JP2007321995A - Refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem with a conventional multi-functional refrigerating cycle device, in which it is subjected to spatial restriction in installing an outdoor air heat exchanger, through high efficiency can be achieved. <P>SOLUTION: This refrigerating cycle device is constituted by connecting a compressor 101, a first heat exchanger 102, a throttle device 104, an indoor heat exchanger 105 and a second heat exchanger 106. As simultaneous hot water supplying and cooling/heating operations can be performed without disposing the outdoor air heat exchanger by applying this constitution, a space can be saved while keeping high efficiency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle apparatus adapted to a plurality of uses such as hot water supply and air conditioning, and is characterized in that air conditioning and hot water supply are performed without providing an outdoor air heat exchanger.

Conventionally, in the case of a multi-functional refrigeration cycle apparatus that combines hot water supply and air conditioning, a water heat exchanger is provided in parallel with an outdoor air heat exchanger during cooling for the purpose of improving efficiency, and this water heat exchanger A means for reducing the amount of heat absorbed by the outdoor air heat exchanger by making hot water by heating water and flowing the remaining hot water to the water heat exchanger during heating is used. FIG. 4 shows a refrigeration cycle apparatus configuration for solving such a problem. (For example, refer to Patent Document 1).
Japanese Utility Model Publication No. 57-16766 (Fig. 2)

  However, although such a system can achieve high efficiency, there is a problem that space restriction is imposed in order to provide an outdoor air heat exchanger. In addition, during heating, the outdoor air heat exchanger becomes an evaporator, so that low-temperature cold water is produced, and there is a problem that the conventional configuration cannot be used effectively.

  Then, this invention is made | formed for the purpose of performing simultaneous operation | movement of hot-water supply and air-conditioning, without providing an outdoor air heat exchanger.

  In order to solve the conventional problem, a refrigeration cycle apparatus according to the present invention radiates heat from a compressor that compresses a first refrigerant, the first refrigerant compressed by the compressor, and heats the second refrigerant. A first heat exchanger that performs heating, a throttling device that depressurizes the first refrigerant radiated by the first heat exchanger, an indoor heat exchanger, and a first refrigerant that is depressurized by the throttling device. And a second heat exchanger that cools the third refrigerant, and at the time of cooling, the compressor, the first heat exchanger, the expansion device, the indoor heat exchanger, and the second heat exchanger The first refrigerant is connected so as to circulate in this order, and in the indoor heat exchanger, the first refrigerant decompressed by the expansion device is heated and indoor air is cooled. , The first heat exchanger, the indoor heat exchanger, the expansion device, and the second heat exchanger Connected in this order, in the indoor heat exchanger, a device for heating the indoor air as well as further cooling the cooled first refrigerant in the first heat exchanger.

  Here, examples of the first refrigerant include chlorofluorocarbon or carbon dioxide. Examples of the second refrigerant or the third refrigerant are water or brine.

  With this configuration, it is possible to simultaneously operate hot water supply and air conditioning without providing an outdoor air heat exchanger.

  More preferably, in the refrigeration cycle apparatus of the present invention, the second refrigerant and the third refrigerant are the same refrigerant, and are provided on the outlet side of the second refrigerant of the first heat exchanger. And a bypass circuit that connects the three-way valve and the inlet side of the third refrigerant of the second heat exchanger via a flow control valve.

  With this configuration, it is possible to optimally control the third refrigerant temperature on the outlet side of the second heat exchanger.

  According to the refrigeration cycle apparatus of the present invention, since simultaneous operation of hot water supply and air conditioning can be performed without providing an outdoor air heat exchanger, it is possible to save space while maintaining high efficiency.

  Hereinafter, embodiments of the refrigeration cycle apparatus of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a configuration diagram showing a refrigeration cycle apparatus according to Embodiment 1 of the present invention.

  In the refrigeration cycle apparatus of the first embodiment, for example, a refrigerant such as chlorofluorocarbon or carbon dioxide is used as a working fluid, and a compressor 101 that pressurizes the refrigerant, and a first high-temperature and high-pressure refrigerant that is pressurized by the compressor 101 are cooled. Heat exchanger 102, four-way valve 103 as means for switching between air conditioning and heating, expansion device 104 for decompressing and expanding the cooled refrigerant, indoor heat exchanger 105, and second heat for heating the decompressed refrigerant A refrigeration cycle circuit in which the exchanger 106 is connected by piping is configured.

