 60%, points (O)-(L)-(K)-(D)
-(A), point (O) when the air volume ratio F2 is 40%
-(J)-(I)-(C)-(A), when the air volume ratio F2 is 20%, points (O)-(H)-(G)-(B)-
The amount of dehumidification changes between (A). Also, the air volume ratio F2 is 0%
In other words, that is, using only the first indoor heat exchanger (7a), the opening degree of the first electric expansion valve (EV1) is changed to the blown air temperature T
When controlling according to a, the dehumidification amount is the point (O) in the figure.
-(F)-(A) changes, and blown air temperature Ta is about 1
The dehumidification amount becomes "0" at 7 ° C or higher. That is, as in the conventional one, the blowout air temperature Ta is reduced by one indoor heat exchanger.
When the control target value of the blown air temperature Ta is high, the dehumidifying capacity is almost lost. On the other hand, as described above, if the degree of superheat is controlled by one indoor heat exchanger, the dehumidifying amount can be secured but the blown air temperature Ta cannot be maintained at the control target value.
【００２５】それに対し、上記実施例では、各室内熱交
換器（７ａ），（７ｂ）の風量が等しく設定されている
ので、除湿能力は図中の点（Ｏ）−（Ｚ）−（Ｙ）−
（Ｘ）−（Ａ）の間で変化し、吹出空気温度Ｔａの広い
範囲で大きな除湿量を確保することができる。すなわ
ち、各室内熱交換器（７ａ），（７ｂ）の能力につい
て、一方は吹出空気温度Ｔａに応じて、他方は過熱度Ｓ
ｈに応じて各電動膨張弁（ＥＶ１），（ＥＶ２）の開度
が制御されるので、吹出空気温度Ｔａを適正に維持しな
がら除湿量を確保することができ、空調の快適性を維持
することができるのである。On the other hand, in the above embodiment, since the air flow rates of the indoor heat exchangers (7a) and (7b) are set to be equal to each other, the dehumidifying capacity is represented by points (O)-(Z)-(Y in the figure. ) −
It is possible to secure a large dehumidification amount in a wide range of the blown air temperature Ta by changing between (X) and (A). That is, regarding the capacities of the indoor heat exchangers (7a) and (7b), one is in accordance with the blown air temperature Ta and the other is in the superheat degree S.
Since the opening degree of each of the electric expansion valves (EV1) and (EV2) is controlled according to h, the dehumidification amount can be secured while maintaining the blown air temperature Ta appropriately, and the comfort of air conditioning is maintained. You can do it.
【００２６】特に、上記実施例のように、吹出空気温度
Ｔａが極めて高いような条件下において、吹出空気温度
Ｔａによる開度制御を行う第１電動膨張弁（ＥＶ１）の
開度が全閉のときには、第１室内熱交換器（７ａ）の能
力は「０」であり除湿量は大きいものの、吹出空気温度
Ｔａが制御目標値から大きく外れることになる。かかる
場合、制御指標変更手段（５３）により、本来は過熱度
Ｓｈを制御指標として第２電動膨張弁（ＥＶ２）の開度
を制御する第２開度制御手段（５２）の制御指標を変更
させて、第２電動膨張弁（ＥＶ２）の開度を吹出空気温
度Ｔａを制御指標として制御することにより、除湿機能
を保持しながら室温を適正に維持することができ、よっ
て、著効を発揮することができる。In particular, as in the above embodiment, under the condition that the blown air temperature Ta is extremely high, the opening degree of the first electric expansion valve (EV1) for controlling the opened degree by the blown air temperature Ta is fully closed. At this time, although the capacity of the first indoor heat exchanger (7a) is "0" and the dehumidifying amount is large, the blown air temperature Ta largely deviates from the control target value. In such a case, the control index changing means (53) changes the control index of the second opening degree control means (52) that controls the opening degree of the second electric expansion valve (EV2) by using the superheat degree Sh as a control index. By controlling the opening degree of the second electric expansion valve (EV2) using the blown air temperature Ta as a control index, it is possible to properly maintain the room temperature while maintaining the dehumidifying function, and thus, a remarkable effect is exhibited. be able to.
【００２７】なお、上記実施例では、第１、第２室内熱
交換器（７ａ），（７ｂ）の風量をほぼ等しく設定した
が、本発明はかかる実施例に限定されるものではなく、
上記図４に示すごとく、種々の割合に設定することがで
きる。In the above embodiment, the air volumes of the first and second indoor heat exchangers (7a) and (7b) are set to be substantially equal, but the present invention is not limited to this embodiment.
As shown in FIG. 4, various ratios can be set.
