JP4479111B2 - Air conditioner and control method of air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner that detects return temperature, blowout temperature, indoor set temperature, outside air temperature, etc., and changes the opening degree of the outside air intake damper and the return damper accordingly, so-called economizer operation. It is.
[0002]
[Prior art]
Examples of conventional economizer control include those described in Japanese Utility Model Publication No. 2-64841.
In this economizer control, return air is supplied upward from the bottom of the unit through the return air damper, ambient air is supplied from the side of the unit through the economizer damper, and the air temperature is detected by the mixed air thermostat. In the area, the air is mixed, flows through the gaps in the coil tubes of the indoor heat exchanger, flows to the indoor fan, and is supplied to the enclosed area through the bottom of the unit as conditioned supply air from below.
[0003]
[Problems to be solved by the invention]
However, in the conventional economizer control, the opening selection of both dampers is corrected at a fixed time.Therefore, although there is an initial setting function, there is no follow-up capability for subsequent load fluctuations and much time is required for operating the compressor. As a result, there was a problem that the energy saving effect could not be fully exhibited.
[0004]
The present invention has been made to solve the above-described problems. The economizer operation time is reduced by detecting the temperature of the return air and adjusting the opening of the outside air intake damper and the return damper according to this value. It aims at providing the air conditioner which can be lengthened and can increase an energy-saving effect, and a control method.
[0005]
[Means for Solving the Problems]
The air conditioner according to the present invention includes a compressor, a cooler, an outside air intake damper that takes in air from the outside, a return damper that takes in air from the room, and a duct for supplying air that has passed through the cooler into the room. And a control means for controlling the operation of the compressor, the outside air intake damper, and the return damper, and when the value obtained by subtracting the temperature of the outside air from the indoor set temperature exceeds a predetermined value, The damper opening of the outside air intake damper and the damper opening of the return damper are adjusted at regular intervals without operating the compressor.
[0006]
Further, the control means adjusts so that the sum of the damper opening degree of the outside air intake damper and the damper opening degree of the return damper becomes constant.
[0007]
Further, the predetermined value is 10 ° C. deg.
[0008]
Further, in the present invention, a compressor, a cooler, an outside air intake damper that takes in air from the outside, a return damper that takes in air from the room, a duct for supplying air that has passed through the cooler into the room, and a compression The control method of the air conditioner having the control means for controlling the operation of the machine, the outside air intake damper, the return damper,
First step of determining whether or not the value obtained by subtracting the temperature of the outside air from the indoor set temperature exceeds a predetermined value when the return temperature of the air taken in from the return damper exceeds the indoor set temperature When,
If it is determined in the first step that it exceeds a predetermined value, the second step of opening the outside air intake damper and operating the return damper without operating the compressor;
If the current return temperature is higher than the return temperature before the lapse of a certain time, increase the damper opening of the outside air intake damper and decrease the return damper's damper opening to reduce the current return temperature. Is lower than the return temperature before the lapse of a certain time, the third step is to increase the damper opening of the return damper while decreasing the damper opening of the outside air intake damper.
[0009]
Further, if it is determined in the first step that the predetermined value is not exceeded, the fourth step of fully opening the outside air intake damper and fully closing the return damper, and the room setting from the current return temperature. A fifth step of operating the compressor when the value obtained by subtracting the temperature exceeds a predetermined second value and stopping the compressor when not exceeding the predetermined second value is provided.
[0010]
Furthermore, the sum of the damper opening of the outside air damper and the damper opening of the return damper is assumed to be constant.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing the configuration of the rooftop air conditioner according to the first embodiment.
In the figure, the rooftop type air conditioner 1 is divided into an outdoor side 10 and an indoor side 20 by a central partition plate 2. The outdoor side 10 includes an outdoor heat exchanger 11, a first compressor 12 a and a second compressor 12 b, an outdoor fan motor 13, and an outdoor fan 14 that is rotated by the outdoor fan motor 13.
