To realize a rapid start-up at the time of starting up during a heating, and to timely supply moisture as a heat storage agent by utilizing a nigh power.
A compressor 1 is driven by a night power, high temperature high pressure refrigerant gas is caused to flow in an indoor heat-exchanger submerged part 5b submerged in the heat storage agent of a heat storage tank 8, and heat is stored in the heat storage agent through heat-exchange. At the time of starting up heating, a suction blower 11 on the indoor side is driven, indoor air is supplied in the heat storage agent in the heat storage tank 8 through a suction pipe 9 on the indoor side and brought into direct contact and heat-exchange and increased in temperature, and supplied in a room. By this constitution a momentary rapid start-up is realized. Meanwhile, a suction blower 14 on the outdoor side is timely driven, outdoor air is supplied in a cold storage agent in a cold storage tank 7 through a suction pipe 12 on the outdoor side, and moisture is taken in the cold storage agent. The moisture is supplied in the heat storage tank 8 from the cold storage tank 7 through a water quantity regulation valve 15.
MASUDA MASAAKI
CHO TSUNEYOSHI
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