JPS6414552A - Latent heat type thermal accumulative hot water supplying device utilizing mid-night power - Google Patents

Abstract

PURPOSE:To utilize a mid-night power and provide an effective utilization of latent heat generated by a variation in phase of thermal accumulation material by a method wherein a plurality of thermal accumulation material filling chambers are provided, and thermal accumulation materials having as a substance a different melting point are filled in each of the room for respective physical properties. CONSTITUTION:A structure of a thermal accumulation tank is composed of thermal accumulation material filling chambers 25-27 divided into three sections in a gravity direction, thermal accumulation materials 19-21, a heat exchanging part composed of heat exchangers 7-9 and an electric heater 4 for heating tap water 5. A melting point is gradually higher toward an upper part of the thermal accumulation tank and a difference in temperature of melting point of each of thermal accumulation materials is about 10 deg.C so that a relation of the melting point of each of the thermal accumulation materials satisfies the relation 19>20>21. When the thermal accumulation materials within the thermal accumulation tank is to be melted, the materials are heated by the electric heater until a water temperature in a temperature sensor 11 reaches about 90 deg.C in such a way as all the thermal accumulative materials are melted and then the materials are melted in sequence from the upper part to the lower part under a natural convection effect. The electric heater is utilized from 0 o'clock at mid-night to 8 o'clock in the evening and a time band in which the latent heat generated simultaneously with a heat energy of the melted thermal accumulation material is utilized ranges from 8 o'clock in the morning to 0 o'clock at mid-night.