JPH10318557A - Refrigerant circulation type air conditioning system - Google Patents
Refrigerant circulation type air conditioning systemInfo
- Publication number
- JPH10318557A JPH10318557A JP9131001A JP13100197A JPH10318557A JP H10318557 A JPH10318557 A JP H10318557A JP 9131001 A JP9131001 A JP 9131001A JP 13100197 A JP13100197 A JP 13100197A JP H10318557 A JPH10318557 A JP H10318557A
- Authority
- JP
- Japan
- Prior art keywords
- refrigerant
- heat exchanger
- fan coil
- temperature
- coil unit
- 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.)
- Pending
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
(57)【要約】
【課題】 冷房時で部分負荷時に冷媒の循環を阻害しな
いようにできる冷媒循環式空調システムを提供する。
【解決手段】 冷房時には室外機の熱交換器１内の冷媒
液を複数のファンコイルユニット２に重力の作用と気化
した冷媒ガスの圧力により主に自然循環させることによ
り各部屋を冷房し、暖房時には室外機の熱交換器１で気
化した冷媒ガスを、そのガスの圧力とポンプ３によりフ
ァンコイルユニット２に循環させることにより各部屋を
暖房する冷媒循環式空調システムである。これににおい
て、冷房時にファンコイルユニット２の冷媒入口側の冷
媒液の温度を測定し、この入口側の冷媒液の温度がある
複数段階の夫々の設定温度以上になったときその温度に
応じてファンコイルユニット２の熱交換器へ冷媒液を流
すための膨張弁７の開度を夫々複数段階に制御するコン
トローラー９を設ける。
(57) [Problem] To provide a refrigerant circulating air conditioning system capable of preventing the circulation of the refrigerant from being hindered at the time of partial load during cooling. SOLUTION: At the time of cooling, each room is cooled and heated by mainly circulating a refrigerant liquid in a heat exchanger 1 of an outdoor unit to a plurality of fan coil units 2 mainly by the action of gravity and the pressure of vaporized refrigerant gas. Sometimes, a refrigerant circulation air conditioning system that heats each room by circulating the refrigerant gas vaporized in the heat exchanger 1 of the outdoor unit to the fan coil unit 2 by the pressure of the gas and the pump 3. In this, the temperature of the refrigerant liquid on the refrigerant inlet side of the fan coil unit 2 is measured at the time of cooling, and when the temperature of the refrigerant liquid on the inlet side exceeds a certain set temperature in a plurality of stages, the temperature is determined according to the temperature. A controller 9 for controlling the opening of the expansion valve 7 for flowing the refrigerant liquid to the heat exchanger of the fan coil unit 2 in a plurality of stages is provided.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、冷媒の搬送管を共
用して多層階の建物の冷暖房を行う冷媒循環式空調シス
テムにおいて、冷房時に停止中のファンコイルユニット
による冷媒の停滞が生じるのを防止しようとする冷媒循
環式空調システムに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant circulation type air-conditioning system for cooling and heating a multi-story building by sharing a refrigerant transfer pipe. The present invention relates to a refrigerant circulation type air conditioning system to be prevented.
【０００２】[0002]
【従来の技術】従来から、図３に示す如く、建物の上部
位置に室外機の熱交換器１を設置し、同熱交換器１と建
物内の各部屋に設置のファンコイルユニット２との間を
冷媒の搬送管で連結して冷媒が循環する閉回路を構成
し、冷房時には室外機の熱交換器１内の冷媒液を複数の
ファンコイルユニット２に重力の作用と気化した冷媒の
圧力により自然循環させることにより各部屋を冷房し、
暖房時には室外機の熱交換器１で気化した冷媒ガスを、
その圧力と液化した冷媒液を熱交換器１に戻すための建
物の下部位置に設けたポンプ３によってファンコイルユ
ニット２に循環させることにより各部屋を暖房するよう
にした冷媒循環式空調システムがある。図３で５は冷媒
液搬送管、６は冷媒ガス搬送管、７は膨張弁、８は受液
器である。2. Description of the Related Art Conventionally, as shown in FIG. 3, a heat exchanger 1 of an outdoor unit is installed at an upper position of a building, and the heat exchanger 1 is connected to a fan coil unit 2 installed in each room in the building. The cooling medium is connected by a refrigerant transfer pipe to form a closed circuit in which the refrigerant circulates. During cooling, the refrigerant liquid in the heat exchanger 1 of the outdoor unit is applied to the plurality of fan coil units 2 by the action of gravity and the pressure of the vaporized refrigerant. Cooling each room by natural circulation by
During heating, the refrigerant gas vaporized in the heat exchanger 1 of the outdoor unit is
There is a refrigerant circulation type air conditioning system in which each room is heated by circulating the pressure and the liquefied refrigerant liquid to the fan coil unit 2 by a pump 3 provided at a lower position of the building for returning to the heat exchanger 1. . In FIG. 3, reference numeral 5 denotes a refrigerant liquid conveying pipe, 6 denotes a refrigerant gas conveying pipe, 7 denotes an expansion valve, and 8 denotes a liquid receiver.
【０００３】このシステムにあっては、冷媒の搬送管を
冷房、暖房用に共用することができるため、配管数を削
減でき、配管工事のための費用も削減できてイニシャル
コストを大幅に軽減できるだけでなく、冷房運転時には
冷媒の搬送動力を必要としないため、冷房運転時のラン
ニングコストを大幅に軽減することができるという利点
を有する反面、吸収式冷凍機等の熱交換器を建物の最上
部に設置し、冷媒液のポテンシャルエネルギーとガス圧
によって冷媒を循環させるようにしたものであるから、
ファンコイルユニットの設置場所に大きな高低差がある
場合、冷房時には冷媒液の圧力が最も高い最下階のファ
ンコイルユニットに供給される冷媒液の供給量が最も多
く、上層階に行くに従ってその供給量は少なくなり、
三、四階ある多層階の建物にあっては、最下階のファン
コイルユニットと最上階のファンコイルユニットとでは
冷媒液の供給量が極端に異なって冷媒の供給バランスが
悪く、逆に、暖房時には冷媒ガスの圧力が最も高い最上
階のファンコイルユニットに供給される冷媒ガスの供給
量が最も多く、下層階に行くに従ってその供給量が少な
くなり、同じ最上階のファンコイルユニットと最下階の
ファンコイルユニットとでは冷媒の供給バランスが悪い
という問題があった。In this system, the refrigerant transfer pipe can be shared for cooling and heating, so that the number of pipes can be reduced, the cost for piping work can be reduced, and the initial cost can be greatly reduced. In addition, the cooling operation does not require the power for transporting the refrigerant, so that the running cost during the cooling operation can be greatly reduced.On the other hand, the heat exchanger such as the absorption refrigerator is installed at the top of the building. Since the refrigerant is circulated by the potential energy and gas pressure of the refrigerant liquid,
If there is a large difference in the height of the installation location of the fan coil unit, the cooling fluid is supplied to the lowest floor fan coil unit, which has the highest pressure during cooling, and the supply volume of the coolant is the highest as it goes to the upper floor. The amount is reduced,
In a multi-story building with three or four floors, the supply amount of the refrigerant liquid is extremely different between the fan coil unit on the lowest floor and the fan coil unit on the top floor, and the supply balance of the refrigerant is poor. During heating, the highest supply of refrigerant gas is supplied to the fan coil unit on the top floor where the pressure of the refrigerant gas is the highest, and the supply amount decreases as going to the lower floor, and the same amount of refrigerant gas is supplied to the same top floor fan coil unit. There was a problem that the supply balance of the refrigerant with the fan coil units on the floor was poor.
