Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation
Patent
1983-08-12
1986-11-25
Husar, Stephen F.
Power plants
Motive fluid energized by externally applied heat
Process of power production or system operation
60655, 62 8, F01K 1700
Patent
active
046241094
ABSTRACT:
A thermodynamic method and engine is provided for extracting natural thermal energy from ambient atmospheric air and converting it into mechanical work. The extraction process is accomplished by isentropically expanding ordinary air at atmospheric pressure into a thermally insulated vacuum chamber maintained at low pressure. By employing sufficiently high expansion ratios, a large portion of the air can be made to undergo a spontaneous phase transformation into the solid state at cryogenic temperature. This results in a substantial reduction of the specific volume of the condensed air which enables the vacuum environment of the chamber to be maintained by expending less mechanical work than that gained from the initial expansion. Thus, the net amount of mechanical work generated therefrom is positive. Substantial additional mechanical work is generated by harnessing the thermal potential difference between the low temperature condensed air and the ambient environment via additional cryogenic engine stages.
REFERENCES:
patent: 3451342 (1969-06-01), Schwartzman
patent: 4285203 (1981-08-01), Vakil
patent: 4326382 (1982-04-01), Baardson
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