JP2016205763A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner, mounted with a constant speed compressor, which appropriately cools an indoor heat exchanger to increase a room temperature to a target temperature without stopping the compressor by adjusting a damper opening in accordance with a temperature of the indoor heat exchanger.SOLUTION: An air conditioner mounted with a constant speed compressor has a damper, to adjust an external air volume to be introduced, at an external air inlet to take in external air. When a room temperature is lower than a target temperature set for indoor heating operation and a temperature difference between a temperature of an indoor heat exchanger and an upper limit temperature preliminarily stored for preventing a failure of the compressor becomes not more than a predetermined value during heating operation, a control section: compares an outdoor temperature acquired through an outdoor temperature sensor with an indoor temperature acquired through an indoor temperature sensor; calculates the temperature difference between the temperature of the indoor heat exchanger and the upper limit temperature when the outdoor temperature is lower than the indoor temperature; and adjusts an external air volume to be introduced by controlling an opening of the damper in accordance with the calculated temperature difference.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an air conditioner including a constant speed compressor.

  Conventionally, in an air conditioner equipped with a constant speed compressor that rotates at a constant rotational speed, like a duct type air conditioner shown in Patent Document 1, the room temperature is adjusted to a set temperature during heating operation. In addition, the following control is performed. When the room temperature rises to a target temperature, which is a temperature determined to be higher than the set temperature by a predetermined temperature, the compressor is stopped. After the compressor is stopped, the compressor is restarted when it falls below a temperature at which the room temperature is set lower than the set temperature by a predetermined temperature, that is, below the operation start temperature at which heating is restarted. Thereby, even in an air conditioner equipped with a constant speed compressor, the room temperature can be air-conditioned at a temperature within a predetermined range from the set temperature.

  Further, in order to prevent failure, the compressor stops when either the pressure or temperature of the refrigerant discharged from the compressor exceeds a predetermined value. Note that the compressor cannot be restarted until a predetermined time has elapsed after stopping to protect the compressor. When the compressor stops during the heating operation, the high-temperature and high-pressure refrigerant does not flow into the indoor heat exchanger, so the temperature of the indoor heat exchanger decreases and the temperature of the room also decreases.

  If the compressor stops due to failure prevention before the room temperature reaches the target temperature, even if the room temperature falls below the operation start temperature, a predetermined time has not passed since the compressor stopped. Can't restart the compressor. Therefore, the room temperature cannot be kept within a predetermined range from the set temperature, and there is a problem that the user feels uncomfortable.

  Therefore, in order to eliminate the above-described problem, during the heating operation for raising the indoor temperature to the target temperature, either the pressure or temperature of the refrigerant discharged from the compressor stops the compressor to prevent failure. There is a method of stopping the outdoor fan when the pressure exceeds the predetermined protection pressure or temperature lower than the stop pressure and the stop temperature, which are the pressure and temperature of the refrigerant. In this method, by stopping the outdoor fan, outdoor air (hereinafter referred to as “outside air”) does not exchange heat with the outdoor heat exchanger, and the refrigerant becomes difficult to absorb heat from the outside air, and the temperature of the refrigerant sucked into the compressor and The pressure drops. Therefore, the temperature and pressure of the refrigerant discharged from the compressor are also lowered, and the operation stop of the compressor can be avoided. However, even this method is insufficient to lower the temperature and pressure of the refrigerant discharged from the compressor. Therefore, either the temperature or pressure of the refrigerant discharged from the compressor exceeds the stop temperature or stop pressure, and the compressor stops. Therefore, the room temperature cannot be maintained within a predetermined range from the set temperature, and there is a problem that the user feels uncomfortable.

JP 10-148383 A

  Therefore, in order to eliminate the above problem, an outside air duct for taking in outside air is connected to a suction duct connecting the indoor unit and the room, and a damper is provided in the outside air duct to lower the temperature of the indoor heat exchanger by the outside air. A method is conceivable. However, the amount of outside air required for cooling the indoor heat exchanger differs depending on the temperature of the indoor heat exchanger. For this reason, when the indoor heat exchanger is cooled more than necessary, the conditioned air blown out from the air outlet becomes cold, which may cause discomfort to the user in the room.

  Therefore, the present invention aims to properly cool the indoor heat exchanger by adjusting the amount of outside air to be introduced by adjusting the opening of the damper according to the temperature of the indoor heat exchanger. is there.

