JP2011137597A - Air conditioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of dew condensation even when a heat pump cooling operation by operating an air conditioner and an outside air cooling operation only by introducing the outside air are alternately switched. <P>SOLUTION: This air conditioning device includes the air conditioner 1 having a compressor, constituting a refrigerating cycle, and cooling and supplying the sucked air, a duct 8 for guiding the indoor air to the air conditioner, an air intake damper 6 controlling the inflow of the indoor air to the duct, an outside air damper 7 controlling inflow of the outside air indoors, and an outside air temperature sensor 3. This air conditioning device has a heat pump operation mode for cooling a room by the heat pump operation, and an outside air cooling mode for introducing the outside air indoors by controlling the air intake damper and the outside air damper, and cooling the room. When the outside air temperature is lowered, and the device is switched from the heat pump operation mode to the outside air cooling mode, a frequency of the compressor is lowered, a supply temperature is raised, and then the outside air is introduced indoors. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner for cooling a room such as an information communication room or a computer room storing information communication equipment such as computers and network equipment.

In a conventional air conditioner for an information communication room, room cooling has been performed by controlling the blow-out temperature of a heat pump air conditioner.
On the other hand, as shown in Patent Document 1, an air conditioner in which outside air is introduced and air conditioning is performed in combination with indoor ventilation is known. The amount of outside air introduced is controlled by means.

  In recent years, especially in the field of air conditioning such as information and communication rooms, there is a growing need for energy saving, and outside air is introduced under conditions where the outside air temperature is lower than the room temperature for air conditioning, and an outside air cooling mode is provided to cover the air conditioning load. Development of an air conditioner is desired. If the outside air is introduced and cooled, energy can be saved. Therefore, in order to save energy in the air conditioner for an information communication room, an outside air introduction type air conditioner has been studied.

JP 2006-275509 A

  However, for the cooling of information communication rooms, etc., the operation is simply switched alternately between the heat pump operation mode (heat pump cooling operation) by the operation of the air conditioner and the outside air cooling mode (outside air cooling operation) by only introducing the outside air. When implemented, there is a concern that the blowout temperature will fluctuate significantly and condensation will occur in the information communication room.

  An object of the present invention is to obtain an air conditioner that can prevent the occurrence of condensation even when the heat pump cooling operation by the operation of the air conditioner and the outside air cooling operation by only introducing the outside air are alternately switched.

  In order to achieve the above object, the present invention comprises an air conditioner having a compressor to constitute a refrigeration cycle so as to cool and blow out intake air, a duct for guiding indoor air to the air conditioner, An air conditioner comprising: an intake damper that controls inflow of room air into a duct; an outside air damper that controls inflow of outside air into the room; and an outside air temperature sensor that detects a temperature of outside air. When the outside air temperature detected by the outside air temperature sensor reaches a preset temperature when the outside air temperature detected by the outside air temperature sensor reaches a preset temperature, the outside air damper is controlled by controlling the intake air damper and the outside air damper. Is provided with an outside air cooling mode for cooling the room, and the heat pump operation is performed when switching from the heat pump operation mode to the outside air cooling mode. Reducing the frequency of the compressor in operation at over de, characterized in that subsequently configured to introduce outside air into the room.

  Another feature of the present invention is that the compressor, the outdoor heat exchanger, the expansion means, and the indoor heat exchanger are sequentially connected by refrigerant piping to form a refrigeration cycle, and the indoor air is sucked and cooled by the heat exchanger. An air conditioner that blows out into the room by a blower, a duct that guides room air to the air conditioner, an intake damper that controls the inflow of room air into the duct, and an inflow of outside air into the duct. An air conditioner comprising an outside air damper for controlling and an outside air temperature sensor for detecting a temperature of outside air, a heat pump operation mode for cooling a room by a heat pump operation for driving a compressor of the air conditioner, and the intake damper And an outside air cooling mode in which outside air is introduced into the room by the blower of the air conditioner to cool the room by controlling the outside air damper. Wherein when switching the outdoor air cooling mode, once lowers the frequency of the compressor operating in the heat pump operating mode, it is subsequently to the outside air by opening the outside air damper and configured to introduce into the room.

  Here, a suction temperature sensor that detects a suction temperature to the air conditioner and a blow temperature sensor that detects a temperature of blown air blown from the air conditioner are provided, and the outside air cooling mode is changed from the heat pump operation mode. When switching to, it is preferable to detect the temperature of air blown out from the air conditioner and switch it after the temperature has risen to a level that does not cause condensation even when outside air is introduced. In addition, the present invention is suitable for use in air conditioning in an information communication room that stores information communication devices.

