Heat storing apparatus having cascade cycle and control process of the same

摘要

There is provided a heat storing apparatus having a cascade cycle includes a low-temperature cooling cycle and a high-temperature cooling cycle and include a heat storage tank connected with a heat storage heat exchanger of the high-temperature cooling cycle through a heat medium path and a bypass mechanism installed to bypass some of refrigerants compressed in a high-pressure compressor of the high-temperature cooling cycle to a cascade heat exchanger. Some of the refrigerants compressed in the high-pressure compressor are bypassed to the cascade heat exchanger to assist defrosting of an outdoor heat exchanger and the rest of the refrigerants compressed in the high-pressure compressor can heat a heat medium in the heat storage heat exchanger, the temperature of the heat storage tank can be prevented from decreasing during a defrost operation and the outdoor heat exchange can be efficiently defrosted.