Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1978-04-28
1980-06-03
King, Lloyd L.
Refrigeration
Processes
Compressing, condensing and evaporating
62114, 62238, 62467R, 62498, F25B 100, F25B 2702
Patent
active
042055326
ABSTRACT:
A known type of heat pump or refrigeration apparatus comprises a closed circuit containing a refrigerant, the closed circuit comprising an acceptor for heat exchange between the refrigerant and a first body of a fluid or other substance, a compressor for compressing the refrigerant from the acceptor, a rejector for heat exchange between the compressed refrigerant and a second body of a fluid or other substance, and an expansion device to expand the refrigerant from the rejector before it is directed back to the acceptor. In the known apparatus, the refrigerant is at subcritical pressure at all places in the closed circuit. In contrast, in the circuit of apparatus embodying the invention, whereas the refrigerant in the acceptor remains at a subcritical pressure, the refrigerant in the rejector is at supercritical pressure. This enables the entropy gain in the rejector to be substantially reduced and the thermodynamic efficiency (and also the coefficient of performance) to be increased. Further, the inventive thermodynamic cycle permits the use of refrigerants of low compression ratios, in particular carbon dioxide (CO.sub.2) or ethane (C.sub.2 H.sub.6), which enables the compression efficiency to be increased.
REFERENCES:
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patent: 3234738 (1966-02-01), Cook
patent: 3400555 (1968-09-01), Granryd
patent: 3513663 (1970-05-01), Martin, Jr. et al.
patent: 3597183 (1971-08-01), Murphy
patent: 3872682 (1975-03-01), Shook
patent: 4019679 (1977-04-01), Vogt et al.
Commercial Refrigeration (Wiltshire) Limited
King Lloyd L.
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