JP2006002952A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve COP by using exhaust heat in a room. <P>SOLUTION: This air conditioner has a compressor 18, a heat source side heat exchanger 21, and a use side heat exchanger 25. The heat source side heat exchanger 21 has a heat exchange part 21B used in cooling operation for cooling a refrigerant, and this heat exchange part 21B has an inside air exhaust part 52 for exhausting indoor air as an air heat source. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an air conditioner that exhausts indoor air.

In general, an air conditioner that includes a compressor, a heat source side heat exchanger, and a use side heat exchanger and enables a cooling operation is known. In this type of air conditioning apparatus, there is an apparatus that exhausts indoor air that is a conditioned room and ventilates the room by taking outdoor air into the room (for example, see Patent Document 1).
JP 2000-186840 A

  However, in the above air conditioner, during the cooling operation, indoor air having a temperature lower than the outside air is exhausted to the outside of the room, so that the indoor heat load increases, and the compressor increases with the increase in the heat load. There has been a problem that the power consumption in the process increases and the COP decreases.

  Accordingly, an object of the present invention is to provide an air conditioner that can solve the above-described problems of the prior art and can improve COP by utilizing exhaust heat in the room.

  In order to solve the above-described problems, the present invention provides an air conditioner including a compressor, a heat source side heat exchanger, and a use side heat exchanger, wherein the heat source side heat exchanger is used during cooling operation to supply a refrigerant. A heat exchanging part for cooling is provided, and the air exchanging means for exhausting indoor air as an air heat source is provided in the heat exchanging part.

  In this air conditioner, the inside air discharge means may include a total heat exchanger, and the indoor air heat-exchanged by the total heat exchanger may be guided to the heat exchange unit.

  Further, in the above air conditioner, the heat source side heat exchanger includes a plurality of heat exchange units, and the inside air discharge means supplies room air to at least one of the plurality of heat exchange units. You may make it guide.

  Furthermore, the said air conditioning apparatus WHEREIN: The said inside air discharge means may be equipped with the heat insulation duct which guides indoor air to the said heat exchanger part.

  According to the present invention, COP can be improved by effectively using exhaust heat in the room.

  Embodiments of the present invention will be described below with reference to the drawings.

[1] First Embodiment FIG. 1 is a pipeline diagram showing an air conditioner to which a first embodiment of an air conditioner according to the present invention is applied.

  As shown in FIG. 1, the air conditioner 10 includes a heat source side unit 11 and a use side unit 13. The refrigerant pipe 14 of the heat source side unit 11 and the refrigerant pipe 30 of the use side unit 13 are connected by a refrigerant pipe (liquid pipe) 16 and a refrigerant pipe (gas pipe) 17.

  The heat source side unit 11 is installed outside a room, for example, and the use side unit 13 is installed in a room which is an air-conditioned room.

  The heat source side unit 11 includes a variable capacity compressor 18, an accumulator 19, a four-way valve 20, a heat source side heat exchanger 21, and an electric expansion valve (decompressor) 22. 18, an accumulator 19 is disposed on the suction side of the compressor 18, and a four-way valve 20 is disposed on the discharge side. A heat source side heat exchanger 21 and an electric expansion valve 22 are connected to the refrigerant pipe 14 on the four-way valve 20. Connected through. Furthermore, the heat source side unit 11 includes a heat source side blower 24 that blows air to the heat source side heat exchanger 21.

  The use side unit 13 includes a use side heat exchanger 25 and an electric expansion valve (decompressor) 26, and the use side heat exchanger 25 is disposed in the refrigerant pipe 30, and the use side heat exchanger 25 is provided in the refrigerant pipe 30. An electric expansion valve 26 is disposed in the vicinity. The valve opening degree of the electric expansion valve 26 is adjusted according to the air conditioning load. Further, the use side unit 13 includes a use side blower 27 that blows air to the use side heat exchanger 25, and after the air exchanges heat with the refrigerant in the use side heat exchanger 25, the air is blown into the conditioned room. Moreover, the use side unit 13 is provided with the ventilation apparatus 50 which ventilates a room. This ventilation device 50 is housed integrally in the housing of the use side unit 13 in which the various devices 25, 26, 27, etc. for air conditioning are housed.

