JP3768141B2 - Air conditioner dry operation control method and air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dry operation control method and an air conditioner for an air conditioner in which a part of an indoor heat exchanger is used as a reheater and the rest is used as an evaporator to enable dry operation.
[0002]
[Prior art]
In general, an air conditioner having a compressor, an outdoor heat exchanger, a decompression device, and an indoor heat exchanger capable of controlling the operation frequency is known.
[0003]
In this type, the indoor heat exchanger described above is divided into, for example, three heat exchange units, and the two heat exchange units function as an evaporator, while the remaining one heat exchange unit functions as a reheater. In addition, there has been proposed one that enables full-scale dry operation in which air that has been cooled and dehumidified is heated and blown indoors.
[0004]
Conventionally, in the above-mentioned full-scale dry operation, a correction value for the compressor operating frequency is calculated based on the deviation between the set temperature and room temperature, and the target operating frequency of the compressor is determined from this correction value to control the compressor. It is carried out by doing.
[0005]
[Problems to be solved by the invention]
In such a full-scale dry operation, since the cooled and dehumidified air is heated, the room temperature does not decrease, but the dehumidification is not necessarily sufficient.
[0006]
That is, in the conventional full-scale dry operation, although the room temperature is controlled but the humidity is not managed, the amount of dehumidification and the dehumidification speed may be insufficient, and comfortable dehumidification may not be realized.
[0007]
The object of the present invention has been made in consideration of the above-mentioned circumstances, and can perform dehumidification well without lowering the room temperature, and in particular, an air conditioner that can perform dehumidification well according to the user's preference. An object of the present invention is to provide a dry operation control method and an air conditioner.
[0008]
Another object of the present invention is to provide an air conditioner dry operation control method and an air conditioner that can reduce energy consumption during dry operation.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 has a compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger whose operation frequency can be controlled. A part of the indoor heat exchanger is used as a reheater, and the rest is used. In the dry operation control method of the air conditioner that performs the dry operation by controlling the operation frequency of the compressor as well as the evaporator, the deviation between the target dew point and the current dew point for each predetermined time of the dry operation , and From the difference between this deviation and the previously calculated deviation, a correction value for the operating frequency of the compressor is calculated by fuzzy calculation, and a value obtained by multiplying the correction value by a gain is added to the current operating frequency of the compressor. Te determines a target operating frequency of the compressor to control the compressor based on the target operating frequency, during the operation start of the dry operation, the target dew point and a value obtained by multiplying a gain to the difference between the current dew point, Indoor humidity The target operating frequency of the compressor is determined by adding a constant corresponding to the load, and the compressor is controlled based on the target operating frequency, and a target humidity selection branch is provided in advance, and is used from this selection branch. The target humidity for calculating the target dew point is changed and set to the target humidity selected by the person .
[0013]
The invention of claim 2 is the invention according to claim 1, the target humidity, human standing in the room, is characterized in that the set further changed according to the absence.
[0014]
The invention according to claim 3 has a compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger whose operation frequency can be controlled, and a part of the indoor heat exchanger is a reheater, and the rest is In the air conditioner capable of performing the dry operation by controlling the operation frequency of the compressor with the evaporator, the control device has a target dew point and a current dew point every predetermined time of the dry operation. And a difference between this deviation and the previously calculated deviation, a correction value of the operating frequency of the compressor is calculated by fuzzy calculation, and a value obtained by multiplying the correction value by a gain is used as the current value of the compressor. The target operating frequency of the compressor is determined by adding to the operating frequency, the compressor is controlled based on the target operating frequency, and a gain is added to the deviation between the target dew point and the current dew point at the start of the dry operation. Multiplied by the value A target operating frequency of the compressor is determined by adding a constant corresponding to the humidity load in the room, the compressor is controlled based on the target operating frequency, and a target humidity selection branch is provided in advance. The target humidity for calculating the target dew point can be changed and set to the target humidity selected by the user .
[0018]
According to a fourth aspect of the present invention, in the third aspect of the invention, the target humidity is configured to be further changed and set according to the presence or absence of a person in the room. It is.
[0019]
The inventions according to claims 1 to 4 have the following effects.
[0020]
Calculates the correction value of the compressor operating frequency based on the deviation between the target dew point and the current dew point every predetermined time of dry operation, determines the target operating frequency of the compressor from this correction value, and controls the compressor Therefore, the present dew point can be reached to the target dew point, and this reached state can be maintained, so that dew condensation can always occur and good dehumidification can be realized. As a result, the dehumidification speed and dehumidification amount can be improved, and the dehumidification can be carried out satisfactorily.