【０００４】本特許出願人らはこの問題を解決するもの
として先に特開平９−２６１８７号公報に開示されるも
のを出願した。これは図３に示すシステムにおいて、膨
張弁には各部屋のファンコイルユニットの運転停止時に
自動的に閉鎖して上記ファンコイルユニットの熱交換器
への冷媒の供給を遮断する比例制御可能な電子膨張弁を
用いている。各ファンコイルユニットの冷房時に冷媒の
入口となる側と冷媒の出口なる側に夫々温度センサーを
配置してあり、温度センサーで冷媒入口と冷媒出口の温
度を測定することでこの間の温度差を測定し、この温度
差が一定になるように膨張弁を開閉制御するようにして
ある。The present applicants have previously filed an application disclosed in Japanese Patent Application Laid-Open No. 9-26187 to solve this problem. In the system shown in FIG. 3, the expansion valve has a proportionally controllable electronic device that automatically closes when the operation of the fan coil unit in each room is stopped and shuts off the supply of refrigerant to the heat exchanger of the fan coil unit. An expansion valve is used. Temperature sensors are located on the side that is the inlet of the refrigerant and the side that is the outlet of the refrigerant during cooling of each fan coil unit, and the temperature difference is measured by measuring the temperature of the refrigerant inlet and the refrigerant outlet with the temperature sensor The expansion valve is controlled to open and close so that the temperature difference becomes constant.
【０００５】[0005]
【発明が解決しようとする課題】上記特開平９−２６１
８７号公報のようにしてあると、各階における冷媒の圧
力差があっても各ファンコイルユニットへの冷媒の供給
量は均一化され、冷房時、暖房時の如何に拘わらず各階
のファンコイルユニットへの冷媒の供給バランスを良好
ならしめることができるが、次の新たな問題がある。冷
房時に於ける部分負荷時には、運転停止中等のファンコ
イルユニットでは膨張弁がほぼ全閉状態となり、この略
全閉状態となる時間が長くなるために冷媒循環が阻害さ
れてしまうという問題がある。SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 9-261 is disclosed.
No. 87, the supply amount of the refrigerant to each fan coil unit is made uniform even if there is a pressure difference of the refrigerant on each floor, and the fan coil units on each floor are irrespective of cooling or heating. Although the supply balance of the refrigerant to the refrigerant can be improved, there is the following new problem. At the time of partial load during cooling, in a fan coil unit during operation stop or the like, the expansion valve is in a substantially fully closed state, and there is a problem in that the time for the substantially fully closed state is long, which impedes refrigerant circulation.
【０００６】またこれらの問題を解決するものとにして
本特許出願人らは先に特開平９−２６１８５号公報に開
示されるものも出願した。これは図３に示すシステムに
おいて、特開平９−２６１８７号公報と同様に電子膨張
弁を用いている。各ファンコイルユニットの冷房時の冷
媒入口側に温度センサーを配置してあり、冷房時温度セ
ンサーで冷媒入口の温度がある温度以上になった時に膨
張弁を全開するようにしてある。ところが、冷房運転時
で部分負荷時に運転停止中等のファンコイルユニットの
膨張弁も全開することとなり、このファンコイルユニッ
トの熱交換器に冷媒液が滞留して冷媒循環を阻害すると
いう問題がある。In order to solve these problems, the present applicant has previously filed an application disclosed in Japanese Patent Application Laid-Open No. 9-26185. This uses an electronic expansion valve in the system shown in FIG. 3 as in Japanese Patent Application Laid-Open No. 9-26187. A temperature sensor is arranged on the refrigerant inlet side of each fan coil unit at the time of cooling, and the expansion valve is fully opened when the temperature of the refrigerant inlet becomes higher than a certain temperature by the temperature sensor at the time of cooling. However, during the cooling operation, the expansion valve of the fan coil unit when the operation is stopped at the time of the partial load is also fully opened, and there is a problem that the refrigerant liquid stays in the heat exchanger of the fan coil unit and hinders the circulation of the refrigerant.
【０００７】本発明は叙述の点に鑑みてなされたもので
あって、冷房時で部分負荷時に冷媒の循環を阻害しない
ようにできる冷媒循環式空調システムを提供することを
課題とする。[0007] The present invention has been made in view of the above description, and it is an object of the present invention to provide a refrigerant circulating air-conditioning system which can prevent the circulation of the refrigerant during cooling and partial load.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
に本発明の請求項１の冷媒循環式空調システムは、建物
の上部位置に室外機の熱交換器１を設置し、同熱交換器
１と建物内の各部屋に設置のファンコイルユニット２と
の間を冷媒の搬送管で連結して冷媒が循環する閉回路を
構成し、冷房時には室外機の熱交換器１内の冷媒液を複
数のファンコイルユニット２に重力の作用と気化した冷
媒ガスの圧力により主に自然循環させることにより各部
屋を冷房し、暖房時には室外機の熱交換器１で気化した
冷媒ガスを、そのガスの圧力と液化した冷媒液を室外機
の熱交換器１に戻すための建物下部位置に設けたポンプ
３によりファンコイルユニット２に循環させることによ
り各部屋を暖房するようにしたものにおいて、冷房時に
ファンコイルユニット２の冷媒入口側の冷媒液の温度を
測定し、この入口側の冷媒液の温度がある複数段階の夫
々の設定温度以上になったときその温度に応じてファン
コイルユニット２の熱交換器へ冷媒液を流すための膨張
弁７の開度を夫々複数段階に制御するコントローラー９
を設けて成ることを特徴とする。このようにしたことで
冷媒入口の温度が複数段階の設定温度のうち低い方の設
定温度を越えたとき膨張弁７を小さい所定の開度に開
き、複数段階の設定温度のうち高い方の設定温度を越え
たとき膨張弁７を上記より大きい所定の開度に開くよう
に制御できるものであって、冷房運転時の部分負荷時で
も冷媒入口の温度に応じて膨張弁７を適宜開度に開いて
冷媒を流すことができ、冷媒を適当量流して冷媒の停滞
を防止できる。また従来の膨張弁７を全開するものよう
に膨張弁７を必要以上開くことがないので運転停止中や
負荷の小さいファンコイルユニット２の熱交換器に冷媒
液が滞留して冷媒が停滞するのを防止できる。According to a first aspect of the present invention, there is provided a refrigerant circulation type air conditioning system having an outdoor unit heat exchanger installed at an upper part of a building. 1 and a fan coil unit 2 installed in each room in the building are connected by a refrigerant transport pipe to form a closed circuit in which the refrigerant circulates. During cooling, the refrigerant liquid in the heat exchanger 1 of the outdoor unit is cooled. Each room is cooled by mainly circulating naturally by the action of gravity and the pressure of the vaporized refrigerant gas to the plurality of fan coil units 2, and the refrigerant gas vaporized by the heat exchanger 1 of the outdoor unit is cooled by heating when the room is heated. A system in which each room is heated by circulating pressure and liquefied refrigerant liquid to a fan coil unit 2 by a pump 3 provided at a lower part of the building for returning to a heat exchanger 1 of an outdoor unit. Coil uni The temperature of the refrigerant liquid on the refrigerant inlet side of the fan 2 is measured, and when the temperature of the refrigerant liquid on the inlet side exceeds a certain set temperature in each of a plurality of stages, the heat exchanger of the fan coil unit 2 is operated in accordance with the temperature. 9 for controlling the degree of opening of the expansion valve 7 for flowing the refrigerant liquid to the plurality of stages.
