摘要
论文详细介绍了非共沸混合工质汽液平衡的特点,并阐述了非共沸混合工质互补原理、节能原理及非共沸混合工质换热过程中滑移特性。从环境保护角度出发,提出在自然工质中选取具有与R22相近性能的丙烷作为替代工质的组元并结合替代混合工质热工性质的互补原理选取丁烷作为替代工质的另一组元。
论文选取CSD状态方程计算混合工质的热力学参数并详细介绍了应用CSD方程所需的基本参数的来源。混合工质在换热过程中迁移特性是混合工质理论中极为重要而复杂的一部分。现有的各种理论模型及方法只适用于有限种类的混合工质或者一定的温度范围内。通过比较分析找出精度较高、形式较为简单的混合工质导热系数及粘度计算方法与公式。
以非共沸混合工质在蒸发器中沿程温度分布变化所导致传热不可逆熵增为目标函数,建立混合工质与冷媒水在蒸发器中的稳态换热模型,以换热温差最小值为基准,分析计算得出二元混合工质R290/R600在不同组分比下的相对熵增,选取其中最小值对应组分比为最佳组分比。
在制冷工况下分析比较了R22与所确定的新工质在单级制冷循环中的制冷系数,排气温度,质量制冷量以及压缩机功耗,混合工质具有替代R22的可能性,为R22的替代工质的选取与成分的确定提出了新的方法。
This thesis introduces the characteristics of non-azeotropic mixed refrigerants’vapor-liquid phase balance in details and presents the mixed refrigerants’complementary theory, saving energy theory and the slippage identity in the process of heat transfer. From the viewpoint of protecting the environment, this thesis proposes that R290, which possesses the similar thermally physical qualities as R22, has the potential to be one of binary substituting refrigerants. Meanwhile, based on the complementary theory of thermal qualities, R600 has been chosen as the other one.
The thesis select CSD state equation to compute the thermodynamic parameters and specifically introduce the source of basic parameters requested in the equation. The slippage identity is extremely complicated and significant part in the mixed refrigerants theory. The current various academic models and methods are suitable for limited types of mixed refrigerants and certain range of temperature. The relatively high precision and simpler format of computing methods and formulas for mixed refrigerants conductivity and viscosity are presented after the comparison.
Focusing on the irreversible gain of entropy induced by temperature difference between non-azeotropic refrigerant mixtures and the cooled water, the steady heat transferring model between mixed working fluids and the cooled water has been constructed. Taking the minimum temperature difference as benchmark, an original method to compute the relative gain of entropy in different ratios of the mixtures of R290/R600 has been compiled, and the ratio with minimum gain of entropy has been selected as optimal component ratio.
The thesis analyzes and compares the single stage compressing chilling circle performances of R22 with the selected mixed refrigerants in the following facets including COP, q0 , exhaust temperature and input power. The conclusion is that it is possible to replace R22 using mixed refrigerants; a fresh and efficient way has been advanced to select the compositions of substituting refrigerants and confirm the relative ratio in the thesis.
引文
[1] Calm JM, Didion DA. Trade-offs in refrigerant selections: past, present, and future. International Journal of Refrigeration, 1998, 21(4):308-321
[2] 王惠龄,数字时代的国产空调.家电大视野,2001(4):25-28
[3] 史琳,朱明善,环保制冷剂研究的现状和趋势.制冷空调新技术进展,上海交通大学出版社,2003年11月第二版
[4] 王惠龄,制冷与低温测量技术, 华中理工大学出版社,1988
[5] Powell R L.C FC phase-out: have we met the challenge? Journal of Fluorine Chemistry, 2002, 114 (2): 237-250
[6] Molina MJ,Rowland FS. Stratospheric Sink for Chlorofluoromethane: Chlorine Atom Catalyzed Destruction of Ozone. Nature, 1974, 2 49:8 10-812
[7] 韩宝琦,李树林,制冷空调原理及应用机械工业出版社,2002年9月第二版
[8] 范保安,蒋宜捷,CFCs和替代物的温室效应.有机氟工业,1991, (3): 28-30
