Energy Conversion in the Compressor Cylinder of the Free Piston Air Compressor

Abstract

As one of the test results of the single stage free piston air compressor of the Junkers type, the fact has been found that the compressor cylinder acts for the most part as a heat pump when the travel distance of the suction stroke is about 5∼10% of the whole stroke. Even in case of the long suction stroke, existence of some heat pump action may be easily ascertained. In the present paper, the compressor cylinder is thermodynamically analysed, using a new fundamental cycle for the reciprocating air compressor, which containes adiabatic processes and the heat pump action.