Is provided. With this configuration, when the temperature of the refrigerant inlet exceeds the lower set temperature of the plurality of set temperatures, the expansion valve 7 is opened to a small predetermined opening, and the higher set temperature of the plurality of set temperatures is set. When the temperature exceeds the temperature, the expansion valve 7 can be controlled to open to the above-described predetermined opening degree, and the expansion valve 7 is appropriately opened according to the temperature of the refrigerant inlet even at a partial load during the cooling operation. The refrigerant can be opened to allow the refrigerant to flow, and an appropriate amount of the refrigerant can flow to prevent the refrigerant from stagnating. Further, since the expansion valve 7 is not opened more than necessary as in the conventional case where the expansion valve 7 is fully opened, the refrigerant liquid stays in the heat exchanger of the fan coil unit 2 with a small load during operation stoppage and the refrigerant stagnates. Can be prevented.
【０００９】また本発明の請求項２の冷媒循環式空調シ
ステムは、冷房時にファンコイルユニット２の冷媒入口
側の温度と、ファンコイルユニット２の冷媒入出口の温
度差を常時測定し、入口温度が設定温度以上になり且つ
入出口の温度差が一定以上となった場合にファンコイル
ユニット２の熱交換器へ冷媒液を流すための膨張弁７の
開度をある開度に開けるように制御するコントローラー
９を設けて成ることを特徴とする。この場合、入口温度
が設定温度以上となり且つ入出口温度差が一定以上とな
った時に膨張弁７の開度をある開度に開けることで冷媒
を流すことができ、冷房運転時の部分負荷時でも冷媒を
適当量流して冷媒の停滞を防止できる。また従来の膨張
弁を全開するもののように膨張弁７を必要以上開くこと
がないので運転停止中や負荷の小さいファンコイルユニ
ットの熱交換器に冷媒液が滞留して停滞するのを防止で
きる。Further, in the refrigerant circulation type air conditioning system according to a second aspect of the present invention, the temperature difference between the refrigerant inlet side of the fan coil unit 2 and the refrigerant inlet / outlet of the fan coil unit 2 is constantly measured during cooling, and the inlet temperature is measured. Is controlled so that the opening degree of the expansion valve 7 for flowing the refrigerant liquid to the heat exchanger of the fan coil unit 2 is opened to a certain opening degree when the temperature becomes equal to or higher than the set temperature and the temperature difference between the inlet and the outlet becomes equal to or higher than a predetermined value. The controller 9 is provided. In this case, when the inlet temperature is equal to or higher than the set temperature and the difference between the inlet and outlet temperatures is equal to or higher than a certain value, the refrigerant can be caused to flow by opening the opening of the expansion valve 7 to a certain opening. However, stagnation of the refrigerant can be prevented by flowing an appropriate amount of the refrigerant. Further, since the expansion valve 7 is not opened more than necessary unlike the conventional case where the expansion valve is fully opened, it is possible to prevent the refrigerant liquid from staying in the heat exchanger of the fan coil unit having a small load during operation stoppage.
【００１０】また本発明の請求項３の冷媒循環式空調シ
ステムは、冷房時にファンコイルユニット２の冷媒入口
側の温度と、ファンコイルユニット２の冷媒入出口の温
度差を常時測定し、この入口側の冷媒液の温度がある複
数段階の夫々の設定温度以上になったときその温度に応
じてファンコイルユニット２の熱交換器へ冷媒液を流す
ための膨張弁７の開度を夫々複数段階に制御すると共に
入口温度が設定温度以上になり且つ入出口の温度差が一
定以上となった場合にファンコイルユニットの熱交換器
へ冷媒液を流すための膨張弁７の開度をある開度に開け
るように制御するコントローラー９を設けて成ることを
特徴とする。冷媒入口の温度が複数段階の設定温度のう
ち低い方の設定温度を越えたとき膨張弁７を小さい所定
の開度に開き、複数段階の設定温度のうち高い方の設定
温度を越えたとき膨張弁７を上記より大きい所定の開度
に開くように制御でき、また入口温度が設定温度以上と
なり且つ入出口温度差が一定以上となった時に膨張弁７
の開度をある開度に開けることで冷媒を流すことができ
るものであって、冷房運転時の部分負荷時でも冷媒入口
の温度に応じて膨張弁７を適宜開度に開いて冷媒を流す
ことができ、冷媒を適当量流して冷媒の停滞を防止でき
る。また従来の膨張弁７を全開するものように膨張弁７
を必要以上開くことがないので運転停止中や負荷の小さ
いファンコイルユニット２の熱交換器に冷媒液が滞留し
て冷媒が停滞するのを防止できる。According to a third aspect of the present invention, there is provided a refrigerant circulation type air conditioning system which constantly measures a temperature difference between a refrigerant inlet side of the fan coil unit 2 and a refrigerant inlet / outlet of the fan coil unit 2 during cooling. When the temperature of the refrigerant liquid on the side exceeds a set temperature in each of a plurality of stages, the opening degree of the expansion valve 7 for flowing the refrigerant liquid to the heat exchanger of the fan coil unit 2 is adjusted in accordance with the temperature in each of a plurality of stages. When the inlet temperature is equal to or higher than the set temperature and the temperature difference between the inlet and outlet is equal to or higher than a predetermined value, the opening degree of the expansion valve 7 for flowing the refrigerant liquid to the heat exchanger of the fan coil unit is adjusted to a certain opening degree. And a controller 9 for controlling the opening to open. When the temperature of the refrigerant inlet exceeds a lower set temperature among a plurality of set temperatures, the expansion valve 7 is opened to a small predetermined opening degree, and when the temperature exceeds a higher set temperature among a plurality of set temperatures, expansion is performed. The valve 7 can be controlled to open to the above-mentioned predetermined opening degree, and when the inlet temperature becomes higher than the set temperature and the inlet / outlet temperature difference becomes higher than a certain value, the expansion valve 7 is opened.
