Universal differential thermostat for solar heating system

Details Universal differential thermostat for solar heating system Universal differential thermostat for solar heating system

1976-11-11

1978-11-14

O'Dea, William F.

Stoves and furnaces

Ovens

Domestic

126400, 237 1A, 165 18, F24J 302

Patent

active

041251075

ABSTRACT:
A thermostat or controller for controlling water circulation in a solar heating system is disclosed as including a resistant bridge circuit with a solar panel temperature responsive resistance and a storage tank temperature responsive resistance in opposite arms joined at one power input node with a differential comparator connected across the sensing nodes of the bridge. There are also disclosed optional features including additional fixed resistance divider circuits together with respective additional comparators sensing low-limit solar panel temperatures and/or high-limit storage tank temperatures for turning on or off the circulation pump, and/or for running cool water into the storage tank. In still another disclosed feature a sun switch produces periodic operation of the circulation pump to cause a sensor in the outlet of the solar panel to produce a true reading of solar panel temperature.

REFERENCES:
patent: 3388860 (1968-01-01), Kruper
patent: 3931806 (1976-01-01), Hayes
patent: 3986489 (1976-10-01), Schlesinger
patent: 3988207 (1976-12-01), Watt

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