利用锅炉烟气余热实现溴化锂吸收式制冷

利用锅炉烟气余热实现溴化锂吸收式制冷邵社会淮北市纺织印染动力公司一、前言当前我国能源利用率仍然很低，有一半以上能源以余（废）热排放至周围环境中。由于这些余热常具有低热、低温、品位低等不利条件；且数量和参数不稳定，波动大；载热介质含有杂质或有腐蚀性等，...     

开发利用工业余热于溴化锂吸收式制冷

开发利用工业余热于溴化锂吸收式制冷天津大学王中铮郑实吕静１前言工业余热资源分布在各工业行业，更为集中的是在钢铁、有色金属、化工、建材、石化、轻纺与机械等七个工业部门的企业中。经过多年的努力，不论对于固态载体、液态载体或气态载体余热资源，都有了一定程度...     

溴化锂吸收式制冷技术在余热回收中的研究

本文对溴化锂吸收式制冷技术在燃汽轮机电站空气冷却和柴油机排气的余热利用等节能方面的应用进行了研究。     

溴化锂吸收式制冷的耗能分析

<正> 一、引言传统的制冷是消耗电能,但为了大面积空间的空调,因电力紧张,迫使人们寻找不耗电的制冷技术,因而溴化锂吸收式制冷,得到迅速推广。国内不少杂志都发表文章,认为溴化锂制冷节电节能,并提出在热电联产机组上配置相     

太阳能驱动溴化锂吸收式制冷装置的优化设计

本文介绍了用于夏季室内空调的太阳能驱动溴化锂吸收式制冷装置的优化设计。分别就高、低两种驱动热水设计温度进行了优化计算，得出了装置的结构参数和各自的运行参数，编制的优化设计程序不仅可用于装置结构参数和运行参数的优化，还可用于预示不同驱动热水温度下装置的性能。     

溴化锂吸收式制冷技术在电厂节能中的应用研究

对溴化锂吸收式制冷技术在热电冷联供、燃气电站空气冷却等方面的应用进行了研究。图1表2参4。     

开发溴化锂吸收式制冷机回收工业余热

一、问题的提出在我国能源消耗中,据1990年统计,工业耗能占68.9%,总耗能约为6.8亿吨标煤.工业余热资源量很大,回收利用工业余热是一项重要的节能及环境保护措施.但对于温度较低范围的等热回收则显得非常困难.如化学工业和石化工业中,温度在120℃左右的余热;在钢铁工业中低于150℃左右的余热.如何充分地回收     

用于回收余热的几种溴化锂吸收式装置

用于回收余热的几种溴化锂吸收式装置上海城建学院王长庆，李冰玉上海交通大学陆震，尉迟斌１前言我国工业余热资源非常丰富。虽在各行各业都采取了有效的措施，通过各种途径回收了其中相当大的一部份，但余热利用的潜力仍很大。未利用的余热资源分布非常广，尤其是温度较...     

太阳能溴化锂吸收式制冷技术的研究进展

介绍了太阳能澳化锂吸收式制冷循环的工作原理和系统构成,具体阐述了该制冷循环的几种典型结构,包括单效、双效、两级以及三效涣化锂吸收式制冷循环,分析了各种制冷循环的优缺点以及目前研究进展;进一步讨论了太阳能澳化锂吸收式制冷机组的性能特点受冷媒水出口温度、冷却水进口温度、加热蒸汽温度、污垢系数及不凝性气体等诸多因素的影响;提出了太阳能溴化锂吸收式制冷技术现存问题,最后指出,随着科学技术的发展和绿色建筑的兴起,太阳能溴化锂吸收式制冷将会有非常大的发展前景。     

钢铁企业余热吸收制冷

调查和分析了钢铁企业余热利用的现状,得出余热制冷是钢铁企业余热利用的重要途径之一．以鞍钢为例介绍了吸收式制冷机组在钢铁企业的主要用途,具体分析了不同余热载体（蒸汽、热水、烟气）作为吸收制冷机组的驱动热源的应用情况,并介绍了国内外吸收式制冷最新研究情况,最后探讨了余热制冷在钢铁企业中经济性应用方案。     

Theoretical analysis of LiBr/H2O absorption refrigeration systems

A computational model is developed for the parametric investigation of single‐effect and series flow double‐effect LiBr/H₂O absorption refrigeration systems. The effects of generator, absorber, condenser, evaporator and dead state temperatures are examined on the performance of these systems. The parameters computed are coefficient of performance (COP), exergy destruction rates, thermal exergy loss rates, irreversibility and exergetic efficiency. The results indicate that COP and exergetic efficiency of both the systems increase with increase in the generator temperature. There exist different optimum values of generator temperature for maximum COP and maximum exergetic efficiency. The optimum generator temperature is lower corresponding to maximum exergetic efficiency as compared to optimum generator temperature corresponding to maximum COP. The effect of increase in absorber, condenser and evaporator temperatures is to decrease the exergetic efficiency of both the systems. The irreversibility is highest in absorber in both systems. Copyright © 2009 John Wiley & Sons, Ltd.     