The refrigerant can be made to flow by opening the opening to a certain degree, and the refrigerant flows by appropriately opening the expansion valve 7 to the opening depending on the temperature of the refrigerant inlet even at a partial load during the cooling operation. It is possible to prevent the stagnation of the refrigerant by flowing an appropriate amount of the refrigerant. Also, the expansion valve 7 is opened like the conventional expansion valve 7 is fully opened.
Is not opened more than necessary, so that the refrigerant liquid can be prevented from staying in the heat exchanger of the fan coil unit 2 with a small load when the operation is stopped, and the refrigerant can be prevented from staying.
【００１１】[0011]
【発明の実施の形態】以下本発明システムの実施の形態
を図面により具体的に説明する。図１は本発明システム
であり、１は、建物の屋上にある機械室に設置された室
外機たる吸収式冷凍機、蒸発器等の熱交換器で、冷房時
に冷水等により、暖房時には温水等によって内部の熱交
換コイルを通過する冷媒が冷却または加熱される。２
は、各部屋に設置されたファンコイルユニットで、部屋
の大きさによってファンコイルユニット２の容量も変わ
るが、本実施の形態の場合、説明を簡単にするために全
てのファンコイルユニット２は同一容量のものとする。
７は、各部屋のファンコイルユニット２の運転停止時自
動的に閉鎖して上記ファンコイルユニット２の熱交換器
（図示せず）への冷媒の供給を遮断する比例制御可能な
電子膨張弁のような膨張弁である。６は、暖房時には室
外機の熱交換器１で加熱されて気化した冷媒ガスを各フ
ァンコイルユニット２に供給し、冷房時には各ファンコ
イルユニット２の熱交換器を通過して気化した冷媒ガス
を熱交換器１に戻すための冷媒ガス搬送管、５は、暖房
時にはファンコイルユニット２の熱交換器を通過して液
化した冷媒液を熱交換器１に戻し、冷房時には熱交換器
１で冷却されて液化した冷媒を熱交換器１から各部屋の
ファンコイルユニット２の熱交換器に供給する冷媒液搬
送管である。３は、暖房時各部屋のファンコイルユニッ
ト２の熱交換器を通過して液化した冷媒液を熱交換器１
に戻すためのポンプ、１０は、冷房時と暖房時に交互に
開閉して冷媒の流れを制御するバルブである。１１は、
各部屋のファンコイルユニット２の熱交換器の冷媒ガス
側の温度を常時測定する温度センサー、１２は、同熱交
換器の冷媒液側の温度を常時測定する温度センサー、９
は、冷、暖房運転の切り替え毎に機能が切り替えられ、
冷房時と暖房時に両温度センサー１１，１２が測定した
温度差Δｔを監視し、その温度差が一定の温度差となる
ようにファンコイルユニット２の膨張弁７を開閉制御し
たり、冷房時において温度センサー１２にて測定した冷
媒液側の温度を監視し、その温度により膨張弁７を開閉
制御したりするコントローラーである。本発明の場合、
温度センサー１２にて冷媒液側（冷房時のファンコイル
ユニット２の入口側）の温度を監視するが、部分負荷が
かかる状態で冷房運転しているとき、低いある設定温度
とこれより高いある設定温度の２段階の設定温度を越え
たとき、コントローラー９にて膨張弁７を２段階の弁開
度に制御できるようになっており、また入口側の温度が
ある設定温度を越えると共に冷媒液側の温度と冷媒ガス
側（冷房時のファンコイルユニット２の出口側）の温度
の温度差が一定以上になったとき、コントローラー９に
て膨張弁７をある開度に開けるように制御できるように
なっている。１３は冷媒液戻し管である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the system of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a system of the present invention. 1 is a heat exchanger such as an absorption refrigerator or an evaporator which is an outdoor unit installed in a machine room on the roof of a building. Thereby, the refrigerant passing through the internal heat exchange coil is cooled or heated. 2
Is a fan coil unit installed in each room, and the capacity of the fan coil unit 2 varies depending on the size of the room. However, in the case of the present embodiment, all fan coil units 2 are the same for simplifying the description. It shall be of capacity.
Reference numeral 7 denotes a proportionally controllable electronic expansion valve which automatically closes when the operation of the fan coil unit 2 in each room is stopped and shuts off supply of refrigerant to a heat exchanger (not shown) of the fan coil unit 2. Such an expansion valve. 6 supplies the refrigerant gas heated and vaporized by the heat exchanger 1 of the outdoor unit to each fan coil unit 2 at the time of heating, and the refrigerant gas vaporized by passing through the heat exchanger of each fan coil unit 2 at the time of cooling. The refrigerant gas transfer pipe 5 for returning to the heat exchanger 1 returns the liquefied refrigerant liquid that has passed through the heat exchanger of the fan coil unit 2 to the heat exchanger 1 during heating, and is cooled by the heat exchanger 1 during cooling. The refrigerant liquid transfer pipe supplies the liquefied refrigerant from the heat exchanger 1 to the heat exchangers of the fan coil units 2 in each room. Reference numeral 3 denotes a refrigerant liquid that has passed through the heat exchanger of the fan coil unit 2 in each room during heating and is liquefied.
The pump 10 is a valve that opens and closes alternately during cooling and heating to control the flow of the refrigerant. 11 is
A temperature sensor for constantly measuring the temperature of the refrigerant gas side of the heat exchanger of the fan coil unit 2 in each room; 12 a temperature sensor for constantly measuring the temperature of the refrigerant liquid side of the heat exchanger;
, The function is switched every time switching between cooling and heating operation,
The temperature difference Δt measured by the temperature sensors 11 and 12 during cooling and heating is monitored, and the expansion valve 7 of the fan coil unit 2 is controlled to open and close so that the temperature difference becomes a constant temperature difference. The controller monitors the temperature of the refrigerant liquid measured by the temperature sensor 12 and controls the opening and closing of the expansion valve 7 based on the monitored temperature. In the case of the present invention,
The temperature of the refrigerant liquid side (the inlet side of the fan coil unit 2 at the time of cooling) is monitored by the temperature sensor 12, and when the cooling operation is performed in a state where partial load is applied, a certain set temperature lower than a certain set temperature and a certain set temperature higher than this. When the temperature exceeds the two-step set temperature, the controller 9 can control the expansion valve 7 to the two-step valve opening degree. When the temperature difference between the temperature of the refrigerant gas and the temperature of the refrigerant gas side (the outlet side of the fan coil unit 2 at the time of cooling) becomes equal to or more than a predetermined value, the controller 9 can control the expansion valve 7 to open to a certain opening. Has become. 13 is a refrigerant liquid return pipe.
