Heat pump hydronic heater

Abstract

The heat pump hydronic heater of the invention includes a heat pump circuit and a hot water tank circuit, the heat pump circuit and the hot water tank circuit are accommodated in one casing 50 , and a hermetic expansion tank 37 is connected to a hot water tank 7 and the heat pump hydronic heater can absorb expansion of water in a circulation path when hot water in a hot water tank 7 is circulated through heat a floor or supply hot water.

1 . A heat pump hydronic heater comprising a heat pump circuit and a hot water tank circuit, in which
 the heat pump circuit includes a compressor which compresses a refrigerant and discharges a high temperature refrigerant, a water/refrigerant heat exchanger which exchanges heat between water and a high temperature refrigerant to produce hot water, a decompressor which decompresses a refrigerant, and an evaporator which exchanges heat between air and a refrigerant,   the hot water tank circuit includes a boiling circuit and a heating circuit,   in the boiling circuit, hot/cold water in the hot water tank is heated by the water/refrigerant heat exchanger,   in the heating circuit, the hot water produced by the water/refrigerant heat exchanger is introduced directly into a heating terminal or introduced to the heating terminal through the hot water tank, and the hot water is made to dissipate heat by the heating terminal, and   the heat pump circuit and the hot water tank circuit are accommodated in one casing, wherein   a hermetic expansion tank is connected to the hot water tank.   
     
     
         2 . The heat pump hydronic heater according to  claim 1 , wherein
 a longitudinally long cylindrical tank is used as the hot water tank,   the evaporator is provided with a blast fan to send air,   the hot water tank is disposed in one of spaces in the casing in its width direction,   the evaporator and the blast fan are disposed in the other space in the casing in the width direction, and   the expansion tank is disposed at a location higher than the hot water tank.   
     
     
         3 . The heat pump hydronic heater according to  claim 2 , wherein
 the expansion tank is disposed in a space above the hot water tank, and the expansion tank is covered with a heat insulator.   
     
     
         4 . The heat pump hydronic heater according to  claim 1  wherein
 the hot water tank circuit includes a hot water supply circuit, 
 in the boiling circuit, a boiling pump is driven, thereby introducing water in the hot water tank to the water/refrigerant heat exchanger, and hot water produced by the water/refrigerant heat exchanger is returned to the hot water tank, 
 in the hot water supply circuit, a hot water supply pump is driven, thereby introducing hot water in the hot water tank to a hot water supply heat exchanger, and the hot water which exchanged heat with respect to hot water-to-be-supplied flowing through a hot water supply pipe by the hot water supply heat exchanger is returned to the hot water tank, 
 in the heating circuit, a heat pump is driven, thereby introducing the hot water in the hot water tank to the heating terminal, and the hot water which dissipated heat at the heating terminal is returned to the hot water tank, 
 the casing includes an intake connection port through which the hot water-to-be-supplied is supplied to the hot water supply heat exchanger, 
 a take-out connection port through which the hot water-to-be-supplied heated by a hot water supply heat exchanger is introduced to the hot water supply terminal, 
 a hot water outflow port through which the hot water is supplied to the heating terminal, and 
 a hot water inflow port through which the hot water from the heating terminal is returned to the hot water tank, 
 the evaporator is disposed such that it is opposed to a back surface and the other side surface of the casing, 
 one of front surface of the casing in the width direction is closed, 
 the other front surface of the casing in the width direction is formed as an air outlet for the blast fan, and 
 the intake connection port, the take-out connection port, the hot water outflow port and the hot water inflow port are disposed in lower portions of the back surface of the casing. 
 
     
     
         5 . The heat pump hydronic heater according to  claim 4 , wherein
 the hot water tank includes a partition plate which partitions an interior of the hot water tank into an upper space and a lower space,   an upper heater disposed in the upper space, and   a lower heater disposed in the lower space,   in the boiling circuit, the hot water produced by the water/refrigerant heat exchanger is returned to the lower space,   in the hot water supply circuit, the hot water in the upper space is introduced to the hot water supply heat exchanger, and   in the heating circuit, the hot water in the lower space is introduced to the heating terminal.   
     
     
         6 . The heat pump hydronic heater according to  claim 1 , wherein R407C is used as the refrigerant. 
     
     
         7 . The heat pump hydronic heater according to  claim 1 , wherein the back surface of the casing is opposed to a wall surface of a building, and the casing is disposed out of doors.