JP2007139368A - Hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water supply system, capable of raising temperature of water for hot water supply in a short time, and enhancing energy saving in a store provided with, for example, cold heat equipment such as a cold showcase or the like. <P>SOLUTION: In this hot water supply system, heat exchange of water for hot water supply distributed in a hot water supply circuit 40 is performed using not only first refrigerant distributed in a first refrigerant circuit 10 but also second refrigerant distributed in a second refrigerant circuit 30. Therefore, the temperature of water for hot water supply can be raised in a short time. Further, since waste heat of the second refrigerant circuit 30 provided with the cold showcase 20 that is cold heat equipment can be used, the COP of the entire store including the hot water supply system can be improved, and the energy saving in the store provided with the cold showcase 20 can be enhanced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water supply system used for general household use or business use.

  Conventionally, a hot water supply system including a refrigerant circuit and a hot water supply circuit is known as this type of hot water supply system (see, for example, Patent Document 1). The refrigerant circuit includes a compressor, an expansion mechanism, and an air heat exchanger, and the refrigerant is in circulation. The hot water supply circuit includes a hot water storage tank and a pump, and hot water for hot water in the hot water storage tank is circulated by the pump. The hot water supply system configured in this way raises the hot water supply water flowing through the hot water supply circuit to a predetermined temperature by exchanging heat between the refrigerant discharged from the compressor and the hot water supply water flowing through the hot water supply circuit. .

On the other hand, as a cooling system installed in a store such as a convenience store, a system including a refrigerant circuit including a compressor, a condenser, an expansion valve, and an evaporator is known. This cooling system cools refrigeration equipment such as a plurality of refrigerated showcases for storing frozen goods.
JP 2004-144446 A

  However, for example, in winter, when the hot water flowing out of the hot water storage tank of the hot water supply circuit and the refrigerant discharged from the compressor are at low temperatures, the heat between the hot water flowing out of the hot water storage tank and the refrigerant discharged from the compressor is low. Since the exchange rate is low, it takes a long time to raise the temperature of the hot water supply water.

  In addition, in the cooling system installed in the store, exhaust heat is generated from the condenser of the refrigerant circuit, but this heat is released to the outside air without being used at all.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to increase the temperature of hot water supply water in a short time, and for example, a store equipped with a refrigeration equipment such as a refrigerated showcase. It is to provide a hot water supply system that can save energy.

  In order to achieve the above object, a hot water supply system of the present invention comprises a first compressor, a first expansion mechanism, and an air heat exchanger, and includes a first refrigerant circuit that circulates a first refrigerant, a second compressor, A second refrigerant circuit that comprises an evaporator for two expansion mechanisms and other cooling devices, and that comprises a second refrigerant circuit that circulates a second refrigerant, a hot water storage tank and a pump, and a hot water supply circuit that circulates hot water in the hot water storage tank by a pump; A first water heat exchanger for exchanging heat between the first refrigerant discharged from the first compressor and hot water for water flowing through the hot water supply circuit, and hot water for hot water flowing through the second refrigerant discharged from the second compressor and the hot water supply circuit It is the structure provided with the 2nd water heat exchanger which heat-exchanges between.

  According to the hot water supply system of the present invention, heat is exchanged between the first refrigerant discharged from the first compressor and the hot water flowing through the hot water supply circuit in the first water heat exchanger, and the second water heat exchanger is the first in the second water heat exchanger. Heat exchange is performed between the second refrigerant discharged from the two compressors and hot water supply water flowing through the hot water supply circuit. The hot water supply water exchanges heat with the first refrigerant and the second refrigerant, thereby increasing the temperature of the hot water supply water.

  According to the present invention, not only the first refrigerant flowing through the first refrigerant circuit but also the hot water supplying water flowing through the hot water supply circuit is exchanged using the second refrigerant flowing through the second refrigerant circuit. The temperature can be raised in a short time. Further, since the exhaust heat of the second refrigerant circuit provided with the cooling / heating device can be used, the energy consumption rate (hereinafter referred to as COP; COP: Coefficient of Performance) of the entire store including the hot water supply system is improved. Can save energy in stores equipped with

  FIG. 1 shows a schematic configuration diagram of a hot water supply system according to a first embodiment of the present invention.

