| 摘要 |
PURPOSE: A heating-cooling heat pump using a binary refrigerant cycle and single-stage refrigerant cycles is provided to smoothly produce hot water by using a cascade heat exchanger in wintertime and to cool in multistage by separately operating single-stage cycles of high and low temperature sides in summertime. CONSTITUTION: A heating-cooling heat pump using a binary refrigerant cycle and single-stage refrigerant cycles includes a low temperature side cooling cycle, a high temperature side cooling cycle, a cascade heat exchanger (16), and a heat storage tank unit (45). The cascade heat exchanger functions as an evaporator of the low temperature side cooling cycle and a condenser of the high temperature side cooling cycle. The heat storage tank unit stores hot water or cold water produced by the cooling cycle of the low or high temperature side cooling cycle. In the heating operation, the heat pump produces hot water with the binary refrigerant cycle exchanging heat between the high temperature side cooling cycle and the low temperature side cooling cycle exchange heat in the cascade heat exchanger. In the cooling operation, the heat pump produces cold water with separate single-stage refrigerant cycles in multistage without heat exchange between the low and high temperature side cooling cycles. |
