Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1994-09-02
1995-12-26
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62174, 621964, F25B 500, F25B 4100
Patent
active
054776970
ABSTRACT:
A refrigeration system generally including a compressor, a condenser and an expansion device connected between the condenser and the low pressure, suction side of the compressor. A pressure control is disposed on the discharge or high pressure side of the compressor to selectively allow refrigerant to bleed from the high pressure side of the system. The control continuously monitors the pressure of the refrigerant discharging from the compressor and bleeds refrigerant off into a bypass, including an expansion tank and a bypass capillary tube, when a predetermined pressure is reached. The bypass capillary tube is connected between the expansion tank and the low pressure side or suction line of the system. When the control senses that the compressor discharge pressure has fallen below a preset pressure, the bleed off of refrigerant from the high pressure side of the system is stopped. Refrigerant vapor remaining in the bypass is slowly metered into the suction line due to a pressure differential therebetween. The control operates to repeat this process, as necessary.
REFERENCES:
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Brochure, "American Laboratory", ISSN 0044-7749, vol. 16, No. 6, Jun. 1984.
FIG. 3, "Schematic diagram of mixed refrigerant auto-cascade system (MRA)", Cyrogenic.
Valence John H.
Wharton Keith L.
Forma Scientific, Inc.
Wayner William E.
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