下载文档原格式
水平微肋管内有机工质R245fa的沸腾换热性能王志奇;刘力文;贺妮;夏小霞;彭德其;张建平;明镇洋【摘要】为增强有机朗肯循环发电系统中蒸发器的传热能力,对水平微肋管内新型有机工质 R245fa 的沸腾换热性能进行实验研究.研究结果表明:R245fa沸腾换热系数随质量流速增大而提高,随饱和温度和热流密度增大而减小;随着干度增大,沸腾换热系数先增大后降低,存在1个临界干度;在实验条件下,临界干度约为0.4,并与实验工况有关;超过临界干度时,质量流速对 R245fa 沸腾换热系数的强化作用增大,而饱和温度对沸腾换热的抑制作用增大;在4种常用关联式中,KANDLIKAR关联式对R245fa沸腾换热性能的预测较精确,预测值与91.6%的实验值偏差在±25%以内,绝对平均偏差为11.2%,能满足工程设计要求.%To intensify the heat transfer process of evaporator in organic Rankin cycle (ORC), flow boiling heat transfer characteristics of R245fa in a horizontal micro-fin tube were tested. The results show that boiling heat transfer coefficient increases with the increase of mass velocity of R245fa, while it decreases with the increase of saturation temperature and heat flux density. With the increase of vapor quality, boiling heat transfer coefficient reaches the maximum at a critical vapor quality. The critical vapor quality is about 0.4, and it is varied according to the operating conditions. When vapor quality is larger than the critical value, heat transfer coefficient can be promoted more remarkably at higher mass velocity or lower saturation temperature. Among the four widely used correlations, KANDLIKAR correlation has high forecast accuracy, the deviation between the forecast value and 91.6% of experimental values is within ±25%, and the absolute mean deviation is11.2%.The correlation is more precise to predict boiling heat transfer coefficients, and it can be used for the design of evaporator in ORC.【期刊名称】《中南大学学报（自然科学版）》【年(卷),期】2018(049)003【总页数】6页(P741-746)【关键词】微肋管;R245fa;沸腾换热;预测关联式【作者】王志奇;刘力文;贺妮;夏小霞;彭德其;张建平;明镇洋【作者单位】湘潭大学机械工程学院,湖南湘潭,411005;湘潭大学机械工程学院,湖南湘潭,411005;湘潭大学机械工程学院,湖南湘潭,411005;湘潭大学机械工程学院,湖南湘潭,411005;中南大学能源科学与工程学院,湖南长沙,410083;湘潭大学机械工程学院,湖南湘潭,411005;湘潭大学机械工程学院,湖南湘潭,411005;湘潭大学机械工程学院,湖南湘潭,411005【正文语种】中文【中图分类】TK124有机朗肯循环(ORC)可以将低品位热能转换成电能，具有设备简单、热效率高等优点，其市场应用前景广阔[1−2]。
R290在水平光滑管内的沸腾换热戴源德;林秦汉;邹思凯;郭玉洁【摘要】对内径为4、6 mm水平光滑铜管内R290的沸腾换热特性进行了实验研究,分析了质流密度、热通量、饱和温度、管径对沸腾传热系数以及临界干度的影响,选择5种适用于R290的水平光滑管内沸腾换热关联式,对实验工况下R290的沸腾传热系数进行预测,并与实验值对比.结果表明,管径越小、质流密度越大,或者饱和温度越高,则沸腾传热系数越大;在干度逐渐增大的过程中,沸腾传热系数随热通量的增大先增大后减小.热通量、管径相比质流密度、饱和温度对临界干度的影响更明显,且热通量越大,临界干度越小;管径越小,临界干度越大.5种关联式中,Fang关联式的预测能力最佳.%The boiling heat transfer characteristics of R290 in smooth horizontal copper tubes with inner diameters of 4,6 mm was investigated experimentally. The effects of mass flux, heat flux, saturated temperature and inner diameter of tube on boiling heat transfer coefficient and critical quality were analyzed. Five boiling heat transfer correlations which are suitable to predict the boiling heat transfer coefficients of R290 in horizontal tube were chosen to obtain the calculated data compared with experimental data of boiling heat transfer coefficient. The correlation with the minimum error between calculated and experimental data among these five correlations was considered as the most suitable one for the investigation. The