Automobile air-conditioning is a necessity of present life. vapour compression refrigeration cycle used in modern automobile and refrigerant 134a are available in automobile. The compressor of automobile air-conditioning is run by engine crankshaft, which reduces the mileage of the
automobile. Waste heat recovery of internal combustion engine are two type, one is direct type or thermal energy or waste heat direct converted into electrical energy by see back effect and other is indirect type waste heat is used for rankine cycle ,sterling cycle or refrigeration cycle.