【００１２】上記本発明システムを冷房運転とし、各部
屋のファンコイルユニット２の運転を開始すると、運転
開始当初は各部屋の熱負荷が大きいため、その熱負荷を
速やかに解消すべくコントローラー９はファンコイルユ
ニット２の膨張弁７に信号を送って弁体を最大開度にし
て冷媒液をファンコイルユニット２の熱交換器に供給す
る。このとき冷媒液の入口側と出口側の温度差Δｔは非
常に大きい。When the system of the present invention is set to the cooling operation and the operation of the fan coil unit 2 in each room is started, since the heat load in each room is large at the beginning of the operation, the controller 9 needs to quickly eliminate the heat load. A signal is sent to the expansion valve 7 of the fan coil unit 2 to open the valve body to the maximum degree and supply the refrigerant liquid to the heat exchanger of the fan coil unit 2. At this time, the temperature difference Δt between the inlet side and the outlet side of the refrigerant liquid is very large.
【００１３】熱負荷が小さくなり、冷媒液の入口側と出
口側の温度差Δｔが小さくなってある設定された値例え
ば５℃になると、コントローラー９はこの温度差を保つ
ように膨張弁７の弁体を開閉制御してファンコイルユニ
ット２の熱交換器への冷媒液の供給量を調整する。この
制御は運転している全てのファンコイルユニット２で行
われるため、各階において冷媒液の圧力差があっても全
ファンコイルユニット２での冷媒液の供給量は略均一化
され、各階のファンコイルユニット２への冷媒の供給の
バランスが良好となる。When the heat load decreases and the temperature difference Δt between the inlet side and the outlet side of the refrigerant liquid decreases to a predetermined value, for example, 5 ° C., the controller 9 controls the expansion valve 7 so as to maintain this temperature difference. By controlling the opening and closing of the valve element, the supply amount of the refrigerant liquid to the heat exchanger of the fan coil unit 2 is adjusted. Since this control is performed in all the operating fan coil units 2, even if there is a pressure difference of the refrigerant liquid in each floor, the supply amount of the refrigerant liquid in all the fan coil units 2 is substantially uniform, and the fan of each floor is The supply balance of the refrigerant to the coil unit 2 is improved.
【００１４】本発明システムを暖房運転とし、各部屋の
ファンコイルユニット２の運転を開始すると、運転開始
当初は各部屋の熱負荷が大きいため、その熱負荷を速や
かに解消すべくコントローラー９はファンコイルユニッ
ト２の膨張弁７に信号を送って弁体を最大開度にして冷
媒ガスをファンコイルユニット２の熱交換器に供給す
る。このとき冷媒ガスの入口側と出口側の温度差Δｔが
非常に大きい。When the system of the present invention is set to the heating operation and the operation of the fan coil unit 2 in each room is started, since the heat load of each room is large at the beginning of the operation, the controller 9 operates the fan 9 in order to quickly eliminate the heat load. A signal is sent to the expansion valve 7 of the coil unit 2 to open the valve body to the maximum degree, and the refrigerant gas is supplied to the heat exchanger of the fan coil unit 2. At this time, the temperature difference Δt between the inlet side and the outlet side of the refrigerant gas is very large.
【００１５】熱負荷が小さくなり、冷媒ガスの入口側と
出口側の温度差Δｔが小さくなってそのΔｔがある設定
された値例えば１０℃になると、コントローラー９はこ
の温度差を保つように膨張弁７の弁体を開閉制御してフ
ァンコイルユニット２の熱交換器への冷媒ガスの供給量
を調整する。この制御は運転している全てのファンコイ
ルユニット２で行われるため、各階において冷媒ガスの
圧力差があっても全ファンコイルユニット２での冷媒ガ
スの供給量は略均一化され、各階のファンコイルユニッ
ト２への冷媒の供給のバランスが良好になる。When the heat load decreases and the temperature difference Δt between the inlet and the outlet of the refrigerant gas decreases and the Δt reaches a predetermined value, for example, 10 ° C., the controller 9 expands to maintain this temperature difference. The opening and closing of the valve of the valve 7 is controlled to adjust the supply amount of the refrigerant gas to the heat exchanger of the fan coil unit 2. Since this control is performed in all the operating fan coil units 2, the supply amount of the refrigerant gas in all the fan coil units 2 is substantially uniform even if there is a pressure difference of the refrigerant gas in each floor, and the fan in each floor is The supply balance of the refrigerant to the coil unit 2 is improved.
