Patent ID: 7216494

Claim:
A supermarket refrigeration system comprising: a plurality of supermarket refrigeration cases for containing refrigerated goods therein; each supermarket refrigeration case comprising an evaporator and an associated compressor connected downstream therefrom; a common condenser connected downstream from said compressors; a receiver connected downstream from said common condenser and upstream from said evaporators; a liquid header extending throughout a supermarket and connecting said receiver and said evaporators; a discharge header extending throughout the supermarket and connecting said compressors to said common condenser; and an oil-bearing refrigerant mixture circulating through a refrigerant circulation path defined by said evaporators, compressors, common condenser, receiver, liquid header and discharge header; said oil-bearing refrigerant mixture lubricating said compressors without undesired pooling and without an oil separator in the refrigerant circulation path.