FREEZE PROTECTION SYSTEM FOR SOLAR HEATING COLLECTOR

摘要

The invention relates to a method and system for the prevention of freezing in a solar collector arranged to heat a working fluid flowing therethrough in the system, where solar heat is collected by collector panels which transfers heated fluid to a heat exchanger or transfers heated water directly to the top of a hot water storage tank, the collector panels being connected to receive at their lower end cool water from the bottom of the tank, the improvement being the provision of an apparatus Including a temperature sensing device in thermal contact with the lower inlet of the collector panels, and a first heating device being operated by a switching device The control unit receiving temperature readings from the temperature sensor, and compares the temperature to preset values at which the temperature danger of freezing exists and the temperature at which there is no danger of freezing