  In order to achieve the above object, the present invention connects an outdoor unit having a constant speed compressor, an outdoor heat exchanger and an outdoor blower, and an indoor unit having an indoor heat exchanger and an indoor blower by a refrigerant pipe. In the air conditioner having the refrigerant circuit formed and the control unit, the indoor unit includes an outside air intake port that takes in outside air that is circulated through the indoor heat exchanger, and an outside air that is provided and introduced to the outside air intake port. A damper that adjusts the amount of room temperature, a room temperature sensor that detects room temperature, an indoor heat exchanger temperature sensor that detects the temperature of the indoor heat exchanger, and the outdoor unit has an outside air temperature sensor that detects the outside air temperature, During heating operation, the room temperature is lower than the target temperature, which is a predetermined temperature higher than the set temperature set during heating operation, and the upper limit temperature stored in advance for preventing the temperature of the indoor heat exchanger and the compressor failure When When the temperature difference falls within a predetermined value, the control unit compares the outside air temperature obtained from the outside air temperature sensor with the room temperature obtained from the room temperature sensor, and if the outside air temperature is lower than the room temperature, the control unit calculates the temperature of the indoor heat exchanger. A temperature difference from the upper limit temperature is calculated, and the amount of outside air to be introduced is adjusted by controlling the opening of the damper according to the calculated temperature difference.

  Further, the control unit performs control so that the opening degree of the damper is increased as the temperature difference is smaller.

  When the temperature of the outside air is lower than the temperature of the room air, the air conditioner of the present invention sets the amount of the outside air introduced to cool the room heat exchanger in accordance with the temperature of the room heat exchanger. Therefore, the indoor heat exchanger can be cooled without excess or deficiency, and the discomfort of the user in the room can be suppressed. Thereby, during heating operation, for example, when the indoor heat exchanger is cooled excessively, the conditioned air blown out from the indoor unit becomes cold, and the possibility that troubles such as a decrease in the indoor temperature occur can be solved. In addition, the smaller the temperature difference between the temperature of the indoor heat exchanger and the upper limit temperature, the greater the amount of outside air required to cool the indoor heat exchanger. Therefore, the amount of outside air necessary for cooling the indoor heat exchanger can be ensured by controlling the opening degree of the damper so that the temperature difference between the temperature of the indoor heat exchanger and the upper limit temperature is small.

It is the figure which showed the indoor unit of the air conditioner in this invention. It is the figure which showed the refrigerant circuit of the air conditioner in this invention. It is the flowchart which showed control of the air conditioner in this invention. It is the figure which showed the opening degree of the damper according to the temperature difference in this invention.

  In an air conditioner 10 according to the present invention, an outdoor unit 200 installed outdoors and an indoor unit 100 installed in an air-conditioned room are connected via a refrigerant pipe to form a refrigerant circuit 1. FIG. 1A shows an indoor unit 100 installed in the ceiling of an air conditioning room, a suction duct 300 that guides air from the air conditioning room to the indoor unit 100, and conditioned air conditioned by the indoor unit 100 to the air conditioning room. FIG. 1B is a front view showing the blowout duct 400, and FIG. 1B is a top view showing the indoor unit 100, the suction duct 300, and the blowout duct 400. FIG. FIG. 2 is a view showing the refrigerant circuit 1 of the air conditioner 10 according to the present invention. As shown in FIG. 1, the indoor unit 100 includes a housing formed in a horizontally long rectangular parallelepiped shape, and a suction duct 300 and an outlet duct 400 are connected to the front and rear of the housing. Further, in order to take outdoor air (hereinafter referred to as “outside air”) into the indoor unit 100, the outdoor air duct 310 is connected to the outdoor air intake port 120 on the side connected to the intake duct 300 of the indoor unit. The outside air duct 310 is connected to the suction duct 300 via the outside air intake port 120, and the outside air intake port 120 is provided with a switching damper 311 that is a damper. By opening and closing the switching damper 311, it is possible to select whether the outside air is introduced into the indoor unit 100 from the outside air duct 310 or the outside air is shut off. Note that the amount of the outside air flowing from the outside air duct 310 can be adjusted by using the switching damper 311. The switching damper 311 is opened and closed by a motor (not shown). The black arrows show the air flow.