【００１６】尚、上記制御運転中、各部屋の温度調節
は、冷媒の供給量の調整によって行うことができないの
で、ファンコイルユニット２のファンによる送風量の調
節によって行うものである。また本発明システムを冷房
運転としたときで、部分負荷の場合にはコントローラー
９で次のように制御を行う。部分負荷の運転を行うとき
は運転停止中のファンコイルユニット２等があって、膨
張弁７が略全閉状態のものがあるが、このように膨張弁
７が略全閉状態のものでは冷媒が殆ど流れることなく、
冷媒液搬送管５の冷媒液の流量が少なくなって冷媒液の
温度が高くなって冷媒液が気化して冷媒ガス発生し、冷
媒ガスが冷媒液搬送管５の屋上横引き管等に停滞して冷
媒循環を阻害するおそれが、次のように制御することで
冷媒循環を阻害するのを防止するようにできる。つま
り、ファンコイルユニット２の入口側に温度センサー１
２を設けてあり、この温度センサー１２で入口側の温度
を測定してコントローラー９で監視して膨張弁７を制御
するようになっている。そして入口側の冷媒液の温度Ｔ
Ｌがある低い方の設定温度Ｔ1 （例えば１５℃）を越え
ると（ＴＬ≧Ｔ1 ）、膨張弁７を最小開度（例えば１５
％）だけ開いて冷媒液をファンコイルユニット２の熱交
換器に流すように制御を行う（ただし、膨張弁７の現開
度が上記最小開度より大きいときは現開度を維持す
る）。つまり、冷媒液搬送管５側の冷媒液の温度は、冷
媒液搬送管５を流れる冷媒液の流量が少ないと高くな
り、流量が多いと低くなるが、温度が高いとき流量が少
ないために膨張弁７を開いて流量を多くする。勿論、冷
媒液搬送管５側の温度ＴＬがある温度Ｔ1 以下の場合
（ＴＬ≧Ｔ１）、冷媒液搬送管５の冷媒液の流量が所定
以上のために膨張弁７を略全閉状態にしておく。このと
き、入口側の温度ＴＬが設定温度Ｔ1 （例えば１５℃）
越え（ＴＬ≧Ｔ1 ）且つ入出口の温度差が一定以上の温
度（例えば出口側の温度をＴｏとし、入口側の温度をＴ
ｉとし、一定の温度差をＴｄとして、Ｔｏ−Ｔｉ≧Ｔｄ
の関係となるときで例えばＴｄは１℃である）ときに膨
張弁７を最小の開度（例えば１５％）となるように開い
て冷媒液をファンコイルユニット２の熱交換器に流すよ
うに制御を行ってもよい。また入口側の冷媒液の温度Ｔ
Ｌが高い方の設定温度Ｔ2 （例えば１８℃）を越えると
（ＴＬ≧Ｔ2 ）、膨張弁７を半開にして冷媒液をファン
コイルユニット２の熱交換器に流すように制御する（こ
の場合、膨張弁７の現開度が半開より大きいと、現開度
を維持する。）。このようにする入口側の温度や入出口
の温度差に応じて適宜の弁開度になるように膨張弁７を
制御でき、ファンコイルユニット２の熱交換器に適当な
冷媒を流して冷媒の循環の停滞を防止でき、またファン
コイルユニット２の熱交換器に必要以上冷媒液を流すこ
とによる滞留を防止でき、冷媒を円滑に循環させること
ができる。During the above-mentioned control operation, the temperature of each room cannot be adjusted by adjusting the supply amount of the refrigerant. Therefore, the temperature of each room is adjusted by adjusting the amount of air blown by the fan of the fan coil unit 2. When the system of the present invention is in the cooling operation and the load is a partial load, the controller 9 performs the following control. When the partial load operation is performed, there is the fan coil unit 2 and the like that are not operating and the expansion valve 7 is in a substantially fully closed state. Hardly flows
The flow rate of the refrigerant liquid in the refrigerant liquid transfer pipe 5 decreases, the temperature of the refrigerant liquid increases, the refrigerant liquid evaporates to generate refrigerant gas, and the refrigerant gas stagnates on the roof horizontal drawing pipe or the like of the refrigerant liquid transfer pipe 5. However, it is possible to prevent the refrigerant circulation from being impaired by performing the following control. That is, the temperature sensor 1 is provided on the inlet side of the fan coil unit 2.
The temperature sensor 12 measures the temperature on the inlet side and the controller 9 monitors the temperature to control the expansion valve 7. And the temperature T of the refrigerant liquid on the inlet side
When L exceeds a lower set temperature T 1 (for example, 15 ° C.) (TL ≧ T 1 ), the expansion valve 7 is opened to the minimum opening degree (for example, 15 ° C.).
%) To control the refrigerant liquid to flow to the heat exchanger of the fan coil unit 2 (however, if the current opening of the expansion valve 7 is larger than the minimum opening, the current opening is maintained). In other words, the temperature of the refrigerant liquid on the side of the refrigerant liquid transfer pipe 5 increases when the flow rate of the refrigerant liquid flowing through the refrigerant liquid transfer pipe 5 is low, and decreases when the flow rate is high, but expands because the flow rate is low when the temperature is high. Open the valve 7 to increase the flow rate. Of course, if the following temperatures T 1 there is a temperature TL of the refrigerant fluid conveying pipe 5 side (TL ≧ T1), the flow rate of the refrigerant liquid in the refrigerant liquid transport pipe 5 is in a substantially fully closed expansion valve 7 for more than a predetermined Keep it. At this time, the temperature TL on the inlet side is the set temperature T 1 (for example, 15 ° C.)
(TL ≧ T 1 ) and the temperature difference between the inlet and outlet is equal to or higher than a certain value (for example, the temperature on the outlet side is To, and the temperature on the inlet side is T
i, and a constant temperature difference Td, To-Ti ≧ Td
When, for example, Td is 1 ° C.), the expansion valve 7 is opened to a minimum opening (for example, 15%) so that the refrigerant liquid flows to the heat exchanger of the fan coil unit 2. Control may be performed. Also, the temperature T of the refrigerant liquid on the inlet side
When L exceeds the higher set temperature T 2 (for example, 18 ° C.) (TL ≧ T 2 ), the expansion valve 7 is half-opened to control the refrigerant liquid to flow to the heat exchanger of the fan coil unit 2 (this is referred to as “L”). In this case, if the current opening of the expansion valve 7 is larger than half opening, the current opening is maintained.) The expansion valve 7 can be controlled so as to have an appropriate valve opening according to the temperature difference between the inlet side and the inlet / outlet in this manner, and an appropriate refrigerant flows through the heat exchanger of the fan coil unit 2 to cool the refrigerant. The stagnation of circulation can be prevented, the stagnation caused by flowing the refrigerant liquid more than necessary to the heat exchanger of the fan coil unit 2 can be prevented, and the refrigerant can be circulated smoothly.
【００１７】[0017]
【発明の効果】本発明の請求項１の発明は、冷房時にフ
ァンコイルユニットの冷媒入口側の冷媒液の温度を測定
し、この入口側の冷媒液の温度がある複数段階の夫々の
設定温度以上になったときその温度に応じてファンコイ
ルユニットの熱交換器へ冷媒液を流すための膨張弁の開
度を夫々複数段階に制御するコントローラーを設けてい
るので、冷媒入口の温度が複数段階の設定温度のうち低
い方の設定温度を越えたとき膨張弁を小さい所定の開度
に開き、複数段階の設定温度のうち高い方の設定温度を
越えたとき膨張弁を上記より大きい所定の開度に開くよ
うに制御できるものであって、冷房運転時の部分負荷時
でも冷媒入口の温度に応じて膨張弁を適宜開度に開いて
冷媒を流すことができ、冷媒を適当量流して冷媒の停滞
を防止できるものであり、また従来の膨張弁を全開する
ものように膨張弁を必要以上開くことがないので運転停
止中や負荷の小さいファンコイルユニットの熱交換器に
冷媒液が滞留して冷媒が停滞するのを防止できて冷媒を
スムーズに循環させることができるものである。According to the first aspect of the present invention, during cooling, the temperature of the refrigerant liquid on the refrigerant inlet side of the fan coil unit is measured, and the temperature of the refrigerant liquid on the inlet side is set at each of a plurality of set temperatures. When the temperature becomes higher than the above, there is provided a controller for controlling the opening degree of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit in a plurality of stages according to the temperature. When the temperature exceeds the lower one of the set temperatures, the expansion valve is opened to a small predetermined degree of opening, and when the temperature exceeds the higher one of the set temperatures in a plurality of stages, the expansion valve is opened to the larger predetermined degree. The expansion valve can be opened to an appropriate degree according to the temperature of the refrigerant inlet even at a partial load during the cooling operation to allow the refrigerant to flow. That can prevent stagnation There is no need to open the expansion valve more than necessary as in the conventional case where the expansion valve is fully opened.Therefore, the refrigerant liquid stays in the heat exchanger of the fan coil unit with a small load when the operation is stopped or when the refrigerant stagnates. Thus, the refrigerant can be smoothly circulated.
