低GWP工质空调换热器性能研究

发布时间：2018-05-11 13:37

本文选题：翅片管式换热器 + 平行流式冷凝器　；参考：《天津大学》2014年硕士论文

【摘要】：随着社会的进步和人民生活水平的提高，制冷空调走进人们的日常生活，其能源消耗也占总能耗相当大的比例，而且其所用的制冷剂也会对环境造成不利影响。国际社会对能源短缺和环境保护问题日益关注，制冷空调能源的高效利用以及制冷剂的替代问题成为行业热点问题。换热器是制冷空调系统中的重要设备之一。对它的运行性能仿真模拟的准确性，对于换热器本身以及整个制冷系统的优化设计和减小能源消耗是很重要的。分析低GWP工质空调换热器的性能会对环保制冷剂的研究与替代有理论指导意义。综上所述，本文的研究工作主要有下面几项。本文在国内外现有研究成果的基础上，考虑了制冷剂的压降以及实际流动状态，建立了翅片管式蒸发器与冷凝器的稳态分布参数数学模型。利用Visual Basic计算机语言编写了翅片管式蒸发器和冷凝器的仿真计算程序，并开发了具有友好界面的仿真软件。利用这个仿真软件模拟了低GWP工质R290、HFO1234yf和HFO1234ze在翅片管式换热器中的流动和换热特性。分析了改变迎面风速、制冷剂质量流量以及管径尺寸时换热量和压降的变化情况，并与现在广泛使用的R410A进行了性能的对比分析。利用焓差热平衡室，在R290制冷系统中对翅片管式蒸发器和冷凝器的工作性能进行了测试，利用测试的数据验证了模型的正确性。除此之外还利用文献中实验数据对模型进行了验证。通过这两方面的验证，证明了所建模型具有一定的精度，可以用来对翅片管式换热器的性能进行仿真模拟。建立了汽车空调中广泛使用的平行流式冷凝器的稳态分布参数模型，，并利用文献中的实验数据进行了对比验证。最后，利用此模型对比分析了R134a及其潜在替代制冷剂HFO1234yf在平行流式冷凝器中的流动和换热特性。
[Abstract]:With the progress of society and the improvement of people's living standard, refrigeration and air conditioning come into people's daily life, its energy consumption also accounts for a large proportion of the total energy consumption, and the refrigerant it uses will also have a negative impact on the environment. The international community is paying more and more attention to energy shortage and environmental protection. The efficient utilization of refrigeration and air conditioning energy and the substitution of refrigerants have become hot issues in the industry. Heat exchanger is one of the important equipments in refrigeration and air conditioning system. The accuracy of the simulation is very important for the optimization design of the heat exchanger itself and the whole refrigeration system and the reduction of energy consumption. Analysis of the performance of low GWP refrigerant air conditioning heat exchangers will be of theoretical significance for the research and substitution of environmental refrigerants. To sum up, the research work of this paper mainly has the following several items. Based on the existing research results at home and abroad, considering the pressure drop of refrigerant and the actual flow state, a mathematical model of steady distribution parameters of finned tube evaporator and condenser is established. The simulation program of finned tube evaporator and condenser is programmed by Visual Basic language, and the simulation software with friendly interface is developed. The flow and heat transfer characteristics of low GWP refrigerant R290 HFO1234yf and HFO1234ze in finned tube heat exchanger are simulated by this simulation software. The changes of heat transfer and pressure drop when the wind speed, refrigerant mass flow rate and diameter of the tube are changed are analyzed and compared with that of R410A, which is widely used now. The performance of finned tube evaporator and condenser was tested in R290 refrigeration system by using enthalpy differential heat balance chamber. The correctness of the model was verified by the test data. In addition, the model is validated by experimental data in the literature. It is proved that the model has certain precision and can be used to simulate the performance of finned tube heat exchanger. The steady-state distribution parameter model of parallel flow condenser which is widely used in automobile air conditioning is established and compared with the experimental data in literature. Finally, the flow and heat transfer characteristics of R134a and its potential alternative refrigerant HFO1234yf in parallel flow condenser are analyzed by using this model.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657.2

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