Patent ID: 8726677

Claim:
An apparatus arranged to provide air conditioning comprising: a control element; a driving member; a first heat exchanger; a liquid state expander arranged to produce mechanical work as a first rotational force to said driving member responsive to refrigerant in a liquid state; a vapor state expander arranged to produce mechanical work as a second rotational force to said driving member responsive to a refrigerant in a superheated vapor state; a second heat exchanger; a compressor driven by said driving member; a condenser; and an evaporator, wherein in a waste heat cooling mode said control element is arranged to: feed a first portion of the output of said condenser to said liquid state expander via said first heat exchanger, said first portion in a liquid state at the input to said liquid state expander; feed a second portion of the output of said condenser to said vapor state expander via said second heat exchanger, said fed second portion in a vapor state at the input to said vapor state expander responsive to heat received via said second heat exchanger; feed the output of said liquid state expander to said evaporator; feed a first portion of the output of said evaporator to the input of said compressor; and feed the output of said compressor and the output of said vapor state expander to the input of said condenser.