DETERMINATION OF EJECTOR AREA RATIO AND SYSTEM PERFORMANCE OF A COMBINED EJECTOR-VAPOR REFRIGERATION CYCLE
In this paper,the key ejector geometry parameters for an air-cooled ejector sub-cycle in a combined ejector-vapor refrigeration cycle (EVCC) using R134a are designed by 1D analysis.Through enlarging the designed area ratios by connecting the replaceable nozzles with a main body,optimum area ratios under air-conditioning working conditions are studied experimentally.The optimum area ratios are from 3.09 to 4.16 that are lower than those mentioned in other studies.With a fixed ejector area ratio of 3.69,experiments on the EVCC performance show that: 1) The combined cycles performance is most sensitive to the ejector evaporating temperature with given operating conditions; 2) On average COP improvement of 16.3% over the vapor compression sub-cycle was obtained when ejector generating temperature is at 78℃ and ejector evaporating temperature and compressor frequency and EEV opening percentage are at 13-19℃,30-50Hz and 40-80%,respectively; 3) Real operating conditions of the combined cycle such as ejector evaporating temperature,compressor frequency and EEV opening percentage should be chose with regard to both the EVCCs COPs and COP improvements.
YAN J CAI W LI Y
School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798 School of Energy and Power Engineering,Xian Jiaotong University,PR China 710049
国际会议
西安
英文
1-8
2012-08-26（万方平台首次上网日期，不代表论文的发表时间）