JPH055553A - Control device for air conditioner - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a control device for an air conditioner that does not cause discomfort to a person in a room due to air blown from the indoor unit. [Structure] First temperature detecting means 23 for detecting the temperature of the blown air, second temperature detecting means 22 for detecting the body surface temperature of a person in the room, and blown air detected by the first temperature detecting means. The indoor unit air volume control means 25 for calculating the amount of air blown from the indoor unit such that the temperature is not lower than the body surface temperature of the person in the room detected by the second temperature detection means, and blowing out the air volume obtained as a result. Air conditioner control device equipped with.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a heat pump type air conditioner operated by heating, which has means for controlling blown air from the indoor unit so that the indoor temperature approaches a preset temperature.

[0002]

2. Description of the Related Art When a heat pump type air conditioner is operated for heating, if the indoor heat exchanger included in the indoor unit is in a low temperature state at the start of operation, cold air blows into the room despite the heating operation. As a result, the person in the room feels uncomfortable as represented by chills. In order to prevent such discomfort, an upper limit is set for the amount of air blown from the indoor heat exchanger depending on the temperature of the indoor heat exchanger.

In recent air conditioners of variable capacity type, for example, in an air conditioner in which the rotation speed of a compressor motor, that is, a compressor can be finely adjusted by an inverter, the heating capacity can be continuously changed. However, as shown in FIG. 5, in the conventional method in which the indoor air flow rate is set only depending on the temperature Tc of the indoor heat exchanger, the maximum capacity required, which is the greatest advantage of the variable capacity type, is always exhibited. The guarantee that I can do it is not always available. Note that the example of FIG. 5 has a so-called hysteresis characteristic in which the air volume setting is changed depending on whether the temperature of the indoor heat exchanger is in the process of rising or falling, and in the process of rising temperature, With the unit of temperature being "° C", Tc <32 ... D zone (stop) 32≤Tc <34 ... C zone (weak wind) 34≤Tc <38 ... B zone (medium wind) Tc ≥ 38 ... A zone (strong wind) In the temperature decreasing process, Tc> 34 ... A zone (strong wind) 32 <Tc ≤34 ... B zone (medium wind) 20 <Tc ≤32 ... C zone (weak wind) Tc ≤20 ... D zone (stop) Is set to. In addition, "stop" here means to stop the indoor fan included in the indoor heat exchanger, and means zero air volume.

[0004]

By the way, in the conventional control system in which the air volume is uniformly set with respect to the temperature of the indoor heat exchanger, the temperature of the indoor heat exchanger must be controlled in order to reliably prevent the cold air from being blown out. Is set to a lower air flow rate, in other words, the indoor heat exchanger temperature is set to a higher air flow rate.

Therefore, in the conventional apparatus, in the process of increasing the room temperature by the heating operation, when the rotation speed of the compressor is decreased due to the increase of the room temperature, the temperature of the indoor heat exchanger decreases, Along with this, the air volume is significantly reduced, and this air volume reduction further reduces the capacity of the air conditioner.Therefore, not only the operating efficiency as an air conditioner is poor, but also the indoor temperature distribution is poor. It was done.

The present invention has been made in consideration of the above circumstances, and the operating efficiency of the device and the indoor temperature distribution are satisfied while satisfying the condition that the occupant does not feel uncomfortable due to the air blown from the indoor unit. It is an object of the present invention to provide a control device for an air conditioner that can improve the air conditioner.

[0007]

In order to achieve the above object, a control device for an air conditioner according to the present invention provides a first temperature detecting means for detecting the temperature of blown air and a body surface temperature of an occupant. The second temperature detecting means for detecting and the indoor unit in which the temperature of the blown air detected by the first temperature detecting means does not fall below the body surface temperature of the person in the room detected by the second temperature detecting means. An indoor unit air volume control means for calculating the air volume and blowing out the air volume obtained as a result.