【００１８】また本発明の請求項２の発明は、冷房時に
ファンコイルユニットの冷媒入口側の温度と、ファンコ
イルユニットの冷媒入出口の温度差を常時測定し、入口
温度が設定温度以上になり且つ入出口の温度差が一定以
上となった場合にファンコイルユニットの熱交換器へ冷
媒液を流すための膨張弁の開度をある開度に開けるよう
に制御するコントローラーを設けているので、入口温度
が設定温度以上となり且つ入出口温度差が一定以上とな
った時に膨張弁の開度をある開度に開けることで冷媒を
流すことができ、冷房運転時の部分負荷時でも冷媒を適
当量流して冷媒の停滞を防止できるものであり、また従
来の膨張弁を全開するもののように膨張弁を必要以上開
くことがないので運転停止中や負荷の小さいファンコイ
ルユニットの熱交換器に冷媒液が滞留して停滞するのを
防止できて冷媒の循環を促進できるものである。Further, according to the invention of claim 2 of the present invention, the temperature difference between the refrigerant inlet side of the fan coil unit and the temperature of the refrigerant inlet / outlet of the fan coil unit is constantly measured during cooling, and the inlet temperature becomes higher than the set temperature. And since the controller is provided to control the opening of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit to a certain opening when the temperature difference between the inlet and the outlet becomes equal to or more than a certain value, When the inlet temperature is equal to or higher than the set temperature and the inlet / outlet temperature difference is equal to or higher than a certain value, the refrigerant can be made to flow by opening the expansion valve to a certain opening. It can prevent the refrigerant from stagnating by mass flow, and does not open the expansion valve more than necessary unlike the conventional one that opens the expansion valve fully. Those capable of promoting circulation of the refrigerant can be prevented refrigerant liquid to stagnate staying in vessel.
【００１９】また本発明の請求項３の発明は、冷房時に
ファンコイルユニットの冷媒入口側の温度と、ファンコ
イルユニットの冷媒入出口の温度差を常時測定し、この
入口側の冷媒液の温度がある複数段階の夫々の設定温度
以上になったときその温度に応じてファンコイルユニッ
トの熱交換器へ冷媒液を流すための膨張弁の開度を夫々
複数段階に制御すると共に入口温度が設定温度以上にな
り且つ入出口の温度差が一定以上となった場合にファン
コイルユニットの熱交換器へ冷媒液を流すための膨張弁
の開度をある開度に開けるように制御するコントローラ
ーを設けているので、冷媒入口の温度が複数段階の設定
温度のうち低い方の設定温度を越えたとき膨張弁を小さ
い所定の開度に開き、複数段階の設定温度のうち高い方
の設定温度を越えたとき膨張弁を上記より大きい所定の
開度に開くように制御でき、また入口温度が設定温度以
上となり且つ入出口温度差が一定以上となった時に膨張
弁の開度をある開度に開けることで冷媒を流すことがで
きるものであって、冷房運転時の部分負荷時でも冷媒入
口の温度に応じて膨張弁を適宜開度に開いて冷媒を流す
ことができ、冷媒を適当量流して冷媒の停滞を防止でき
るものであり、また従来の膨張弁を全開するものように
膨張弁を必要以上開くことがないので運転停止中や負荷
の小さいファンコイルユニットの熱交換器に冷媒液が滞
留して冷媒が停滞するのを防止できて冷媒の循環を促進
できるものである。According to a third aspect of the present invention, the temperature difference between the refrigerant inlet side of the fan coil unit and the temperature of the refrigerant inlet / outlet of the fan coil unit is constantly measured during cooling, and the temperature of the refrigerant liquid at the inlet side is measured. When the temperature rises above each set temperature in a plurality of stages, the opening of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit is controlled in multiple stages according to the temperature, and the inlet temperature is set. A controller that controls the opening of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit to a certain opening when the temperature exceeds the temperature and the temperature difference between the inlet and the outlet becomes a certain value or more. When the temperature of the refrigerant inlet exceeds the lower set temperature of the plurality of set temperatures, the expansion valve is opened to a small predetermined opening degree, and the higher set temperature of the plurality of set temperatures is set. Over The expansion valve can be controlled to open to a predetermined opening larger than the above, and the opening of the expansion valve is opened to a certain opening when the inlet temperature becomes equal to or higher than the set temperature and the inlet / outlet temperature difference becomes higher than a certain value. In the cooling operation, the refrigerant can be caused to flow by opening the expansion valve to an appropriate opening degree according to the temperature of the refrigerant inlet even at a partial load during the cooling operation. In addition, since the expansion valve is not opened more than necessary as in the conventional case where the expansion valve is fully opened, the refrigerant liquid stays in the heat exchanger of the fan coil unit during operation stoppage or a small load. Thus, the refrigerant can be prevented from stagnating, and the circulation of the refrigerant can be promoted.
【図１】本発明システムの概略説明図である。FIG. 1 is a schematic explanatory diagram of a system of the present invention.
【図２】各ファンコイルユニットとコントローラーの概
略説明図である。FIG. 2 is a schematic explanatory view of each fan coil unit and a controller.
【図３】本発明の背景となるシステムの概略説明図であ
る。FIG. 3 is a schematic explanatory diagram of a system as a background of the present invention.
１ 熱交換器 ２ ファンコイルユニット ３ ポンプ ５ 冷媒液搬送管 ６ 冷媒ガス搬送管 ７ 膨張弁 ９ コントローラー １１ 温度センサー １２ 温度センサー DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Fan coil unit 3 Pump 5 Refrigerant liquid transfer pipe 6 Refrigerant gas transfer pipe 7 Expansion valve 9 Controller 11 Temperature sensor 12 Temperature sensor
Claims (3)
置し、同熱交換器と建物内の各部屋に設置のファンコイ
ルユニットとの間を冷媒の搬送管で連結して冷媒が循環
する閉回路を構成し、冷房時には室外機の熱交換器内の
冷媒液を複数のファンコイルユニットに重力の作用と気
化した冷媒ガスの圧力により主に自然循環させることに
より各部屋を冷房し、暖房時には室外機の熱交換器で気
化した冷媒ガスを、そのガスの圧力と液化した冷媒液を
室外機の熱交換器に戻すための建物下部位置に設けたポ
ンプによりファンコイルユニットに循環させることによ
り各部屋を暖房するようにした冷媒循環式空調システム
において、冷房時にファンコイルユニットの冷媒入口側
の冷媒液の温度を測定し、この入口側の冷媒液の温度が
ある複数段階の夫々の設定温度以上になったときその温
度に応じてファンコイルユニットの熱交換器へ冷媒液を
流すための膨張弁の開度を夫々複数段階に制御するコン
トローラーを設けて成ることを特徴とする冷媒循環式空
調システム。1. A heat exchanger for an outdoor unit is installed at an upper position of a building, and the heat exchanger and a fan coil unit installed in each room in the building are connected by a refrigerant transfer pipe to allow the refrigerant to flow therethrough. Constructs a closed circuit that circulates, and cools each room by mainly circulating the refrigerant liquid in the heat exchanger of the outdoor unit through the action of gravity and the pressure of the vaporized refrigerant gas in the outdoor unit during cooling. During heating, the refrigerant gas vaporized in the heat exchanger of the outdoor unit is circulated to the fan coil unit by a pump provided at a lower part of the building for returning the pressure of the gas and the liquefied refrigerant liquid to the heat exchanger of the outdoor unit. In the refrigerant circulation type air-conditioning system that heats each room, the temperature of the refrigerant liquid on the refrigerant inlet side of the fan coil unit is measured during cooling, and the temperature of the refrigerant liquid on the inlet side is determined at each of a plurality of stages. The refrigerant characterized by comprising a controller for controlling the opening degree of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit in a plurality of stages according to the temperature when the temperature becomes equal to or higher than the set temperature. Recirculating air conditioning system.