  As shown in FIG. 2, the outdoor unit 200 is provided with a compressor 201, a four-way valve 202, an outdoor heat exchanger 203, an outdoor fan 204, and an expansion valve 205. The compressor 201 sucks and compresses a low-temperature and low-pressure refrigerant and discharges the high-temperature and high-pressure refrigerant. The compressor 201 of the present invention is a constant speed type, and the rotation speed of a motor (not shown) in the compressor 201 is a predetermined rotation speed. Further, in order to prevent a failure of the compressor 201, when the temperature or pressure of the refrigerant discharged from the compressor 201 becomes a predetermined value or more, the compressor 201 automatically stops. The four-way valve 202 switches the operation state of the refrigerant circuit 1 between a heating operation and a cooling operation. By switching the four-way valve 202, during the cooling operation, the discharge side of the compressor 201 and the outdoor heat exchanger 203 are connected, and the indoor heat exchanger 102 described later and the suction side of the compressor 201 are connected, and during the heating operation Connects the discharge side of the compressor 201 and the indoor heat exchanger 102 described later, and connects the outdoor heat exchanger 203 and the suction side of the compressor 201. The outdoor heat exchanger 203 is connected to the four-way valve 202 and the indoor unit 100 via a refrigerant pipe. When the refrigerant flows into the outdoor heat exchanger 203, the refrigerant exchanges heat with the outside air. The outdoor air that has undergone heat exchange is exhausted out of the outdoor unit 200 by the outdoor fan 204. The expansion valve 205 lowers the pressure of the refrigerant passing therethrough. During the cooling operation, the high-pressure refrigerant that has passed through the outdoor heat exchanger 203 is reduced to a low pressure, and during the heating operation, the refrigerant passes through the indoor heat exchanger 102 described later. Depressurize high-pressure refrigerant to low pressure. Furthermore, an outdoor air temperature sensor 210 that detects the temperature of the outside air is provided in the vicinity of the outdoor heat exchanger 203 of the outdoor unit 200.

  As shown in FIG. 2, the indoor unit 100 is provided with an indoor heat exchanger 101 and an indoor fan 102. The indoor heat exchanger 101 is connected to an expansion valve 205 and a four-way valve 202 in the outdoor unit 200 via a refrigerant pipe. When the refrigerant flows into the indoor heat exchanger 101, the refrigerant exchanges heat with the air introduced from the suction duct 300 and the outside air duct 310, and the heat-exchanged air becomes conditioned air. The conditioned air generated by the indoor heat exchanger 101 is blown out by the indoor fan 102 through the blowing duct 400 into the air-conditioned room. The indoor heat exchanger 101 is provided with an indoor heat exchanger temperature sensor 103 that detects the temperature of the indoor heat exchanger 101. Furthermore, the indoor unit 100 includes a room temperature sensor 110 that detects the temperature of the indoor air (hereinafter referred to as room temperature). The room temperature sensor 110 is provided in a remote controller 111 connected to the indoor unit 100 by a wire. The indoor unit 100 and the remote controller 111 may be connected wirelessly. In this embodiment, the room temperature sensor 110 is provided in the remote controller 111, but may be provided in the indoor unit 100.

