发动机废热驱动吸收压缩混合制冷循环动态及实验特性研究制冷及低温工程专业论文.docxVIP

研究生优秀毕业论文 大连理工大学硕士学位论文摘 大连理工大学硕士学位论文 摘 要 随着汽车消耗石化燃料的逐年增加，车辆的节能减排技术受到学者越来越多的重 视。目前大部分汽车空调采用压缩式制冷系统，然而提供冷量的同时增加了废气排放量 和发动机油耗，因此如何合理高效地回收发动机排气及冷却水的热量用于驱动吸收式制 冷循环，实现热能梯级利用是车辆节能减排一个很好的思路。 为了解车用吸收式制冷系统性能参数随时间的变化规律，更好地设计自动控制系 统，本文通过Fortran语言编写了一套R124．DMAC为工质对的鼓泡吸收式制冷系统的 动态模拟程序，基于此模拟了单效吸收式制冷系统在不同工况下性能参数随时间变化关 系，并对系统作扰动分析。接着根据汽车实际运行工况，动态模拟了不同排气参数和中 间压力对两级吸收压缩混合制冷系统性能的影响，给系统性能的预测带来便利，为机组 的实际应用提供了理论模型，同时为热物性参数的参考计算及数学模型的改进优化奠定 了基础。之后设计并搭建单效吸收式制冷系统验证样机，证实动态模拟计算结果的准确 性，及R124．DMAC工质对在运行工况下的稳定性，通过改变热空气进口温度、浓溶泵 流率和冷冻水温度对系统进行测试分析。表明了类似该工质对性能参数的制冷工质用于 汽车空调的可行性，为今后车用吸收式制冷机的研究提供参考。 关键词：汽车空调；废热回收；鼓泡吸收；动态模拟；实验验证 万方数据 发动机废热驱动吸收／压缩混合制冷循环动态及实验特陛研究Study 发动机废热驱动吸收／压缩混合制冷循环动态及实验特陛研究 Study on the Dynamic and Experimental Characteristics of Absorption—Compression Hybrid Refrigeration System Driven try Waste Heat from Automobile Engine Abstract With the increasing of fossil fuel consumed by vehicles，technologies of energy saving and emission reduction for vehicles are paid more and more attention in recent years．At present most of automobile air conditioning use compression refrigeration system to supply cooling capacity，which can raise the engine fuel consumption and exhaust gas emission． Thus it will be a good solution to investigate how to reasonably and efficiently recover the waste heat from engine exhaust gas and cooling water to drive absorption refrigeration， realizing cascade utilization of energy． In order to understand the change regulation of system performance parameter along wit}l the time and better design automatic control system in heat transfer process．this paper put forward a dynamic simulation program of air·cooled bubble absorption refrigeration system，using R1 24一DMAC as working fluids．Based on that，the author simulated the variation of single—effect absorption refrigeration system performance parameters、析m the time under different conditions，and analyzed the disturbance characteristics．Then according to vehicles operating actual situation，the author simulated the influenc