低熔点熔盐圆管内强迫对流换热.pdf

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1、第66卷第2期化工学报Vl01．66No．22015年2月CIESCJourna1February2015g“一研一一究一～论一一R文mR一低熔点熔盐圆管内强迫对流换热刘闪威，吴玉庭，崔武军，熊亚选。，陈夏，鹿院卫，马重芳(北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室，北京100124北京建筑工程学院供热、供燃气、通风及空调工程北京市重点实验室，北京100044)摘要：熔融盐具有使用温度高、热稳定性和传热性能好等优点，被认为是太阳能热发电系统中最有前途的传热、蓄热介质之一。通过搭建槽式太阳能熔盐集热传热实验台，进行了低熔点熔盐管内受迫对流换热实验，获得了

2、不同熔盐流速下套管式熔盐一水传热单元的总传热系数；通过最小二乘法获得了低熔点熔盐管内充分发展紊流段对流换热Nusselt数随Reynolds数的变化曲线和实验关联式，并与经典关联式进行了对比，结果表明，实验数据和Dittus．Boelter方程、Colburn方程、Seider-Tate方程以及Gnielinski方程最大偏差分别为+23％、+l3％、-10％~I1-20％，实验数据和经典公式符合较好。关键词：低熔点熔盐；强迫对流；对流传热系数DOI：10．11949~．issn．0438—1157．20140861中图分类号：TK51文献标志码：A文章编号：0438-1157(2015

3、)02一O530—07Forcedconvectionheattransferwithlow—meltingpointmoltensaltincircularpipeLIUShanwei，WUYuting，CUIWujun，X1ONGYaxuan，CHENXia，LUYuanwei，MAChongfang(IKeyLaboratoryofEnhancedHeatTransferandEnergyConservationofMinistryofEducation，KeyLaboratoryofHeatTransfe，andEnergyConversionofBeijingMunicipal

4、ity，BeringUniversityofTechnology，Beijing100124，China；KeyLaboratoryofHVAC,BeijingUniversityofCivilEngineeringandArchitecture，Beijing100044，China)Abstract：Moltensaltasoneofthemostpromisingheattransferandheatstoragemediaintheconcentratingsolarpower(CSP)systemhassuchadvantagesashighandwideliquidtempe

5、rature，goodheattransferperformance，lowoperationpressureandgoodthermalstability．Anexperimentalstudyonturbulentconvectiveheattransferwithlow．meltingpointmoltensaltinacirculartubewasconductedbyusingasel~madeparabolictroughsolarcollectingandheattransfersystemwithmoltensalt．Thetotalheattransfercoeffic

6、ientsfromwatertosaltinaconcentrictubeheatexchangeratdifferentflowrateswereobtained．ThechangeofNusseltnumberoflow．meltingpointmoltensaltwithReynoldsnumberwascalculatedwiththeleast—squaremethodandtheexperimentalcorrelationwereobtained．Comparisonwasalsomadebetweenexperimentaldataandwell—knownconvect

7、iveheattransfercorrelations．withthemaximumdeviationsbetweenthepresentdataandcurvespredictedbvDittusBoelter,Colbum，Seider-Tate，andGnielinskiequationsof+23％，+13％一10％and-20％respectively．Keywords：low—meltingpointmoltensalt