置し、同熱交換器と建物内の各部屋に設置のファンコイ
ルユニットとの間を冷媒の搬送管で連結して冷媒が循環
する閉回路を構成し、冷房時には室外機の熱交換器内の
冷媒液を複数のファンコイルユニットに重力の作用と気
化した冷媒ガスの圧力により主に自然循環させることに
より各部屋を冷房し、暖房時には室外機の熱交換器で気
化した冷媒ガスを、そのガスの圧力と液化した冷媒液を
室外機の熱交換器に戻すための建物下部位置に設けたポ
ンプによりファンコイルユニットに循環させることによ
り各部屋を暖房するようにした冷媒循環式空調システム
において、冷房時にファンコイルユニットの冷媒入口側
の温度と、ファンコイルユニットの冷媒入出口の温度差
を常時測定し、入口温度が設定温度以上になり且つ入出
口の温度差が一定以上となった場合にファンコイルユニ
ットの熱交換器へ冷媒液を流すための膨張弁の開度をあ
る開度に開けるように制御するコントローラーを設けて
成ることを特徴とする冷媒循環式空調システム。2. A heat exchanger of an outdoor unit is installed at an upper part of the building, and the heat exchanger is connected to a fan coil unit installed in each room in the building by a refrigerant transfer pipe to allow the refrigerant to flow therethrough. Constructs a closed circuit that circulates, and cools each room by mainly circulating the refrigerant liquid in the heat exchanger of the outdoor unit through the action of gravity and the pressure of the vaporized refrigerant gas in the outdoor unit during cooling. During heating, the refrigerant gas vaporized in the heat exchanger of the outdoor unit is circulated to the fan coil unit by a pump provided at a lower part of the building for returning the pressure of the gas and the liquefied refrigerant liquid to the heat exchanger of the outdoor unit. In the refrigerant circulation air conditioning system that heats each room, the temperature difference between the refrigerant inlet side of the fan coil unit and the refrigerant inlet / outlet of the fan coil unit during cooling is always measured. When the temperature becomes equal to or higher than the set temperature and the temperature difference between the inlet and the outlet becomes equal to or more than a predetermined value, the opening of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit is controlled to be opened to a certain opening. A refrigerant circulation type air conditioning system characterized by comprising a controller.
置し、同熱交換器と建物内の各部屋に設置のファンコイ
ルユニットとの間を冷媒の搬送管で連結して冷媒が循環
する閉回路を構成し、冷房時には室外機の熱交換器内の
冷媒液を複数のファンコイルユニットに重力の作用と気
化した冷媒ガスの圧力により主に自然循環させることに
より各部屋を冷房し、暖房時には室外機の熱交換器で気
化した冷媒ガスを、そのガスの圧力と液化した冷媒液を
室外機の熱交換器に戻すための建物下部位置に設けたポ
ンプによりファンコイルユニットに循環させることによ
り各部屋を暖房するようにした冷媒循環式空調システム
において、冷房時にファンコイルユニットの冷媒入口側
の温度と、ファンコイルユニットの冷媒入出口の温度差
を常時測定し、この入口側の冷媒液の温度がある複数段
階の夫々の設定温度以上になったときその温度に応じて
ファンコイルユニットの熱交換器へ冷媒液を流すための
膨張弁の開度を夫々複数段階に制御すると共に入口温度
が設定温度以上になり且つ入出口の温度差が一定以上と
なった場合にファンコイルユニットの熱交換器へ冷媒液
を流すための膨張弁の開度をある開度に開けるように制
御するコントローラーを設けて成ることを特徴とする冷
媒循環式空調システム。3. A heat exchanger for an outdoor unit is installed at an upper position of the building, and the heat exchanger is connected to a fan coil unit installed in each room in the building by a refrigerant transfer pipe. Constructs a closed circuit that circulates, and cools each room by mainly circulating the refrigerant liquid in the heat exchanger of the outdoor unit through the action of gravity and the pressure of the vaporized refrigerant gas in the outdoor unit during cooling. During heating, the refrigerant gas vaporized in the heat exchanger of the outdoor unit is circulated to the fan coil unit by a pump provided at a lower part of the building for returning the pressure of the gas and the liquefied refrigerant liquid to the heat exchanger of the outdoor unit. In the refrigerant circulation air-conditioning system that heats each room, the temperature difference between the refrigerant inlet side of the fan coil unit and the refrigerant inlet / outlet of the fan coil unit is always measured during cooling. When the temperature of the refrigerant liquid on the inlet side exceeds a certain set temperature in each of a plurality of stages, the opening degree of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit is set to a plurality of stages in accordance with the temperature. In addition to the control, when the inlet temperature becomes equal to or higher than the set temperature and the temperature difference between the inlet and outlet becomes equal to or higher than a certain value, the opening of the expansion valve for flowing the refrigerant liquid to the heat exchanger of the fan coil unit is opened to a certain opening. A refrigerant circulation type air conditioning system characterized by comprising a controller for controlling the air conditioner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9131001A JPH10318557A (en) | 1997-05-21 | 1997-05-21 | Refrigerant circulation type air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9131001A JPH10318557A (en) | 1997-05-21 | 1997-05-21 | Refrigerant circulation type air conditioning system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10318557A true JPH10318557A (en) | 1998-12-04 |
Family
ID=15047639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9131001A Pending JPH10318557A (en) | 1997-05-21 | 1997-05-21 | Refrigerant circulation type air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10318557A (en) |
-
1997
- 1997-05-21 JP JP9131001A patent/JPH10318557A/en active Pending
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