Hot Water Supply System

Abstract

A hot water supply system includes a first heat pump, a second heat pump, and a hot water storage tank. The first heat pump heats water stored in the hot water storage tank to make hot water. The second heat pump heats water supplied to the hot water storage tank.

1 - 3 . (canceled) 
     
     
         4 . A hot water supply system comprising:
 a first heat pump having a cycle in which a first refrigerant is configured to become higher in temperature and pressure by a first compressor, then is forwarded to a first heat exchanger, and is expanded after becoming a low temperature and high pressure state through the first heat exchanger, the first heat pump being configured to heat water stored in a hot water storage tank to make hot water; and   a second heat pump having a cycle in which a second refrigerant is configured to become high in temperature and pressure by a second compressor, then is forwarded to a second heat exchanger, and is expanded after becoming a low temperature and high pressure state through the second heat exchanger, the second heat pump being configured to heat water supplied to the hot water storage tank.   
     
     
         5 . The hot water supply system according to  claim 4 , further comprising a third heat exchanger configured to exchange heat between the first refrigerant that has been caused to become high in temperature and pressure by the first compressor and is forwarded to the second heat exchanger, and the second refrigerant, wherein the second heat pump is configured to use the third heat exchanger as a heat source. 
     
     
         6 . The hot water supply system according to  claim 4 , wherein the second heat pump is configured to use atmospheric air as a heat source. 
     
     
         7 . A hot water supply system operation method comprising:
 performing, by a first heat pump, a cycle in which a first refrigerant becomes higher in temperature and pressure by a first compressor, then is forwarded to a first heat exchanger, and is expanded after becoming a low temperature and high pressure state through the first heat exchanger, the first heat pump being configured to heat water stored in a hot water storage tank to make hot water; and   performing, by a second heat pump, a cycle in which a second refrigerant becomes high in temperature and pressure by a second compressor, then is forwarded to a second heat exchanger, and is expanded after becoming a low temperature and high pressure state through the second heat exchanger, the second heat pump being configured to heat water supplied to the hot water storage tank.   
     
     
         8 . The hot water supply system operation method according to  claim 7 , further comprising exchanging, by a third heat exchanger, heat between the first refrigerant that has been caused to become high in temperature and pressure by the first compressor and is forwarded to the second heat exchanger, and the second refrigerant, wherein the second heat pump uses the third heat exchanger as a heat source. 
     
     
         9 . The hot water supply system operation method according to  claim 7 , wherein the second heat pump uses atmospheric air as a heat source. 
     
     
         10 . A hot water supply system comprising:
 a first heat pump configured to heat water stored in a hot water storage tank, the first heat pump being further configured to perform a first cycle comprising:
 causing a first refrigerant to become higher in temperature and pressure by a first compressor; 
 after causing the first refrigerant to become higher in temperature and pressure, forwarding the first refrigerant to a first heat exchanger; 
 expanding, the first refrigerant, after causing the first refrigerant to become lower in temperature while in a high pressure state by the first heat exchanger; 
   a second heat pump configured to heat water supplied to the hot water storage tank, the second heat pump being further configured to perform a second cycle comprising:
 causing a second refrigerant to become higher in temperature and pressure by a second compressor; 
 after causing the second refrigerant to become higher in temperature and pressure, forwarding the second refrigerant to a second heat exchanger; 
 expanding, the second refrigerant, after causing the second refrigerant to become lower in temperature while in a high pressure state by the second heat exchanger; and 
   a third heat exchanger configured to exchange heat between the first refrigerant and the second refrigerant.   
     
     
         11 . The hot water supply system according to  claim 10 , wherein the third heat exchanger is configured to exchange heat between the first refrigerant and the second refrigerant after the first refrigerant has been caused to become high in temperature and pressure. 
     
     
         12 . The hot water supply system according to  claim 10 , wherein the third heat exchanger is configured to exchange heat between the first refrigerant and the second refrigerant after the first refrigerant has been caused to become high in temperature and pressure by forwarding the first refrigerant to the second heat exchanger. 
     
     
         13 . The hot water supply system according to  claim 10 , wherein the second heat pump is configured to use the third heat exchanger as a heat source. 
     
     
         14 . The hot water supply system according to  claim 10 , wherein the second heat pump is configured to use atmospheric air as a heat source.