  The air conditioner 10 of the present invention is provided with a control unit 500 that controls the air conditioner 10. In this control unit 500, the temperature of the indoor heat exchanger 101 when the pressure of the refrigerant discharged from the compressor 201 reaches the protection pressure is stored in advance as an upper limit temperature. The upper limit temperature can be derived from the Mollier diagram based on the protective pressure of the compressor 201. Further, the control unit 500 controls the opening / closing of a switching damper 311 described later based on the detected temperature of the indoor heat exchanger temperature sensor 103, the detected temperature of the outside air temperature sensor 210, and the detected temperature of the room temperature sensor 110. Further, the control unit 500 stores the opening degree of the switching damper 311 according to the temperature difference between the upper limit temperature and the temperature of the indoor heat exchanger 101 detected by the indoor heat exchange sensor 103 as shown in FIG. Is stored. As shown in FIG. 4, when the temperature difference is greater than 0 ° C. and 2 ° C. or less, the control unit 500 opens the switching damper 311 to 100% and fully opens. When the temperature difference is greater than 2 ° C. and equal to or less than 4 ° C., the control unit 500 sets the opening degree of the switching damper 311 to 80%. When the temperature difference is greater than 4 ° C. and less than or equal to 5 ° C., the control unit 500 sets the opening degree of the switching damper 311 to 60%. When the temperature difference is greater than 5 ° C. and less than or equal to 6 ° C., the control unit 500 sets the damper opening to 40%. When the temperature difference is greater than 6 ° C. and equal to or less than 7 ° C., the control unit 500 sets the opening degree of the switching damper 311 to 20%. When the temperature difference is larger than 7 ° C., the controller 500 sets the opening degree of the switching damper 311 to 0% and fully closes it. As described above, the reason why the opening degree of the switching damper 311 is increased as the temperature difference between the temperature of the indoor heat exchanger 101 and the upper limit temperature is smaller is that the temperature difference between the temperature of the indoor heat exchanger 101 and the upper limit temperature is smaller. As the temperature of the indoor heat exchanger 101 approaches the upper limit temperature, the indoor heat exchanger 101 needs to be rapidly cooled. In order to cool the indoor heat exchanger 101 rapidly, a large amount of outside air is required. Therefore, the amount of outside air required to cool the indoor heat exchanger 101 is controlled by controlling the opening degree of the switching damper 311 so that the temperature difference between the temperature of the indoor heat exchanger 101 and the upper limit temperature is small. Can be secured. On the other hand, when the temperature difference is large, it is sufficient to cool the indoor heat exchanger 101 a little, so the opening degree of the switching damper 311 is reduced to suppress the amount of outside air introduced. Thus, by adjusting the opening degree of the switching damper 311 stepwise according to the temperature difference, it is possible to introduce the outside air as much as the indoor heat exchanger 101 needs, and to cool the indoor heat exchanger 101 appropriately. it can. The temperature shown in FIG. 4 is an example, and the present invention is not limited to this, and may be changed as appropriate.

Next, operations of the cooling operation and the heating operation in the refrigerant circuit 1 configured as described above will be described below with reference to FIG.
First, the operation of the refrigerant circuit 1 during the cooling operation will be described. The solid arrows indicate the refrigerant flow during the cooling operation. First, the control unit 500 starts a cooling operation according to an instruction from the remote controller 111. The compressor 201 sucks and compresses the low-temperature and low-pressure refrigerant and discharges the high-temperature and high-pressure refrigerant. The discharged high-temperature and high-pressure refrigerant flows into the outdoor heat exchanger 203 through the refrigerant pipe and the four-way valve 202. The refrigerant that has flowed into the outdoor heat exchanger 203 exchanges heat with the outside air to radiate heat, and flows out of the outdoor heat exchanger 203. The refrigerant flowing out of the outdoor heat exchanger 203 flows into the expansion valve 205 through the refrigerant pipe. The refrigerant flowing into the expansion valve 205 is depressurized to become a low-pressure refrigerant. The decompressed low-pressure refrigerant flows out of the outdoor unit 200 through the refrigerant pipe. The refrigerant that has flowed out of the outdoor unit 200 flows into the indoor unit 100 through the refrigerant pipe. The refrigerant flowing into the indoor unit 100 flows into the indoor heat exchanger 101 through the refrigerant pipe. The refrigerant that has flowed into the indoor heat exchanger 101 cools the air that has passed through the indoor heat exchanger 101 and flows out of the indoor heat exchanger 101 as a low-temperature and low-pressure refrigerant. The refrigerant that has flowed out of the indoor heat exchanger 101 flows out of the indoor unit 100 through the refrigerant pipe. The refrigerant that has flowed out of the indoor unit 100 flows into the outdoor unit 200 through the refrigerant pipe. The low-temperature and low-pressure refrigerant that has flowed into the outdoor unit 200 returns to the compressor 201 via the four-way valve 202 through the refrigerant pipe. Thereby, the air in an air-conditioned room can be cooled.