  First, the operation during cooling will be described.

  The high-temperature and high-pressure refrigerant boosted by the compressor 101 heats water or brine in the first heat exchanger 102. The heated water or brine is used for hot water supply or the like. Thereafter, the refrigerant flowing into the four-way valve 103 flows in the direction of the solid line and is decompressed and expanded by the expansion device 104. The refrigerant is heated by cooling the indoor air in the indoor heat exchanger 105, passes through the four-way valve 103 again, and then the water or brine is cooled in the second heat exchanger 106. This cooling water or cooling brine is used for freezing and refrigeration applications such as a refrigerator.

  Next, the operation during heating will be described.

  The high-temperature and high-pressure refrigerant boosted by the compressor 101 heats water or brine in the first heat exchanger 102. The heated water or brine is used for hot water supply or the like. Thereafter, the refrigerant flowing into the four-way valve 103 flows in the direction of the broken line, dissipates heat by heating the indoor air in the indoor heat exchanger 105, and decompresses and expands in the expansion device 104. Then, after passing through the four-way valve 103 again, the refrigerant is further heated by the second heat exchanger 106 to cool water or brine. This cooling water or cooling brine is used for freezing and refrigeration applications such as a refrigerator.

  As described above, hot water and cold water can be supplied while performing air conditioning without providing an outdoor air heat exchanger.

(Embodiment 2)
FIG. 2 is a block diagram showing a refrigeration cycle apparatus according to Embodiment 2 of the present invention. The difference between the second embodiment and the first embodiment is that the outlet side water circuit 108 of the first heat exchanger 102 has a three-way valve 113 and the outlet side water circuit of the second heat exchanger 106. 110, a water temperature detecting means 114 is provided, a bypass circuit 111 is provided for connecting the three-way valve 113 and the inlet side water circuit 109 of the second heat exchanger 106 via a flow control valve 112, and the second The outlet side water or brine cooled by the heat exchanger 106 is bypassed to the inlet side water circuit 109 of the second heat exchanger 106.

  When cooling is necessary, such as in the summer, there is no particular problem with the configuration of the first embodiment. However, when the heating or hot water supply load is much higher than the refrigeration load, such as in the winter, the second heat exchanger There is a problem that the outlet-side water temperature of 106 is extremely lowered.

  In the second embodiment, the outlet water temperature of the second heat exchanger 106 is optimally controlled by controlling the refrigerant flow rate in the bypass circuit 111.

  The operation of the second embodiment will be described using the flowchart of FIG.

  When the operation of the refrigeration cycle apparatus is started by turning on the switch of the remote controller or the like, the process proceeds to step 201 to determine whether the operation mode is cooling or heating. In the case of the cooling mode, the process proceeds to step 202, and the four-way valve 103 is switched so that the flow direction of the refrigerant becomes the solid line direction shown in FIG. In the case of the heating mode, the process proceeds to step 203, and the four-way valve 103 is switched to proceed to step 204 so that the flow direction of the refrigerant is in the direction of the broken line shown in FIG.

  In step 204, the water temperature Tw is detected by the water temperature detection means 114 provided in the outlet side water circuit 110 of the second heat exchanger 106, and the water temperature Tw and the set water temperature Th are compared. And when water temperature Tw is larger than preset water temperature Th, it has shown that the heating load of a refrigerating cycle is not excessive. In this case, the process proceeds to step 206. Further, when the water temperature Tw is lower than the set water temperature Th, it indicates that the heating load of the refrigeration cycle is excessive, and the routine proceeds to step 205.