[0008]

The temperature of the blown air is detected by the first temperature detecting means, and the body surface temperature of the person in the room is detected by the second temperature detecting means. The amount of air blown from the indoor unit is calculated such that the temperature of the blown air detected by the first temperature detection means does not fall below the body surface temperature of the person in the room detected by the second temperature detection means. By blowing out the air volume obtained as a result, it is possible to increase the air volume depending on the situation while avoiding the situation of feeling chills during heating operation, improving the operating efficiency and improving the indoor temperature distribution. You can

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings.

First, referring to FIG. 2, a schematic structure of a refrigeration cycle to which the present invention is applied, a driving device therefor, and a control device portion will be described.

The illustrated refrigeration cycle 10 is used in a heating operation mode, and includes a compressor (CP) 11, a four-way valve 12,
Indoor heat exchanger 13 functioning as a condenser, expansion valve 1
4 and the outdoor heat exchanger 1 functioning as an evaporator
It consists of 5. The indoor heat exchanger 13 is arranged in the room 16 to be heated, and other devices are arranged outdoors. The compressor 11 is driven at a variable speed via a frequency converter 18 and a compressor motor (CM) 19 by electric power supplied from an AC power supply 17 having a constant frequency.
The indoor heat exchanger 13 is provided with an indoor fan 20 for blowing the heat-exchanged air into the room 16, and the outdoor heat exchanger 15 is provided with an outdoor fan 21 for radiating and cooling. Has been done. The indoor unit is configured to include the indoor heat exchanger 13 and the indoor fan 20, and the outdoor unit is configured by other devices except the AC power supply 17, that is, the compressor 11, the outdoor heat exchanger 15, the frequency converter 18, the compressor motor 19, and the like. It is configured.

A temperature sensor 22 for detecting the room temperature Ta is provided in the room 16, and a temperature sensor 23 for detecting the temperature of the room heat exchanger 13, that is, the room heat exchanger temperature Tc. And are provided. Each detection output of the temperature sensors 22 and 23 is introduced into the control device 25. The control device 25 is provided with an operation unit 26 for setting the set temperature Ts in the room 16. Control device 25
The basic function of the refrigeration cycle 1 is that the indoor temperature Ta detected by the temperature sensor 22 approaches the set temperature Ts.
In order to adjust the heating capacity of 0, the operating frequency command F for obtaining the heating capacity is sent to the frequency converter 18
To adjust the output frequency of the compressor motor 19 and thereby the rotational speed of the compressor motor 19, that is, the compressor 11. The rotation speed of the indoor fan 20 and the outdoor fan 21, that is, the air volume zone is adjusted with reference to the operating frequency command F and the like.

The control of the room temperature performed by the control device 25 as its basic function is performed by controlling the room temperature Ta and the set temperature Ts.
And ΔT = Ta −Ts, with hysteresis depending on the value of the difference ΔT = Ta −Ts. Specific values of the frequency command F (Hz) in the illustrated example are as follows.

In the process of increasing the temperature difference ΔT, that is, the indoor temperature Ta, ΔT <−2.5 ... F = 120 −2.5 ≦ ΔT <−2.0 ... F = 100 −2.0 ≦ ΔT <−1. 5 F = 80 −1.5 ≦ ΔT <−1.0 F = 60 −1.0 ≦ ΔT <−0.5 F = 35 −0.5 ≦ ΔT <0.0 F = 200 .0 ≦ ΔT <0.5 ... F = 15 0.5 ≦ ΔT <1.0 ... F = 10 ΔT ≧ 1.0 ... F = 0 In the descending process of the temperature difference ΔT (or the indoor temperature Ta), ΔT> 0.5 ... F = 0 0.0 <ΔT ≦ 0.5 ... F = 10 −0.5 <ΔT ≦ 0.0 ... F = 15 −1.0 <ΔT ≦ −0.5 ... F = 20 − 1.5 <ΔT ≦ −1.0 ... F = 35 −2.0 <ΔT ≦ −1.5 ... F = 60 −2.5 <ΔT ≦ −2.0 ... F = 80 −3.0 <ΔT ≦ −2.5 F = 100 ΔT ≦ −3 .. F = 120 The rotation speed of the outdoor fan 21, that is, the air volume or the air volume zone is set by the control device 25 based on the outdoor fan air volume command Ho according to the frequency command F in accordance with a known control method.

