Refrigeration – Air compressor – cooler and expander type – Motor-type expander
Patent
1975-03-17
1976-07-06
King, Lloyd L.
Refrigeration
Air compressor, cooler and expander type
Motor-type expander
62 87, 62 91, 62121, 62304, F25D 900
Patent
active
039674665
ABSTRACT:
An air conditioning unit having a driven rotor with a plurality of vanes and including a compressor portion and an expander portion, each having inlet and outlet ports, with a heat exchanger connected between the compressor outlet port and the expander inlet port. A non-condensing gas such as air is fed into the compressor inlet port, compressed, accompanied by a rise in temperature, cooled by the heat exchanger, and expanded back to substantially its initial pressure for discharge in the cold state at the expander outlet port, a non-condensing gas being defined as any gas which does not condense at the pressures and temperatures encountered in the unit. In accordance with the main feature of the present invention, means are provided for spraying into the non-condensing gas at the compressor inlet port an excess of finely divided droplets of a condensible additive fluid, having a high heat of vaporization, to super-saturate the gas, the droplets evaporating due to the temperature achieved in compression thereby absorbing heat of vaporization. This results in a reduction in temperature of the gas at the compressor outlet port thereby reducing the work required to compress the gas and consequently the work required to drive the rotor. As the compressed gas is cooled in the heat exchanger, the excess additive fluid condenses, is collected in a sump, and recirculated back to the compressor inlet port. The gas leaving the heat exchanger, still saturated with fluid, is cooled in the expander resulting in further condensation in the expander releasing heat of vaporization and increasing the work of expansion further reducing the network required to drive the rotor. In one embodiment of the invention the system is open and air is used as gas, with water as the additive. In such embodiment the cold air is discharged into the cooled space via an outlet assembly which serves as a second heat exchanger. In a second embodiment a second heat exchanger provides a closed connection between the expander outlet port and the condenser inlet port to form a loop sealed against escape of gas. When the system is closed, the gas and additive fluid may take forms other than water and may include a lubricant for the vanes of the rotor.
REFERENCES:
patent: 2175163 (1939-10-01), Waterfill
patent: 2197492 (1940-04-01), Dodge
patent: 2304151 (1942-12-01), Crawford
patent: 2585570 (1952-02-01), Messinger et al.
patent: 2704925 (1955-03-01), Wood
patent: 2834188 (1958-05-01), Bradford
patent: 3686893 (1972-08-01), Edwards
King Lloyd L.
The Rovac Corporation
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