Simple Method of Composition Shifting with a Distillation Column for a Heat PumpEmploying a Zeotropic Refrigerant Mixture

摘要

The work presents a simplified method of controlling heat pump capacity byshifting the composition of a zeotropic refrigerant mixture with a distillation column. Simplicity is achieved by incorporating the distillation column into the typical suction accumulator used by residential heat pumps. A U.S. patent has been applied for under the title Accumulator Distillation Insert for Zeotropic Mixtures. An experimental system employing this distillation concept has been evaluated in the laboratory for zeotropic mixtures of R32/134a (30/70) and R32/125/134a (23/25/52). For the binary mixture the circulating refrigerant composition was shifted to R32/134a (54/46). For the ternary mixture the circulating refrigerant composition was shifted to R32/125/134a (36/36/28).