  The ventilator 50 includes an outside air introduction unit 51 that guides outdoor air (outside air) to the room, and an inside air discharge unit 52 that exhausts room air (inside air) to the outside of the room. Moreover, the ventilator 50 is provided with the total heat exchange element 53 as a total heat exchanger. The total heat exchange element 53 is arranged so as to straddle the outside air introduction air passage 54 of the outside air introduction portion 51 and the inside air discharge air passage 55 of the inside air discharge portion 52, and between the introduced outside air and the introduced inside air. It has a function to exchange heat. In other words, when the ventilator 50 performs the ventilation operation while the air conditioner 10 is performing the cooling operation, the total heat exchange element 53 exchanges heat between the warm outside air and the cold indoor exhaust air to remove the outside air. It is cooled and air is supplied indoors. When the ventilator 50 performs the ventilation operation while the air conditioner 10 is performing the heating operation, the total heat exchange element 53 heats the outside air by exchanging heat between the cold outside air and the warm indoor exhaust. , Indoor air supply. As a result, an increase in the indoor heat load due to the ventilation operation can be suppressed, and a decrease in air conditioning performance due to the ventilation operation can be suppressed.

  The outside air introduction unit 51 includes an air supply fan 56, an outside air filter 57, a total heat exchange element 53, and a humidifier 58 in the outside air introduction air passage 54. The outside air introduced into the outside air introduction air passage 54 via the air supply duct 59 passes through the air supply fan 56, reaches the total heat exchange element 53 via the outside air filter 57, and exchanges heat with the inside air here. It blows out into the room through a humidifier 58. A humidifying tank 58A is connected to the humidifier 58, and humidified water from the humidifying tank 58A is sequentially supplied to the humidifier 58.

  Further, the inside air discharge unit 52 includes a total heat exchange element 53, a damper 60, and an exhaust fan 61 in the inside air discharge air passage 55. The inside air guided to the inside air discharge air passage 55 reaches the total heat exchange element 53, and after it exchanges heat with the outside air, it is exhausted outside through the damper 60 and the exhaust fan 61 through the exhaust duct 62.

  The damper 60 can block the air path, and when the damper 60 is operated, the outlet of the total heat exchange element 53 in the inside air discharge air path 55 is blocked, and the inside air bypasses the total heat exchange element 53, and the normal ventilation air path The exhaust fan 61 is reached through 63 and exhausted to the outside through the exhaust duct 62.

  The heat source side unit 11 is provided with a control device 45 as control means for performing operation control of the entire air conditioner 10. Here, the control device 45 may be provided in the use side unit 13 or may be provided separately from the units 11 and 13 (for example, a remote controller).

  By the way, the heat source side heat exchanger 21 includes a plurality of (for example, two) heat exchange units 21A and 21B. These heat exchanging parts 21A and 21B are connected in series by the refrigerant pipe 14. A heat source side fan 24 is disposed adjacent to the heat exchanging portion 21A. The electric expansion valve 22 is disposed between the heat exchange unit 21A and the heat exchange unit 21B.

  Normally, when the ventilation operation is performed during the cooling operation of the air conditioner 10, the inside air temperature is lower than the outside air temperature.

  In the first embodiment, the inside air discharge unit 52 is configured to exhaust the inside air as an air heat source to the heat exchange unit 21B. The operation of exhausting the inside air to the heat exchange unit 21B is performed during the cooling operation.

  The cooling operation of the air conditioner 10 will be described. During the cooling operation of the air conditioner 10, the electric expansion valve 22 is controlled to be fully opened, and the valve opening degree of the electric expansion valve 26 is adjusted.

  In this state, the gas refrigerant discharged from the compressor 18 flows into the heat exchange part 21A of the heat source side heat exchanger 21 and condenses, and then flows into the heat exchange part 21B via the electric expansion valve 22.

  Since the cool air is blown to the heat exchanging portion 21B by the inside air discharge portion 52, the refrigerant flowing into the heat exchanging portion 21B is further cooled to be in a supercooled state. Accordingly, the refrigerant that has flowed into the heat exchanging portion 21B is sufficiently cooled to become a liquid refrigerant, so that the refrigerant can be prevented from becoming flash gas. Therefore, since the diameter of the refrigerant pipe (liquid pipe) 16 can be reduced, the cost can be reduced, and the pressure loss of the refrigerant in the refrigerant pipe 16 can be reduced.