  This hot water supply system constitutes a first refrigerant circuit 10 through which a first refrigerant flows, a plurality of refrigerated showcases 20 for storing refrigerated goods, a refrigeration cycle of the refrigerated showcase 20, and a second refrigerant through which a second refrigerant flows. A refrigerant circuit 30 and a hot water supply circuit 40 through which hot water supply water flows are configured.

  The first refrigerant circuit 10 includes a first compressor 11, a first water heat exchanger 12, a first expansion valve 13 as an expansion mechanism, and an air heat exchanger 14, and the first compressor 11 → the first water heat exchange. The first refrigerant can be circulated in the order of the vessel 12 → the first expansion valve 13 → the air heat exchanger 14 → the first compressor 11. The air heat exchanger 14 is disposed outside, and an air heat exchanger blower 15 that exchanges heat between the first refrigerant in the air heat exchanger 14 and the outside air is provided. The first refrigerant used in the first refrigerant circuit 10 is a natural refrigerant (for example, carbon dioxide).

  Each refrigerated showcase 20 includes a second expansion valve 21 and an evaporator 22 as an expansion mechanism connected to the second refrigerant circuit 30 inside. The evaporator 22 includes air and an evaporator in each refrigerated showcase 20. An evaporator blower 23 for exchanging heat with the second refrigerant in 22 is provided. Each refrigerated showcase 20 includes a switching valve 24 that switches the flow of the second refrigerant to the second expansion valve 21 and the evaporator 22, and the temperature of each refrigerated showcase 20 is adjusted by switching the switching valve 24. To do.

  The second refrigerant circuit 30 includes a second compressor 31, a second water heat exchanger 32, a switching valve 24, a second expansion valve 21, and an evaporator 22. In the case where the second refrigerant is circulated through the second expansion valve 21 and the evaporator 22, the second refrigerant circuit 30 has the second compressor 31 → the second water heat exchanger 32 → the switching valve 24 → the second expansion valve. The second refrigerant flows in the order of 21 → evaporator 22 → second compressor 31. On the other hand, when the switching valve 24 is switched to adjust the temperature of each refrigerated showcase 20, the second compressor 31 → the second water heat exchanger 32 → the switching valve 24 → the second compressor 31 in this order. The refrigerant is in circulation. The second refrigerant used in the second refrigerant circuit 30 is a chlorofluorocarbon refrigerant (for example, R-134a or R-404a).

  The hot water supply circuit 40 includes a hot water storage tank 41, a pump 42, the first water heat exchanger 12, and the second water heat exchanger 32. That is, the first water heat exchanger 12 is shared by the first refrigerant circuit 10 and the hot water supply circuit 40, and the second water heat exchanger 32 is shared by the second refrigerant circuit 30 and the hot water supply circuit 40. The hot water supply circuit 40 can distribute hot water supply water in the order of the hot water storage tank 41 → the pump 42 → the first water heat exchanger 12 → the second water heat exchanger 32 → the hot water storage tank 41. Furthermore, a hot water tank 43 and a hot water supply device 44 are connected to the hot water storage tank 41. This water supply tank 43 is for supplying hot water supply water to the hot water storage tank 41, and the hot water supply device 44 is for discharging the hot water supply water at a set temperature such as a faucet or shower to the outside.

  Next, the operation of the hot water supply system shown in FIG. 1 will be described.

  The 1st refrigerant | coolant of the 1st refrigerant circuit 10 distribute | circulates in order of the 1st compressor 11-> 1st water heat exchanger 12-> 1st expansion valve 13-> air heat exchanger 14-> 1st compressor 11 (FIG. 1). (See solid arrow).

  The second refrigerant in the second refrigerant circuit 30 flows in the order of the second compressor 31 → the second water heat exchanger 32 → the switching valve 24 → the second expansion valve 21 → the evaporator 22 → the second compressor 31 (FIG. 1 (see dashed arrow 1). The inside of each refrigerated showcase 20 is cooled by the second refrigerant flowing through the second expansion valve 21 and the evaporator 22. On the other hand, when the switching valve 24 is switched, the second refrigerant flows in the order of the second compressor 31 → the second water heat exchanger 32 → the switching valve 24 → the second compressor 31 (see the broken line arrow in FIG. 1). ). By switching the switching valve 24, the second refrigerant flows without exchanging heat in each refrigerated showcase 20, and the temperature of each refrigerated showcase 20 is adjusted.

