THE COMPARISON OF EXPERIMENTAND CFD SIMULATION IN THE HEAT PUMP SYSTEM USING THERMOBANK AND EJECTOR CYCLE FOR HEATING ROOM AND COLD STORAGE

摘要

This paper compares the CFD simulation and experimental results of the COS (condenser outlet split), DOS(diffuser outlet split) ejector refrigeration cycle with a standard ejector cycle. The system is investigatedexperimentally and CFD simulated under thermobank. The dimension L×W×H of cold storage is 3×1,6×1,4m, thermobank is 600×300×400mm.The two phase ejector is used in system which the purpose increases incoefficient of performance (COP) and decrease in compressor displacement relative to a standard vapourcompressor cycle.Nozzle with different Dnt and the adjustable ejector were also studied under differentconditions.The results ofCFD simulation showed that Dnt(diameter of motive nozzle) of 1mm andDnm(diameter of mixing chamber) of 6mm yielded the best ejector efficiency and energy efficiency ratio. TheCOS and DOS ejector cycle are advantageous because of offering the potential for more than oneevaporation temperature and it also do not include a liquid - vapour separator. When compared to standardcycle, the heat pump system using COS or DOS ejector cycle got maximum COP improvements of 24.5%with experimental results.