results showed that boiling heat transfer coefficient increased with the decrease of inner diameter of tube, with the increase of mass flux, or with the increase of saturated temperature. It increased first and then decreased with the increase of heat flux while vapor quality wasincreasing gradually. Heat flux and inner diameter had more evident effects on critical quality than mass flux and saturated temperature. Critical quality increased with the decrease of heat flux and inner diameter. Among the five correlations, Fang correlation showed the best capacity of prediction for the boiling heat transfer coefficients.【期刊名称】《化工学报》【年(卷),期】2017(068)009【总页数】7页(P3420-3426)【关键词】R290;气液两相流;传热;水平光滑管;蒸发;预测【作者】戴源德;林秦汉;邹思凯;郭玉洁【作者单位】南昌大学机电工程学院,江西南昌 330031;南昌大学机电工程学院,江西南昌 330031;南昌大学机电工程学院,江西南昌 330031;南昌大学机电工程学院,江西南昌 330031【正文语种】中文【中图分类】TK124CFCs、HCFCs制冷剂的使用是导致温室效应以及臭氧层破坏的重要因素[1-3]。
收稿日期：2011－07－15作者简介：苏海鹏（1978—），男，陕西商洛人，工程师，主要从事热能工程和油气田热工装备的研究开发櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃櫃殭殭殭殭。
专论与综述水平管强化池沸腾传热在水套炉中的应用分析苏海鹏（华油惠博普科技股份有限公司，北京100120）摘要：油气集输换热设备中，更多关注的是强化对流传热的研究和应用，而对于管外强化沸腾换热关注较少。
在介绍池沸腾传热相关理论一般性原理的基础上，分析了影响池沸腾传热的主要因素。
通过改良换热管外表面结构型式，在换热管表面形成凹凸或多孔的结构，这种结构下沸腾传热提高了一个数量级。
选择合适的外界压力能够强化管外沸腾传热，提高了管外换热系数。
最后讨论了池沸腾传热计算的有关问题。
关键词：水平管；强化传热；池沸腾；水套炉中图分类号：TK124；TE977文献标识码：A文章编号：1008－021X （2011）08－0027－04Appliance ＆Analysis of Enhanced Pool Boiling Heat Transfer for Horizontal Tube in Water Jacket HeaterSU Hai －peng（China Oil HBP Science ＆Technology Corporation Ltd．，Beijing 100120，China ）Abstract ：The convection heat transfer enhancement were researched and applied widely on heatexchange equipment in oil －gas gathering and transportation．Based on the general principles of pool boiling heat transfer theory ，the main influenced factors to pool boiling were analyzed．The outside wall of tube was changed to make it concave －convex or porous surface ，the pool boiling heat transfer was enhanced by an order of magnitude．Correct design pressure could make the pool boiling enhancing and improving the heat transfer coefficient outside horizontal tube．Finally ，the pool boiling heat transfer calculation was discussed．Key words ：horizontal tube ；enhanced heat transfer ；pool boiling ；water jacket heater池沸腾传热现象广泛存在于能源动力、石油化工换热设备中，特别是在节能降耗要求不断提高的形势下，强化沸腾换热已经成为传热学领域研究的热点之一［1－4］。
杜明照10116117 化机研10管壳式换热器无源强化传热技术杜明照（常州大学机械工程学院，江苏常州213016）摘要：管壳式换热器是在工业中应用最为广泛的一种换热器，对其强化传热的研究对节能减排、缓解能源危机有着重要的意义。
本文首先论述了强化传热技术及其强化途径，其次具体介绍了管壳式换热器无源强化传热技术实现方法及其各种换热元件。
关键词：管壳式换热器；强化传热；节能减排The Passive Heat Transfer Enhancement of Shell and Tube Heat ExchangerDu Mingzhao(Changzhou University, College of Mechanical Engineering, Changzhou Jiangsu, 213016) Abstract: Shell and tube heat exchanger is a kind of heat exchanger which is the most widely used in industry .The research of heat transfer enhancement of shell and tube heat exchanger has an important significance for the energy conservation、emission