In the present invention, the set air volume Hi of the air blown from the indoor fan 20 is basically a function of the blowout temperature Td from the indoor heat exchanger 13 and the body surface temperature Te of the person in the room. Set. Therefore, the method of setting the rotation speed of the indoor fan 20, that is, the setting of the air volume or the air volume zone is the most important feature of the present invention, and a specific example thereof will be described below with reference to FIGS. 1 and 4.

The temperature of the air blown out by the indoor heat exchanger 13 and blown out through the indoor fan 20, that is, the blowing temperature Td, is experimentally estimated as a function of the indoor heat exchanger temperature Tc and the set blowing air amount Hi. It shall be. An accurate value can be obtained by detecting the actual value while the balloon is being blown. The blowing temperature when the blowing is started from the state where the blowing is not performed can be estimated based on the data obtained by the actual machine. However, since the indoor heat exchanger 13 is generally provided with a temperature sensor for detecting the temperature of the indoor heat exchanger, even if the blowout temperature is estimated using this, a result that is substantially the same can be obtained. .. In the embodiment described here, according to this idea, the blowing temperature T
It is assumed that d is estimated from the indoor heat exchanger temperature Tc and the blown air amount, and the blown air amount of the indoor fan 20 is "light wind".
The blowout temperature Td of the air blown out from the indoor fan 20 at that time is substantially equal to the indoor heat exchanger temperature Tc when the set blowout air amount Hi is "light wind".
Hereafter, it is considered that the temperature becomes lower than the indoor heat exchanger temperature Tc by 2 ° C. in accordance with “light wind”, “medium wind”, and “strong wind”. That is, when Hi = "light wind" ... Td = Tc (1) When Hi = "weak wind" ... Td = Tc -2 ... (2) When Hi = "medium wind" ... Td = Tc -4 ... ( 3) When Hi = “strong wind” ... Td = Tc−6 (4) It is conceivable that the body surface temperature Te of the occupant in the room may be directly detected by, for example, an infrared sensor, but in this embodiment, the room temperature Ta and It shall be estimated from the body temperature Tf of the occupant. The body surface temperature Te of the occupant is calculated according to the following formula: Te = {(α · Ta) + (β · Tf)} / (α + β) (5) with α and β as constants.

If α and β are set so that α + β = 1, the equation (5) can be simplified as follows.

Te = α · Ta + β · Tf (6) In the formula (5) or (6), the body temperature Tf of the occupant is a fixed value of about 35 to 38 ° C., and α: β is ,
A fixed value between 4: 1 and 1: 4 is assumed.

The present invention results in the above-mentioned blow-out temperature T.
The amount of blown air Hi of the indoor fan 20 is set so as to realize the heating operation in which d is equal to or higher than the body surface temperature Te and the maximum capacity is exhibited as much as possible within the range where the condition is satisfied. In the following, as an example, in equation (6), α = β = 1/2, and Tf = 38
(° C.), the body surface temperature Te of the occupant is estimated as Te = (1/2) Ta + (1/2) × 38 = (1/2) Ta + 19 (7) Further, set temperature Ts is Ts =
A specific example of the control performed by the controller 25 will be described with reference to FIGS. 1 and 4 for the case of 25 (° C.).

When the operation of the air conditioner is started, first, the room temperature Ta detected by the temperature sensor 22 and the set temperature Ts (= 25) set by the operation unit 26 are set.
Is read (step S11). Room temperature T
The difference ΔT between a and the set temperature Ts is ΔT = Ta −Ts = Ta
-25, and the operating frequency F of the compressor 11 (that is, the compressor motor 19) is determined based on the calculated value according to the setting characteristics of FIG. 3, and this is sent to the frequency converter 18 as an output frequency command (step S12).

