Fig. 1: The energy performance of the standard Evans-Perkins cycle can be improved by intercooling, subcooling, flash gas removal, or the combination of them.
From: A unified approach for the thermodynamic comparison of heat pump cycles
a Single-stage Evans-Perkins heat pump cycle; (b) two-stage with intercooling (IC); (c) parallel compression with full subcooling (SC); (d) parallel compression with flash gas removal (FGR); (e) two-stage with full subcooling and partial intercooling (SC + PIC); (f) two-stage with flash gas removal and partial intercooling (FGR + PIC); (g) two-stage cycle with full subcooling and full intercooling (SC + FIC); (h) two-stage with flash gas removal and full intercooling (FGR + FIC). The state points around the cycles are represented by numbers 1–8, 1’−4’, and the letters K, L, and V.