  In the above, in order to switch from the heat pump operation mode to the outside air cooling mode, the frequency of the compressor operating in the heat pump operation mode is reduced, and an upper limit is provided for the operation frequency, thereby The blowing temperature can be raised to a temperature at which no condensation occurs even when outside air is introduced.

  Further, it is preferable that an outside air humidity sensor is further provided, and the outside air is introduced and the operation is performed in the outside air cooling mode when the outside air temperature and the outside air humidity are in a predetermined range.

  When switching from the heat pump operation mode to the outside air cooling mode, by reducing the frequency of the compressor for a certain period of time, the blowing temperature from the air conditioner is increased to a temperature that does not condense even when outside air is introduced. It is good to switch. Here, when the outside air temperature detected by the outside air temperature sensor reaches a predetermined set temperature (threshold), the operating frequency of the compressor may be lowered for a certain period of time.

  In addition, when the outside air temperature detected by the outside air temperature sensor reaches a certain temperature approaching a predetermined set temperature (threshold), the operating frequency of the compressor is lowered to a temperature at which no condensation occurs even when outside air is introduced. It is also possible to operate to increase the temperature of the air conditioner or the temperature around the air outlet, and then switch to the outside air cooling mode when the threshold is reached. Here, when the threshold is not reached even after a lapse of a certain time after the operating frequency of the compressor is lowered, the normal heat pump operation mode is returned, and the normal heat pump operation mode is continued for a certain time.

  According to the present invention, a heat pump operation mode and an outside air cooling mode for introducing outside air into the room to cool the room are provided. When switching from the heat pump operation mode to the outside air cooling mode, the compressor operating in the heat pump operation mode is provided. The frequency is once lowered and the temperature of the air conditioner is increased to a temperature that does not cause condensation even when outside air is introduced, and then the outside air is introduced into the room. Even if the heat pump operation mode and the outside air cooling mode by only introducing outside air are alternately switched and operated, an air conditioner that can prevent the occurrence of dew condensation can be obtained.

The block diagram which shows Example 1 of the air conditioning apparatus of this invention. The refrigeration cycle block diagram of the air conditioner 1 shown in FIG. The block diagram which shows the control apparatus in Example 1 of this invention. The diagram explaining the control in Example 1 of this invention. The flowchart explaining the control in Example 1 of this invention.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram illustrating Embodiment 1 of an air-conditioning apparatus of the present invention. In the figure, R is an information communication room storing information communication devices (not shown) such as computers and network devices, R1 is an underfloor space, and R2 is a ceiling space. Reference numeral 1 denotes an air conditioner installed on the floor surface R3 of the information communication room R. One end of a suction duct 8 is connected to the suction side of the air conditioner 1, and the other end side of the suction duct 8 is bifurcated. One is connected to an indoor air inlet R5 provided on the ceiling surface R4 so that the indoor air in the information communication room R can be taken into the air conditioner 1 through the ceiling space R2. ing. The other of the suction duct 8 which is divided into two forks is connected to an outdoor air intake R6 provided in the information communication room R. The indoor air intake R5 is provided with an intake damper 6 that can open and close the intake and adjust the opening. The outdoor air intake R6 can open and close and adjust the opening. An outside air damper 7 is provided. The dampers 6 and 7 may be provided in ducts close to the respective intakes.

  The blowout side of the air conditioner 1 is opened to the underfloor space R1 so that air conditioned can be blown into the information communication room R through the underfloor space R1. The air conditioner 1 is provided with an indoor heat exchanger 15 and a blower 16, and the air taken into the air conditioner 1 from the suction duct 8 is cooled by the indoor heat exchanger 15 and is blown under the floor by the blower 16. It is blown out into the space R1.

  Further, a suction temperature sensor 2 is provided on the suction side in the air conditioner 1, and an outside air temperature sensor 3 is provided on the suction side of the outdoor air inlet R6 or outside the room, and an underfloor space R1 on the air conditioner outlet side. Are provided with an outlet temperature sensor 4 and an outlet humidity sensor 5, respectively. The detection values of these sensors 2 to 5 are sent to a control device (not shown in FIG. 1, see FIG. 3) provided in the air conditioner 1.