Next, the blow rate Hi of the indoor fan 23 is set as follows. Room temperature Ta and set temperature T
The relation with s is Ta ≧ Ts +2 (that is, Ta ≧ 2
Check if 7), and if "YES",
Since it is considered that problems such as chills do not occur, the air flow rate Hi of the indoor fan 23 is unconditionally set to the A zone (strong wind) (FIG. 4: Ta ≧ Ts +2 region, that is, the right region of the straight line 42). ) (Step S14). If “NO” in the step S13, it is checked whether or not Tc ≧ Ts = 25 (step S15). If "YES" here, then Tc ≥ (1/2) Ta +
It is checked whether it is 24 (step S1)
6). If the check result is "YES", the blown air amount Hi is set to the A zone (strong wind) (step S1).
4). At this time, the blowing temperature Td is Td = Tc-6 according to the equation (4), and the body surface temperature Te of the person in the room is estimated to be Te = (1/2) Ta + 19 according to the equation (7). Here, if Td ≧ Te, then Tc−6 ≧ (1/2) Ta + 19 Tc ≧ (1/2) Ta + 25 (8), and the area above the straight line 44 in FIG. 4 is this area.

The check result in step S16 is "N".
If it is "O", it is checked whether or not Tc≥ (1/2) Ta + 22 (step S17). If it is "YES", the blown air amount Hi is set to the B zone (medium wind) (step S18). At this time, the outlet temperature Td is Td = Tc -4 according to the equation (3), where Td ≥Te, Tc -4 ≥ (1/2) Ta +19 Tc ≥ (1/2) Ta. +23 (9), and this region is below the straight line 44 (not including the straight line 44) and above the straight line 45 in FIG.

The check result in step S17 is "N."
If it is "O", it is checked whether Tc≥ (1/2) Ta + 20 (step S19). Here, "YE".
If S ″, the blown air amount Hi is set to the C zone (weak air) (step S20). At this time, the blowout temperature Td is Td = Tc −2 according to the equation (2). Here, T
If d ≥Te, then Tc -2 ≥ (1/2) Ta +19 Tc ≥ (1/2) Ta +21 (10), which is a straight line below the straight line 45 in Fig. 4 (not including the straight line 45). The area above 46 is this area.

The check result in step S19 is "N".
If it is O ", the blown air amount Hi is set to the D zone (light wind) (step S21). At this time, the blowing temperature Td is Td = Tc according to the equation (1). Here, Td ≥
Speaking of Te, Tc ≧ (1/2) Ta + 19 (11), and this region is below the straight line 46 (not including the straight line 46) and above the straight line 47 in FIG.

The check result in step S15 is "N".
If O ″, Ta ≧ Ts, that is, ΔT =
It is checked whether Ta-Ts ≧ 0 (step S22). If "YES" here, the blown air amount Hi is set to the D zone (light wind) (step S21). This is a region to the left of the straight line 42 (not including the straight line 42) and to the right of the straight line 41 in FIG.

The check result in step S22 is "N".
If it is O ", the blown air amount Hi is set to the E zone (stop) (step S23). This is the straight line 41 in FIG.
Is an area on the left side (not including the straight line 41). It should be noted that this area is provided because the feeling of cold air is stronger than during operation when low-temperature air is immediately blown out at the start of heating operation,
Although the straight line 43 has the same value as the set temperature in the present embodiment, it may have a value near the set temperature.

With the above, one cycle is completed and the next cycle is started again.

By maintaining the temperature of the air blown from the indoor unit above the body surface temperature of the person in the room as described above, it is possible to prevent the situation in which the person in the room feels uncomfortable such as chill. Within that range, the air volume as large as possible can be obtained to quickly and uniformly warm the room.

