Refrigerating circuit apparatus with two stage compressor and he

Details Refrigerating circuit apparatus with two stage compressor and he Refrigerating circuit apparatus with two stage compressor and he

1989-03-03

1990-10-16

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62278, 621962, 62510, F25D 2106, F25B 4702

Patent

active

049626477

ABSTRACT:
A refrigerating circuit apparatus includes a two stage compressor having an upper stage compressing cylinder and a lower stage compressing cylinder, a heat storage 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: 4833893 (1989-05-01), Morita

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