  The intake damper 6 and the outside air damper 7 are opened and closed to perform a heat pump cooling operation and an outside air cooling operation by introducing outside air. That is, in the heat pump cooling operation, the air in the information communication room is sucked from the ceiling space R2 through the intake damper 6, and the compressor of the air conditioner 1 (not shown in FIG. 1, see FIG. 2) is driven. The sucked room air is cooled by the heat exchanger 15 of the air conditioner, and blown out again into the information communication room R by the blower 16 through the underfloor space R1. In the outside air cooling operation by introducing outside air, outside air is introduced into the air conditioner 1 through the outside air damper 7, and outside air is blown into the information communication room R through the underfloor space R 1 by the blower 16.

  At the time of the outside air cooling operation by introducing the outside air, the compressor is normally stopped, the intake damper 6 is closed and the outside air damper 7 is opened, and the operation is performed, but the heat pump cooling operation in which the compressor is operated at a low speed is also used. Also good. In this case, the intake damper 6 may remain closed, or may be opened to an appropriate opening as necessary. In addition, when performing normal heat pump cooling operation, the intake damper 6 is fully opened and the outside air damper 7 is fully closed.

  FIG. 2 shows a refrigeration cycle configuration diagram of the air conditioner 1 in the present embodiment. In the present embodiment, the air conditioner 1 is described as an example in which the air conditioner 1 is configured by one refrigeration cycle including one indoor unit 1a and one outdoor unit 1b. However, other configurations, for example, two refrigeration cycles are provided. It is also possible to control the number of refrigeration cycles operated by the air conditioning load.

  In the indoor unit 1a, 9 is a compressor (9A is a variable speed compressor, 9B is a constant speed compressor), 10 is an oil separator provided on the discharge side of the compressor 9, and 14 is a compressor 9 An indoor heat exchanger 15 and an accumulator 17 are provided between the expansion valve 14 and the compressor 9 as an expansion valve provided on the suction side. 16 is a blower for the indoor heat exchange 15, 18A and 18B are check valves provided between the compressor 9 and the oil separator 10, and 19 is for returning the oil separated by the oil separator 10 to the accumulator 17. The oil return circuit 19 is provided with an oil control valve 19a and a capillary tube 19b. Reference numeral 20 denotes a gas blocking valve provided at a connection portion with the gas pipe 22, and reference numeral 21 denotes a liquid blocking valve provided at a connection portion with the liquid pipe 23. Note that the air conditioner 1 shown in FIG. 1 corresponds to the indoor unit 1a.

  The outdoor unit 1b includes an outdoor heat exchanger 11, an outdoor heat exchange fan 12, a refrigerant amount adjuster 13, and the like. The outdoor unit 1b is connected to the indoor unit 1a by the gas pipe 22 and the liquid pipe 23.

  Next, the operation in the refrigeration cycle configured as described above will be described. First, the low-temperature and low-pressure refrigerant gas is compressed to high temperature and high pressure by the compressors 9A and 9B, and the high-temperature and high-pressure refrigerant gas discharged from the compressor is the check valves 18A and 18B, the oil separator 10, the gas blocking valve 20 and the gas. It enters the outdoor heat exchanger 11 through the pipe 22, where it is heat-exchanged with the outside air to condense and become a liquid refrigerant. The liquid refrigerant passes through the refrigerant amount regulator 13, the liquid pipe 23, and the liquid blocking valve 21, enters the expansion valve 14 on the indoor unit side, and is depressurized. Then, the liquid refrigerant evaporates by exchanging heat with indoor air in the indoor heat exchanger 15. It becomes a low-pressure gas refrigerant. This low-pressure gas refrigerant passes through the accumulator 17 and is again sucked into the compressors 9A and 9B.

  FIG. 3 is a block diagram showing a control device of the air conditioner in the present embodiment. The control device of the air conditioner according to the present embodiment is built in an electric box (not shown) in the indoor unit, and is detected by the suction temperature sensor 2, the outside air temperature sensor 3, and the blowout temperature sensor 4 shown in FIG. In addition, the signals of the intake temperature to the air conditioner 1, the outside air temperature, and the blowout temperature from the air conditioner are input to the operation setting unit 30 constituting the control device, and the operation setting is performed based on these information. The means 30 determines whether to perform the heat pump cooling operation by driving the refrigeration cycle shown in FIG. 2 or to perform the outside air cooling operation by introducing outside air. In response to the determination by the operation setting unit 30, the outside air introduction control unit 31 and the air conditioner operation control unit 32 operate.