[0029]

As described above, according to the present invention, the temperature of the air blown out from the air conditioner is not too low and the person in the room does not feel uncomfortable such as chill, and within the range. As a result, the maximum air volume can be exerted, the operating efficiency of the air conditioner can be improved, and the room can be warmed quickly and uniformly.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining the operation of a control device for an air conditioner configured according to an embodiment of the present invention.

FIG. 2 is a block diagram of an air conditioner control device configured according to an embodiment of the present invention.

3 is a characteristic diagram showing the relationship between the difference between the indoor temperature and the set temperature and the operating frequency of the compressor in the control device of FIG.

FIG. 4 is a graph showing a setting characteristic of the amount of air blown from the indoor unit according to the flowchart of FIG.

FIG. 5 is a graph showing a setting characteristic of an amount of air blown from an indoor unit according to a control device for a conventional air conditioner.

[Explanation of symbols]

 10 Refrigeration cycle 11 Compressor (CP) 12 Four-way valve 13 Indoor heat exchanger 14 Expansion valve 15 Outdoor heat exchanger 16 Room to be heated 17 AC power supply 18 Frequency converter 19 Compressor motor (CM) 20 Indoor fan 21 Outdoor fan 22 Temperature Sensor 23 Temperature sensor 25 Control device 26 Operation unit

Claims (1)

Claim: What is claimed is: 1. A control device for a heat pump type air conditioner that is operated by heating, comprising a means for controlling blown air from the indoor unit so that the indoor temperature approaches a set temperature.
The first temperature detecting means for detecting the temperature of the blowing air, the second temperature detecting means for detecting the body surface temperature of the person in the room, and the temperature of the blowing air detected by the first temperature detecting means are The indoor unit air volume control means for calculating the air volume of the indoor unit which does not fall below the body surface temperature of the person in the room detected by the second temperature detecting means and blowing out the air volume obtained as a result is provided. An air conditioner control device characterized by the above. 2. The second temperature detecting means measures the room temperature by T
a, the body temperature of the occupant is Tf, and α and β are constants, and the body surface temperature Te of the occupant is calculated by the following equation: Te = {(α · Ta) + (β · Tf)} / (α + β) The air conditioner control device according to claim 1, wherein the control device detects the air conditioner by estimation. 3. A third temperature detecting means for detecting a temperature of an indoor heat exchanger included in the indoor unit, and a temperature of the indoor heat exchanger detected by the third temperature detecting means as the set temperature. In comparison, when the temperature of the indoor heat exchanger is lower than the preset temperature by a predetermined value or more, an air flow rate zero control unit that controls the air flow rate from the indoor unit to zero is provided. Air conditioner control device. 4. Comparing the room temperature and the set temperature,
4. The control device for an air conditioner according to claim 3, further comprising means for canceling the control of the blown-out air volume zero by the air volume zero control means when the room temperature has reached a set temperature. 5. A heat pump type air conditioner control device for heating operation, comprising a means for controlling blown air from the indoor unit so that the indoor temperature approaches a set temperature.
Temperature detection means for detecting the temperature of the blown air, blowout temperature setting means for setting the minimum temperature of the blown air detected by the temperature detection means so as to have a linear increasing function relationship with respect to the indoor temperature, and the blowout An air conditioner control device comprising: an indoor unit air volume control unit that controls the amount of air blown from the indoor unit so that the minimum temperature of the blown air set by the temperature setting unit is achieved. 6. A second temperature detecting means for detecting a temperature of an indoor heat exchanger included in the indoor unit, and a temperature of the indoor heat exchanger detected by the second temperature detecting means as the set temperature. In comparison, when the temperature of the indoor heat exchanger is lower than the preset temperature by a predetermined value or more, the apparatus is provided with an air volume zero control unit that controls the air volume discharged from the indoor unit to zero. Control device for air conditioner. 7. The indoor temperature and the set temperature are compared,
7. The control device for an air conditioner according to claim 6, further comprising means for canceling the control of the blown-out air volume zero by the air volume zero control means when the room temperature has reached a set temperature.