  In step 205, after opening the flow control valve 112, the routine proceeds to step 207. In step 207, the three-way valve 113 is switched so that the refrigerant flow is in the direction B in FIG. 2, and the hot water flowing through the outlet side water circuit 108 of the first heat exchanger 102 is passed through the bypass circuit 111. It controls so that it may flow into the inlet side water circuit 109 of the 2nd heat exchanger 106. FIG. As a result, the water temperature in the outlet side water circuit 110 of the second heat exchanger 106 can be increased, so that effective cooling can be achieved and the refrigerant temperature of the second heat exchanger 106 can also be increased. Therefore, the required power of the compressor 101 is reduced, and the efficiency of the refrigeration cycle apparatus can be increased.

  In step 206, the flow control valve 112 is fully closed, and then the process proceeds to step 208. In step 208, the three-way valve 113 is switched so that the refrigerant flow is in the direction A in FIG. 2, and control is performed so that the refrigerant does not flow into the inlet side water circuit 109 of the second heat exchanger 106.

  As described above, the second heat exchange is performed by flowing the outlet-side high-temperature water of the first heat exchanger 102 to the inlet-side water circuit 109 of the second heat exchanger 106 via the bypass circuit 111. Since the outlet side water temperature of the vessel 106 can be controlled, it is possible to reliably cope with the cooling application while achieving high efficiency.

  The flow rate control valve 112 may be replaced with an on / off valve that controls ON / OFF, instead of a valve that finely controls the refrigerant flow rate. Furthermore, the flow path direction may be switched using only the three-way valve 113 without using the flow control valve 112.

Further, the expansion device 104 may be replaced with a device provided with a power recovery mechanism such as an expander.

  The refrigeration cycle apparatus according to the present invention can be used for air conditioners, water heaters, floor heaters, bathroom dryers, refrigeration apparatuses, refrigeration apparatuses, and the like.

The block diagram which shows the refrigerating-cycle apparatus in Embodiment 1 of this invention. The block diagram which shows the refrigerating-cycle apparatus in Embodiment 2 of this invention. Control flowchart of refrigeration cycle apparatus in Embodiment 2 of the present invention Configuration diagram showing a prior art refrigeration cycle apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Three-way valve 3 Outdoor heat exchanger 4 Heating decompressor 5 Cooling decompressor 6 Indoor heat exchanger 7, 8, 10 Solenoid valve 9 Heat exchanger in water tank 11 Water tank 12 Bypass pipe 15, 16 Joint DESCRIPTION OF SYMBOLS 101 Compressor 102 1st heat exchanger 103 Four-way valve 104 Expansion apparatus 105 Indoor heat exchanger 106 2nd heat exchanger 107 Inlet side water circuit of 1st heat exchanger 108 Outlet of 1st heat exchanger Side water circuit 109 Inlet side water circuit of the second heat exchanger 110 Outlet side water circuit of the second heat exchanger 111 Bypass circuit 112 Flow control valve 113 Three-way valve 114 Water temperature detecting means

Claims (3)

A compressor for compressing the first refrigerant;
A first heat exchanger that radiates heat of the first refrigerant compressed by the compressor and heats the second refrigerant;
A throttle device for depressurizing the first refrigerant radiated by the first heat exchanger;
An indoor heat exchanger,
A second heat exchanger that heats the first refrigerant decompressed by the expansion device and cools the third refrigerant;
During cooling, the compressor, the first heat exchanger, the expansion device, the indoor heat exchanger, and the second heat exchanger are connected so that the first refrigerant circulates in this order, and the indoor heat In the exchanger, the first refrigerant decompressed by the expansion device is heated and the indoor air is cooled,
During heating, the compressor, the first heat exchanger, the indoor heat exchanger, the expansion device, and the second heat exchanger are connected so that the first refrigerant circulates in this order, and the indoor heat In the exchanger, the refrigeration cycle apparatus further cools the first refrigerant cooled in the first heat exchanger and heats indoor air. The second refrigerant and the third refrigerant are the same refrigerant,
A three-way valve provided on the outlet side of the second refrigerant of the first heat exchanger;
A bypass circuit that connects the three-way valve and the inlet side of the third refrigerant of the second heat exchanger via a flow control valve;
The refrigeration cycle apparatus according to claim 1. Further comprising temperature detection means provided on the outlet side of the third refrigerant of the second heat exchanger,
Controlling the flow rate control valve based on the measured value measured by the temperature detecting means;
The refrigeration cycle apparatus according to claim 2.

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