【００２８】また、上記実施例では、吹出空気温度に応
じて第１電動膨張弁（ＥＶ１）の開度を制御するように
したが、本発明はかかる実施例に限定されるものではな
く、例えば吸込空気温度等を目標値にするように制御し
てもよい。Further, in the above embodiment, the opening degree of the first electric expansion valve (EV1) is controlled according to the blown air temperature, but the present invention is not limited to this embodiment. You may control so that suction air temperature etc. may become a target value.
【００２９】[0029]
【発明の効果】以上説明したように、請求項１の発明に
よれば、空調ユニット内の通風路に、一対の室内熱交換
器を互いに並列に配置するとともに、冷媒回路内で各室
内熱交換器を互いに並列に接続し、かつ両者にそれぞれ
電動膨張弁を設けておき、一方の電動膨張弁の開度を空
気温度に応じて制御する一方、他方の電動膨張弁の開度
を過熱度に応じて制御するようにしたので、室内空間の
空気温度を適正に維持しながら除湿能力を発揮すること
ができ、よって、空調の快適性の向上を図ることができ
る。As described above, according to the first aspect of the present invention, a pair of indoor heat exchangers are arranged in parallel with each other in the ventilation passage in the air conditioning unit, and each indoor heat exchange is performed in the refrigerant circuit. Are connected in parallel with each other, and both are equipped with electric expansion valves, and the opening of one electric expansion valve is controlled according to the air temperature, while the opening of the other electric expansion valve is controlled to superheat. Since it is controlled accordingly, the dehumidifying ability can be exerted while maintaining the air temperature in the indoor space appropriately, and therefore the comfort of air conditioning can be improved.
【００３０】請求項２の発明によれば、上記請求項１の
発明において、第１電動膨張弁が全閉となるときには、
第２電動膨張弁の開度を空気温度に応じて制御するよう
にしたので、室内空間の温度が極めて高いように条件下
においても、除湿機能を保持しながら空気温度を適正に
維持することができる。According to the invention of claim 2, in the invention of claim 1, when the first electric expansion valve is fully closed,
Since the opening degree of the second electric expansion valve is controlled according to the air temperature, the air temperature can be appropriately maintained while maintaining the dehumidifying function even under the condition that the temperature of the indoor space is extremely high. it can.
【図面の簡単な説明】[Brief description of drawings]
【図１】発明の構成を示す図である。FIG. 1 is a diagram showing a configuration of the invention.
【図２】実施例に係る空気調和装置の空調ユニットの構
成を示す縦断面図である。FIG. 2 is a vertical cross-sectional view showing a configuration of an air conditioning unit of the air conditioner according to the embodiment.
【図３】実施例における第１室内熱交換器の能力制御モ
ジュールの内容を示すフロ―チャ―ト図である。FIG. 3 is a flow chart showing the contents of the capacity control module of the first indoor heat exchanger in the embodiment.
【図４】実施例における第２室内熱交換器の能力制御モ
ジュールの内容を示すフロ―チャ―ト図である。FIG. 4 is a flowchart showing the contents of the capacity control module of the second indoor heat exchanger in the embodiment.
【図５】吹出空気温度制御時における除湿量の特性を示
す特性図である。FIG. 5 is a characteristic diagram showing a characteristic of a dehumidification amount during blowout air temperature control.
【符号の説明】 Ａ 空調ユニット １ ケーシング ６ 第１通風路 ７ａ 第１室内熱交換器 ７ｂ 第２室内熱交換器 ５０ 過熱度検出手段 ５１ 第１開度制御手段 ５２ 第２開度制御手段 ５３ 制御指標変更手段 ＥＶ１ 第１電動膨張弁 ＥＶ２ 第２電動膨張弁 Ｔｈａ 吹出温センサ（空気温度検出手段）[Explanation of Codes] A Air-conditioning unit 1 Casing 6 First ventilation passage 7a First indoor heat exchanger 7b Second indoor heat exchanger 50 Superheat detection means 51 First opening control means 52 Second opening control means 53 Control Index changing means EV1 first electric expansion valve EV2 second electric expansion valve Tha blow-out temperature sensor (air temperature detecting means)
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図３[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図３】 [Figure 3]
【手続補正３】[Procedure 3]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図４[Name of item to be corrected] Fig. 4
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図４】 [Figure 4]
【手続補正４】[Procedure amendment 4]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図５[Name of item to be corrected] Figure 5
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図５】 [Figure 5]
Claims (2)
に、一対の第１、第２室内熱交換器（７ａ），（７ｂ）
を互いに並列に収納するとともに、冷媒回路中で上記各
室内熱交換器（７ａ），（７ｂ）を互いに並列に接続
し、かつ各室内熱交換器（７ａ），（７ｂ）ごとに第
１、第２電動膨張弁（ＥＶ１），（ＥＶ２）を設けてな
る空気調和装置において、 室内空間の空気温度を検出する空気温度検出手段（Ｔｈ
ａ）と、該空気温度検出手段（Ｔｈａ）の出力を受け、
空気温度が設定温度になるよう上記第１電動膨張弁（Ｅ
Ｖ１）の開度を制御する第１開度制御手段（５１）と、
上記第２室内熱交換器（７ｂ）出口の過熱度を検出する
過熱度検出手段（５０）と、冷房運転時、該過熱度検出
手段（５０）の出力を受け、過熱度が目標値になるよう
上記第２電動膨張弁（ＥＶ２）の開度を制御する第２開
度制御手段（５２）とを備えたことを特徴とする空気調
和装置の運転制御装置。1. A ventilation path (6) in an air conditioning unit (A).
