JPH10292949A - Compressor capacity controller for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor capacity controller for an air conditioner which can constantly keep the maximum output as a heat pump circuit within the operational limit of the compressor, by grasping the operational conditions of the compressor as a whole from each condition of a heat medium in the suction and discharge positions of the compressor, the condition of the rotation number of the compressor, etc. SOLUTION: An air conditioner is equipped with a heat pump circuit comprising at least the first heat exchanger EX1 which heat exchanges between outside air or return air and the first heat medium, the second heat exchanger EX2 which heat exchanges between the first heat medium and the second heat medium, a compressor COM, and expansion valves EV1 and 2. The compressor COM comprises the compressor equipped with a capacitive variable means INV. Sensors SE1 and 2 which detect a temperature or a pressure are attached to each discharge position and suction position of the first heat medium of the compressor COM. A capacity control means QC is provided to control the capacity of the compressor COM for the capacitive variable means INV according to the conditions of the temperature or pressure of the first heat medium inputted by the sensor SE1 and 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner having a heat pump circuit using external air and / or return air as a heat source, and more particularly to a capacity control device for a compressor attached to a heat pump circuit.

[0002]

2. Description of the Related Art In recent years, air-conditioning systems for office buildings and the like have been changed from a central system to an individual decentralized system in response to an increase in cooling load due to intelligent building functions and a demand for more comfortable office environments. It is changing. An air heat source type air conditioner disclosed in Japanese Patent Application Laid-Open No. 7-198161 is known as an air conditioner suitable for such an individual distributed building air conditioning system.

An air heat source type air conditioner of this type incorporates a heat pump circuit having a plurality of heat exchangers, a heat discharge path having a gas-liquid contact heat exchanger, and a heat storage tank. The air-conditioning system is configured as a completely independent and decentralized air-heat-source type air-conditioning system that uses only air having a volume equal to or less than the outside air taken in to maintain the indoor air quality in the air-conditioned room as a heat source, and thus apparently does not require a heat source.

[0004] However, the configuration of the air conditioning system is relatively complicated, so that a relatively complicated control method must be adopted. That is, in the above air conditioning system, the heat pump circuit is a multi-system, a dedicated control device is required, the heat storage tank coil is a direct expansion system, the amount of refrigerant charged is increased, and heat exchange with supply air is further performed. In the air conditioner coil, the direct expansion type heat exchanger and the water heat exchanger are arranged in series, and the control is duplicated. Therefore, there has been a technical demand to achieve an effect equal to or higher than that of the air conditioning system by a simpler configuration and control method.

[0005] The applicant of the present invention, in the earlier application, can flexibly cope with various air-conditioning demands required in each individual air-conditioning space with a relatively simple configuration, and furthermore, initial costs, running costs, and the like. A new and improved air conditioner has been proposed which is advantageous in terms of life cycle cost and can achieve standardization of construction and equipment arrangement in a building.

The capacity of the hermetic compressor for the heat pump circuit used in the above air conditioning system must be changed due to load fluctuation or the like. However, when the capacity is controlled by manipulating the number of revolutions of the hermetic compressor. ,
Due to the performance of the hermetic compressor, that is, the need for mechanical protection such as cooling of the motor windings and oil return, it is inevitable to limit the operating range thereof.

In general, the mechanical load of the compressor increases as the rotational speed decreases, the suction heat medium pressure decreases, the discharge heat medium pressure increases, and the compression ratio increases.

Therefore, it is necessary to comprehensively determine the limit of the operating range of the compressor from the state of the suction heat medium to the compressor, the state of the discharge heat medium, the number of revolutions of the compressor, the compression ratio of the compressor, and the like. is there.

When the load form can be predicted to some extent as in a normal air conditioner, the amount of heat source air such as external air to be supplied and the amount of heat so that the compressor does not exceed the operating range even at the maximum load. The capacity of the exchanger is designed, and if a load exceeding the prediction occurs, it is judged that the operation limit has been exceeded by the pressure switch, temperature switch, or other sensor attached to the specified location, and compression is performed. It was common to configure the machine to stop.

[0010]

However, according to this method, the problem of operating range limitation determined by the intertwining of the complex factors as described above is determined from a phenomenon on one side, and the optimum operating range limitation is determined. It cannot be said that it has been done.
Therefore, there is a problem that a heat exchanger larger than necessary must be used or a design must be made so as to secure a larger amount of heat source air than necessary.