[0012]
In addition, the indoor unit 20 has a cooler 21, an indoor fan motor 22, a motor pulley 23 fixed to the indoor fan motor 22 so that the rotational axis thereof coincides, an indoor blower 24, and the indoor blower 24 and the rotational axis thereof. The fan pulley 25 fixed in this manner, the belt 26 stretched over both the motor pulley 23 and the fan pulley 25, the duct box 27 for discharging the air that has passed through the cooler 21 into the room, and the return air from the room A return damper 28 provided on the lower surface for intake, a return damper drive unit 29 for driving the return damper 28, an outside air intake damper 30 provided on the side surface for taking in air from the outside, and the outside air intake damper An outside air intake damper driving unit 31 for driving 30 and a rainwater-preventing hood 32 are provided. Furthermore, the rooftop type air conditioner 1 has control means for performing overall operation control, and this control means is connected to a parameter input means (not shown) arranged indoors by a cable. The user can set the room temperature and the wind direction from the parameter input means.
[0013]
In such a rooftop type air conditioner 1, when both the return damper 28 and the outside air intake damper 30 are open, return air from the room (Return air in FIG. 1) passes through the return damper 28. The inside air 20 is supplied, and outside air (Fresh air in FIG. 1) is supplied from the outside air intake damper 30 to the indoor side 20. Both of these airs are mixed and flow to the indoor blower 24 through the cooler 21 and are supplied to the room through the duct box 27 as blown air (Supply air in FIG. 1).
[0014]
Next, control means for performing overall control of the rooftop type air conditioner 1 will be described based on the circuit configuration diagram of FIG.
In FIG. 2, 50 is a microcomputer board which is a control means on which a microcomputer is mounted.
The microcomputer board 50 includes an outside air temperature detection thermistor 51 that detects the outside air temperature (Tout), a return temperature detection thermistor 52 that detects the return air temperature (T0, T1), and an outlet temperature detection thermistor that detects the outlet temperature (T2). 53.
[0015]
The microcomputer board 50 is connected to terminals of an outside air intake damper drive motor 31 a provided in the outside air intake damper drive unit 31 and a return damper drive motor 29 a provided in the return damper drive unit 29. The return damper drive motor 29a is inverted from the outside air intake damper drive motor 31a to obtain a signal. More specifically, the terminal A located at one end of the resistor 54 is in the intake damper drive motor 31a, the terminal C located in the other end of the resistor 54 is in the return damper drive motor 29a, and in the middle of the resistor 56. The intake damper drive motor 31a and the return damper drive motor 29a are connected to a terminal B that is positioned and movable to the left and right. The position of the terminal B is controlled by the microcomputer based on the outside air temperature, the return temperature, and the blowing temperature.
[0016]
When the resistance value between AB is R1, the resistance value between BC is R2, and the resistance value between AC is R,
R = R1 + R2
Further, the opening degree of the damper is proportional to the resistance values R1 and R2.
That is, when R1 = R and R2 = 0 by the movement of the terminal B, the outside air intake damper drive motor 31a sets the opening degree of the outside air intake damper 30 to 100%, and the return damper drive motor 29a sets the opening degree of the return damper 28 to 0%. In addition, when R1 = 0.3R and R2 = 0.7R, the outside air intake damper drive motor 31a sets the opening degree of the outside air intake damper 30 to 30%, and the return damper drive motor 29a sets the opening degree of the return damper 28 to 70%. %.
[0017]
Further, the microcomputer board 50 includes an indoor fan motor electromagnetic contactor relay 55 that activates the indoor fan motor electromagnetic contactor 60 and a first compressor electromagnetic that activates the first compressor electromagnetic contactor 61. A contactor relay 56 and a second compressor electromagnetic contactor relay 57 that activates the second compressor electromagnetic contactor 62 are provided.
Reference numeral 58 denotes an operation switch of the rooftop type air conditioner 1, and 59 denotes a transformer.
[0018]
Next, the operation of the rooftop type air conditioner 1 having the configuration shown in FIGS. 1 and 2 will be described based on the flowchart of FIG.
First, when the operation switch 58 is turned on, the indoor fan motor electromagnetic contactor relay 55 is excited, the contact a is turned on, the indoor fan motor electromagnetic contactor 60 is turned on, and the indoor blower 24 is rotated (step (hereinafter referred to as “step”). “S”) 1).
