PURPOSE: To provide a low temperature latent heat accumulation system which can be applied to a facility of cold heat source for a cryogenic industry.
CONSTITUTION: Cold heat generated by a brine chilling device 1 (a brine temperature is about -15°C) is fed to a heat exchanger 4-1 within a heat accumulation tank 2 through a brine circuit 5-1. An inner side of the heat accumulation tank 2 is filled with heat accumulative material (water solution of ammonium sulfate) obtained by refining heavy oil ash of a fire plant, heat accumulative material 3 heat exchanged with the brine in the brine circuit 5-1 is condensed or solidified at about -15°C so as to complete heat accumulating operation. In turn, cold heat accumulated in the heat accumulative tank 2 at night in this way is thermally radiated at daytime, only a thermal radiating operation is carried out from the heat accumulation tank 2. That is, the heat accumulating material (ammonium sulfate) condensed or solidified at night is gradually melted, brine in the brine circuit 5-2 is cooled under utilization of its melting heat (melting point is about -15°C) and then cold heat is sent to a demand location.
HIDA YOSHINORI
TANII TADAAKI
MITSUBISHI HEAVY IND LTD