[9] 丁一汇,孙冷,全球变暖在改变我们的生活,气象知识,2002, (3): 4-5
[10] 郑京,温室效应对环境的影响.山东环境,2003, (1): 51-52
[11] http://tech.sina.com.cn/other/2004-03-04/1839300998.shtml
[12] 万忠民,舒水明,王惠龄,小型家用冰蓄冷空调设计与实验研究,能源技术,2000(4):43-47
[13] 孙长荪,高等工程热力学,.高等教育出版社,(1987)
[14] 陈光明,陈国邦主编,制冷与低温原理,北京:机械工业出版社,2000年,第一版
[15] 童景山,流体的热物理性质,中国石化出版社,1996.7
[16] ASHRAE HANBOOK FUNDAMENTAL, 1997
[17] Monlina M,Rowland F,Stratopheric Sink For Chlorofluorcomethane: Chlorine Atomctalysted Destruction Of Ozone .Nature,1974
[18] Montreal Protocol On Substance That Deplete the Ozone Layer .UNEP ,1994
[19] Kuijpers L .Refrigerants: The Montreal Protocal And The European Regulations.In: Short Course of The World-Wide Experiences In Using New Refrigerants.purdue Univesity ,1994
[20] 世界环境,十年来的回顾,世界环境,1995, (1) :2
[21] 丘史,京都会议概况,世界环境,1998, (1) :2
[22] Ambrose D.Correlation and Estimation of Vapour-Liquid Critical Properties I Critical Temperature of Organic Compounds, National Physical Laboratory,Teddintong,NPL Rep.Chem .92,September 1978,Corret March 1980
[23] Ambrose D Correlation and Estimation of Vapour-Liquid Critical Properties.Ⅱ Critical Pressure and Volumes of Organic Compounds, National Physical Laboratory, Teddington, NPL Rep .Chem.1979,98
[24] Jaback K G.S.M .Thesis in Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Mass, June 1984
[25] Fedors RF.Chem Eng Commun.,1982, 16:149
[26] 童景山,工程热物理学报,1994,15(4):361
[27] Pitzer K.S. J.Am Chem Soc.1955, 77:3427
[28] Pitzer K.S.D Z Lippmann, R F Curl, C M Huggins, and D E Petersen J.Am.Chem Soc.,1955, 77:3433
[29] Kay W.B., Efficient ways of heat transfer, Ind Eng Chem.1936, 28:1014
[30] 吴刚,王惠龄,模糊控制在制冷空调领域中的应用与发展[J],制冷空调,2005(3):47-51
[31] 闫波,变频空调制冷系统的数值模拟及节能分析,西安交通大学硕士论文,1995。
[32] Macleod D.B. Trans. Faraday Soc, 1923, 19:28
[33] Brock J R and R B Bird AICIE J., 1955, 1: 174
[34] 童景山,李敏,制冷系统传热方法改进,工程热物理学报,1983,4(3):220
[35] Rihani D N and L K Doraiswamy,Ind. Eng Chem Fundam,1965,4:17
[36] Lee B I and M G Kesler,AI CHE J,1975,21:510
[37] Knapp. H., R.Doring,L.Oellrich, U.Plocker, and J.M.Prausnitz. Vapor-Liquid Equilibria for Mixtures of Low Boiling Substances, Chem. Data. Ser. 1982, Vol.VI.DECHEMA
[38] Plocker Ulf, H. knapp and J M.Prausnitz,Ind Eng.Chem. Process Design Develop.,1978, 17:324
[39] Bondi A.,Ind. Eng. Chem Fundam, 1970, 9:393
[40] Yuan F F and L I Stiel., Inc.Eng.Chem Fundam.,1970,9:393
[41] Lyman T J and R P Danner.AICHE J.1976,22:759
[42] Chueh C F and A C Swenson. (a)Chem. Eng.Prog., 1973, 69(7): 83: (b) Cam J. Chem.Eng.,1973, 51:596
[43] Mason E A and L Monchick,,J Chem. Phys,1962,36 :1622
[44] Roy D and G Thodos, Ind. Eng. Chem. Fundam, 1968, 7:529
[45] Roy D and G Thodos,Ind. Eng. Chem,.Fundan.,1970.9:71
[46] Chung T H ,M Ajlan, L L Lee and K E Starling.,Generalized Multipatameter Corresponding State Correlation for Polyatomic,Polar Fluid Transport Properties,Ind.End. Chem. Process Design Develop, Submitted, 1986
[47] Chung T H, L L Lee and K E Starling.,Ind. Eng. Chem. Fundam., 1984, 23:90。
[48] Ely J F and H J M Hanley. Ind. Eng. Chem. Fundam.,1983, 22 :90
[49] Hanley H J M. Experimental Thermal Conductivity Values for the solid Substances Cryogenics, 1976,16(11):643(1976)
[50] 刘志刚,刘咸定,赵冠春,工质热物理性质计算程序的编制及应用,科学出版社,1992,6
[51] Wassiljewa A. Physik Z, 1904,5:737
