Refrigeration – Air compressor – cooler and expander type – Motor-type expander
Patent
1987-01-29
1988-09-20
Bennet, Henry A.
Refrigeration
Air compressor, cooler and expander type
Motor-type expander
60682, F25D 900
Patent
active
047716126
ABSTRACT:
This publication describes a method and apparatus for the utilization of heat energy released in a cooling process. In accordance with the method, air used as the heat transfer medium is routed to a compressor (2) in which compressor (2) the air is compressed to a higher pressure, the compressed air is cooled to a lower temperature, the cooled air is routed to a turbine (8), where it expands to a lower pressure and cools down, and air expansion work released in the turbine (8) is used for rotating the compressor (2). In accordance with the invention, air is compressed in the compressor (2) to such a high pressure that its temperature exceeds a minimum temperature of water boiling point in normal atmospheric pressure, the high-pressure compressed air is cooled to a sufficiently low temperature, e.g., below 15.degree. C., by means of at least one heat exchanger (4, 6) in order to prevent freezing in the turbine (8); the heated medium from the secondary circuit of the heat exchanger (4, 6) is utilized as such, e.g. as hot water, and air is routed from the turbine (8) as such, to the object to be cooled. The method allows the use of the heating medium as such for cooling purposes.
REFERENCES:
patent: 3355905 (1967-12-01), Berhold et al.
patent: 4480444 (1984-11-01), Conan
Bennet Henry A.
Imatran Voima Oy
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