Freeze protection for solar heating systems

Stoves and furnaces – Heaters – Surface

Patent

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Details

237 1A, 137 62, F24J 302

Patent

active

041333381

ABSTRACT:
Redundant freeze protection having primary and secondary protection modes is provided for a solar heating system, such as a solar water heating system, of the kind whose normal operation involves circulation of a heat transport liquid through a solar collector and a solar energy storage tank to store solar thermal energy in the tank. The primary protection mode is triggered in response to the collector liquid temperature, T.sub.c, dropping to a selected freeze protection trigger level, T.sub.f, and involves termination of liquid circulation through and draining of liquid from the collector. The secondary or back up freeze protection mode occurs upon failure of the collector drainage means to drain the collector in the primary mode in response to the freeze protection trigger condition T.sub.c .ltoreq. T.sub.f and involves continued circulation of liquid through the collector and solar energy storage tank to warm the collector.

REFERENCES:
patent: 2469496 (1949-05-01), Christenson
patent: 3970069 (1976-07-01), Pickett
patent: 3986489 (1976-10-01), Schlesinger
patent: 3989032 (1976-11-01), Harrison
patent: 4019495 (1977-04-01), Frazier et al.
patent: 4027821 (1977-06-01), Hayes et al.
patent: 4044754 (1977-08-01), Cronin et al.

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