Power plants – Motive fluid energized by externally applied heat – Power system involving change of state
Patent
1975-09-23
1978-04-25
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Power system involving change of state
F01K 2104
Patent
active
040855910
ABSTRACT:
A continuous flow, evaporative-type thermal energy recovery apparatus comprises an evaporator unit to which are supplied continuous pressurized flows of hot water and air, and in which a portion of the hot water is evaporated into the air, preferably to completely saturate the air with moisture. Connected to receive the resulting flow of pressurized, water saturated air from the evaporator unit is a low pressure gas turbine, which is operated by such flow. Work is performed by expansion of the saturated air in the turbine, the work being converted, for example, to electricity by a generator connected in driven relationship with the turbine. The source of hot water may be a cooling system for cooling other apparatus or may, for instance, be a heat exchanger in which solar energy is used to heat water recirculated through the apparatus. Condensed water vapor from the turbine may also be recirculated. Water and air are supplied to the evaporator unit by pumps at a pressure substantially equal to the pressure of the saturated air in the unit, such pressure varying according to the equilibrium temperature thereof. The temperature of the water is maintained below the boiling point to avoid production of steam and to enable use of comparatively inexpensive system components having low temperature and pressure capabilities. A corresponding method of thermal energy recovery is thereby provided.
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Bissell Henry M.
Ostrager Allen M.
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