PURPOSE: To collect solar heat more effectively by controlling the quantity of hot water being circulated based on the temperature of hot water at the inlet of a heat collector or that of a regenerating tank of a solar heat collector, a regenerating tank, a hot water circulating pump and the like.
CONSTITUTION: When the temperature of hot water at the outlet of a heat collector is higher than that of the heat regenerative tank 2, a normally closed contact of a thermostat 15 is turned ON, and a hot water circulating pump 3a is actuated. When the temperature of the heat regenerative tank is higher than the reference temperature, the normally closed contact of a thermostat 18 is turned ON, both hot water circulating pumps 3a and 3b are actuated. When the temperature of the heat regenerative tank is lower than the reference temperature, the normally closed contact of the thermostat 18 is turned OFF, and the pump 3a is actuated but the pump 3b is not actuated. Conversely, when the temperature of hot water at the outlet of the heat collector is lower than the temperature of the heat regenerative tank, the normally closed contact of a thermostat 15 is turned OFF, and both hot water circulating pumps 3a and 3b and not actuated. Further, when the temperature of the heat regenerative tank is higher than the set operational temperature of a steam generator 6, the normally closed contact of a thermostat 19 is turned ON, and the hot water circulating pump 3c is actuated and heat supply from th heat regenerative tank 2 to a Rankine cycle 4 is carried out. When the temperature of the heat regenerative tank 2 is lower than the set operational temperature of the steam generator 6, the normally closed contact of the thermostat 19 is turned OFF, and the pump 3c is not actuated and heat supply to the Rankine cycle 4 is not performed.
TANAKA HIDEKI
SATOU EIJI
