Refrigeration – Processes – Defrosting or frost inhibiting
Patent
1991-06-14
1992-10-20
Rivell, John
Refrigeration
Processes
Defrosting or frost inhibiting
62156, 165 29, F25D 2106
Patent
active
051560100
ABSTRACT:
A method of defrost for an outdoor side heat exchanger in a heat pump having a refrigeration circuit in which a compressor, an indoor side heat exchanger, an expansion device and the outdoor side heat exchanger are connected together so that a heat collected in the outdoor side heat exchanger is radiated from the indoor side heat exchanger and that defrosting for the outdoor side heat exchanger is started when the outdoor heat exchanger is frosted, and a temperature sensor is provided to detect a temperature of the indoor side heat exchanger, wherein the defrosting is started when the temperature detected by the temperature sensor is not higher than a first predetermined level with a downward gradient, which is calculated on the basis of the temperature, of the same temperature becoming as sharp as, or sharper than, a predetermined gradient, and the first temperature level is increased after the temperature becomes as high as a second predetermined level wherein the second level.gtoreq.the first level.
REFERENCES:
patent: 4790144 (1988-12-01), Yokouchi et al.
patent: 4852360 (1989-08-01), Harshbarger et al.
patent: 4903500 (1990-02-01), Hanson
Inoue Tetsuo
Katsuki Hikaru
Shimizu Masayuki
Takekawa Kikuo
Tsuchiyama Yuji
Rivell John
Sanyo Electric Co,. Ltd.
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