新型双蒸发两级压缩/喷射制冷系统性能分析  

Performance analysis of novel two-stage compression/ejector refrigeration system with dual evaporation

作　　者：张崇文 李风雷 Zhang Chongwen;Li Fenglei(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学土木工程学院,太原030024

出　　处：《低温与超导》2021年第4期71-77,共7页Cryogenics and Superconductivity

基　　金：国家国际科技合作项目(2013DFA61580);山西省科技攻关项目(20140313006-6);山西省重点研发计划(201803D31036)资助。

摘　　要：为提高两级压缩制冷系统性能,提出了一种新型双蒸发两级压缩/喷射制冷系统,建立了系统热力学计算模型,对不同工况下的系统性能进行了研究。结果表明:当低温蒸发器和高温蒸发器的蒸发温度升高时,新系统性能系数和单位容积制冷量都增大;当冷凝温度升高时,性能系数、制冷量和相对于传统系统的性能系数提升率都减小;当蒸发和冷凝温度固定时,随着中间温度的升高,性能系数先增大后减小。在低温蒸发器和高温蒸发器的蒸发温度分别为-10℃和0℃、冷凝温度为40℃的情况下,当中间温度为20℃时,性能系数达到最大值4.7,与传统系统相比新系统性能系数提升率均在17%以上。In order to improve the performance of the two-stage compression refrigeration system, a novel two-stage compression/ejector refrigeration system with double evaporation was proposed in this paper. A thermodynamic calculation model of the system was established and the performance of the system under different working conditions was studied. The results show that the performance coefficient and refrigerating capacity per unit volume of the new system increase when the evaporation temperatures of the cryogenic evaporator and the high-temperature evaporator increase. When the condensation temperature increases, the performance coefficient, the cooling capacity and the performance coefficient improvement rate relative to the traditional system all decrease. When the evaporation and condensation temperatures are fixed, the performance coefficients first increase and then decrease with the increase of the intermediate temperature. When the evaporation temperatures of the low-temperature evaporator and the high-temperature evaporator are-10 ℃ and 0 ℃ respectively, and the condensation temperature is 40 ℃, when the intermediate temperature is 20 ℃, the performance coefficient reaches the maximum value of 4.7, and the performance coefficient improvement rate of the new system is above 17% compared with the conventional system.

关 键 词：双蒸发制冷 两相喷射器 两级压缩 系统性能 

分 类 号：TK123[动力工程及工程热物理—工程热物理]