[0021]
Moreover, since a part of the indoor heat exchanger is used as a reheater and the rest is used as an evaporator to perform a dry operation, the air cooled and dehumidified by the evaporator is heated by the reheater. Can be prevented.
[0022]
Furthermore, since the target humidity for calculating the target dew point is changed and set, when this target humidity is changed according to the user's preference, the humidity of the dry operation is set to the user's desired humidity. Therefore, dehumidification can be favorably performed according to the user's preference. In addition, when the target humidity is changed according to the presence or absence of a person in the room, compression is performed by setting the target humidity higher than when the person is present in the room when no person is present. Since the target operation frequency of the machine can be lowered, the energy consumption of the air conditioner can be reduced in the dry operation when no person is present in the room.
[0024]
Since the target operating frequency of the compressor is determined by adding the correction value of the operating frequency of the compressor to the current operating frequency of the compressor, the continuity to the target operating frequency with respect to the current operating frequency of the compressor Can be given.
[0026]
At the start of dry operation, the target operating frequency of the compressor is determined by adding a constant corresponding to the humidity load in the room to the value obtained by multiplying the deviation between the target dew point and the current dew point by a gain. The operating frequency of the compressor can be changed according to the magnitude of the load, and the dehumidifying speed and dehumidifying amount can be adjusted.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028]
FIG. 1 is a system diagram of an air conditioner including a cross-sectional view of an indoor unit. The indoor unit 1 is connected to an outdoor unit 11 having a compressor 12, an outdoor heat exchanger 13 and a decompression device 14 that can control the operating frequency, and an inter-unit pipe 16 to constitute an air conditioner 10. .
[0029]
The case of the indoor unit 1 includes a front case part 2A on the front side, a suction panel 2B provided at the front part of the front case part 2A and provided with an air inlet for indoor air, and a rear case part 2c on the back side. It consists of and. In this case, the indoor heat exchanger 4 that heats / cools / dehumidifies the indoor air and the indoor air is sucked from the intake port of the suction panel 2B, and is heated / cooled / dehumidified by the indoor heat exchanger 4 again. A blower fan 5 that is circulated in the room, an air filter 7 that removes relatively large dust in the indoor air sucked by the blower fan 5, and a relatively fine dust in indoor air that has passed through the air filter 7 is further removed. An air purifying filter 8 is provided.
[0030]
Reference numeral 6 denotes a drain pan. A cool air / warm air outlet 9 is formed below the drain pan 6. The air outlet 9 is provided with an up / down air direction changing blade 9A and a left / right air direction changing blade 9B.
[0031]
The indoor heat exchanger 4 is divided into three heat exchange units 4A, 4B, and 4C. When the air conditioning apparatus is operated for heating, all the heat exchange units 4A, 4B, 4C function as condensers, and when operated for cooling, all the heat exchange units 4A, 4B, 4C serve as evaporators. Function.
[0032]
When the two heat exchange units 4A and 4B function as an evaporator and the remaining heat exchange unit 4C functions as a reheater, a full-scale dry operation is possible in which air that has been cooled and dehumidified is heated and blown indoors. become.
[0033]
As described above, the control device 15 of the air conditioner 10 causes the heat exchange units 4A, 4B, and 4C of the indoor heat exchanger 4 to function as a condenser during the heating operation and as an evaporator during the cooling operation. Further, the control device 15 causes the heat exchanging units 4A and 4B to function as an evaporator and the heat exchanging unit 4C to function as a reheater during full-scale dry operation. By controlling the frequency (hereinafter referred to as the operating frequency of the compressor 12), good dehumidification is realized without lowering the room temperature.
[0034]
Hereinafter, the control of the operation frequency of the compressor 12 by the control device 15 will be described in detail.
[0035]
The control device 15 calculates the target dew point and the current dew point every predetermined time (for example, 30 seconds) during the full-scale dry operation, and the operating frequency of the compressor 12 based on the dew point deviation e between the target dew point and the current dew point. The correction value U is calculated, the target operating frequency of the compressor 12 is determined from the correction value U, and the compressor 12 is controlled.
