Variable capacity vapor compression cooling system

Refrigeration – Processes – Fluid external of refrigeration producing cycle

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Details

62197, 62201, F25D 1702, F25B 4100

Patent

active

058063242

ABSTRACT:
A variable capacity vapor compression cooling system is presented. In the system of the present invention, air conditioning requirements are entered into a microprocessor which controls the system. Liquid phase refrigerant entering an evaporator is regulated by a microprocessor controlled electronic expansion valve. Evaporated refrigerant is delivered to a pair of compressors from the evaporator. The motors for the compressors are controlled by a controller. Each of the compressors has a feed back loop attached thereto for feeding back some of the inducted vapor phase refrigerant. The amount of vapor fed back in each loop is regulated by a corresponding microprocessor controlled multi-purpose valve. The compressed vapor phase refrigerant is then presented to a condenser which condenses the refrigerant to the liquid phase which is used for cooling, as is well known in the art. Thereafter, liquid phase refrigerant is presented to an economizer where vapor phase refrigerant (i.e., flash gas) is drawn off. The amount of vapor phase refrigerant drawn off is regulated by a microprocessor controlled electronic expansion valve. This vapor phase refrigerant is presented to the multi-purpose valves where it is directed to the respective compressors. The liquid phase refrigerant is delivered to the evaporator with the flow thereof being regulated by a microprocessor controlled electronic expansion valve. Accordingly, the above describes a complete cycle which can be capacity varied without unloading of the compressors, as described more completely below. It is an important feature of the system of the present invention that capacity is varied without unloading the compressors.

REFERENCES:
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patent: 4748831 (1988-06-01), Shaw
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patent: 5062274 (1991-11-01), Shaw
patent: 5465587 (1995-11-01), Sjoholm et al.
patent: 5653585 (1997-08-01), Fresco
Socio-Tech, Mitsubishi -Melco Water Cooled Large Screw Chilling Unit.
Hitachi-SRM Refrigerating Semi-Hermetic Screw Compressors.

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