Isothermal open cycle thermodynamic engine and method

Details Isothermal open cycle thermodynamic engine and method Isothermal open cycle thermodynamic engine and method

1975-09-26

1977-05-17

Schwadron, Martin P.

Power plants

Motive fluid energized by externally applied heat

Power system involving change of state

60509, F01K 2500

Patent

active

040233669

ABSTRACT:
A pollution-free thermodynamic engine system and method for converting thermal potential energy to useful mechanical energy employing an isothermal or quasi-isothermal primary working fluid thermodynamic expansion cycle. A relatively cold primary working fluid is conducted from a low temperature storage tank, through a plurality of engine stages each comprising a heat exchanger and an expansion engine operated on an isothermal of quasi-isothermal expansion cycle, and finally exhausted. A relatively warm secondary fluid is circulated through the engine stages to provide a heat input thereto. The engine stages are connected to the primary working fluid path in parallel to operate on a first isothermal expansion cycle; the engine stages are cascaded to operate on a second serial isothermal expansion cycle. A plurality of preliminary heat exchangers in the primary fluid loop enable operation of the engine system on an alternate quasi-isothermal cycle in which the primary working fluid is cycled a plurality of times in a closed loop to improve the energy conversion efficiency of the system.

REFERENCES:
patent: 2514875 (1950-07-01), Kollsman
patent: 3228196 (1966-01-01), Paulsen
patent: 3698184 (1972-10-01), Barrett
patent: 3867816 (1975-02-01), Barrett
patent: 3928974 (1975-12-01), Benson

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