基于■耗散理论喷淋室内水气比的优化研究
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摘要
为了分析水气比对喷淋室气-水逆流传热传质效果的影响规律,寻求喷淋换热系统优化水气比的方法。本文根据气-水传热传质能量守恒方程,推导得出理论最优条件下水气比计算方程。基于■耗散理论,对此方程进行了验证。并利用此最优水气比计算方法,对比了三种工况下(M1、MO、M2)水气比对空气出口温度、全热换热量、?效率及■煅耗散热阻的影响规律,结果表明:对于给定状态的饱和湿空气和水的传热传质过程,存在一个最优水气比,此时■耗散热阻最小且等于0,?效率达到最大值。
In order to analyze the influence of water-air ratio on heat and mass transfer of spray chamber air-water countercurrent,the optimizing method of water-air ratio in the spray chamber system is explored.Based on energy conservation equation of heat and mass transfer of air and water,the calculation equation of water-air ratio under the optimal condition is derived.And based on entransy dissipation theory,the equations are proved.By the optimal calculation method of water-air ratio,the influences of water-air ratio(M1,MO,M2)on air outlet temperature and total heat exchange capacity,exergy efficiency and entransy dissipation thermal resistance under three working conditions are compared,the results show that there is an optimal water-air ratio for each heat and mass transfer process of saturated humid air and water in a given state,while the thermal resistance of entransy dissipation is minimum and equal to 0,the exergy efficiency reaches the maximum.
In order to analyze the influence of water-air ratio on heat and mass transfer of spray chamber air-water countercurrent,the optimizing method of water-air ratio in the spray chamber system is explored.Based on energy conservation equation of heat and mass transfer of air and water,the calculation equation of water-air ratio under the optimal condition is derived.And based on entransy dissipation theory,the equations are proved.By the optimal calculation method of water-air ratio,the influences of water-air ratio(M1,MO,M2)on air outlet temperature and total heat exchange capacity,exergy efficiency and entransy dissipation thermal resistance under three working conditions are compared,the results show that there is an optimal water-air ratio for each heat and mass transfer process of saturated humid air and water in a given state,while the thermal resistance of entransy dissipation is minimum and equal to 0,the exergy efficiency reaches the maximum.
引文
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[30]齐晓霓.无填料冷却塔的理论与实验研究[D].上海交通大学,2008Qi Xiaoni.Research on the Shower Cooling Tower[D].Shanghai Jiao Tong University,2008
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[2]Kang D,Strand R K.Modeling of Simultaneous Heat and Mass Transfer Within Passive Down-Draft Evaporative Cooling(PDEC)Towers With Spray in Fluent[J].Energy&Buildings,2013,62(7):196-209
[3]Montazeri H,Blocken B,Hensen J L M.Evaporative Cooling by Water Spray Systems:CFD Simulation,Experimental Validation and Sensitivity Analysis[J].Building&Environment,2015,83:129-141
[4]杜春涛.矿井回风喷淋换热器气液两相流仿真及实验研究[D].北京:中国矿业大学,2014Du Chuntao.Air-liquid Two-Phase Flow Simulation and Empirical Studies on Mine Return Air Spraying Heat Exchangers[D].Beijing:China University of Mining&Technology,2014
[5]张寅平,朱颖心,江亿.水-空气处理系统全热交换模型和性能分析[J].清华大学学报(自然科学版),1999,39(10):35-38Zhang Yinping,Zhu Yingxin,Jiang Yi.Theoretical Analysis and Modeling of Overall Heat Transfer of Air Handling Unit by Using Spraying Water[J].Journal of Ts-inghua University(Science and Technology),1999,39(10):35-38
[6]鲍玲玲.矿井回风热能回收热湿传递研究[D].天津大学,2013Bao Lingling.The Research of Heat and Mass Transfer on Heat Recovery of Mine Exhaust Air[D].Tianjin University,2013
[7]熊慧灵.矿井回风热能回收热湿传递及换热效率研究[D].湖南科技大学,2016,35-56Xiong Huiling.Study of Heat-mass Transfer and Thermal Efficiency on Heat Recovery of Mine Return Air[D].Hunan University of Science and Technology,2016,35-56
[8]薛放心.矿井回风传热传质及热能效实验研究[D].中国矿业大学,2014Xue Fangxin.Study on Mine Return air Heat-mass Transfer and Thermal Efficiency of the Experiment[D].China University of Mining and Technology,2014
