Stoves and furnaces – Heaters – Surface
Patent
1976-03-04
1979-01-16
O'Dea, William F.
Stoves and furnaces
Heaters
Surface
237 1A, F24J 302
Patent
active
041343905
ABSTRACT:
A solar heating system comprises a solar panel having a liquid inlet and vapor outlet, a conduit connecting the inlet and outlet and having a fluid pump therealong operable to circulate fluid through the solar panel and conduit, and a vacuum pump operable to maintain the pressure within the solar panel below a predetermined value. A condenser containing heat exchange fluid is in heat exchange contact with the conduit intermediate the vapor outlet and fluid pump, preferably by passing a portion of the conduit through the condenser. The lower portion of a liquid storage tank is connected to the solar panel and houses fluid drained therefrom when the system is not operating, the vacuum pump communicating with the upper portion of the tank to facilitate draining the panel. Control means automatically activates the vacuum pump to evacuate the solar panel, initiates operation of the solar heating system if the solar panel temperature exceeds a preset value and pressure is below a preset value, and terminates operation of the system if the solar panel temperature falls below the preset value whereupon the vacuum pump operates for a predetermined time period to facilitate draining the solar panel. The system also terminates operation if the panel pressure exceeds the preset value, whereupon the vacuum pump operates to reduce the pressure within the solar panel.
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patent: 2358476 (1944-09-01), Routh et al.
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patent: 3250269 (1966-05-01), Sherock
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patent: 3599626 (1971-08-01), Bouse
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patent: 3929121 (1975-12-01), Rogers
patent: 3974822 (1976-08-01), Patil
Jones Larry
O'Dea William F.
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