混合制冷剂吸收式制冷性能优化分析

发布时间：2018-04-16 10:41

本文选题：吸收式制冷 + 混合制冷剂　；参考：《浙江大学》2014年硕士论文

【摘要】：随着能源短缺与环境污染等问题的日益严重,降低能耗、提高能源的综合利用率,成为解决能源问题的根本途径之一。吸收式制冷是一种可以利用余热、废热、太阳能热等低品位驱动热源的制冷方式,传统吸收式制冷机受其工质对和循环结构的制约,不适宜在深低温领域应用。在既有大量余热存在,又需要深低温冷冻的场合,混合制冷剂吸收式制冷系统具有独特的优势,越来越受到人们的关注。本文在广泛阅读文献基础上,对采用混合制冷剂的LHR (Linde-Hampson refrigerator)吸收式制冷循环和一次分凝吸收式制冷循环进行了理论分析,并且搭建了混合制冷剂吸收式制冷实验装置进行了实验研究。主要研究内容和成果如下： (1)对采用R23/R134a/DMF和R23/R227ea/DMF的LHR和一次分凝吸收式制冷系统的循环性能进行了理论优化分析,得到了循环最佳压力位和最佳浓度的优化方法及相应的优化结果。 (2)搭建了LHR吸收式制冷系统循环和一次分凝吸收式制冷系统的循环性能实验装置,并实验研究了制冷剂主节流阀、制冷剂釜底节流阀、溶液流量、制冷剂浓度、发生器和吸收器液位对系统性能的影响。 (3)实验中发现,制冷剂主节流阀的开度、冷凝温度和发生温度对系统高压均有较大影响,釜底节流阀开度,蒸发温度和吸收温度对系统低压均有较大影响。 (4)实验中,在一次分凝吸收式制冷循环中获得了比LHR吸收式制冷循环低的制冷温度,在一定程度上验证了理论分析结果的正确性。
[Abstract]:With the increasingly serious problems of energy shortage and environmental pollution, reducing energy consumption and improving the comprehensive utilization of energy become one of the fundamental ways to solve the energy problem.Absorption refrigeration is a kind of refrigeration method which can be driven by low grade heat sources such as waste heat, waste heat, solar heat, etc. The traditional absorption refrigerator is not suitable for application in deep and low temperature field because of its working fluid pair and cycle structure.In the situation where there is not only a lot of waste heat, but also need deep cryopreservation, the mixed refrigerant absorption refrigeration system has its unique advantages and has been paid more and more attention.On the basis of extensive reading of the literature, this paper makes a theoretical analysis of the LHR Linde-Hampson frigerator absorption refrigeration cycle and the primary condensed absorption refrigeration cycle using the mixed refrigerant.And the experimental device of mixed refrigerant absorption refrigeration was built.The main contents and results of the study are as follows:1) the cycle performance of LHR and primary condensing absorption refrigeration system with R23/R134a/DMF and R23/R227ea/DMF is analyzed theoretically, and the optimal pressure potential and concentration of the cycle are obtained and the corresponding optimization results are obtained.The cycle performance experimental equipment of LHR absorption refrigeration system and primary condensing absorption refrigeration system is built, and the refrigerant main throttle valve, bottom throttle valve, solution flow rate and refrigerant concentration are studied experimentally.The effect of liquid level of generator and absorber on system performance.In the experiment, it is found that the opening degree, condensation temperature and occurrence temperature of the refrigerant main throttle valve have great influence on the high pressure of the system, and the opening degree of the throttle valve at the bottom of the kettle, the evaporation temperature and the absorption temperature have great influence on the low pressure of the system.In the experiment, the refrigeration temperature is lower than that of LHR absorption refrigeration cycle in the primary condensing absorption refrigeration cycle, which verifies the correctness of the theoretical analysis to a certain extent.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB64

【参考文献】