[0036]
The target dew point is calculated from the target humidity and the current indoor temperature (room temperature) or target room temperature (set room temperature). This room temperature is detected by a temperature sensor (not shown) incorporated in each of the indoor unit 1 or a remote controller (not shown).
[0037]
The target humidity can be changed and set. In other words, the target humidity is provided so that the user of the air conditioner 10 can set the humidity according to the user's preference from the following selection options by operating a remote controller (not shown). It is done. The selected branch is a target humidity of 50% (strong), 55% (standard), 60% (soft), 45% (laundry), or the like.
[0038]
The remote controller is provided with a human sensor (not shown) that detects whether a person is present in the room where the indoor unit 1 is installed. And the said target humidity is provided so that a change is possible also by the presence or absence of the person in the room detected by the human sensitive sensor. That is, based on the signal from the human sensor, the control device 15 is configured to set the target humidity about 10% higher when there is no person in the room than when there is a person. The Thereby, the target operation frequency of the compressor 12 is set low, and the energy consumption of the full-scale dry operation when a person is absent is reduced.
[0039]
The current dew point is calculated from the current indoor humidity and the current room temperature. The current room temperature is detected by the temperature sensor. The current indoor humidity is detected by a humidity sensor (not shown) incorporated in the indoor unit 1 or a remote controller (not shown).
[0040]
The operating frequency correction value U of the compressor 12 is calculated from the dew point deviation e between the target dew point and the current dew point, and the difference Δe between the current dew point deviation e and the previous dew point deviation e (for example, 30 seconds before). Is calculated every predetermined time (for example, 30 seconds). When the difference Δe between the dew point deviation e and the dew point deviation e is increased, the operating frequency correction value U is set to be large so that the dehumidification amount is increased.
[0041]
The target operating frequency of the compressor 12 is obtained by multiplying the correction value U of the operating frequency of the compressor 12 by a gain set corresponding to the capacity of the compressor 12 and multiplying this multiplied value by the current operating frequency of the compressor 12. It is calculated and determined by adding to. Thus, by adding the current operating frequency, it is considered that the target operating frequency has continuity with respect to the current operating frequency.
[0042]
Actually, the value obtained by adding the multiplied value to the current operating frequency of the compressor 12, adding a multiple of the current operating frequency to the added value, and dividing this value by the value of (multiple +1). May be determined as the target operating frequency. In this case, the target operating frequency does not change more rapidly than the current operating frequency, and more continuity is given to the current operating frequency.
[0043]
At the start of full-scale dry operation, the dew point deviation e between the target dew point and the current dew point is only this time, and there is no previous dew point deviation e. A frequency correction value U is calculated, the correction value U is multiplied by the gain, and a constant is added to the multiplication value to determine a target operating frequency. The above constant is a value corresponding to the humidity load in the room, and is 45 Hz when the room humidity is 70% or more, for example, and 0 Hz when it is less than 70%, for example.
[0044]
Next, the operation frequency control of the compressor 12 during the full-scale dry operation performed by the control device 15 will be described with reference to FIG.
[0045]
The control device 15 determines whether or not the target humidity (S1) selected and input by the user of the air conditioning apparatus 10 has been changed with respect to the target humidity that has already been set (S2).
[0046]
When the target humidity is changed in step S2, the control device 15 determines and sets the changed value as a new target humidity (S3).
[0047]
When determining that the target humidity has not been changed in step S2, the control device 15 determines whether or not there is a person in the room, for example, after a mask time of 30 seconds has elapsed (S4) or immediately after the determination in step S3. Is determined based on the detection value of the human sensor in the remote controller (S5).
[0048]
When the control device 15 determines in step S5 that no person is present in the room, the control device 15 changes and sets the already set target humidity to about 10% (S6).
[0049]
When it is determined in step S5 that a person is present in the room or after the target humidity is changed in step S6, the control device 15 obtains the detected value of the current humidity from the humidity sensor installed in the indoor unit 1 or the remote controller. Further, the detected value of the current temperature is taken in from the temperature sensor installed in the indoor unit 1 or the remote controller (S7).
[0050]
Next, the control device 15 calculates the target dew point from the target humidity and the current room temperature, and calculates the current dew point from the captured current humidity and the current room temperature (S8).
[0051]
The control device 15 calculates a dew point deviation e between the calculated target dew point and the current dew point (S9), and a difference Δe () between the current dew point deviation e and the previous dew point deviation e calculated, for example, 30 seconds ago. The difference in dew point deviation is calculated (S10).
