To utilize cold heat stored in a heat storage tank in the night time by means of an air conditioner fully in spring or autumn season of low cooling load.
Summer season of heavy cooling load is discriminated from other intermediate seasons by comparing an moving average operated from outdoor air temperatures detected by a temperature sensor 8 with a constant temperature. In the intermediate seasons, cooling operation utilizing cold heat where high temperature high pressure refrigerant is passed from a compressor 1 to a heat storage tank 31 is performed except heat storage time band in the night time for air conditioners and during 24 hours for showcases. Stored cold heat can be utilized more effectively than a conventional apparatus where operation utilizing cold heat is limited only to peak load time band during intermediate seasons similarly to summer season.
NAKAYAMA SHINICHI
TSUCHIYA TOSHIAKI
ISHIYAMA OSAMU
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