  When the outside air temperature reaches a predetermined set temperature lower than the room temperature to be air-conditioned by the signal from the outside air temperature sensor 3 and the outside air cooling operation by outside air introduction is selected, the outside air introduction control means 31 is activated. The outside air damper 7 shown in FIG. 1 is controlled to be in an open state, and outside air is introduced into the information communication room R through the underfloor space R1 by the blower 16 of the air conditioner 1. When the outside air cooling operation by introducing outside air is selected, the intake damper 6 is closed and the compressor 9 in the refrigeration cycle shown in FIG. 2 is stopped, so that the indoor heat exchanger shown in FIGS. No heat exchange takes place at 15.

  When the outside air temperature is higher than or similar to the room temperature of the air-conditioning target, it is difficult to cool the room by introducing the outside air, so the heat pump cooling operation is selected. In this case, the air conditioner operation control means 32 is activated, the outside air damper 7 shown in FIG. 1 is closed, the intake damper 6 is controlled to be opened, and the compressor 9 of the refrigeration cycle shown in FIG. 2 is driven. The indoor air introduced into the air conditioner 1 from the ceiling space R2 shown in FIG. 1 is cooled by heat exchange with the refrigerant in the heat exchanger 15, and blown out into the room through the underfloor space R1 by the blower 16.

  Further, the compressor 9 shown in FIG. 2 controls the rotation speed (frequency) of the variable speed compressor 9A according to signals from the suction temperature sensor 2 and the blowout temperature sensor 5 shown in FIG. The ON / OFF control of the machine 9B is performed.

  FIG. 4 is a diagram illustrating an example of the operation of the air conditioner according to the present embodiment with respect to changes in the outside air temperature. The horizontal axis indicates the passage of time, and in this example, an example is shown in which the outside air temperature (solid line A) decreases with the passage of time. Under conditions where the outside air is not low (in the left half of the figure, for example, 18 ° C. or higher), heat pump cooling operation (heat pump operation mode) is performed, and suction / blowout temperature control and compressor frequency control are performed according to the air conditioning load. The When the outside air temperature falls to a certain threshold value (for example, 18 ° C.), the compressor is stopped to stop the heat pump cooling operation, and an outside air cooling operation (outside air cooling mode) by introducing outside air is performed instead. In the outside air cooling operation, the indoor air conditioning load is covered by outside air having a low temperature, and the room is cooled by outside air.

  Conventionally, until the outside air temperature reaches, for example, 18 ° C. (between the heat pump cooling operation and the outside air cooling operation), the compressor is controlled according to the suction temperature and the blowing temperature to the air conditioner. As indicated by the dotted line B, it was operated at a substantially constant high frequency. For this reason, when the outside air temperature is 18 ° C., the cooling temperature from the air conditioner has a low value (for example, 13 ° C.) as indicated by the dotted line C because the cooling capacity may increase. .

  From this heat pump cooling operation state, when the outside air temperature becomes 18 ° C. and suddenly switches to the outside air cooling operation, the outside air (18 ° C.) having a temperature higher than the blowing temperature (13 ° C.) before the switching is It is introduced into the room through the underfloor space R1 by the blower 16. Since the temperature around the air outlet of the air conditioner is as low as the temperature of the blowout air (13 ° C.) when switching to the outside air cooling operation, the outside air is cooled when the outside air of 18 ° C. flows in. When the temperature difference between the outside air temperature and the blower outlet side is large, the introduced outside air reaches the dew point temperature and causes dew point around the outlet (for example, the dew point temperature of air at 18 ° C. and 75% relative humidity is 13. 4 ° C). In particular, in the cooling of an information communication room or the like, water on a server or the like may cause a problem that leads to damage to expensive equipment or information, such as a decrease in insulation of an electric system.

  On the other hand, in this embodiment, before switching from the heat pump cooling operation to the outside air cooling operation, the compressor operating frequency is lowered as shown by the curve D, and the cooling capacity is lowered so that the blowing temperature is shown by the curve F. To a higher value (for example, 15 to 16 ° C.). By performing such control, even if the outside air is switched to the outside air cooling mode and the outside air is introduced into the room, the difference between the outside air and the blowout temperature can be reduced, so that the outside air reaches the dew point temperature and condensation occurs. Can be prevented. In addition, in FIG. 4, the curve E has shown the suction temperature to the air conditioner in a present Example.

