JP2015010733A - Heat pump air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump air conditioner of high cooling performance by effectively utilizing a heat storage tank used in defrosting, even in a cooling operation.SOLUTION: A heat pump air conditioner is composed of a heat storage tank 10 incorporating a storage heat exchanger 11 exchanging heat between a heat storage material 12 storing heat generated in a compressor 1 and a refrigerant in defrosting, a drain flow channel 15 for guiding the dehumidification water discharged from an indoor heat exchanger 5 in a cooling operation, to the heat storage tank 10, and a drain heat exchanger 16 exchanging heat between the dehumidification water from the drain flow channel and the heat storage material. Cooling performance can be improved by lowering a temperature of the compressor by cooling the heat stored in the heat storage material by utilizing the dehumidification water in the cooling operation.

Description

  The present invention relates to a heat pump air conditioner having a heat storage tank that exchanges heat between a heat storage material that accumulates heat generated by a compressor and a refrigerant during defrosting.

  In general, when a heat pump air conditioner is frosted on an outdoor heat exchanger during heating operation, the four-way valve is switched from a heating cycle to a cooling cycle to perform defrosting. In this defrosting method, although the indoor fan is stopped, there is a drawback that a feeling of heating is lost because cold air is gradually discharged from the indoor unit.

  Therefore, a heat pump air conditioner has been proposed in which a heat storage device is provided in the compressor provided in the outdoor unit, and defrosting is performed using the waste heat of the compressor stored in the heat storage tank during the heating operation. (For example, refer to Patent Document 1).

JP 2012-087945 A

  However, the heat pump air conditioner performs non-stop defrosting capable of continuing heating operation even during defrosting by accumulating heat generated in the compressor and using the accumulated heat for defrosting during heating operation. However, the heat storage tank was not effectively used during the cooling operation.

  The present invention has been made in view of these points, and an object of the present invention is to provide a heat pump air conditioner having high cooling performance by effectively using a heat storage tank even during cooling operation.

  To achieve the above object, the present invention provides a heat pump air conditioner having a refrigerant circuit connected in the order of a compressor, a four-way valve, an indoor heat exchanger, an expansion device, an outdoor heat exchanger, the four-way valve, an accumulator, and the compressor. A heat storage tank having a built-in heat storage heat exchanger that exchanges heat between the heat storage material that accumulates heat generated by the compressor and the refrigerant during defrosting, and dehumidified water discharged from the indoor heat exchanger during cooling operation Is provided with a drain channel for guiding the heat to the heat storage tank, and a drain heat exchanger for exchanging heat between the dehumidified water from the drain channel and the heat storage material.

  Thereby, the heat accumulated in the heat storage material can be cooled using the dehumidified water during the cooling operation, and the cooling performance can be improved.

  According to the present invention, since the heat accumulated in the heat storage material can be cooled by the dehumidified water during the cooling operation, the compressor can be cooled, so that the cooling performance can be improved.

The block diagram of the heat pump air conditioner in Embodiment 1 of this invention

  The heat pump air conditioner according to the first embodiment of the present invention includes a compressor, a four-way valve, an indoor heat exchanger, an expansion device, an outdoor heat exchanger, the four-way valve, an accumulator, and a refrigerant connected in this order. In a heat pump air conditioner having a circuit, a heat storage tank having a built-in heat storage heat exchanger for exchanging heat between a heat storage material that accumulates heat generated by the compressor and a refrigerant during defrosting, and the indoor heat exchanger during cooling operation And a drain heat exchanger for exchanging heat between the dehumidified water from the drain flow path and the heat storage material. The heat accumulated in the heat storage material can be dissipated using the dehumidified water during operation to cool the compressor, and the cooling performance can be improved.

  In the heat pump air conditioner according to the first embodiment, the second embodiment of the present invention has a drain compressor heat exchanger that can directly exchange heat between the dehumidified water and the compressor, Thereby, even in a state where sufficient waste heat is not stored in the heat storage material, the compressor can be directly cooled by the dehumidified water, and the cooling performance can be improved.

  Hereinafter, embodiments of the present invention will be described. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a configuration diagram of a heat pump air conditioner according to Embodiment 1 of the present invention.

