PURPOSE: To prevent the over-boiling of a heat medium in case of discharge, and to operate the collector stably by circulating and discharging the heat medium and supplying a liquid by means of a pump for circulating the heat medium of a heat collecting circuit.
CONSTITUTION: The circulating pump 5 is installed to a heat collecting circulating circuit formed by connecting a heat collector 1 and a heat exchanger 2 by pipings 3, 4, three-way valves 6, 7 are each mounted at the inflow side and outflow side of the circulating pump 5, a draining line 10 with a valve 8 is branched from a section between the circulating pump 5 and the three-way valve 7 and faced to a liquid receiving tank 9, a liquid supply line 11 connected to the liquid receiving tank 9 is connected to the three-way valve 6, and the upper flow of the three-way valve 6 and the three-way valve 7 are communicated by a connecting line 12 at the inflow side of the pump. According to such constitution, the heat medium is circulated and discharged and the liquid is supplied by means of the circulating pump 5.
NINAGAWA NORIO
SUGA KUNIHIRO
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