Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1975-05-06
1977-02-15
King, Lloyd L.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62324, F25D 2106, F25B 1300
Patent
active
040076032
ABSTRACT:
In an apparatus for defrosting an evaporator in a heat pump which is driven by a compressor, the evaporator consists of a fan and a heat exchanger through which the fan drives air for heat exchange with the heat transport medium flowing through the heat exchanger. A pressure sensitive switch is arranged to actuate a member for reversal of the pumping direction of the compressor when the pressure differential .sigma. p of the air over the heat exchanger has reached a predetermined value, and a temperature sensitive switch which senses the temperature at the heat exchanger, is arranged to actuate the reversal member to maintain the reversed pumping direction of the compressor as long as the temperature at the heat exchanger is less than or equal to 0.degree. C.
REFERENCES:
patent: 2939295 (1960-06-01), Robson
patent: 3076316 (1963-02-01), Schlichtig
patent: 3107499 (1963-11-01), Jokela
patent: 3371502 (1968-03-01), Heidorn
patent: 3465534 (1969-09-01), Sutton, Jr. et al.
patent: 3643457 (1972-02-01), Winkler
King Lloyd L.
Projectus Industriprodukter AB
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