  The heat pump air conditioner in the first embodiment includes a compressor 1 that compresses refrigerant, a four-way valve 2 that switches a refrigerant circuit between cooling operation and heating operation, a condenser during cooling, an evaporator during heating, and heat of the refrigerant and outside air. The outdoor heat exchanger 3 to be exchanged, the outdoor fan 8 for promoting heat exchange between the refrigerant flowing in the outdoor heat exchanger 3 and the outside air, the expansion device 4 for depressurizing the refrigerant, and the evaporator for exchanging the heat of the refrigerant and the indoor air. The refrigerant circuit is composed of an indoor heat exchanger 5 that becomes a condenser during heating, an indoor fan 9 that promotes heat exchange between the refrigerant flowing in the indoor heat exchanger 5 and room air, and an accumulator 6 that is connected to the suction side of the compressor 1. Is formed.

  Further, around the compressor 1, a heat storage material 12 for storing heat from the compressor 1 and a heat storage heat exchanger 11 for exchanging heat with a refrigerant to take out the heat stored in the heat storage material 12 are incorporated. A tank 10 is installed.

  And, by the flow path switching means 7 installed between the outdoor heat exchanger 3 and the four-way valve 2, one is a normal circuit 25 connected to the accumulator 6, and the other is through the heat storage heat exchanger 11 and the accumulator 6. The heat storage circuit 26 connected to is provided.

  The drain receiver 13 for receiving dehumidified water that adheres to and is discharged from the indoor heat exchanger 5 during the cooling operation is provided with a drain flow path 15 that guides the drain water 14 in the drain receiver 13 to the heat storage tank 10. A drain heat exchanger 16 for exchanging heat with the heat storage material 12 and a drain compressor heat exchanger 17 for exchanging heat directly with the compressor 1 are provided downstream of the drain passage 15.

  The outdoor unit 22 includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, an expansion device 4, an accumulator 6, a flow path switching unit 7, a heat storage tank 10, an outdoor fan 8, a drain heat exchanger 16, and a drain compressor. The indoor unit 21 includes an indoor heat exchanger 5, an indoor fan 9, and a drain receiver 13. The outdoor unit 22 and the indoor unit 21 include a liquid side connecting pipe 23, a gas side connecting pipe 24, and a drain. They are connected by a flow path 15.

  The operation of the heat pump air conditioner configured as described above will be described. In the description of the operation, the operation during the cooling operation, which is a feature of the present invention, will be mainly described.

  During the cooling operation, the refrigerant compressed by the compressor 1 becomes a high-temperature and high-pressure refrigerant, passes through the four-way valve 2, and is sent to the outdoor heat exchanger 3 through the flow path switching means 7. Then, the outdoor fan 8 promotes heat exchange with the outside air to dissipate heat and becomes a high-pressure liquid refrigerant that is sent to the expansion device 4. In the expansion device 4, the pressure is reduced to form a low-temperature and low-pressure two-phase refrigerant, which is sent to the indoor heat exchanger 5 through the liquid connection pipe 23.

  The indoor air sucked by the indoor fan 9 passes through the indoor heat exchanger 5 to exchange heat with the refrigerant, and the refrigerant absorbs the heat of the indoor air and evaporates to become a low-temperature gas refrigerant. At this time, the indoor air absorbed by the refrigerant has a reduced temperature and humidity and is blown into the room by the indoor fan 9 to cool the room. Further, the gas refrigerant passes through the gas side connection pipe 24 and enters the four-way valve 2 and returns to the compressor 1 through the accumulator 6.

  At this time, the temperature and humidity of the indoor air absorbed by the refrigerant decreases, that is, moisture in the air condenses and adheres to the surface of the indoor heat exchanger 5 as a drain as dehumidified water. The attached drain falls by gravity and accumulates in the drain receiver 13.

  Further, the drain water 14 accumulated in the drain receiver 13 is sent to the outdoor unit 22 through the drain channel 15. The drain water 14 sent to the outdoor unit 22 flows through the drain heat exchanger 16 and the drain compressor heat exchanger 17 attached downstream of the drain flow path 15 and is discharged to the outside.

