VAPOR COMPRESSION CYCLE MODEL CAPABLE OF SIMULATING WELL-DESCRIBED AND NOT-SO-WELL-DESCRIBED REFRIGERANTS

摘要

This paper presents a vapor compression cycle model consisting of a compressor, a condenser, an expansionrndevice, an evaporator, and an optional internal heat exchanger. The model allows for simulations of welldescribedrnrefrigerants using the high accuracy equations of state contained in REFPROP. Moreover, thernmodel allows one to quickly and easily create a Peng-Robinson equation of state for not-so-well-describedrnrefrigerants (ones where little or no experimental data are available). It also allows one to quickly and easilyrncreate Peng-Robinson equations of state for a large number of theoretical refrigerants by parametricallyrnvarying critical state properties, acentric factor, and ideal gas specific heat at constant pressure. In both cases,rnthe Peng-Robinson equations of state can be coupled with the cycle model to allow for easy, fast, andrninexpensive screening and evaluation of the performance potentials of a large number of well-described andrnnot-so-well-described refrigerants in a subcritical vapor compression cycle.