And a pair of first and second indoor heat exchangers (7a), (7b)
Are stored in parallel with each other, the indoor heat exchangers (7a), (7b) are connected in parallel with each other in the refrigerant circuit, and the indoor heat exchangers (7a), (7b) each have the first, In an air conditioner provided with second electric expansion valves (EV1), (EV2), an air temperature detecting means (Th) for detecting an air temperature in an indoor space.
a) and the output of the air temperature detecting means (Tha),
The first electric expansion valve (E
A first opening control means (51) for controlling the opening of V1),
The superheat degree detecting means (50) for detecting the superheat degree at the outlet of the second indoor heat exchanger (7b) and the output of the superheat degree detecting means (50) during the cooling operation receive the superheat degree to a target value. And a second opening control means (52) for controlling the opening of the second electric expansion valve (EV2).
には、空気温度検出手段（Ｔｈａ）で検出される空気温
度に応じて第２電動膨張弁（ＥＶ２）の開度を制御する
よう第２開度制御手段（５２）の制御指標を変更する制
御指標変更手段（５３）を備えたことを特徴とする空気
調和装置の運転制御装置。2. The air conditioner according to claim 1, wherein during cooling operation, when the (EV2) of the first electric expansion valve is fully closed, the air temperature is detected according to the air temperature detected by the air temperature detecting means (Tha). Operation of an air conditioner characterized by comprising control index changing means (53) for changing the control index of the second opening degree control means (52) so as to control the opening degree of the second electric expansion valve (EV2). Control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3231886A JP2701612B2 (en) | 1991-09-11 | 1991-09-11 | Operation control device for air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3231886A JP2701612B2 (en) | 1991-09-11 | 1991-09-11 | Operation control device for air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0571815A true JPH0571815A (en) | 1993-03-23 |
| JP2701612B2 JP2701612B2 (en) | 1998-01-21 |
Family
ID=16930573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3231886A Expired - Lifetime JP2701612B2 (en) | 1991-09-11 | 1991-09-11 | Operation control device for air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2701612B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007107815A (en) * | 2005-10-13 | 2007-04-26 | Hoshizaki Electric Co Ltd | Cooling storage and operation method thereof |
| JP2009287834A (en) * | 2008-05-29 | 2009-12-10 | Kiyotomo Tanaka | Heat exchanger |
| JP2012067944A (en) * | 2010-09-22 | 2012-04-05 | Ntt Facilities Inc | Method of controlling indoor unit blowout temperature of air conditioner |
| US8209991B2 (en) | 2007-03-13 | 2012-07-03 | Hoshizaki Denki Kabushiki Kaisha | Cooling storage and method of operating the same |
| CN109237672A (en) * | 2018-08-22 | 2019-01-18 | 青岛海尔空调电子有限公司 | Air conditioner and control method for air conditioner |
| CN113639443A (en) * | 2021-08-20 | 2021-11-12 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5423540A (en) * | 1977-07-22 | 1979-02-22 | Kopia Kk | Paper supplying casette |
-
1991
- 1991-09-11 JP JP3231886A patent/JP2701612B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5423540A (en) * | 1977-07-22 | 1979-02-22 | Kopia Kk | Paper supplying casette |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007107815A (en) * | 2005-10-13 | 2007-04-26 | Hoshizaki Electric Co Ltd | Cooling storage and operation method thereof |
| US8209991B2 (en) | 2007-03-13 | 2012-07-03 | Hoshizaki Denki Kabushiki Kaisha | Cooling storage and method of operating the same |
| JP2009287834A (en) * | 2008-05-29 | 2009-12-10 | Kiyotomo Tanaka | Heat exchanger |
| JP2012067944A (en) * | 2010-09-22 | 2012-04-05 | Ntt Facilities Inc | Method of controlling indoor unit blowout temperature of air conditioner |
| CN109237672A (en) * | 2018-08-22 | 2019-01-18 | 青岛海尔空调电子有限公司 | Air conditioner and control method for air conditioner |
| CN109237672B (en) * | 2018-08-22 | 2021-06-22 | 青岛海尔空调电子有限公司 | Air conditioner and control method therefor |
| CN113639443A (en) * | 2021-08-20 | 2021-11-12 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2701612B2 (en) | 1998-01-21 |
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