In particular, as described above, in the case of an air conditioner having a structure in which exhaust air from a room is used as a main heat source air, the amount of available heat source exhaust gas changes according to the indoor use conditions. There is no guarantee that the air volume will be sufficient. For this reason, when it is desired to perform more heat storage within a limited time during which the heat storage operation can be performed on the heat storage tank installed in the air conditioner,
In addition, when the heat pump circuit is used as a base load during air-conditioning operation and it is desired to reduce the amount of heat stored in the heat storage tank as much as possible, the true limit of the compressor is always grasped and the heat pump circuit maintains the maximum output. It is desired to perform.

The present invention has been made in view of the above points, and has as its object the operation of the compressor based on the state of the heat medium at the suction position and the discharge position of the compressor and the state of the rotational speed of the compressor. An object of the present invention is to provide a compressor capacity control device for an air conditioner capable of grasping the state comprehensively and always maintaining the maximum output as a heat pump circuit within the operation limit of the compressor.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first heat exchanger for exchanging heat between outside air and / or return air and a heat medium, and a heat exchanger for heat exchange with the heat medium. An air conditioner comprising a heat pump circuit comprising at least a second heat exchanger for exchanging heat with a medium, a compressor, and an expansion valve, wherein the compressor is a compressor having a variable capacity means. Along with the configuration, attached a sensor for detecting the temperature or pressure at the discharge position and the suction position of the heat medium of the compressor, respectively,
Furthermore, a compressor capacity control device for an air conditioner is provided by providing a capacity control means for controlling the capacity of the compressor to the capacity variable means in accordance with the temperature or pressure state of the heat medium input from these sensors. Was configured.

The present invention also provides an outside air intake for taking in outside air, a return air opening for taking in return air from inside a room, an exhaust port for exhausting outside, and an air supply opening for supplying air to a space to be air-conditioned. A gas-liquid contact type first heat exchanger that exchanges heat between exhaust air and the first heat medium, a second heat exchanger that exchanges heat between the first heat medium and the second heat medium, and a compressor A first heat medium circulating path including at least an expansion valve, an expansion valve, and a switching valve means for switching a circulation direction of the first heat medium, and a third heat for exchanging heat between supply air and the second heat medium. A second heat medium circulation path including at least an exchanger, the second heat exchanger, and a circulation pump;
A first air passage extending from the return air port to the air supply port through the third heat exchanger, and communicating with the outside air intake;
A second air flow path that merges with the first air flow path on the upstream side of the heat exchanger, and communicates with the outside air inlet and / or the return air port to divide the flow without passing through the third heat exchanger; An air conditioner provided with at least a third air flow path communicating with the exhaust port through the first heat exchanger in a body of the air conditioner; And a sensor for detecting a temperature or a pressure at each of a discharge position and a suction position of the first heat medium of the compressor.
A compressor capacity control device of the air conditioner is provided by providing a capacity control means for controlling the capacity of the compressor to the capacity variable means according to the state of the temperature or the pressure of the heat medium.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an example of an air heat source type air conditioner using a compressor capacity control device according to the present invention.

As shown in FIG. 1, components such as a heat pump circuit constituting an air heat source type air conditioner are housed in a casing C having a predetermined shape selected according to an installation location. In the casing C, an outside air intake OA for taking in outside air, a return air opening RA for taking in return air from the room, an exhaust opening EA for exhausting to the outside, and an air supply opening for supplying air to the air-conditioned space. SA is provided, and it is possible to supply and exhaust predetermined air from air flow paths AF1, AF2, and AF3, which will be described later, formed in the casing C via a predetermined air supply and exhaust facility such as a duct.

Inside the casing C, there is provided a first heat medium circuit (a heat pump circuit using a heat medium utilizing a gas-liquid phase change, such as a CFC-based refrigerant or ammonia) which constitutes a heat pump circuit. Circuit ") and a second heat medium circulation path for forming conditioned air (a circuit using water or antifreeze as a heat medium, and may hereinafter be referred to as" brine circuit "). A spray water supply device for supplying spray water to a gas-liquid contact type first heat exchanger EX1 described later (a circuit for cooling the first heat exchanger EX1 when it acts as a condenser. "Cooling water circuit").