[0019]
Next, the identifier A is set to 0, R1 = 0, R2 = R, the outside air intake damper 30 is fully closed, and the return damper 28 is fully opened (S2).
Next, it is determined whether or not the current return temperature (T1) exceeds the indoor set temperature (Ts) (S3).
If it is determined in S3 that the current return temperature (T1) is equal to or lower than the indoor set temperature (Ts), it is not necessary to cool the air, so the first compressor 12a and the second compressor 12b are turned off, The outside air intake damper 30 is fully closed and the return damper 28 is fully opened (S4).
[0020]
When it is determined in S3 that the current return temperature (T1) exceeds the indoor set temperature (Ts), the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is 0 or less, 0 to 10 It is determined whether it corresponds to 10 or more (S5). Note that if the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) exceeds 0, it is a case where the cooling efficiency is improved by using the outside air.
In S5, when the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is determined to be 10 or more, it is determined whether or not the identifier A is 0 (S6). The outside air temperature (Tout) and the current return temperature (T1) are detected, and the difference between the return temperature (T1) corresponding to the required cooling capacity of 100% and the blowing temperature (Supply air temperature: T2 in FIG. 1) is 10 ° C. The resistance values R1 and R2 of the outside air intake damper drive motor 31a and the outside air intake damper drive motor 29a are adjusted so as to become (S7), and the damper opening degrees f (Xo) and g (Xo) are based on the resistance values R1 and R2. ) Is determined, and the return damper 28 and the outside air intake damper 30 are opened (S8). If it is determined in S6 that the identifier is not 0, that is, it is 1, the opening adjustments of the return damper 28 and the outside air intake damper 30 have already been adjusted, so S7 to S8 are skipped.
[0021]
Next, after waiting for 5 minutes (S9), the current return temperature (T1) is detected, and it is determined whether or not the difference from the return temperature (T0) 5 minutes ago exceeds 0 (S10). If the difference is determined to be greater than 0 in S10, the return temperature has risen from 5 minutes before and the cooling supply is insufficient, so that the outside air intake damper 30 is further opened by ΔX. And the opening degree of the return damper 28 is decreased by ΔX (S11).
[0022]
Next, it is determined whether or not the difference between the indoor set temperature (Ts) and the current return temperature (T1) is less than 1 ° C. (S12). If it is determined that the difference is less than 1 ° C., 5 minutes have passed (S13). ) After that, it is determined again whether the difference between the indoor set temperature (Ts) and the current return temperature (T1) is less than 1 ° C. (S14). If it is determined that it is less than 1 ° C., the process returns to S13. This makes it possible to maintain a state close to the set temperature.
If it is determined in S12 and S14 that the temperature is 1 ° C. or higher, 1 is set in the identifier A (S15), and the process returns to S3.
[0023]
If the difference is determined to be 0 or less in S10, the return temperature is lower than 5 minutes ago and the cooling supply is large. Therefore, the outside air intake damper 30 is lowered by ΔX minutes, the return is The opening degree of the damper 28 is increased by ΔX (S16).
[0024]
Next, it is determined whether the difference between the indoor set temperature (Ts) and the current return temperature (T1) is less than 1 ° C. (S17). If it is determined that the difference is less than 1 ° C., 5 minutes have passed (S18). ) After that, it is determined again whether the difference between the indoor set temperature (Ts) and the current return temperature (T1) is less than 1 ° C. (S19). If it is determined that it is less than 1 ° C., the process returns to S18.
If it is determined in S17 and S19 that the temperature is 1 ° C. or higher, 1 is set in the identifier A (S15), and the process returns to S3.
[0025]
When it is determined in S5 that the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is between 0 and 10, the outside air intake damper 30 is fully opened and the return damper 28 is fully closed (S20). ). Next, it is determined whether or not the current return temperature (T1) exceeds a value obtained by adding 2 ° C. to the set temperature (Ts) (S21). If not, the first compressor 12a is started (S22). In addition, when it determines with not exceeding in S21, the 1st compressor 12a is stopped noting that sufficient cooling can be performed only with external air (S23).
