| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To achieve refrigerant cooling in a motor without decreasing thermal efficiency and increasing cost even when the temperature of a heat source medium becomes comparatively high. <P>SOLUTION: A steam compression type heat pump 1 is driven by a motor 17 and includes a compressor 3 that compresses a refrigerant, a warm heat generating heat exchanger 6 that heats hot water by a compressed refrigerant, an expansion valve 9 that expands the refrigerant introduced from the warm heat generating heat exchanger 6, an evaporator 5 that evaporates the refrigerant introduced from the expansion valve 9 through heat exchange with heat source water, a cooling refrigerant introduction route 20 that is branched from between the warm heat generating heat exchanger 6 and expansion valve 9 and introduces part of the refrigerant to the motor 17 to cool the motor 17, and a cooling refrigerant return route 30 that introduces the refrigerant after cooling the motor 17 to the upstream side of the evaporator 5. The cooling refrigerant introduction route 20 includes a heat recovering heat exchanger 22 that exchanges heat with the refrigerant in the cooling refrigerant return route 30 and a cooling refrigerant heat exchanger 24 that exchanges heat with an external cold heat source 26. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
