Preliminary study on CO2 transcritical ejector enhanced compressor refrigeration system for independent space cooling and dehumidification

摘要

This study presents a single CO2 vapour-compression system for independent cooling and dehumidification of indoor air conditioning systems. A CO2 gas cooler outlet split (GOS) ejector system is introduced to generate two levels of evaporating temperature, and therefore indoor air temperature and humidity can be controlled independently. The two-phase ejector improves energy efficiency of the CO2 transcritical system by recovering expansion work loss. The steady state analysis shows that the COP of the CO2 ejector system is 12-60% better than that of standard isenthalpic expansion one when the humidity load ratio covers 10-50% of the total thermal load. Moreover, transient performances of the CO2 GOS ejector system under different indoor load conditions are simulated. It proves that the hybrid GOS GCHP(ing) system offers a solution to the future air conditioning sector to use the environmentally friendly CO2 as long term working fluid. (C) 2019 Elsevier Ltd and IIR. All rights reserved.