First, the first heat medium circulation path (refrigerant circuit) constituting the heat pump circuit will be described. The first heat medium circulation path is a gas-liquid contact type first heat exchange circuit that exchanges heat with exhaust air.
The heat exchanger EX1, the compressor COM, the four-way valve QV, and the second heat exchanger E for performing heat exchange between the first heat medium and the second heat medium.
X2, the first expansion valve EV1, the second expansion valve EV2, and the liquid separator AC are connected by a pipe, and by switching the four-way valve QV, a predetermined refrigerant is circulated in a predetermined direction to circulate a predetermined refrigerant. It constitutes a heat pump circuit. The mechanical first expansion valve EV1 and the second expansion valve EV2 are provided with bypass paths in which the check valves V1 and V2 are inserted, and the expansion valves through which the refrigerant passes according to the circulation direction of the refrigerant. It is possible to choose. With this configuration, the first
During the heating operation, the heat medium circulation path switches the four-way valve QV to transfer the refrigerant from the compressor COM → the four-way valve QV → the second heat exchanger (condenser) EX2 → the check valve V1 → the second expansion valve EV2 → First heat exchanger (evaporator) EX1 → Four-way valve Q
By sequentially circulating V → liquid separator AC → compressor COM, it is possible to supply warm heat to a brine circuit described later. On the other hand, during the cooling operation, the refrigerant is changed from the compressor COM to the four-way valve QV to the first heat exchanger (condenser) EX1 to the check valve V2 by switching the four-way valve QV.
→ 1st expansion valve EV1 → 2nd heat exchanger (evaporator) EX2 →
By sequentially circulating the four-way valve QV → the liquid separator AC → the compressor COM, it is possible to supply cold heat to a brine circuit described later.

Next, the second heat medium circulation path (brine circuit) will be described. The second heat medium circulation path is connected to a second heat exchanger EX2 that exchanges heat with the first heat medium (refrigerant). , A third heat exchanger EX3 that performs heat exchange between air and a second heat medium (brine), a pump P1, and a heat storage tank HB. Then, according to the operation mode of the heat pump circuit, the second heat exchanger EX2 obtains hot or cold heat, and the third heat exchanger EX3 heats or cools the supply air, thereby performing optimal temperature control.

In the heat storage tank HB, a heat exchange coil EX connected in series with the third heat exchanger EX3 of the second heat medium circulation path is provided.
4 are arranged. By connecting the heat exchangers in series, the configuration is simplified as compared with the arrangement of the heat exchangers disclosed in JP-A-7-198161. In the second heat medium circulation path, valves V3 to
A desired circulation path can be formed by appropriately opening and closing these valves V3 to V6. That is, when heat is stored in the heat storage tank HB using inexpensive power at night, the valves V3 and V6 are closed, the valves V4 and V5 are opened, and the heat exchange with the second heat exchanger EX2 is performed. The exchange coil EX4 is connected in series. On the other hand, when the heat stored in the heat storage tank HB is recovered, the valves V4 and V6 are closed and the valves V3 and V5 are opened, so that the second heat medium is transferred to the heat exchange coil EX4.
→ The second heat exchanger EX2 → the third heat exchanger EX3 are sequentially circulated. Also, the compressor COM is operated, and the second heat exchanger EX is operated.
The heat stored in the heat storage tank HB can be recovered (taken out) while cooling or heating the second heat medium in Step 2. When there is no heat stored in the heat storage tank HB or when it is not necessary to take out heat, the valves V4 and V5 are closed and the valves V3 and V6 are opened, so that heat exchange of the heat storage tank HB is performed. It is also possible to bypass the heater coil EX4.

Next, the air flow path formed in the casing C will be described. In the air conditioner, three air flow paths AF1, AF2, and AF3 are mainly formed in the casing C. The first air flow path AF1 includes a return air port RA and an air supply port SA.
And a filter F2 for removing dust in the air and a damper RD for adjusting the amount of air. The second air flow path AF2 is an air flow path connecting the outside air intake OA and the first air flow path AF1, and the filter F1 and the damper OD are interposed in the middle. Further, the third air flow path AF3 is connected to the exhaust port EA and the first
This is an air flow path connecting the air flow path AF1. However, the third
The air flow path AF3 is a second air flow path AF2 for introducing outside air.
It is connected to the first air flow path AF1 at a position closer to the return air port RA. An exhaust fan EF is installed near the exhaust port EA, and an air supply fan SF is installed near the air inlet SA.

Next, a compressor capacity control device of the compressor COM will be described. That is, this compressor capacity control device
An inverter (capacity variable means) INV for changing the capacity of the compressor COM; sensors SE1 and SE2 attached to the heat and discharge positions of the heat medium of the compressor COM to detect the pressure of the heat medium; SE1, SE2
And a capacity control means QC for inputting a pressure detection signal from the inverter and outputting a control signal to the inverter INV.