[0026]
If it is determined in S5 that the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is 0 or less, first, the outside air damper is fully closed and the return damper is fully opened (S24), and the second compression is performed. The machine 12b is activated (S25). Next, it is determined whether or not the current return temperature (T1) exceeds a value obtained by adding 2 ° C. to the set temperature (Ts) (S26), and if it is determined that it exceeds, only the second compressor 12b is determined. Then, assuming that sufficient cooling cannot be performed, the first compressor 12a is started (S27).
[0027]
When S4, S22, S23, and S26 are executed, and when it is determined that the value does not exceed S25, the identifier A is set to 0 (S28) and the process returns to S3.
[0028]
Next, as an example in accordance with the flowchart of FIG. 3, FIG. 4 shows the relationship between the outside air temperature and the outside air introduction rate, and FIG. 5 shows the relationship between the outside air temperature and the operation of the first compressor and the second compressor. Shown in
Here, the set temperature is 25 ° C.
When the outside air temperature is 15 ° C. or lower, S6 and the subsequent steps are performed. Therefore, the outside air intake damper 30 and the return damper 28 are opened without operating the first compressor 12a and the second compressor 12b. Cooling is performed by finely controlling the degree following the load.
[0029]
When the outside air temperature is between 15 ° C. and 25 ° C., S20 and subsequent steps will be performed, so that the outside air intake damper 30 is fully opened and the first compressor is operated according to the load to perform the combined operation. .
[0030]
When the outside air temperature is 25 ° C. or higher, S24 and the subsequent steps are performed. Therefore, the outside air intake damper 30 is fully closed, the return damper 28 is fully opened, and the second compressor 12b is operated. Furthermore, the first compressor is also operated according to the load.
[0031]
As described above, in this embodiment, when the outside air temperature is significantly lower than the set temperature, the compressor is not operated and the outside air intake damper and the return damper are operated with fine control. If it is not so large, fine control such as operating the compressor is performed, so that the energy saving effect can be greatly improved.
[0032]
In addition, the determination as to whether or not to start the compressor is made possible by making the difference between the indoor set temperature and the outside air temperature about 10 ° C. as a guideline.
In this embodiment, the outside air intake damper 30 is fully closed and the return damper 28 is fully opened in S24. However, this is not necessarily required, and the opening degree of the outside air intake damper 30 is minimized. It may be configured to.
[0033]
Embodiment 2. FIG.
In the first embodiment, two compressors are used, but the same effect can be obtained even when there is only one compressor.
FIG. 6 is a flowchart showing the operation of the rooftop type air conditioner in the case of one compressor. In addition, about the structure of a rooftop type | mold air conditioner, since only one compressor is included among the rooftop type | mold air conditioners shown in FIG. 1, description is abbreviate | omitted.
[0034]
6 differs from FIG. 3 in that the operation is different when the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is less than 10 in S5.
First, when it is determined that the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is between 0 and 10, the outside air intake damper 30 is fully opened and the return damper 28 is fully closed (S20). Next, it is determined whether or not the current return temperature (T1) exceeds a value obtained by adding 2 ° C. to the set temperature (Ts) (S21). If not, the compressor is started (S30). In addition, when it determines with not exceeding in S30, a 1st compressor is stopped noting that sufficient cooling can be performed only with external air (S31).
[0035]
When it is determined in S5 that the difference between the indoor set temperature (Ts) and the outside air temperature (Tout) is 0 or less, first, the outside air intake damper 30 is fully closed and the return damper 28 is fully opened (S24). The compressor is started (S32).
As described above, even when only one compressor is used, the energy saving effect can be greatly improved as in the case of the first embodiment.
[0036]
【The invention's effect】
As described above, in the present invention, the operation for finely controlling the outside air intake damper and the return damper without operating the compressor and the operation for operating the compressor are finely controlled according to the outside air temperature. Energy saving effect can be improved.
Further, the determination as to whether or not to start the compressor is made possible by making the difference between the indoor set temperature and the outside air temperature about 10 ° C. as a guideline.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of a rooftop type air conditioner according to a first embodiment.