  Hot water for the hot water supply circuit 40 circulates in the order of the hot water storage tank 41 → the pump 42 → the first water heat exchanger 12 → the second water heat exchanger 32 → the hot water storage tank 41 (see the white arrow in FIG. 1).

  As the first refrigerant, the second refrigerant, and the hot water supply flow through each circuit 10, 30, 40, the first water heat exchanger 12 passes through the first refrigerant discharged from the first compressor 11 and the hot water supply circuit 40. Heat exchange is performed between the hot water supply water and the second water heat exchanger 32 exchanges heat between the second refrigerant discharged from the second compressor 31 and the hot water supply water flowing through the hot water supply circuit 40. When the hot water supply water exchanges heat with the first refrigerant and the second refrigerant, the hot water supply water rises to the set temperature T ° C.

  Thus, according to the hot water supply system of the present embodiment, not only the first refrigerant flowing through the first refrigerant circuit 10 but also the hot water supply flowing through the hot water supply circuit 40 using the second refrigerant flowing through the second refrigerant circuit 30. Since the water is heat exchanged, the temperature of the hot water supply water can be raised in a short time. In addition, since the exhaust heat of the second refrigerant circuit 30 provided with the refrigerated showcase 20 that is a refrigeration device can be used, the COP of the entire store including the hot water supply system is improved, and the store with the refrigerated showcase 20 is improved. Energy saving can be achieved.

  In addition, since the air heat exchanger 14 is disposed outside, heat can be taken into the first refrigerant in the air heat exchanger 14 from the outside air.

  FIG. 2 shows a schematic configuration diagram of a hot water supply system according to a second embodiment of the present invention. In addition, the same component as the hot water supply system shown in FIG.

  The hot water supply system shown in FIG. 2 is different from the hot water supply system shown in FIG. 1 in that a third water heat exchanger 50 in which the first water heat exchanger 12 and the second water heat exchanger 32 are integrally formed is provided. .

  The third water heat exchanger 50 is formed by integrally forming the first water heat exchanger 12 and the second water heat exchanger 32. That is, the third water heat exchanger 50 is shared by the first refrigerant circuit 10, the second refrigerant circuit 30, and the hot water supply circuit 40.

  Next, the operation of the hot water supply system shown in FIG. 2 will be described.

  The first refrigerant in the first refrigerant circuit 10 flows in the order of the first compressor 11 → the third water heat exchanger 50 → the first expansion valve 13 → the air heat exchanger 14 → the first compressor 11 (FIG. 2). (See solid arrow).

  The second refrigerant in the second refrigerant circuit 30 flows in the order of the second compressor 31 → the third water heat exchanger 50 → the switching valve 24 → the second expansion valve 21 → the evaporator 22 → the second compressor 31 (FIG. 2). On the other hand, when the switching valve 24 is switched, the second refrigerant flows in the order of the second compressor 31 → the third water heat exchanger 50 → the switching valve 24 → the second compressor 31 (see the broken line arrow in FIG. 2). ). By switching the switching valve 24, the second refrigerant flows without exchanging heat in each refrigerated showcase 20, and the temperature of each refrigerated showcase 20 is adjusted.

  Hot water for the hot water supply circuit 40 flows in the order of the hot water storage tank 41 → the pump 42 → the third water heat exchanger 50 → the hot water storage tank 41 (see the white arrow in FIG. 2).

  The first refrigerant, the second refrigerant, and the hot water supply water flow through the circuits 10, 30, and 40, so that in the third water heat exchanger 50, the first refrigerant and the hot water supply circuit 40 flow through the first refrigerant circuit 10. Heat exchange is performed between the hot water supply water and heat exchange between the second refrigerant flowing through the second refrigerant circuit 30 and the hot water supply flowing through the hot water supply circuit 40. When the hot water supply water exchanges heat with the first refrigerant and the second refrigerant, the hot water supply water rises to the set temperature T ° C.

  According to the hot water supply system of the present embodiment, since the third water heat exchanger 50 is shared by the first refrigerant circuit 10, the second refrigerant circuit 30, and the hot water supply circuit 40, the entire hot water supply system can be reduced in size. Can do.

  Moreover, since the hot water supplied through the hot water supply circuit 40 exchanges heat with the first refrigerant and the second refrigerant at the same time, the hot water at the set temperature T ° C. can be supplied to the hot water storage tank 41 in a short time. Other operations and effects are the same as those in the first embodiment.