[0052]
The control device 15 calculates a correction value U of the operating frequency of the compressor 12 from the current dew point deviation e and the difference Δe between the dew point deviation e using a fuzzy calculation (S11).
[0053]
The control device 15 determines whether or not the correction value U is calculated for the first time from the start of the full-scale dry operation (S12).
[0054]
If it is the first time, the control apparatus 15 will determine the target operating frequency of the compressor 12 using following Formula (1) (S13).
[0055]
Target operating frequency = correction value U × gain + constant (1)
Here, since the previous dew point deviation e between the target dew point and the current dew point does not exist, the correction value U is calculated by fuzzy calculation only from the current dew point deviation e. The constant is 45 Hz when the indoor humidity is, for example, 70% or more and the load of indoor humidity is high, and is 0 Hz when the indoor humidity is, for example, less than 70% and the load of indoor humidity is low.
[0056]
When it is determined that the calculation of the correction value U in step S11 is the second or subsequent time from the start of the full-scale dry operation (S12), the control device 15 determines whether the target humidity or the target room temperature has been changed. (S14).
[0057]
If there is a change such as the target humidity, the control device 15 determines the target operating frequency of the compressor 12 using the following equation (2) (S15).
[0058]
Target operating frequency = correction value U × setting change gain + current operating frequency (2)
Here, the correction value U is calculated in step S11. The setting change gain is a gain according to the capacity of the compressor 12 that is used only when the target humidity or the target room temperature is changed.
[0059]
In step S14, when there is no change in the target humidity or the like, the control device 15 determines the target operating frequency of the compressor 12 using the following equation (3) (S16).
[0060]
Target operating frequency = {(correction value U × gain + current operating frequency) + current operating frequency × 2} / 3 (3)
Here, the correction value U is calculated in step S11. Further, as in the above equation (3), the current operating frequency of the compressor 12 is added to the multiplication value of the correction value U and the gain, and twice the current operating frequency is added to the added value. By dividing the added value by “3” to obtain the target operating frequency, fluctuations in the operating frequency are minimized.
[0061]
Thereafter, the control device 15 determines whether or not the current operating frequency of the compressor 12 has a restriction such as prohibition of increase or reduction in Hz (decrease in frequency) (S17).
[0062]
When there is a restriction on the current operation frequency, the control device 15 does not adopt the target operation frequency determined in step S13, S15, or S16, and executes processing corresponding to the restriction (S18 and S19). That is, when the limitation is prohibition of the increase of the operation frequency, the current operation frequency is maintained as the final operation frequency, and in the case of Hz down, the current operation frequency is decreased by a predetermined frequency to obtain the final operation frequency. And
[0063]
In step S17, when there is no restriction on the current operation frequency, the control device 15 sets the operation frequency of the compressor 12 as the final operation frequency with the target operation frequency determined in step S13, S15, or S16 as the final operation frequency. (S19).
[0064]
The control device 15 executes the above steps S2 to S19 every predetermined time, for example, every 30 seconds.
[0065]
Since it is configured as described above, the following effects (1) to (4) are achieved according to the above embodiment.
[0066]
{Circle around (1)} The control device 15 determines the dew point deviation e between the target dew point and the current dew point and the difference Δe between the current dew point deviation e and the previous dew point deviation e every predetermined time (for example, 30 seconds) of full-scale dry operation. Is used to calculate the correction value U of the operating frequency of the compressor 12 by fuzzy calculation, and the target operating frequency of the compressor 12 is determined from the correction value U and the compressor 12 is controlled. Can be maintained and this reached state can be maintained, so that dew condensation can always occur and good dehumidification can be realized. As a result, the dehumidification speed and dehumidification amount can be improved, and the dehumidification can be carried out satisfactorily.
[0067]
(2) Since a full-scale dry operation is performed by using the heat exchanger 4C of the indoor heat exchanger 4 as a reheater and the heat exchangers 4A and 4B as an evaporator, the air cooled and dehumidified by the evaporator is reheated. Since it is heated by the vessel, a decrease in room temperature can be prevented.
[0068]
(3) Since the target humidity for calculating the target dew point is changed and set, when the target humidity is changed according to the user's preference, the humidity of the full-scale dry operation is desired by the user. Therefore, dehumidification by full-scale dry operation can be carried out satisfactorily according to the user's preference. In addition, when the control device 15 changes the target humidity according to the presence / absence of a person in the room, by setting the target humidity higher than when the person is present in the room when the person is absent, Since the target operating frequency of the compressor 12 can be lowered, the energy consumption of the air conditioner 10 can be reduced in a full-scale dry operation when there is no person in the room.