  Next, the operation of the refrigerant circuit 1 during heating operation will be described. The dotted arrows indicate the refrigerant flow during the heating operation. First, the control unit 500 starts a heating operation according to an instruction from the remote controller 111. The compressor 201 sucks and compresses the low-temperature and low-pressure refrigerant and discharges the high-temperature and high-pressure refrigerant. The discharged high-temperature and high-pressure refrigerant flows out of the outdoor unit 200 through the refrigerant pipe and the four-way valve 202. The refrigerant that has flowed out of the outdoor unit 200 flows into the indoor unit 100 through the refrigerant pipe. The refrigerant flowing into the indoor unit 100 flows into the indoor heat exchanger 101 through the refrigerant pipe. The refrigerant flowing into the indoor heat exchanger 101 heats the air that has passed through the indoor heat exchanger 101 and flows out of the indoor heat exchanger 101. The refrigerant that has flowed out of the indoor heat exchanger 101 flows out of the indoor unit 100 through the refrigerant pipe. The refrigerant that has flowed out of the indoor unit 100 flows into the outdoor unit 200 through the refrigerant pipe. The refrigerant flowing into the outdoor unit 200 flows into the expansion valve 205 through the refrigerant pipe. The refrigerant flowing into the expansion valve 205 is depressurized to become a low-pressure refrigerant. The decompressed low-pressure refrigerant flows into the outdoor heat exchanger 203 through the refrigerant pipe. The refrigerant that has flowed into the outdoor heat exchanger 203 exchanges heat with the outside air to absorb the heat and flows out of the outdoor heat exchanger 203 as a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant that has flowed out of the outdoor heat exchanger 203 returns to the compressor 201 via the four-way valve 202 through the refrigerant pipe. Thereby, the air in an air-conditioned room can be heated.

  Next, during the heating operation, control is performed so that the temperature of the indoor heat exchanger 101 falls within a predetermined temperature difference with respect to the upper limit temperature before the room temperature reaches the target temperature that is higher than the set temperature. The control which the part 500 judges and opens / closes the switching damper 311 will be described based on the flowchart of FIG.

  When the control unit 500 receives a signal for starting the heating operation from the remote controller 111, the control unit 500 starts the compressor 201 (S1) and starts the heating operation.

  Next, the control unit 500 acquires the room temperature from the room temperature sensor 110 (S2). Then, the control unit 500 compares the acquired room temperature with the target temperature, and determines whether the room temperature is lower than the target temperature (S3). If the room temperature is equal to or higher than the target temperature (S3-No), the control unit 500 stops the compressor 201 (S4). Next, the control unit 500 acquires the room temperature from the room temperature sensor 110 (S5). And it is judged whether the acquired room temperature is lower than the operation start temperature which restarts heating (S6). If the room temperature is equal to or higher than the operation start temperature (S6-No), the process returns to S5.

  In S6, if the room temperature is lower than the operation start temperature (S6-Yes), the controller 500 detects the temperature of the indoor heat exchanger 101 detected by the indoor heat exchanger temperature sensor 103 (hereinafter referred to as the indoor heat exchanger temperature). Description) is acquired (S7). The control unit 500 determines whether or not the acquired indoor heat exchange temperature is lower than an upper limit temperature determined in advance to prevent the compressor 201 from malfunctioning (S8). If the acquired indoor heat exchange temperature is lower than the upper limit temperature (S8-Yes), the process returns to S1. If the room temperature is equal to or higher than the operation start temperature (S8-No), the process returns to S7.

  In S3, if the room temperature is lower than the target temperature (S3-Yes), the controller 500 acquires the indoor heat exchange temperature from the indoor heat exchange temperature sensor 103 (S9). The controller 500 determines whether or not the acquired indoor heat exchange temperature is lower than the upper limit temperature (S10). If the acquired indoor heat exchange temperature is higher than the upper limit temperature (S10-No), the controller 500 stops the compressor 201 (S11), and proceeds to S7. If the acquired indoor heat exchange temperature is lower than the upper limit temperature (S10-Yes), the control unit 500 calculates a temperature difference between the upper limit temperature and the acquired indoor heat exchange temperature (S12). And the control part 500 is a predetermined value which is the temperature difference by which the calculated temperature difference can make it difficult to reach | attain an indoor heat exchanger temperature to upper limit temperature in the control of this invention which cools the indoor heat exchanger 101 with external air, for example, 7 It is determined whether or not the temperature is higher than C (S13). If the temperature difference is greater than 7 ° C. (S13—Yes), the process returns to S2.

  In S13, if the calculated temperature difference is lower than 7 ° C. (S13-No), the control unit 500 acquires the outside air temperature from the outside air temperature sensor 210 (S14). Next, the control unit 500 compares the room temperature acquired in S2 with the outside air temperature acquired in S14, and determines whether or not the outside air temperature is lower than the room temperature (S15).