  The liquid refrigerant that has been supercooled in the heat exchanging portion 21B is depressurized by the electric expansion valve 26 of the use side unit 13, evaporated in the use side heat exchanger 25, and cools the room.

  In this way, the refrigerant that has become the supercooled liquid enters the electric expansion valve 26 of the usage-side unit 13 and evaporates in the usage-side heat exchanger 25, so that the cooling capacity is improved. Moreover, the power consumption of the compressor 18 and the heat source side fan 24 can be suppressed. Accordingly, the COP during the cooling operation can be improved by utilizing the cold heat (exhaust heat) of the exhaust discharged to the outside.

  The refrigerant evaporated by the use side heat exchanger 25 reaches the four-way valve 20 of the heat source side unit 11 and is returned to the compressor 18 through the accumulator 19.

  In this 1st Embodiment, the inside air discharge part 52 is comprised so that the inside air heat-exchanged with the total heat exchange element 53 may be guide | induced to the heat exchange part 21B. That is, even if the inside air to be exhausted by the total heat exchanging element 53 and the outside air to be supplied to the room during the ventilation operation are heat exchanged, the inside air that has been heat exchanged by the total heat exchanging element 53 remains outside the room. The temperature is lower than the outside air temperature. For example, when the room temperature is 27 ° C. and the outside air temperature is 35 ° C., the temperature of the inside air that is heat-exchanged by the total heat exchange element 53 rises to about 30 ° C., but the outside air temperature (35 ° C. ) Is lower.

  Therefore, since the exhaust gas having a temperature lower than the outside air temperature is guided to the heat exchange unit 21B, the refrigerant flowing into the heat exchange unit 21B can be sufficiently cooled, and a more efficient cooling operation can be performed.

  Moreover, the inside air discharge part 52 is provided with the heat insulation duct 66 which guides the inside air heat-exchanged with the total heat exchange element 53 to the heat exchange part 21B. As described above, since the inside air is guided to the heat exchanging portion 21 </ b> B using the heat insulating duct 66, the heat loss of the air passing through the heat insulating duct 66 can be reduced.

  In the first embodiment, the inside air discharge unit 52 guides the indoor air heat-exchanged by the total heat exchange element 53 during the cooling operation to the heat exchange unit 21B, and performs an operation other than the cooling operation (for example, during the heating operation). A three-way valve 65 serving as switching means for exhausting the air outside is disposed on the inside air outlet side of the total heat exchange element 53.

  The three-way valve 65 includes one air inlet port and two air outlet ports. One air outlet port is connected to the heat insulation duct 66 and the other air outlet port is connected to the exhaust duct 62. Yes. Then, by the open / close control of the three-way valve 65, the inside air that has passed through the total heat exchange element 53 is guided to the heat exchanging portion 21B through the heat insulation duct 66 and exhausted to the outside or directly through the exhaust duct 62. Exhausted outside the room. The opening and closing of the three-way valve 65 is controlled by the control device 45.

  As a result, cold air from indoor ventilation is blown to the heat exchanging portion 21B during the cooling operation, so that the refrigerant can be made into a supercooled liquid in the heat source side heat exchanger 21, and the cooling capacity is improved. COP is improved.

  In the first embodiment, the temperature sensor 47 is provided in the vicinity of the suction port (not shown) for sucking the inside air of the ventilator 50 as the room temperature detecting means for detecting the room temperature. Further, a temperature sensor 48 is provided in the vicinity of an air inlet (not shown) of the heat source unit 11 as an outside air temperature detecting means for detecting the outside air temperature.

  When the air conditioning apparatus 10 is performing a ventilation operation during the cooling operation, the control device 45 determines whether or not the indoor temperature exceeds the outside air temperature (determination means). As a result of this determination, for example, when the room temperature exceeds the outside air temperature, such as when starting the air conditioner 10 in a state in which the room is closed, such as midsummer, the control device 45 is on the heat insulation duct 66 side (heat exchange unit 21B side). The three-way valve 65 is controlled so that the inside air is exhausted directly outside the room (exhaust means). Thereby, since hot air can be prevented from being blown to the heat exchanging portion 21B, a more stable cooling operation can be performed.