[0069]
(4) Since the correction value U of the operating frequency of the compressor 12 is added to the current operating frequency of the compressor 12 and the target operating frequency of the compressor 12 is determined, the current operating frequency of the compressor 12 is obtained. On the other hand, the target operating frequency can be made continuous.
[0070]
(5) At the start of full-scale dry operation, the target operating frequency of the compressor 12 is determined by adding a constant corresponding to the humidity load in the room to the value obtained by multiplying the dew point deviation e between the target dew point and the current dew point by a gain. Therefore, even when full-scale dry operation is started, the operating frequency of the compressor 12 can be changed according to the magnitude of the humidity load in the room, and the dehumidifying speed and dehumidifying amount can be adjusted.
[0071]
As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this.
[0072]
【The invention's effect】
According to the dry operation control method for an air conditioner according to the first or second aspect of the invention, it is possible to perform dehumidification without lowering the room temperature, and in particular, perform dehumidification according to the user's preference. it can. Further, according to the dry operation control method of the air conditioner, the energy consumption during the dry operation can be reduced.
[0073]
According to the air conditioner pertaining to the third to fourth aspects of the invention, dehumidification can be carried out satisfactorily without lowering the room temperature, and in particular, dehumidification can be carried out favorably according to the user's preference. Moreover, according to this air conditioning apparatus, energy consumption during dry operation can be reduced.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an embodiment of an air conditioner according to the present invention together with a sectional view of an indoor unit.
FIG. 2 is a flowchart of a full-scale dry operation executed by a control device in the air conditioning apparatus of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Indoor unit 4 Indoor heat exchanger 4A, 4B, 4C Heat exchange part 10 Air conditioning apparatus 12 Compressor 15 Control apparatus

Claims (4)

It has a compressor, an outdoor heat exchanger, a decompressor, and an indoor heat exchanger that can control the operating frequency.
In the dry operation control method of an air conditioner that performs a dry operation by controlling a part of the indoor heat exchanger as a reheater and the rest as an evaporator and controlling the operation frequency of the compressor,
Calculate the correction value of the operating frequency of the compressor by fuzzy calculation from the deviation between the target dew point and the current dew point and the difference between this deviation and the previously calculated deviation every predetermined time of dry operation. A value obtained by multiplying the gain is added to the current operating frequency of the compressor to determine the target operating frequency of the compressor, and the compressor is controlled based on the target operating frequency.
At the start of the dry operation, the target operating frequency of the compressor is determined by adding a constant corresponding to the humidity load in the room to the value obtained by multiplying the deviation between the target dew point and the current dew point by a gain, and this target operating frequency Control the compressor based on the
A target humidity selection branch is provided in advance, and the target humidity for calculating the target dew point is changed and set to the target humidity selected by the user from among the selection branches. Dry operation control method. The method for controlling dry operation of an air conditioner according to claim 1, wherein the target humidity is further changed and set according to the presence or absence of a person in the room. It has a compressor, an outdoor heat exchanger, a decompression device and an indoor heat exchanger that can control the operating frequency,
In the air conditioner that enables a dry operation to be performed by controlling a part of the indoor heat exchanger as a reheater and the rest as an evaporator and controlling the operation frequency of the compressor by the control device,
The control device calculates a correction value for the operating frequency of the compressor by fuzzy calculation from the deviation between the target dew point and the current dew point and the difference between the deviation and the previously calculated deviation every predetermined time of the dry operation. The value obtained by multiplying the correction value by the gain is added to the current operating frequency of the compressor to determine the target operating frequency of the compressor, and the compressor is controlled based on the target operating frequency.
At the start of the above dry operation, the target operating frequency of the compressor is determined by adding a constant corresponding to the humidity load in the room to the value obtained by multiplying the deviation between the target dew point and the current dew point by a gain, and this target operating frequency And controlling the compressor based on
A target humidity selection branch is provided in advance, and the target humidity for calculating the target dew point can be changed and set to the target humidity selected by the user from among the selection branches. Air conditioner to do. The air conditioning apparatus according to claim 3, wherein the target humidity is configured to be further changed according to the presence or absence of a person in the room.

Images