reduction, and relieve the energy crisis. This paper discusses the technology of heat transfer enhancement and the way of strengthens, then gives a specific description of the passive heat transfer enhancement of shell and tube heat exchanger and its various components.Keywords: Shell and tube heat exchanger；Heat transfer enhancement；Energy saving and emission reduction0 引言近年来，随着中国经济的快速发展，石油、化工等行业得到了长足的发展，各工业部门都在大力发展大容量、高性能设备，并且随着能源危机的进一步加大，对换热器的性能要求进一步提高，换热器向着尺寸小、重量轻、换热能力大、换热效率高的方向发展，因此强化传热技术成为一个蓬勃发展的研究领域。
2017年第36卷第2期 CHEMICAL INDUSTRY AND ENGINEERING PROGRESS·481·化 工 进 展R410A 、R404A 、R407C 在水平强化换热管外的凝结换热欧阳新萍，舒涛，刘冰翛（上海理工大学能源与动力工程学院，上海 200093）摘要：研究了R410A 、R404A 、R407C 在水平强化管外的凝结换热，并进行了换热性能的对比。
实验管为常用的管内螺纹、管外斜翅的三维低肋管。
应用威尔逊图解法对实验数据进行处理，得到管内对流换热系数并给出Dittus-Boelter 形式的强化管管内对流换热关联式，再根据热阻分离的方法得到管外凝结换热系数。
结果表明，在相同换热参数下，凝结换热系数大小依次为R410A 、R404A 、R407C 。
3种制冷工质应用于该强化换热管的换热增强倍率分别在9.53～14.07、6.81～11.48和3.23～5.28的范围。
而R410A 、R404A 和R407C 在强化管内的强化倍率分别为1.77、1.73和1.76，三者相差不大。
R410A 管外凝结换热系数随着壁面过冷度的增大而减小，与单一制冷工质这一冷凝特性相同；而R404A 和R407C 与R410A 不同，随着壁面过冷度的增大，管外凝结换热系数增大，这主要是非共沸制冷工质管外凝结过程存在的气膜热阻所致。
关键词：凝结换热；强化换热；混合制冷剂；强化管中图分类号：TK172 文献标志码：A 文章编号：1000–6613（2017）02–0481–06DOI ：10.16085/j.issn.1000-6613.2017.02.011Experimental study of condensation heat transfer performance of R410A ，R404A and R407C on horizontal enhanced tubesOUYANG Xinping ，SHU Tao ，LIU Bingxiao（School of Energy and Power Engineering ，University of Shanghai for Science and Technology ，Shanghai200093，China ）Abstract:The performance of condensation heat transfer of R410A 、R407C and R404A were experimentally studied and compared to horizontal tubes. The enhanced tubes in this study have three dimensional inner screw and outer diagonal fins. The Wilson plot method was used to treat experimental data and obtain the coefficient of convective heat transfer in tubes and convective heat transfer correlation in the form of Dittus-Boelter. Then the condensation heat transfer coefficient on tubes can be figured out on the basis of separation of thermal resistance. The results showed that under the same conditions ，the condensation heat transfer coefficient is the sequence of R410A>R404A > R407C. The outer enhancement factor of these three refrigerants is 9.53—14.07、6.81—11.48 and 3.23—5.28. The enhancement ratio of R410A 、R404A and R407C is 1.77，1.73，1.76. The condensation heat transfer coefficient of R410A decreased with the increasing degree of super-cooling ，the same as the condensation characteristics of the single refrigerant. However ，as the increasing degree of super-cooling ，the condensation heat transfer coefficients of 404A and R407C increase. The reason is that a layer of vapor film forms in the condensation process of the non-azeotropic ，which increased the heat transfer resistance.Key words ：condensation heat transfer ；heat transfer enhancement ；mixed refrigerant ；enhanced tube为制冷换热器及强化换热、制冷技术与设备、换热器测试技术等。
