Abstract: A high-pressure refrigerant driven refrigeration apparatus has a heat exchanger charged with a refrigerant for transferring heat from a heat source to the refrigerant, and a refrigerant motor connected to the heat exchanger and powered by the heated high pressure refrigerant. A compressor is connected to the refrigerant motor and driven thereby. The system includes a condenser connected to the refrigerant motor and to the compressor for liquefying the refrigerant from the refrigerant motor and from the compressor and an evaporator connected to the compressor for receiving the expanded refrigerant from the compressor. The refrigerant motor may be a reciprocating or a rotary motor.