Drain down freeze prevention control system for a solar collecto

Details Drain down freeze prevention control system for a solar collecto Drain down freeze prevention control system for a solar collecto

1978-02-06

1981-03-17

Scott, Samuel

Stoves and furnaces

Tool having fluid fuel burner

Curling iron

126422, F24J 302

Patent

active

042560896

ABSTRACT:
A control device for preventing freeze damage to a solar hot water heater collector and auxiliary conduits, while insuring system operation for absorbing energy whenever sufficient useable solar energy is available, thereby increasing the overall efficiency of the system. The control device includes a drain valve that may be opened as a function of ambient temperature and a drain down override circuit that insures closure of the drain down system whenever a predetermined temperature differential exists between the water in the collector and the heated water in the storage tank. The drain down will be thereby overridden in favor of increasing system energy at a predetermined temperature differential.

REFERENCES:
patent: 3346191 (1977-12-01), Hapgood
patent: 3799145 (1974-03-01), Butterfield
patent: 4027821 (1977-06-01), Hayes
patent: 4052000 (1977-10-01), Honikman
patent: 4063545 (1967-10-01), Roach
patent: 4064868 (1977-12-01), Nussbaum
patent: 4129118 (1978-12-01), Banke
patent: 4133338 (1979-01-01), Honikman

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