Here, the capacity control means QC determines, based on the input signals from the two sensors SE1 and SE2 and the compressor rotation speed inputted from the inverter INV, that the heat pump circuit has a maximum value within the operation limit range of the compressor COM. An inverter frequency for holding the output is obtained, and the capacity of the compressor COM is controlled by controlling the inverter INV so as to have the obtained inverter frequency.

First, the operation of the entire air conditioner will be briefly described. First, the air taken in from the outside air intake OA and supplied to the air-conditioned space from the air supply port SA is taken into the casing C from the return air port RA.
Then, by driving the exhaust fan EF, a part of the return air is sent to the gas-liquid contact type first heat exchanger EX1 via the third air flow path AF3, where the first heat medium (refrigerant) and Heat exchanged. By driving the first heat medium circulation path (refrigerant circuit) in a predetermined mode (heating mode or cooling mode), hot or cold heat is supplied to the second heat medium circulation path (brine circuit), and the third heat medium is cooled. The outside air and / or return air flowing through the first air flow path AF1 is heated or cooled to a desired temperature by the exchanger EX3 and supplied to the air-conditioned space. As described above, the heat pump mechanism of the present air conditioner uses the exhaust air substantially equal to or less than the taken-in outside air amount as a heat source. Do not use as Therefore,
It is possible to construct a completely independent decentralized air heat source type air conditioner that apparently does not require a heat source. Also, since the heat medium circulation path is configured for each of the heat source and air conditioning,
For example, the degree of freedom of the device configuration is increased, for example, the restriction on the arrangement of the second heat exchanger EX2 is eased. In addition, the first,
Since each of the second heat medium circulating devices can independently control the rotation speed of the pump, a well-known control method is used to select an operation mode that is optimal in response and energy saving among various operation modes. it can.

Next, some operation modes will be briefly described.

(Cold Storage Mode) When cold heat is stored in the heat storage tank HB as ice or cold water, the second heat exchanger EX2 is used as an evaporator to cool the second refrigerant in the first heat medium circulation path. (1) Third heat exchanger EX1 as condenser
It is configured to radiate heat to the air flowing through the air flow path AF3.

(Hot water heat storage mode) When heat is stored in the heat storage tank HB as hot water, on the contrary, in the first heat medium circulation path, the first heat exchanger EX1 is used as the evaporator and the third air flow path AF3 is used. It is configured to cool the flowing air and radiate heat to the second heat medium using the second heat exchanger EX2 as a condenser.

(Cooling heat storage mode) When a cooling load is required in the space to be air-conditioned, in the second heat medium circulation path, the cold storage heat is released from the heat storage tank HB to the second heat medium, and the third heat exchange is performed. The air flowing through the first air flow path AF1 via the device EX3 is cooled. In addition, if necessary, the heat pump circuit is operated, and the second heat exchanger EX is transferred from the first heat medium to the second heat medium.
The cold can also be released via 2.

(Heating operation mode) When a heating load is required in the space to be air-conditioned, the stored heat is released from the heat storage tank HB to the second heat medium in the second heat medium circulation path, and the third heat exchange is performed. The air flowing through the first air flow path AF1 is heated via the heater EX3. If necessary, the heat pump cycle may be operated to release the heat from the first heat medium to the second heat medium via the second heat exchanger EX2.

Next, the operation of the compressor capacity control device for the compressor COM according to the present invention will be described.

[Ice heat storage operation] As described above, the ice heat storage operation is performed by connecting the first heat exchanger EX1 to the condenser and the second heat exchanger EX2.
Are used as evaporators. Therefore, the heat medium discharged from the compressor COM is directed to the first heat exchanger EX1, and the heat medium discharged from the second heat exchanger EX2 is sucked into the compressor COM.

Here, the condensation pressure in the first heat exchanger EX1 is high in the early stage of the ice heat storage operation, and has a characteristic of gradually decreasing.

On the other hand, the second heat exchanger EX2 has a small amount of ice in the heat storage tank HB and a small heat resistance of the heat storage coil of the fourth heat exchanger EX4 in the early stage of the ice heat storage operation. Has a characteristic that the evaporation pressure of the first heat medium is high but gradually decreases as the amount of ice making increases.

By the way, as described in the section of [Prior Art], the compressor COM generally has a lower pressure as the suction heat medium pressure is lower.
Also, the higher the pressure of the discharge heat medium, the greater the mechanical load.

