| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve degradation of efficiency accompanying the lowering of a temperature in an evaporator, in a heat pump type hot water supply device. <P>SOLUTION: A refrigerant from a refrigerant-water heat exchanger 12 is divided into two flows, the first refrigerant flow is allowed to flow to a first flow channel 15A of an intermediate heat exchanger 15 through an expansion valve 14 (auxiliary throttle means), the second refrigerant is flowed to a second flow channel 15B of the intermediate heat exchanger 15, and then is flowed to the evaporator 18 through an expansion valve 16 (main throttle means), the first refrigerant flow and the second refrigerant flow exchange heat in the intermediate heat exchanger 15, the refrigerant from the evaporator 18 is sucked to a low pressure portion of the compressor 11, and the first refrigerant flow from the intermediate heat exchanger 15 is sucked to an intermediate pressure portion of the compressor 11. The first refrigerant is flowed when an evaporation temperature of the refrigerant is lowered than a prescribed lower limit value T1, and the first refrigerant is not flowed when the evaporation temperature of the refrigerant is the lower limit value T1 or more. <P>COPYRIGHT: (C)2009,JPO&INPIT |