  In S15, if the outside air temperature is equal to or higher than room temperature (S15-No), the process returns to S2. If the outside air temperature is lower than the room temperature in S15 (S15-Yes), the control unit 500 refers to the damper opening table as shown in FIG. 4 and switches the damper according to the temperature difference calculated in S12. The opening degree of 311 is acquired (16). The controller 500 adjusts the switching damper 311 so as to obtain the acquired opening (S17), and returns to S2.

  With the above control, when the temperature of the outside air is lower than the temperature of the indoor air, the inflow amount of the outside air introduced to cool the indoor heat exchanger may be set to an appropriate amount according to the temperature of the indoor heat exchanger. Therefore, the indoor heat exchanger can be cooled without excess or deficiency, and the discomfort of the user in the room can be suppressed. Thereby, during heating operation, for example, when the indoor heat exchanger is cooled excessively, the conditioned air blown out from the indoor unit becomes cold, and the possibility that troubles such as a decrease in the indoor temperature occur can be solved. In addition, the smaller the temperature difference between the temperature of the indoor heat exchanger and the upper limit temperature, the greater the amount of outside air required to cool the indoor heat exchanger. Therefore, the amount of outside air necessary for cooling the indoor heat exchanger can be ensured by controlling the opening degree of the damper so that the temperature difference between the temperature of the indoor heat exchanger and the upper limit temperature is small. Thereby, the temperature of the refrigerant sucked into the compressor 201 can be lowered, and the pressure of the refrigerant discharged from the compressor 201 is also lowered, thereby preventing the pressure of the discharged refrigerant from exceeding the stop pressure. Can do. Therefore, since the room temperature can be raised to the target temperature without stopping the compressor 201, the room temperature can be kept within a predetermined range from the set temperature.

  In this embodiment, when the temperature difference between the indoor heat exchanger temperature and the upper limit temperature of the indoor heat exchanger 101 becomes small, the switching damper 311 is controlled to take in the outside air, but the present invention is limited to this. However, when the temperature difference between the indoor heat exchanger temperature and the upper limit temperature of the indoor heat exchanger 101 falls within a predetermined value, a method of stopping the outdoor fan 204 may be used together. Thereby, since the pressure of the refrigerant | coolant suck | inhaled by the compressor 201 falls further, the pressure of the refrigerant | coolant discharged from the compressor 201 also falls. Therefore, it can prevent that the pressure of the refrigerant | coolant discharged becomes more than a protection pressure. Further, in this embodiment, the amount of indoor air sucked in is not adjusted, but the present invention is not limited to this, and the amount of indoor air sucked in as the amount of outside air introduced increases. You may adjust so that it may decrease.

DESCRIPTION OF SYMBOLS 100 Indoor unit 200 Outdoor unit 300 Suction duct 310 Outside air duct 311 Switching damper 400 Outlet duct

Claims (2)

An outdoor unit comprising a constant speed compressor, an outdoor heat exchanger and an outdoor blower;
In an air conditioner having an indoor heat exchanger, a refrigerant circuit formed by connecting an indoor unit equipped with an indoor blower by refrigerant piping, and a control unit,
The indoor unit has an outside air intake port for taking in outside air to be circulated through the indoor heat exchanger;
A damper that is provided at the outside air intake and adjusts the amount of outside air to be introduced;
A room temperature sensor for detecting room temperature;
An indoor heat exchanger temperature sensor for detecting the temperature of the indoor heat exchanger;
The outdoor unit has an outside air temperature sensor for detecting outside air temperature,
During the heating operation, the room temperature is lower than the target temperature, which is a predetermined temperature higher than the set temperature set during the heating operation, and is stored in advance to prevent the temperature of the indoor heat exchanger and the compressor from malfunctioning. When the temperature difference from the upper limit temperature is within the specified value,
The control unit compares the outside temperature acquired from the outside temperature sensor and the room temperature obtained from the room temperature sensor, and when the outside temperature is lower than the room temperature,
Calculating the temperature difference between the temperature of the indoor heat exchanger and the upper limit temperature, and adjusting the amount of outside air to be introduced by controlling the opening of the damper according to the calculated temperature difference. Machine. In the air conditioner according to claim 1,
The said control part controls so that the opening degree of the said damper becomes large, so that the said temperature difference is small, The air conditioner characterized by the above-mentioned.

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