HEAT ACCUMULATING TYPE AIR CONDITIONER

PURPOSE:To reduce an electrical power utilizing time at daytime by a method wherein cold heat accumulated in a heat accumulating medium is utilized under an operation of an accumulated heat circuit, refrigerant condensed and liquified by a heat exchanger for heat accumulation is supplied to an indoor heat exchanger under an operation of cold heat releasing circuit and an amount of heat accumulated within the heat accumulated medium is utilized at a mid-night electrical power time range. CONSTITUTION:During a cold heat accumulating operation at night time, valves 7 and 20 are closed, valves 8 and 14 are opened and a compressor 1 is operated. At this time, refrigerant is adiabatically expanded with a first throttling device 6, evaporated by a heat accumulating heat exchanger 10, heat is removed from heat accumulated medium and then the surface of the heat exchanger 10 for the heat accumulation. At day time, in the case that a cooling operation is carried out only with the compressor 1, valves 7 and 20 are opened, and the valves 8 and 14 are closed. Refrigerant of high pressure condensed and liquified is set to a middle pressure with the first adjusting device 6, thereafter the refrigerant is sent to each of the refrigerant circuit systems (a), (b) and (c) for the indoor device, its pressure is reduced with the second throttling devices 15 (15a to 15c), flowed into an indoor heat exchanger 16 (16a to 16c) and evaporates there and then heat is absorbed from the surrounding interior air. With such an arrangement, it is possible to perform a more efficient cooling operation with a less-expensive mid-night electrical power.