As a timing for lowering the compressor frequency as shown by the curve D before switching to the outside air cooling operation, for example, any one of the following controls may be adopted.
(I) When the outside air temperature reaches a certain temperature (for example, 18.5 ° C.) that is close to a predetermined set temperature (threshold) to some extent, the operating frequency of the compressor is lowered, and the temperature at which no condensation occurs even when outside air is introduced (for example, 15 to 16 ° C.) is operated to increase the temperature of the air conditioner or the temperature around the air outlet of the air conditioner, and when it reaches a threshold value (for example, 18 ° C.), the operation is switched to the outside air cooling operation. If the threshold is not reached even after a certain time (for example, 30 minutes), the process returns to the heat pump cooling operation, and after the heat pump cooling operation is continued for a certain time (for example, 30 minutes), the same operation is repeated again.
(ii) When the threshold value (for example, 18 ° C.) is reached, the compressor operating frequency is lowered for a certain period of time (for example, 30 seconds), and the temperature at which the air conditioner blows out or the air conditioner at the temperature at which no condensation occurs even when outside air is introduced Switch to outside air cooling operation after raising the ambient temperature.

  A specific control example of this embodiment will be described with reference to the flowchart shown in FIG. First, the operation is normally started in the heat pump operation mode (heat pump cooling operation) (ST1). When the operation in the heat pump operation mode is started, the outside air damper 7 shown in FIG. 1 is closed, the intake damper 6 is controlled to be opened, and the compressor 9 of the air conditioner is started to operate (ST2). When the outside air temperature decreases during this operation and reaches a certain threshold value (18 ° C.) (ST3), the operation operation setting means 30 shown in FIG. 3 switches to the outside air cooling mode (outside air cooling operation) (ST4). At the time of this switching, the compressor frequency is first set to a low value (ST5), and after a predetermined time (30 seconds in this embodiment) has elapsed (ST6), the outside air damper is opened and the damper is switched to close the intake damper. While introducing the outside air, the compressor is stopped (ST7). When the outside air temperature rises to a certain threshold value (18 + 3 ° C.) during operation in the outside air cooling mode (ST8), the heat pump operation mode is entered again, the damper is switched, the room air is introduced, the compressor is started, and so on. Control is repeated.

  In the control example shown in FIG. 5, in step 6 (ST6), if 30 seconds elapses, the air temperature of the air conditioner becomes a high value, and even if outside air is introduced, the outside air reaches the dew point temperature and condensation occurs. It is assumed that it can be prevented. However, in order to prevent condensation more reliably, it is more reliable to switch to the outside air cooling mode after confirming with the blowing temperature sensor 4 that the temperature is such that no condensation occurs even when outside air is introduced. Condensation can be prevented.

  Further, if an outside air humidity sensor (not shown) is further provided and the outside air is introduced and the operation is performed in the outside air cooling mode when the outside air temperature and the outside air humidity are in a predetermined range, it is effective in preventing condensation. It is.

  According to the present embodiment described above, even if the heat pump operation mode (heat pump cooling operation) based on the operation of the air conditioner and the outside air cooling mode (outside air cooling operation) based on only the introduction of the outside air are alternately switched, dew condensation occurs. It is possible to obtain an air conditioner that can prevent the occurrence of the above.

  In the air conditioning of information and communication rooms and computer rooms, the prevention of condensation as described above can avoid problems such as insulation degradation of the electrical system due to water on the server, etc. For example, if the indoor humidity is too low (dry), static electricity is likely to occur and the server or the like may be damaged. In the embodiment shown in FIG. 1, a blowout humidity sensor 5 is provided. When the humidity is detected and the humidity is reduced to a set value, the humidifier is humidified using a humidifier (not shown) or the like to generate static electricity. I try to prevent it.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Suction temperature sensor 3 Outside temperature sensor 4 Outlet temperature sensor 5 Outlet humidity sensor 6 Intake damper 7 Outside air damper 8 Duct 9 Compressor (9A ... variable speed compressor, 9B ... constant speed compressor)
DESCRIPTION OF SYMBOLS 10 Oil separator 11 Outdoor heat exchangers 12 and 16 Blower 13 Refrigerant amount regulator 14 Expansion valve 15 Indoor heat exchanger 16 Blower 17 Accumulator 18 Check valve 19 Oil return circuit (19a ... Oil control valve, 19b ... capillary tube)
20 Gas blocking valve 21 Liquid blocking valve 22 Gas pipe 23 Liquid pipe 30 Operation operation setting means 31 Outside air introduction control means 32 Air conditioner operation control means A Outside air temperature B, D Compressor operation frequency C, F Around the air conditioner outlet Temperature E Air conditioner suction temperature R Information communication room (R1: floor space, R2: ceiling space, R3: floor surface, R4: ceiling surface, R5: indoor air intake, R6: outdoor air intake).

