Cascade refrigeration system with modular ammonia chiller units

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United States of America Patent

PATENT NO 9541311
APP PUB NO 20120117996A1
SERIAL NO

12948442

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Abstract

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A cascade refrigeration system includes an upper portion having at least one modular chiller unit that provides cooling to at least one of a low temperature subsystem having a plurality of low temperature loads, and a medium temperature subsystem having a plurality of medium temperature loads. The modular chiller unit includes a refrigerant circuit having at least a compressor, a condenser, an expansion device, and an evaporator. An ammonia refrigerant mixed with a soluble oil circulates within the refrigerant circuit. A control device may be programmed to modulate the position of the expansion device so that a superheat temperature of the ammonia refrigerant near an outlet of the evaporator fluctuates within a substantially predetermined superheat temperature range to positively return soluble oil from the evaporator to the compressor.

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Patent Owner(s)

Patent OwnerAddress
HILL PHOENIX INC2016 GEES MILL ROAD CONYERS GA 30013

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bittner, John D Bethlehem, US 15 125
Hinde, David K Atlanta, US 14 243
Poland, Joseph R Decatur, US 1 7
Zha, Shitong Conyers, US 26 45

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