LAUSR

Abstract In this paper a holistic optimization method of MR J-T mixture composition based on steepest descent method is developed and comprehensively presented. Modelling is carried using Peng-Robinson EoS available in RefProp 10. The optimization tool takes into account many different factors, that are usually applied separately, like minimum temperature approach in recuperative heat exchanger (which corresponds to minimum enthalpy difference under constant temperature), weighted mean temperature difference in recuperator, volume- and mass-based specific cooling powers and COP of the system, pressure and temperature limitations of commercial refrigeration compressors, non-ideal isentropic compression and suction flowrate. Carried optimization show significant coincidence between compositions optimized in terms of COP and volume-based SCP. On the other hand, mass-based SCP was found as inefficient optimization factor in case of volumetric compressors. Moreover, achieved results emphasize general rules of composing MR depending on the cooling temperature.