[52] 童景山,应用混合工质状态方程计算制冷循环性能,化学工程 1977(6):66
[53] Jamieson D T, J B Irving and J S Tudhope, Liquid Thermal Conductivity: A Data Survey to 1973,H M Stationary Office, Edinburgh,1975
[54] Baroncinic., P.Di Filippo and G Latini. Comparison between Predicted and Experimental Thermal Conductivity Values for the Liquid Substances and the Liquid Mixture at Different Temperature and Pressure, Paper Presented at the Workshop on Thermal Conductivity Measurement, IMEKO. Budapest. March 14-16,1983
[55] Missenard F A. Rev Gen. Thermodyn.1973, 141:751
[56] FilippovLP.Vest.MoskUniv.,Ser.Fiz.Mat.Estestv,Nauk.1955,(8)10(5):67-69;Chem.Abstr.,1956,50:8276
[57] FiIippov L P. and N S Novoselova. Vest.Mosk Univ.,Ser.Fiz. Mat. Estestv, Nauk. 1955, (3)10(2):37--40;Chem.Abstr.,1955,49:11366
[58] Li C C, AICHE J.,1976, 22: 927
[59] 童景山,中国工程热物理学会,第九届年会论文集,第一分册,工程热力学与能源利用,1995
[60] Reichenberg D(a) DCS report 11, National Physical Laboratory , J, 1973, 19: 854: (C) ibid,1975,21:181
[61] Lucas K , Phase Equilibria and Fluid Properties in the Cheical Industry,Dechema, Frankfurt,1980,573
[62] Lucas K., Chem. Ing. Tech.,1981, 53: 959
[63] Reichenberg D.Symp. Transp. Prop. Fluids and Fluid Mixtures, Natl. Eng. Lab.,East Kilbride, Glasgow, Scotland, 1979
[64] Wilke C R J. Chem. Phys.,1950, 18: 517
[65] 童景山,化学工程,1977, (6):66
[66] Brokaw R S.NASA Tech Note D - 4496 ,April 1968
[67] Brokaw R S.Ind. Eng. Chem. Process Design Develop, 1969, 8:240
[68] Reichenberg D.,The Viscosities of Gas Mixture at Moderate Pressures, NPL Rept Chem.29, National Physical Laboratory, Teddington, England, May 1974
[69] Reichenberg D.,New Simplified Metheods for the Estimation of the Viscosities Gas Mixtures at Moderate Pressures , Natl.E ng.Lab.Rept Chem.53,East,Killbride, Glasgow, Scotland, May 1977
[70] Dean D E and L T Stidel, AICHE J.,1965, 11:526
[71] Chung T-H, M, Ajlan, L L Lee and K E Starling.,Ind. Eng. Chem Process Design Develop, Submitted 1986
[72] Chung T –H, L L Lee and K E Starling.,Ind.Eng.Chem.Fundam., 1984, 23:8
[73] Reichenberg D, The Viscosities of Pure Gases at High Pressures Natl.Eng.Lab.,Rept. Chem 38, East Killbride, Glasgow, Scotland, August 1975
[74] Brule M R and K E Starling. Ind Eng. Chem.Process Design Develop, 1984, 23:833
[75] Van Velzen D, R L Cardozo and H Langenkamp, Liquid Viscosity and Chemical Constitution of Organic Compounds: A New Correlation and a Compilation of Literature Data Euratom 4735e, Joint Nmber Research Centre, Ispra Establishment,Italy,1972
[76] Przezdzieki J W and T Sridhar AICHE J.,1985, 31:333
[77] Goletz E and D Tassios., Ind. Eng. Chem process Design Develop,1977 16:75
[78] Lucas K, Chem. Ing. Tech.,1981, 53:959
[79] Teja A S and P Rice,Chem.Eng. Sci., 1981 36:7
[80] Teja A S and P Rice,Ind. Eng.Chen. Fundam.,1981 20:77
[81] 章熙民,传热学(新一版),中国建筑工业出版社,1993 6:142
[82] 赵力,非共沸混合工质蒸发过程中的传热温差探讨,暖通空调,2005, 35(6):122-125
[83] 吴志刚,丁国良,混合工质两相区热力性质隐式拟和方法,工程热物理学报,2005,26(2):24-26
[84] 朱强,蒸发器中非共沸混合工质的换热特性,制冷学报,2004(1):46-50
[85] 田贯三,朱斌,靳冬青,LPG汽化压力与温度用CSD方程的分析。煤气与热力,2000,(11):33~37
[86] R. Khodabandeh. Heat transfer in the evaporator of an advanced two-phase thermosyhon loop. International Journal of Refrigeration 2005, (28):190~202
[87] 王怀信,孙军英,张凤山,吕灿仁,几种二元混合制冷剂的汽液平衡研究,高校化学程学报,1999.1