基于有限元方法的溴化锂降膜吸收传热传质的数值研究

吸收器是吸收式制冷系统的重要部件.溴化锂溶液的降膜吸收是吸收器中最常见的传质传热形式之一.通过对溴化锂溶液在降膜吸收过程中传质和传热特性的分析,使用基于有限元法的COMSOL Multiphysics软件,建立了溴化锂溶液和水蒸汽降膜吸收的物理数学模型,计算了液膜内部温度和质量分数的分布、界面处传质通量、界面处传热通量...     

Steam absorption process of water/LiBr system inside vertical small bore pipes

In a previous paper, a numerical model for absorption within vertical pipes was proposed and compared with the experiments. Agreements were good for pipes with an OD 28–15 mm but at 10 mm pipe experiments fell below the predicted values. For smaller diameters, the difference between the surface area of the falling liquid film and that of the outer surface of the pipe is not negligible and the thickness of the liquid film is also not negligible. In this paper a new model is formulated in cylindrical coordinates and experiments using pipes with 9.52 mm and 7 mm OD are done. Smooth pipes and two kinds of internally finned pipes, originally developed and used to enhance the heat transfer characteristics of the evaporator and condenser of a refrigerator using HFC as refrigerant, are tested in the experiments. The absorption performance is enhanced by 30% when compared to the smooth pipes, but the difference between the finned pipes is small. © 2004 Wiley Periodicals, Inc. Heat Trans Asian Res, 34(1): 18–28, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20040     

Enhancement of steam absorption into a film of LiBr aqueous solution falling over a downward‐facing plate

An experimental study was performed on the enhancement of steam absorption into a LiBr aqueous solution. The enhancement method proposed here is to set an absorption heat transfer plate facing downward to generate free convection within a liquid film falling over the plate. The experiment was conducted varying the tilt angle of the heat transfer plate in a range of 40 to 90°. The heat transfer coefficients were compared for both cases of the heat transfer plate facing upward and downward. It was found from the experimental results that the downward‐facing plate has a higher heat transfer coefficient than the upward‐facing plate, which confirmed that free convection and mixing occur in the liquid film and enhance the absorption heat transfer in the case of the downward‐facing plate. The enhancement effect becomes remarkable as the tilt angle approaches horizontal, though the liquid film becomes thick and its thermal resistance increases. © 2002 Wiley Periodicals, Inc. Heat Trans Asian Res, 31(8): 606–616, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.10062     

吸收式制冷循环利用低品位热能的研究现状和发展趋势

介绍吸收式制冷循环利用低品位热能的研究现状和发展趋势。阐述吸收式制冷系统对太阳能、工业余热、生物质能和地热能四种能源的利用情况,并主要从低品位热能的选择、吸收式制冷循环系统的优化和吸收器的优化三方面分析该系统存在的问题和发展趋势。     

Exergy analysis of double effect vapor absorption refrigeration system

Energy and exergy analyses previously performed by the authors for a single effect absorption refrigeration system have been extended to double effect vapor absorption refrigeration system with the expectation of reducing energy supply as well as an interest in the diversification of the motive power employed by HVAC technologies. The total exergy destruction in the system as a percentage of the exergy input from a generator heating water over a range of operating temperatures is examined for a system operating on LiBr–H₂O solution. The exergy destruction in each component, the coefficient of performance (COP) and the exergetic COP of the system are determined. It is shown that exergy destructions occur significantly in generators, absorbers, evaporator2 and heat exchangers while the exergy destructions in condenser1, evaporator1, throttling valves, and expansion valves are relatively smaller within the range of 1–5%. The results further indicate that with an increase in the generator1 temperature the COP and ECOP increase, but there is a significant reduction in total exergy destruction of the system for the same. On the other hand, the COP and ECOP decrease with an increase in the absorber1 temperature while the total exergy destruction of the system increases significantly with a small increase in the absorber1 temperature. The results show that the exergy method can be used as an effective criterion in designing an irreversible double effect absorption refrigeration system and may be a good tool for the determination of the optimum working conditions of such systems. Copyright © 2007 John Wiley & Sons, Ltd.     

On the optimum sizing of exhaust gas‐driven automotive absorption cooling systems

An optimization analysis is presented for estimating the optimum size of absorption‐type automotive air‐conditioning system that uses waste exhaust gas as heat input. An economic analysis and optimization method were performed and combined with the thermal analysis for thermo‐economic optimization of the absorption cooling system that seems to be an alternative to the commonly used automotive air‐conditioning systems of vapor compression type. Copyright © 2007 John Wiley & Sons, Ltd.     

小型太阳能溴化锂吸收式制冷系统的优化设计

小型太阳能溴化锂吸收式制冷机是当今制冷空调业中的研究重点,其中需要解决的关键问题是换热器的合理选择和优化设计,最终达到提高效率、减小体积和节约成本的多重目的。实验室设计的5 kW吸收式制冷机组为板式换热器和管壳式换热器的结合体,经过数值计算模拟,可达到理想效果。