Low temperature engine

Details Low temperature engine Low temperature engine

1976-04-07

1977-08-16

Ostrager, Allen M.

Power plants

Motor having a buoyant working member

Working member actuated by the rise and fall of a surface of...

60641, F03G 704

Patent

active

040417050

ABSTRACT:
The invention describes a new type of engine particularly adapted for the conversion of solar thermal energy at low temperature to mechanical and electrical energy. A relatively cold and a relatively warm chambers are sealed from the outside environment and contain a low boiling point evaporating fluid. A tube dips at its lower open end in the fluid phase of the warm chamber. The upper open end of the tube is branched and opens into the vapor phases of the cold and warm chambers. The level of the fluid in the lower end of the tube rises and falls in response to alternate opening and closing of the communications of the tube with the vapor phases of the warm and cold chambers. The movement of fluid is translated to useful work through a float responding to the fluid levels. A high density fluid may be used in the warm chamber to increase the buoyant force acting upon the float. One modification of the engine functions as a highly efficient fuel-operated steam engine.

REFERENCES:
patent: 3846984 (1974-11-01), Siegel

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