摘要
研究了两相喷射器中流体的流动过程,并应用质量守恒、动量守恒、能量守恒对两相喷射器建立了热力学模型,以R134a/R1234yf为工质,分析了喷射器结构参数以及工况参数对压缩/喷射制冷系统性能的影响。计算结果表明:喷射器存在最佳喷嘴出口面积和最佳喉部面积比使压缩/喷射制冷系统的性能最佳;性能系数(COP)随蒸发温度升高和冷凝温度降低而升高,而性能系数提高率(COPi)随着蒸发温度降低和冷凝温度升高而升高;相同工况下,以R134a为工质的系统性能系数、制冷量均高于R1234yf;当系统以R1234yf为工质,蒸发温度为5℃,冷凝温度为55℃时,压缩/喷射制冷系统的COP值较传统压缩制冷系统的COP值可提高26%。
The development of flow inside a two-phase ejector was investigated,and a thermodynamic model was established by mass,momentum and energy balance. The effects of two-phase ejector geometry and operating parameters on the performance of the compression/ejection refrigeration system（ CERS） were studied by using R134 a as refrigerant. Results show that there is an optimal exit area of nozzle and throat area ratio in the system. It can be derived that the coefficient of performance（ COP） increase with the increase of the evaporation temperature and the decrease of the condensation temperature. The improvement of the coefficient of performance（ COPi）increase with the decrease of the evaporation temperature and the increase of the condensation temperature. Under the same operating parametes, Compared with the R134 a CERS,the R1234 yf CERS generally has a better performance. Using R1234 yf as refrigerant,at evaporation temperature 5 ℃,condensation temperature 55 ℃,the improvement of the coefficient of performance（ COPi） peak up to 26%.
出处
《科学技术与工程》
北大核心
2017年第16期44-49,共6页
Science Technology and Engineering
基金
国家国际科技合作专项(2013DFA61580)
山西省科技攻关项目(20140313006-6)
山西省回国留学人员科研资助项目(2016-032)资助