As the ice heat storage is started and the frequency of the inverter INV is increased, the discharge pressure rises and the suction pressure falls. In the initial stage of heat storage, the thermal resistance of the heat storage coil is small, so that the discharge pressure reaches the upper limit before the suction pressure reaches the lower limit. Then, when the displacement control means QC inputs that the discharge pressure detected by the sensor SE1 has risen to a predetermined value, a control signal is output to the inverter INV so that the discharge pressure does not further rise, the inverter frequency is reduced, and the compression is performed. The discharge pressure of the machine COM is controlled so as to be maintained within a predetermined pressure limit range.

Next, when the amount of ice making increases and the amount of ice making in the heat storage tank HB increases to increase the thermal resistance of the heat storage coil of the fourth heat exchanger EX4, the evaporation of the first heat medium in the second heat exchanger EX2. Since the pressure decreases and the suction pressure of the heat medium into the compressor COM decreases, the capacity control means QC inputs that the suction pressure detected by the sensor SE2 has decreased to a predetermined value. A control signal is output to the inverter INV so that the suction pressure does not decrease any more, and the inverter pressure is reduced so that the suction pressure is maintained within a predetermined pressure limit range. When the inverter frequency is lowered, the lower limit of the suction pressure allowable by the compressor COM also increases. Therefore, the suction pressure limit range of the compressor COM must be determined in consideration of this.

[Hot water heat storage operation] In the hot water heat storage operation, as described above, the first heat exchanger EX1 is connected to the evaporator and the second heat exchanger E
X2 is used as a condenser. Therefore, the heat medium discharged from the compressor COM is directed to the second heat exchanger EX2, and the heat medium discharged from the first heat exchanger EX1 is sucked into the compressor COM.

As heat storage is started and the frequency of the inverter INV is increased, the discharge pressure rises and the suction pressure falls. At the beginning of heat storage, the water temperature of the heat storage tank HB is low, so that the condensing pressure is low, and the suction pressure reaches the lower limit before the discharge pressure reaches the upper limit. Therefore, the fact that the suction pressure detected by the sensor SE2 has decreased to a predetermined value is determined by the capacity control means QC.
Is input, a control signal is output to the inverter INV so that the suction pressure does not further decrease, and the inverter frequency is controlled so that the suction pressure of the compressor COM is kept within a predetermined pressure limit range.

Next, when the heat storage amount of the hot water increases, the discharge pressure of the heat medium from the compressor COM increases. Therefore, this time, the discharge pressure detected by the sensor SE1 increases to a predetermined value. When the control means QC receives an input, a control signal is output to the inverter INV so that the discharge pressure does not further rise, the inverter frequency is reduced, and the discharge pressure of the compressor COM is maintained within a predetermined pressure limit range. Control. When the inverter frequency is lowered, the compressor COM
Therefore, the allowable upper limit value of the discharge pressure also increases, so the discharge pressure limit range of the compressor COM must be determined in consideration of this.

[Other operations] That is, for example, in a case where the heating and air-conditioning operation is performed while radiating the hot water heat storage, and it is desired to save the heat radiation of the hot water heat storage as much as possible, the maximum output is always maintained by using the heat pump circuit as a base load. You need to drive like that.

In such a case, the load state of the second heat exchanger EX2 of the heat pump circuit changes according to the change of the heat radiation temperature from the heat storage tank HB.

On the other hand, the air conditioner according to the present embodiment
Mainly uses indoor return air as heat source air,
This return air is used as heat source air in the third air flow path AF3 when the air is exhausted to the outside of the air conditioning room from another route due to the convenience of use on the room side (for example, ventilation when using the toilet). Is not available, the amount of heat source air that can be used for the first heat exchanger EX1 of the heat pump circuit decreases.

As described above, in the heat pump circuit of the air conditioner, the load of the second heat exchanger EX2 and the amount of heat source air of the first heat exchanger EX1 change unpredictably. By detecting the pressure of the heat medium on the suction side and the discharge side of the compressor COM, the inverter frequency is appropriately controlled within the operation limitation range of the compressor COM, and the maximum output of the heat pump circuit is controlled.

In the above embodiment, the compressor CO
In order to accurately detect the operation limit range of M, the compressor CO
Sensor SE for detecting pressure on each of suction side and discharge side of M
1, SE2, but instead of these, compressor C
Sensors SE1 and SE2 for detecting the temperature of the heat medium may be attached to the suction side and the discharge side of the OM, respectively.

