杨俊兰,马一太,李敏霞
YANG Jun-lan1,MA Yi-tai2,LI Min-xia2(1.Department of Energy and Mechanical Engineering

• 1:天津城市建设学院能源与机械工程系
• 2:天津大学热能研究所

摘要(Abstract)：

对超临界CO2流体的换热处理原则、换热特点以及换热机理进行了分析,超临界CO2流体特殊的物性变化使得其传热与常规流体不同,应该按"变物性"来处理。通过物性分析比较,与常规工质的凝结换热性能进行了对比研究,超临界CO2具有良好的传热和流动特性,超临界CO2冷却过程换热与凝结换热性能相当。进而分析不凝性气体对超临界CO2的性质及换热性能的影响,其物性值会有所减小,换热性能也有所降低。
The heat transfer treatment principle,heat transfer characteristics and heat transfer mechanism of supercritical CO2 fluid are analyzed.The special change trend for the properties of supercritical CO2 fluid makes its heat transfer different from the traditional fluids.Thus the changeable thermo-physical properties should be adopted in the calculation equations.By properties comparison with the traditional refrigerants,the cooling heat transfer performance of supercritical CO2 fluid is compared with the condensation heat transfer of the traditional refrigerants.The results show that their heat transfer performance is comparative due to the good heat transfer and flowing characteristics for supercritical CO2 fluid.In addition,the effect of non-condensation gas on the properties and heat transfer performance of supercritical CO2 fluid is analyzed.Both the properties values and heat transfer performance are reduced.

关键词(KeyWords)： 超临界CO2;换热机理;热物性;换热性能;不凝性气体
supercritical CO2;heat transfer mechanism;thermo-physical properties;heat transfer performance;non-condensation gas

Abstract:

Keywords:

基金项目(Foundation): 天津市科委应用基础及前沿技术研究计划项目(10JCYBJC08300)

作者(Author): 杨俊兰,马一太,李敏霞
YANG Jun-lan1,MA Yi-tai2,LI Min-xia2(1.Department of Energy and Mechanical Engineering

参考文献(References)：

• [1]曾宪阳,王洪利,马一太.CO2跨临界循环和氟利昂制冷剂循环性能分析[J].流体机械,2011,39(6):80-85.
• [2]刘雄,姜乔乔,郭浩波.CO2双级压缩制冷热泵循环性能研究[J].流体机械,2011,39(8):69-73.
• [3]龚毅,侯峰,梁志礼,等.带回热器的跨临界CO2制冷系统的试验研究[J].流体机械,2011,39(10):56-60.
• [4]巨小平,崔晓龙,邢子文.商用跨临界CO2水-水热泵热水器系统特性试验研究[J].流体机械,2010,38(5):63-66.
• [5]杨俊兰,马一太,曾宪阳,等.超临界压力下CO2流体的性质研究[J].流体机械,2008,36(1):53-57,13.
• [6]王淑香,张伟,徐进良,等.二氧化碳传热实验台的构建[J].流体机械,2012,40(5):71-75.
• [7]杨俊兰,马一太,冯刚,等.CO2气体冷却器的性能模拟与优化计算[J].流体机械,2010,38(3):62-66,84.
• [8]李志辉,姜培学.低雷诺数条件下超临界压力CO2换热实验研究[J].核动力工程,2012,31(1):33-37.
• [9]Pettersen J,Rieberer R,Leister A.Heat transfer andpressure drop characteristics of supercritical carbon di-oxide in micro-channel tubes under cooling[C].Pre-liminary Proceedings of the 4th IIR-Gustav LorentzenConference on Natural Working Fluids at Purdue,2000,99-106.
• [10]Yoon SH,Kim JH,Hwang YW,et al.Heat transferand pressure drop characteristics during the in-tubecooling process of carbon dioxide in the supercriticalregion[C].International Journal of Refrigeration,2003,26(8):857-864.
• [11]Chaobin Dang,Eiji Hihara.Heat transfer coefficient ofsupercritical carbon dioxide[C].Preliminary Pro-ceedings of the 5th IIR-Gustav Lorentzen Conferenceon Natural Working Fluids at Guangzhou,China,September 17-20,2002:100-107.
• [12]Pitla SS,Groll EA,Ramadhhyani S.New correlation topredict the heat transfer coefficient during in-tubecooling of turbulent supercritical CO2[J].Interna-tional Journal of Refrigeration,2002,25(7):887-895.
• [13]周强泰.两相流动和热交换[M].北京:水利电力出版社,1987.
• [14]程聪,张铱鈖.泡沫金属填充板式换热器的传热特性研究[J].压力容器,2012,29(2):17-20.
• [15]钱中.微型换热器瞬态传热分析[J].压力容器,2011,28(9):30-33.
• [16]付磊,曾燚林,唐克伦,等.泡沫金属填充板式换热器的传热特性研究[J].压力容器,2012,29(5):39-44.
• [17]Jackson JD,Hall WB,Fewster J,et al.Heat transfer tosupercritical pressure fluids[R].U.K.A.E.A.A.E.R.E.-R 8158,DESIGN report 34,1975.
• [18]Jackson JD,Hall WB.Influences of buoyancy on heattransfer to fluids flowing in vertical tubes under tur-bulent conditions,in turbulent forced convection inchannels and bundles[J].Kakac S,Spalding DB,Hemisphere,1979:613-640.
• [19]Cavallini A,Censi G,Delcol D,et al.Experimental in-vestigation on condensation heat transfer and pressuredrop of new HFC refrigerants(R134a,R125,R32,R410A,R236ea)in a horizontal smooth tube[J].Inter-national Journal of Refrigeration,2001,24(1):73-87.
• [20]Yoon SH,Kim JH,Hwang YW,et al.Heat transferand pressure drop characteristics during the in-tubecooling process of carbon dioxide in the supercriticalregion[J].International Journal of Refrigeration,2003,26(8):857-864.
• [21]Lemmon EW,McLinden MO,Huber ML.NIST Stand-ard Reference Database 23[D].Version 7.1.Physi-cal and Chemical Properties Division,National Insti-tute of Standards and Technology,USA.