2002•Purdue e-Pubs (Purdue University System)Open access

Polytropic Exponents for Common Refrigerants

James R. Lenz

Abstract

Analysis of compression mechanisms requires a prediction of the pressure during the compression and expansion processes.A common model is the polytropic process, PV n = constant.This paper presents a method for determining the best polytropic exponent to use and suggests values for some common refrigerants used in the air conditioning and refrigeration industry.

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Key concepts: Polytropic process, Refrigerant, Isentropic process, Thermodynamics, Gas compressor, Adiabatic process, Constant (computer programming), Isobaric process