Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1990-08-07
1991-09-10
Tanner, Harry B.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62278, 621962, 621964, 62510, F25D 2106, F25B 4702
Patent
active
050463250
ABSTRACT:
A refrigerating circuit apparatus includes a two stage compressor having an upper stage compressing cylinder and a lower stage compressing cylinder, a heat stage tank, an upper stage side variable opening expansion valve and a lower stage side variable opening expansion valve. The upper stage side variable opening expansion valve is controlled toward its closed position for executing a heat storing operation wherein heat is discharged from refrigerant to the heat storage tank. The upper stage side variable opening expansion valve is opened and the lower stage side variable opening expansion valve is closed for carrying out a defrosting operation. Heat stored in the heat storage tank is used in the defrosting operation for removing frost accumulated on an external heat-exchanger during the heating operation.
REFERENCES:
patent: 3012415 (1961-12-01), La Porte
patent: 3838582 (1974-10-01), Redfern et al.
patent: 3869874 (1975-03-01), Ditzler
patent: 4727726 (1988-03-01), Mitani et al.
patent: 4798059, Morita
patent: 4833893 (1989-05-01), Morita
Kabushiki Kaisha Toshiba
Tanner Harry B.
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