Simulation and Validation of a Two-Stage Flash Tank Cycle Using R410A as a Refrigerant

Investigating alternative system configurations is a means to improving vapor compression system COP by increasing system capacity and reducing compressor power consumption. The characterization and optimization of alternative system configurations can be conducted through the use of simulation. This paper presents a vapor compression system simulation tool capable of modeling a two-stage flash tank cycle. The key component model in the simulation of a two-stage flash tank cycle is the compressor. The component-based nature of the simulation tool allows for the use of any type of two-stage compressor model, including a vapor-injection compressor. The simulation assumptions and approach are presented in this paper. The experimental validation for both the baseline cycle and flash tank cycle are presented for an R410A system operating in both heating and cooling modes. A total of 52 test points were included in the validation for the two operating modes. The calculated capacity for 48 of the 52 test points was predicted to within 5% of experimental values.