FIG. 2 is a circuit configuration diagram.
FIG. 3 is a flowchart showing the operation of the rooftop type air conditioner in the first embodiment.
FIG. 4 is a relationship diagram showing a relationship between an outside air temperature and an outside air introduction rate.
FIG. 5 is a relational diagram showing the relation of operation of the first compressor and the second compressor at the outside air temperature.
FIG. 6 is a flowchart showing the operation of the rooftop type air conditioner in the second embodiment.
[Explanation of symbols]
1 rooftop type air conditioner, 2 partition plate, 10 outdoor side,
11 outdoor heat exchanger, 12a 1st compressor, 12b 2nd compressor,
13 outdoor fan motor, 14 outdoor fan, 20 indoor side,
21 cooler, 22 indoor fan motor, 23 motor pulley,
24 indoor blower, 25 blower pulley, 26 belt,
27 Duct box, 28 Return damper,
29 return damper drive unit, 29a return damper drive motor,
30 outside air intake damper, 31 outside air intake damper drive unit,
31a External air intake damper drive motor, 32 Hood,
50 microcomputer board, 51 outside temperature detection thermistor,
52 Return temperature detection thermistor, 53 Outlet temperature detection thermistor,
54 resistors, 55 electromagnetic contactor relays for indoor fan motors,
56 1st electromagnetic contactor relay for compressors,
57 second electromagnetic contactor relay for compressor, 58 operation switch,
59 transformer, 60 indoor fan motor electromagnetic contactor,
61 1st electromagnetic contactor for compressors, 62 electromagnetic contactors for compressors.

Claims (6)

A compressor, a cooler, an outside air intake damper for taking in air from outside, a return damper for taking in air from the room, a duct for supplying air that has passed through the cooler into the room, the compressor, In the air conditioner having an outside air intake damper and a control means for controlling the operation of the return damper, the control means is configured such that the value obtained by subtracting the temperature of the outside air from the indoor set temperature exceeds a predetermined value. Without operating the compressor , if the current return temperature is higher than the return temperature before elapse of a certain time at regular intervals, increasing the damper opening of the outside air intake damper, If the damper opening of the return damper is reduced and the current return temperature is lower than the return temperature before a certain time has elapsed, The intake accompanied Reducing the damper opening degree of the damper, an air conditioner and performs the control to increase the damper opening degree of the return damper. The air conditioner according to claim 1, wherein the control means adjusts so that a sum of a damper opening degree of the outside air intake damper and a damper opening degree of the return damper becomes constant. The air conditioner according to claim 1 or 2, wherein the predetermined value is 10 ° C deg. A compressor, a cooler, an outside air intake damper for taking in air from outside, a return damper for taking in air from the room, a duct for supplying air that has passed through the cooler into the room, the compressor, In the control method of the air conditioner having the outside air intake damper and the control means for controlling the operation of the return damper,
When the return temperature of the air taken in from the return damper exceeds the indoor set temperature, it is determined whether or not a value obtained by subtracting the temperature of the outside air from the indoor set temperature exceeds a predetermined value. 1 step,
A second step of opening the return damper and opening the outside air intake damper without operating a compressor if it is determined that the predetermined value is exceeded in the first step;
If the current return temperature is higher than the return temperature before the lapse of a certain time after the lapse of a certain time, the damper opening of the return damper is decreased with increasing the damper opening of the outside air intake damper, When the current return temperature is lower than the return temperature before the lapse of a predetermined time, a third step of decreasing the damper opening of the outside air intake damper and increasing the damper opening of the return damper; A control method for an air conditioner, comprising: If it is determined that the predetermined value is not exceeded in the first step, a fourth step of fully opening the outside air intake damper and fully closing the return damper;
A fifth step of operating the compressor if the value obtained by subtracting the indoor set temperature from the current return temperature exceeds a predetermined second value, and stopping the compressor if not exceeding The method of controlling an air conditioner according to claim 4. 6. The method of controlling an air conditioner according to claim 4, wherein the sum of the damper opening degree of the outside air damper and the damper opening degree of the return damper is constant.

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