  FIG. 3 shows a schematic configuration diagram of a hot water supply system according to a third embodiment of the present invention. In addition, the same component as the hot water supply system shown in FIG.

  The hot water supply system shown in FIG. 3 differs from the hot water supply system shown in FIG. 1 in that a condenser 51 is provided in the second refrigerant circuit 30.

  The condenser 51 is provided between the second water heat exchanger 32 of the second refrigerant circuit 30 and the switching valve 24 of each refrigerated showcase 20. Further, the condenser 51 is provided with a condenser blower 52 that exchanges heat between the outside air and the second refrigerant in the condenser 51.

  Next, the operation of the hot water supply system shown in FIG. 3 will be described. Note that the flow of the first refrigerant in the first refrigerant circuit 10 and the flow of hot water for the hot water supply circuit 40 are the same as those in the first embodiment, and a description thereof will be omitted.

  The second refrigerant in the second refrigerant circuit 30 is in the order of the second compressor 31 → the second water heat exchanger 32 → the condenser 51 → the switching valve 24 → the second expansion valve 21 → the evaporator 22 → the second compressor 31. It is distributed (see broken line arrow in FIG. 3). The inside of each refrigerated showcase 20 is cooled by the second refrigerant flowing through the second expansion valve 21 and the evaporator 22. On the other hand, when the switching valve 24 is switched, the second refrigerant flows in the order of the second compressor 31 → the second water heat exchanger 32 → the condenser 51 → the switching valve 24 → the second compressor 31 (FIG. 3). (See the dashed arrow). By switching the switching valve 24, the second refrigerant flows without exchanging heat in each refrigerated showcase 20, and the temperature of each refrigerated showcase 20 is adjusted.

  According to the hot water supply system of the present embodiment, since the second refrigerant in the second refrigerant circuit 30 passes through the condenser 51, the second refrigerant having a low temperature can be sent to each refrigerated showcase 20. Thereby, since the 2nd refrigerant | coolant used as low temperature can be distribute | circulated to the 2nd expansion valve 21 and the evaporator 22, the inside of each refrigerated showcase 20 can be cooled in a short time. Other operations and effects are the same as those in the first embodiment.

  In addition, although the said 1st Embodiment thru | or 3rd Embodiment installed the 2nd expansion valve 21 and the evaporator 22 in the inside of the refrigerated showcase 20, it is not restricted to this. For example, the second expansion valve 21 and the evaporator 22 may be installed in a cooling device such as an air conditioner or a refrigerator / refrigerator.

The schematic block diagram of the hot-water supply system which concerns on 1st Embodiment of this invention. The schematic block diagram of the hot water supply system which concerns on 2nd Embodiment of this invention. The schematic block diagram of the hot water supply system which concerns on 3rd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... 1st refrigerant circuit, 11 ... 1st compressor, 12 ... 1st water heat exchanger, 13 ... 1st expansion valve, 14 ... Air heat exchanger, 20 ... Refrigerated showcase, 21 ... 2nd expansion valve, DESCRIPTION OF SYMBOLS 22 ... Evaporator, 30 ... 2nd refrigerant circuit, 31 ... 2nd compressor, 32 ... 2nd water heat exchanger, 40 ... Hot water supply circuit, 41 ... Hot water storage tank, 42 ... Pump.

Claims (4)

A first refrigerant circuit comprising a first compressor, a first expansion mechanism and an air heat exchanger, and circulating a first refrigerant;
A second refrigerant circuit comprising a second compressor, a second expansion mechanism, and an evaporator for other refrigeration equipment, and circulating a second refrigerant;
A hot water supply circuit comprising a hot water storage tank and a pump, and circulating hot water in the hot water storage tank by the pump;
A first water heat exchanger that exchanges heat between the first refrigerant discharged from the first compressor and the hot water supply water flowing through the hot water supply circuit;
A hot water supply system comprising: a second water heat exchanger that exchanges heat between the second refrigerant discharged from the second compressor and hot water for water flowing through the hot water supply circuit. The hot water supply system according to claim 1, wherein the air heat exchanger is arranged outdoors. The hot water supply system according to claim 1 or 2, wherein the first water heat exchanger and the second water heat exchanger are integrally formed. The hot water supply system according to any one of claims 1 to 3, wherein a condenser is provided in the second refrigerant circuit.

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