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A passive thermosiphon loop of circulating heat transport liquid transfers heat from an inclined absorber to a heat exchanger in thermal contact with a second fluid. Reverse thermosiphoning under normal conditions is prevented by a ball type check valve. Due to differences in the thermal expansion b

A passive thermosiphon loop of circulating heat transport liquid transfers heat from an inclined absorber to a heat exchanger in thermal contact with a second fluid. Reverse thermosiphoning under normal conditions is prevented by a ball type check valve. Due to differences in the thermal expansion between the valve ball and the transport liquid, the valve will, however, permit reverse thermosiphoning at high temperatures.

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A solar energy system for heating fluids, which comprises: an absorber inclined to the horizontal, having flow passages therethrough for the thermosiphoning circulation of heat transport liquid; a conduit loop for the removal of hot transport liquid from the top of the absorber and the return of coo

A solar energy system for heating fluids, which comprises: an absorber inclined to the horizontal, having flow passages therethrough for the thermosiphoning circulation of heat transport liquid; a conduit loop for the removal of hot transport liquid from the top of the absorber and the return of cool transport liquid to the bottom of the absorber; a valve disposed in said conduit loop having a housing with a lower inlet port for the introduction of transport liquid passing to the valve from said absorber and an upper outlet port for the transport liquid effluent passing through said valve; a valve seat interposed in said housing between said ports; a valve member movably disposed in said housing above the valve seat, which has a density greater than the heat transport liquid at or below a specified normal operating temperature, and a density less than the heat transport liquid above the specified normal operating temperature, which valve member will sealingly engage the valve seat to prevent the downward flow of heat transport liquid if the operating temperature is at or below the specified normal operating temperature, but which will disengage from the valve seat to permit the upward flow of fluid, and which will also disengage from the valve seat to permit the downward flow of fluid if the operating temperature is above the specified normal operating temperature; and means for exchanging thermal energy from the hot transport liquid in the conduit loop, between said valve and the return inlet of the conduit to the absorber, to a cooler fluid.