Patent ID: 7950241

Claim:
A method for refrigeration comprising: a) providing a system for supplying a refrigerant, b) providing a condenser for removing enthalpy from said refrigerant, causing at least a portion of said refrigerant to condense to form liquid refrigerant, c) providing an evaporator in communication with the condenser for reducing the pressure of the liquid refrigerant whereby at least a portion of the liquid refrigerant forms a vapor causing heat to be removed from said refrigerant, d) providing a piston device, capable of containing refrigerant, and further being capable of forming a compression stage and an expansion stage, e) operatively coupling the piston device with the condenser and the evaporator; f) whereby the compression stage of the piston device provides refrigerant to the condenser and, g) the expansion stage of the piston device receives refrigerant from the evaporator.