  Here, the drain water 14 that has passed through the drain heat exchanger 16 absorbs the heat of the heat storage material 12 to lower the temperature of the heat storage material 12, and further the heat storage tank 10 and the compressor 1 that contain the heat storage material 12. As a result, the temperature of the compressor 1 is lowered. Further, the drain water 14 that has passed through the drain compressor heat exchanger 17 directly absorbs the heat of the compressor 1 and lowers the temperature of the compressor 1.

  Even if the heat pump air conditioner is shortly after startup, even if the heat storage amount of the heat storage material 12 is small and the temperature is not high, the temperature of the compressor 1 rises quickly, so that the drain water passing through the drain compressor heat exchanger 17 is heated. The temperature of the compressor 1 can be lowered by replacement.

  Thus, since the temperature of the compressor 1 is lowered regardless of which route the drain water 14 passes, the discharge temperature of the compressor 1 can be lowered and the discharge pressure can be lowered. Therefore, the efficiency during the cooling operation of the heat pump air conditioner can be improved.

  Further, the refrigerant compressed by the compressor 1 at the start of the heating operation becomes a high-temperature and high-pressure refrigerant, passes through the four-way valve 2, and is sent to the gas connection pipe 24. The indoor air sucked by the indoor fan 9 passes through the indoor heat exchanger 5 and exchanges heat with the refrigerant, and the refrigerant dissipates heat to the indoor air and condenses to become a high-pressure liquid refrigerant. At this time, the indoor air absorbs the heat of the refrigerant and is blown into the room by the indoor fan 7 in a state where the temperature is raised, thereby heating the room. Thereafter, the refrigerant is sent to the expansion device 4 through the liquid connection pipe 23, is decompressed in the expansion device 4 to become a low-temperature and low-pressure two-phase refrigerant, is sent to the outdoor heat exchanger 3, and is heated to the outside air and heat by the outdoor fan 8. The exchange is promoted to evaporate and is returned to the compressor 1 through the accumulator 6 via the flow path switching means 7 and the four-way valve 2 connected to the normal circuit 25.

  As described above, this heat pump air conditioner has a drain flow path 15 that guides the dehumidified water discharged from the indoor heat exchanger 5 during the cooling operation to the heat storage tank 10, and drain heat that performs heat exchange between the dehumidified water and the heat storage material 12. By providing the exchanger 16, the cooling performance can be improved by cooling the heat accumulated in the heat storage material 12 with dehumidified water and lowering the temperature of the compressor 1.

  In this embodiment, the drain compressor heat exchanger 17 capable of directly exchanging heat between the dehumidified water and the compressor 1 is further installed, so that sufficient waste heat is not stored in the heat storage material 12, Since the compressor 1 can be directly cooled with dehumidified water, the cooling performance can be improved.

  In the embodiment of the present invention, the drain heat exchanger 16 and the drain compressor heat exchanger 17 are described as being used at the same time. However, only one of them may be provided, or either one may be provided. Only it may be used alone.

  INDUSTRIAL APPLICABILITY The present invention can provide a heat pump air conditioner having high cooling performance by effectively using a heat storage tank, and can be widely applied to a heat pump air conditioner for business use as well as general use.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Throttle device 5 Indoor heat exchanger 6 Accumulator 10 Thermal storage tank 11 Thermal storage heat exchanger 12 Thermal storage material 15 Drain flow path 16 Drain heat exchanger 17 Drain compressor heat exchanger

Claims (2)

In a heat pump air conditioner having a refrigerant circuit connected in the order of a compressor, a four-way valve, an indoor heat exchanger, an expansion device, an outdoor heat exchanger, the four-way valve, an accumulator, and the compressor, heat generated in the compressor A heat storage tank having a built-in heat storage heat exchanger for exchanging heat between the heat storage material and the refrigerant during defrosting, and a drain channel for leading dehumidified water discharged from the indoor heat exchanger to the heat storage tank during cooling operation A heat pump air conditioner provided with a drain heat exchanger for exchanging heat between the dehumidified water from the drain flow path and the heat storage material. The heat pump air conditioner according to claim 1, further comprising a drain compressor heat exchanger capable of directly exchanging heat between the dehumidified water and the compressor.

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