基于主动平衡的喷射式制冷系统实验研究  

Experimental research on ejector refrigeration system based on active pressure balance

作　　者：尹智超 吕金升[2] 奚修智 张博[1] YIN Zhichao;LU Jinsheng;XI Xiuzhi;ZHANG Bo(School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China;School of Transportation and Vehicle Engineering,Shandong University of Technology,Zibo 255000,China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024 [2]山东理工大学交通与车辆工程学院,山东淄博255000

出　　处：《热科学与技术》2023年第6期540-546,共7页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51876020);国家科技重大专项资助项目(2017-Ⅲ-0011-0037)。

摘　　要：针对空调系统用电占比上升,喷射式制冷系统成为压缩式制冷系统有前景的替代方案。传统喷射式制冷系统由于泵的存在,降低了系统的COP和稳定性,还会带来汽蚀和密封失效等问题。针对传统系统的不足设计开发了以R245fa为工质的主动平衡喷射式制冷系统,进一步简化系统结构提升系统能效。实验研究了主动平衡系统发生压和、冷凝压力和蒸发压力的变化规律以及储液罐热容等参数对系统运行及能效的影响。结果表明:主动平衡系统发生压力、冷凝压力、蒸发压力随时间周期性波动;参数周期性骤变后能迅速恢复正常,喷射器在实验周期性波动工况下能维持稳定运行;冷凝储液罐热容对系统能效有不利影响;使用主动平衡系统能够节省泵功,系统COP有所提升,性能优于传统喷射式制冷系统。The ejector refrigeration systems have become a promising alternative to compression refrigeration systems for the rising proportion of electricity used in air conditioning systems.However,due to the existence of the pump,the traditional ejector refrigeration system has a lower COP,worse system stability and also brings about cavitation and seal failure.Aiming at the shortcomings of traditional systems,an active balanced ejector refrigeration system is developped using R245fa as the working fluid to further simplify the system structure and improve system energy efficiency.Experiments have been conducted to study the influence of generating pressure,condensing pressure,evaporating pressure and other parameters on the active balance system operation and energy efficiency.The results show that the generating pressure,condensing pressure,,and evaporation pressure of the active balance system fluctuate periodically with time;the parameters can quickly return to normal after the periodic sudden changes,and the ejector can maintain stable operation under the experimental cyclic fluctuation conditions.The heat capacity of the condensing tank has an adverse effect on the energy efficiency of the system.The use of the active balance system for liquid return can save pump power,the system COP has been improved,and the performance is better than traditional ejector refrigeration systems.

关 键 词：喷射器 主动平衡 制冷 制冷系数 余热 

分 类 号：TB614[一般工业技术—制冷工程] TK519[动力工程及工程热物理—热能工程]