Importance

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Abstract

A process for preventing freezing of solar collectors by automatic drainage of the water or liquid working fluid contained within the collectors the working fluid is drained from the collector, but remains within the closed solar collector circuit. Apparatus responsive to the pressure exerted on the collector circuit fluid by an external source of pressurized fluid acts to drain and refill the collectors. The pressure is transmitted through a moving transmissio means, which may be a deformable or movable wall, and which prevents transfer of the collector circuit fluid into the external source of pressurized fluid. The apparatus provides two storage tanks, one of which is provided with an auxiliary heater, the thermal yield being substantially improved by arranging one of the two tanks inside the other.

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First Claim