When the pressure of the heat medium is high, the temperature is high, and when the pressure of the heat medium is low, the temperature is low.
With substantially the same control as the control of M, control can be performed so as to maintain the maximum output of the heat pump circuit within the operation limit range of the compressor COM.

The air conditioner using the compressor capacity control device according to the present invention is not limited to the air conditioner shown in FIG. 1, and for example, a heater may be installed in the heat storage tank HB of the air conditioner. Alternatively, a heater for heating the brine may be provided in the second heat medium circulation path, or a heater for heating the heat source air may be provided in the third air flow path AF3. Alternatively, a heat storage tank HB may be omitted from the second heat medium circulation path.

In the above air conditioner, the air supply port S
Although A is provided only at one place, the first air flow path AF1 may be branched so as to be provided at a plurality of places.

In short, a first heat exchanger for exchanging heat between the outside air and / or return air and the heat medium, and a second heat exchanger for exchanging heat between the heat medium and another heat medium. Any structure may be used as long as the air conditioner has a heat pump circuit including at least a compressor and an expansion valve.

Although the embodiment of the compressor capacity control apparatus according to the present invention has been described above, the present invention is not limited to this, and those skilled in the art can understand the technical idea described in the claims. It is clear that various changes and modifications can be made in the category, and it is understood that these also naturally belong to the technical scope of the present invention.

[0050]

As described above in detail, according to the compressor capacity control apparatus of the present invention, the optimum output of the heat pump circuit can be always maintained within the operation limit of the compressor. Has excellent effects.

Even if the amount of heat source air changes, the maximum output corresponding to the amount of heat source air occasionally can be exhibited.

When a heat storage tank is provided in the air conditioner,
Within a limited time, a larger amount of ice or hot water heat storage in the heat storage tank is possible. Also, when performing heating and air conditioning operation while radiating hot water heat storage from a heat storage tank with a relatively small amount of heat storage,
It is possible to efficiently cope with the air conditioning load while saving heat storage and heat radiation.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an air heat source type air conditioner using a compressor capacity control device according to the present invention.

[Explanation of symbols]

 INV Inverter (capacity variable means) SE1, SE2 Sensor QC Capacity control means C Casing (body) OA Outside air intake RA Return air outlet EA Exhaust outlet SA Inlet EX1 First heat exchanger EX2 Second heat exchanger COM Compressor EV1, EV2 Expansion valve QV switching valve means EX3 Third heat exchanger P1, P2 Circulation pump AF1 First air flow path AF2 Second air flow path AF3 Third air flow path

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Sakae Kikuchi 1-3 Garden Town Minami-Atsugi 1-3, Koku Shimotsu, Atsugi City, Kanagawa Prefecture

Claims (2)

[Claims] 1. A first heat exchanger for exchanging heat between outside air and / or return air and a heat medium, a second heat exchanger for exchanging heat between the heat medium and another heat medium, An air conditioner including a heat pump circuit including at least a compressor and an expansion valve, wherein the compressor is configured by a compressor having a variable capacity means, and a discharge position and a suction of a heat medium of the compressor are provided. A sensor for detecting a temperature or a pressure at each position, and a capacity control means for controlling the capacity of the compressor with respect to the capacity variable means in accordance with the state of the temperature or pressure of the heat medium input from these sensors A compressor capacity control device for an air conditioner, comprising: 2. An outside air intake for taking in outside air, a return air opening for taking in return air from a room, an exhaust port for exhausting outside, an air supply port for supplying air to a space to be air-conditioned, and exhaust air. A gas-liquid contact type first heat exchanger for exchanging heat with the first heat medium, a second heat exchanger for exchanging heat between the first heat medium and the second heat medium, a compressor, and an expansion valve A first heat medium circulation path comprising at least a switching valve means for switching a circulation direction of the first heat medium; a third heat exchanger for exchanging heat between supply air and the second heat medium. A second heat medium circulation path including at least the second heat exchanger and a circulation pump; a first air flow path from the return air port to the air supply port via the third heat exchanger; Communicating with the outside air intake, the third
A second air flow path that merges with the first air flow path on the upstream side of the heat exchanger, and communicates with the outside air inlet and / or the return air port to divide the flow without passing through the third heat exchanger; An air conditioner provided with at least a third air flow path communicating with the exhaust port via the first heat exchanger in a body of the air conditioner; And a sensor for detecting the temperature or pressure at each of the discharge position and the suction position of the first heat medium of the compressor, and the temperature or pressure of the first heat medium input from these sensors. A capacity control means for controlling the capacity of the compressor with respect to the capacity variable means according to the state of the compressor.