Claims (10)

An air conditioner that has a compressor and constitutes a refrigeration cycle to cool and blow out intake air, a duct that guides indoor air to the air conditioner, and intake air that controls the inflow of room air into the duct In an air conditioner comprising a damper, an outside air damper that controls inflow of outside air into the room, and an outside air temperature sensor that detects the temperature of outside air,
A heat pump operation mode for cooling the room by a heat pump operation for driving the compressor of the air conditioner; and
When the outside air temperature detected by the outside air temperature sensor reaches a predetermined set temperature, the outside damper is controlled by introducing the outside air into the room by controlling the intake damper and the outside air damper, and the outside air cooling mode for cooling the room is provided.
An air conditioner configured to reduce the frequency of the compressor operating in the heat pump operation mode and then introduce outside air into the room when switching from the heat pump operation mode to the outside air cooling mode. A compressor, an outdoor heat exchanger, expansion means, and an indoor heat exchanger are sequentially connected by a refrigerant pipe to form a refrigeration cycle, and air is sucked into the room, cooled by the heat exchanger, and then blown out into the room by a blower. An air conditioner, a duct for guiding room air to the air conditioner, an intake damper for controlling the inflow of room air into the duct, and an outside air damper for controlling the inflow of outside air into the duct; In an air conditioner comprising an outside temperature sensor for detecting the temperature of outside air,
A heat pump operation mode for cooling the room by a heat pump operation for driving the compressor of the air conditioner; and
By controlling the intake damper and the outside air damper, it has an outside air cooling mode in which the outside air is introduced into the room by the blower of the air conditioner and the room is cooled.
When switching from the heat pump operation mode to the outside air cooling mode, the frequency of the compressor operating in the heat pump operation mode is once reduced, and then the outside air damper is opened to introduce outside air into the room. An air conditioner characterized.   In Claim 1 or 2, the suction temperature sensor which detects the suction temperature to the air conditioner, and the blowing temperature sensor which detects the temperature of the blowing air which blows off from the air conditioner are provided, From the heat pump operation mode When switching to the outside air cooling mode, the air conditioning apparatus is characterized in that the temperature is switched after the temperature from the air conditioner is detected and the temperature rises to a temperature where no condensation occurs even when outside air is introduced.   4. The air conditioner according to claim 1, wherein the air conditioner is used for air conditioning of an information communication room for storing information communication devices.   In any one of Claims 1-4, in order to switch from the said heat pump operation mode to the said external air cooling mode, while lowering | hanging the frequency of the said compressor currently operate | moving in the said heat pump operation mode, providing an upper limit to an operation frequency. The air conditioner is characterized in that the temperature of the air from the air conditioner is raised to a temperature that does not cause condensation even when outside air is introduced.   The air according to any one of claims 1 to 5, further comprising an outside air humidity sensor, wherein the outside air is introduced and the operation is performed in the outside air cooling mode when the outside air temperature and the outside air humidity are in a predetermined range. Harmony device.   In any one of Claims 1-6, when switching from the said heat pump operation mode to the said external air cooling mode, the blowing temperature from the said air conditioner introduces external air by reducing the frequency of the said compressor for a fixed time. An air conditioner that is switched so as to increase to a temperature at which no condensation occurs.   8. The air conditioner according to claim 7, wherein when the outside air temperature detected by the outside air temperature sensor reaches a predetermined set temperature (threshold), the operating frequency of the compressor is lowered for a predetermined time.   7. The compressor according to claim 1, wherein when the outside air temperature detected by the outside air temperature sensor approaches a predetermined set temperature (threshold value) and reaches a certain temperature, the operating frequency of the compressor is reduced to reduce the outside air temperature. An air conditioner that operates to raise the temperature of the air conditioner blowout temperature or the temperature around the blowout port to a temperature that does not condense even if introduced, and then switches to the outside air cooling mode when the threshold is reached.   10. The normal heat pump operation mode is returned to the normal heat pump operation mode when the threshold is not reached even after a lapse of a certain time after the operation frequency of the compressor is lowered, and the normal heat pump operation mode is continued for a certain time. Air conditioner.

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