  In this case, it is preferable to operate the damper 60, bypass the total heat exchange element 53, and exhaust the inside air. Thereby, it can suppress that a hot air is blown indoors at the time of air_conditionaing | cooling operation, and can suppress that the air-conditioning property at the time of air_conditionaing | cooling operation falls.

[2] Second Embodiment In the first embodiment, the heat source side heat exchanger 21 includes a plurality of heat exchange units 21A and 21B, and the case where the inside air is exhausted to the heat exchange unit 21B has been described. 2 embodiment demonstrates the case where the heat source side heat exchanger 21 is comprised by one heat exchange part. FIG. 2 is a pipeline diagram showing an air conditioner to which the second embodiment is applied. Hereinafter, in this 2nd Embodiment, the part similar to the said 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  As shown in FIG. 2, the heat source side heat exchanger 21 includes one heat exchanging unit, and the inside air that has exchanged heat with the total heat exchanging element 53 during the cooling operation of the air conditioner 10 passes through the heat insulating duct 66. It is led to the heat source side heat exchanger 21. As a result, similarly to the first embodiment, since the cool air is blown to the heat source side heat exchanger 21 by the inside air discharge unit 52, the refrigerant flowing into the heat source side heat exchanger 21 is further cooled. It becomes a supercooled state. Therefore, the refrigerant that has flowed into the heat source side heat exchanger 21 is sufficiently cooled to become a liquid refrigerant, so that the refrigerant can be prevented from becoming flash gas. Therefore, since the diameter of the refrigerant pipe (liquid pipe) 16 can be reduced, the cost can be reduced, and the pressure loss of the refrigerant in the refrigerant pipe 16 can be reduced. Further, since the refrigerant that has become the supercooled liquid enters the electric expansion valve 26 of the use side unit 13 and evaporates in the use side heat exchanger 25, the cooling capacity is improved, and the COP during the cooling operation can be improved. .

  As mentioned above, although this invention was demonstrated based on one Embodiment, this invention is not limited to this.

  For example, in the first embodiment, the heat source side heat exchanger 21 includes a plurality of heat exchange units 21A and 21B, and the heat exchange unit 21B is configured to exhaust the inside air. However, the present invention is not limited thereto. Instead, it may be configured to exhaust the inside air to at least one heat exchanging unit. For example, the inside air may be exhausted to the heat exchanging unit 21A, or the inside air may be exhausted to the heat exchanging units 21A and 21B. May be.

  In the first and second embodiments, the three-way valve 65 is provided, and the three-way valve 65 is switched to exhaust the inside air to the heat exchanging portion 21B side or directly to the outside of the room. However, the present invention is not limited to this. Instead of this, a damper is provided instead of the three-way valve 65, and by switching this damper, the internal air heat exchanged by the total heat exchange element 53 is exhausted to the heat exchanging portion 21B side or directly to the outside. May be.

It is a pipe line figure showing the air harmony device to which a 1st embodiment was applied. It is a pipe line figure showing the air harmony device to which a 2nd embodiment was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air conditioning apparatus 18 Compressor 21 Heat source side heat exchanger 21A, 21B Heat exchange part 25 Use side heat exchanger 51 Outside air introduction part 52 Inside air discharge part (inside air discharge means)
54 Total heat exchange element (total heat exchanger)
66 Thermal insulation duct

Claims (4)

In an air conditioner including a compressor, a heat source side heat exchanger, and a use side heat exchanger,
The heat source side heat exchanger includes a heat exchange unit that is used during cooling operation to cool the refrigerant,
An air conditioner characterized in that the heat exchanging unit is provided with inside air discharging means for exhausting indoor air as an air heat source. In the air conditioning apparatus according to claim 1,
The air conditioner is characterized in that the inside air discharge means includes a total heat exchanger, and guides indoor air heat-exchanged by the total heat exchanger to the heat exchange unit. In the air conditioning apparatus according to claim 1 or 2,
The heat source side heat exchanger includes a plurality of heat exchange units,
The air conditioner is characterized in that the inside air discharge means guides indoor air to at least one of the plurality of heat exchange sections. In the air harmony device according to any one of claims 1 to 3,
The air conditioner characterized in that the inside air discharging means includes a heat insulation duct for guiding indoor air to the heat exchanger section.

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