[9]Zhang L,Liu X,Jiang Y,Exergy Analysis of Parameter Unmatched Characteristic in Coupled Heat and Mass Transfer Between Humid Air and Water[J].International Journal of Heat&Mass Transfer,2015,84:327-338
[10]Muangnoi T,Asvapoositkul W,Wongwises S.An Exergy Analysis on the Performance of a Counterflow Wet Cooling Tower[J].Applied Thermal Engineering,2007,27(5/6):910-917
[11]Bertola V,Cafaro E.A Critical Analysis of the Minimum Entropy Production Theorem and Its Application to Heat and Fluid Flow[J].International Journal of Heat&Mass Transfer,2008,51(7/8):1907-1912
[12]Hesselgreaves J E.Rationalisation of Second Law Analysis of Heat Exchangers[J].International Journal of Heat&Mass Transfer,2000,43(22):4189-4204
[13]Shah R K,Skiepko T.Entropy Generation Extrema and Their Relationship With Heat Exchanger Effectiveness—Number of Transfer Unit Behavior for Complex Flow Arrangements[J].Journal of Heat Transfer,2004,126(6):994-1002
[14]Guo Zengyuan,LIANG Xingang,ZHU Hongye.Entransy—a Physical Quantity Describing Heat Transfer Ability[J].Progress in Natural Science,2006,16(10):1288-1296
[15]Guo Z Y,Zhu H Y,Liang X G.Entransy—A Physical Quantity Describing Heat Transfer Ability[J].International Journal of Heat&Mass Transfer,2007,50(13/14):2545-2556
[16]Feng H J,Chen L G,Xie Z H,et al.Constructal Entransy Dissipation Rate Minimization for"Volume-point"Heat Conduction at Micro and Nanoscales[J].Journal of the Energy Institute,2015,88(2):188-197
[17]Chen Q,Zhu H,Pan N,et al.An Alternative Criterion in Heat Transfer Optimization[J].Proceedings of the Royal Society A Mathematical Physical&Engineering Sciences,2011,467(2128):1012-1028
[18]Meng J A,Liang X G,Li Z X.Field Synergy Optimiza-tion and Enhanced Heat Transfer by Multi-longitudinal Vortexes Flow in Tube[J].International Journal of Heat&Mass Transfer,2005,48(16):3331-3337
[19]Jia H,Liu W,Liu Z.Enhancing Convective Heat Transfer Based on Minimum Power Consumption Principle[J].Chemical Engineering Science,2012,69(1):225-230
[20]Chen Q,Ren J,Meng J A.Field Synergy Equation for Turbulent Heat Transfer and Its Application[J].International Journal of Heat&Mass Transfer,2007,50(25/26):5334-5339
[21]江亿,谢晓云,刘晓华.湿空气热湿转换过程的热学原理[J].暖通空调,2011,41(3):51-64Jiang Yi,Xie Xiaoyun,Liu Xiaohua.Thermological Principle of Moist Air Heat and Moisture Conversion Processes[J].Heating Ventilating&Air Conditioning,2011,41(3):51-64
[22]谢晓云,江亿.蒸发冷却制备冷水流程的热学分析[J].暖通空调,2011,41(3):65-76Xie Xiaoyun,Jiang Yi.Thermological Analysis of Chilled Water by Evaporative Cooling Processes[J].Heating Ventilating&Air Conditioning,2011,41(3):65-76
[23]Chen L,CHEN Q,LI Z,et al.Moisture Transfer Resistance Method for Liquid Desiccant Dehumidification Analysis and Optimization[J].Science Bulletin,2010,55(14):1445-1453
[24]Chen Q,YANG K D,Wang M,et al.A New Approach to Analysis and Optimization of Evaporative Cooling System I:Theory[J].Energy,2010,35(6):2448-2454
[25]Chen Q,PAN N,GUO Z Y.A New Approach to Analysis and Optimization of Evaporative Cooling System II:Applications[J].Energy,2010,36(5):2890-2898
[26]Yuan F,Chen Q.A Global Optimization Method for Evaporative Cooling Systems Based on the Entransy Theory[J].Energy,2012,42(1):181-191
[27]Liu X B,Guo Z Y.A Novel Method for Heat Exchanger Analysis[J].Acta Physica Sinica,2009,58(7):4766-4771
[28]Guo Z Y,Liu X B,Tao W Q,et al.Effectiveness-Thermal Resistance Method for Heat Exchanger Design and Analysis[J].International Journal of Heat&Mass Transfer,2010,53(13/14):2877-2884
[29]Chen Q,Wang M,Pan N,et al.Optimization Principles for Convective Heat Transfer[J].Energy,2009,34(9):1199-1206
[30]齐晓霓.无填料冷却塔的理论与实验研究[D].上海交通大学,2008Qi Xiaoni.Research on the Shower Cooling Tower[D].Shanghai Jiao Tong University,2008
[31]Bird R B,Stewart W E,Lightfoot E N.Transport Phenomenon[M].New York:Wiley,1960:517-524
[32]李善宝.温度与饱和含湿量的经验公式[J].暖通空调,2003,33(2):112-113Li Shanbao.Empirical Formula of Temperature and Saturated Humidity Ratio[J].Heating Ventilating&Air Conditioning,2003,33(2):112-113