Hot gas defrost system

Details Hot gas defrost system Hot gas defrost system

1979-12-12

1981-09-01

King, Lloyd L.

Refrigeration

Processes

Defrosting or frost inhibiting

62196R, 62278, F25B 4100

Patent

active

042864356

ABSTRACT:
A method and apparatus utilizing a hot gas defrost system wherein superheated gas from the system compressor outlet is conducted directly into the heat exchanger to be defrosted, by-passing the condenser and thermal expansion valve to effect removal of the frost and ice accumulation on the heat exchanger surface. A portion of the hot compressor discharge gas is conducted directly into an accumulator with the liquid refrigerant received from the heat exchanger to be defrosted, the liquid refrigerant resulting from the gaseous refrigerant being condensed in the heat exchanger as the ice is melted. The refrigerant condensed to a liquid during defrost is vaporized in the accumulator thereby providing a supply of gaseous refrigerant to the compressor suction line, said gaseous refrigerant being a combination of the non-condensed discharge gas conducted to the accumulator and the liquid refrigerant vaporized in the accumulator.

REFERENCES:
patent: 2440146 (1948-04-01), Kramer
patent: 3138007 (1964-06-01), Friedman et al.
patent: 3167930 (1965-02-01), Block et al.
patent: 3429139 (1969-02-01), Wile et al.
patent: 3636723 (1972-01-01), Kramer
patent: 3677025 (1972-07-01), Payne
patent: 3734810 (1973-05-01), Davis
patent: 4122688 (1978-10-01), Mochizuki et al.

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