【作者】 白丽莹；

【导师】 杨昭；

【作者基本信息】 天津大学 ， 制冷及低温工程， 2007， 硕士

【摘要】 溴化锂吸收式制冷技术目前已经在制冷、空调、供热中广泛应用,在能源紧张的今天,更是在余热回收领域得到推广。针对传统余热回收型溴化锂吸收式制冷循环的不足,本文结合溴化锂吸收式制冷技术和热管换热器在余热回收领域的优势,对利用热管换热器回收工业气态余热直接驱动溴化锂吸收式制冷系统的余热回收循环进行了研究,与传统循环相比,具有传热效率高、初投资小、耐腐蚀,工作可靠等优点。通过对余热回收系统工作流程的分析研究,建立了溴化锂吸收式制冷系统、分离式热管换热器以及整体的数学模型,并进行了模拟研究。利用VB高级语言实现可视化编程。可视化程序中包括系统设计与优化所必须的:1)工质热物性计算模拟,包括烟气、溴化锂水溶液、水及水蒸气热物性;2)溴化锂吸收式制冷机组循环流程模拟研究,本文针对双效机组的三种流程,包括串联流程,并联先分流流程以及并联后分流流程,分别建立了稳态集中参数数学模型;3)分离式热管换热器模拟研究,采用传统等效间壁式换热器数学模型。在此基础上,采用复合型法对系统进行了优化研究。分别从性能和经济性方面对余热回收系统的溴化锂吸收式制冷系统以及热管换热器进行了优化,并通过对二者内在联系的分析,确定了整体系统的优化参数和优化目标。指出将溴化锂吸收式制冷系统应用于余热回收,不能单独追求高的性能系数,经济性更为重要。正确选择设计参数,在中等性能系数工况下,通过传热面积的合理分配,获得整体最小传热面积的优化结果。以免费的热量换来设备投资的减少,提高了余热回收系统的整体经济性。更多还原

【Abstract】 Nowadays, Li-Br absorption refrigeration have widely adopted in refrigeration, air conditioning and heating domains, as the energy problem increasing, which is popularized for heat recovery. As far as the shortages of the traditional absorption system for heat recovery is concerned, in this paper, research has developed for a system employing separated-Heat Pipe Heat Exchanger (HPHX) to recovery exhaust heat of middle temperature, which directly drive the absorption chiller. Compared to the traditional ones, the new has higher heat transfer efficiency, lower first cost, corrosion resistant and operational reliability.Basing on the analysis of the heat recovery system, mathematic models of the absorption chiller, HPHE and the whole have been established, accordingly with simuilation. A visible program adopting VB programming language is realized, which is composed of three parts, such as 1) thermodynamic characters modular of the working fluids, including Li-Br/water solution, exhaust gas, water and water vapor.2) Absorption chiller modular, including three kinds of double-effect flow, and steady lumped parameter models have been established accordingly.3) HPHE modular, using equivalence remunerator calculation model.According to the preparation work, optimization analysis of the integral system and separated parts employing complex method, aiming at both performance and economical efficiency. Further, by analyzing the inner link of the two parts, parameters and targets of optimization are selected. The results indicated that, economic is the most important factor for evaluation the heat recovery system, rather than the coefficient of the performance (COP), choosing parameters properly, the minimum heat transfer area is obtained with middle COP. The economic of the heat recovery system is increased with more free heat instead of area.更多还原