R1233zd(E)和R123的水平管外冷凝换热性能研究
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摘要
针对制冷剂R1233zd(E)和R123,在饱和温度36. 1℃,冷凝水流速2. 12 m/s,2. 59 m/s和2. 90 m/s工况下,分别对水平光管和强化冷凝管GDHT-GDⅢ的管外冷凝换热系数进行测试。结果表明:R1233zd(E)的光管管外冷凝换热系数高于R123的6%～16%,R1233zd(E)的强化冷凝管GDHT-GDⅢ管外冷凝换热系数高于R123的19%～21%;采用强化冷凝管GDHT-GDⅢ时R1233zd(E)的管外冷凝换热系数是采用光管时的10. 8倍。指出R1233zd(E)可作为R123的替代物,强化冷凝管GDHT-GDⅢ能够很好地发挥R1233zd(E)的换热性能。
The condensation heat transfer coefficients outside horizontal tubes for R1233 zd (E)and R123 are tested on the horizontal smooth tube and GDHT-GDⅢ enhanced condenser tube respectively,under the saturation temperature of 36. 1 ℃,and the condensing-water flow rates of 2. 12 m/s,2. 59 m/s,and 2. 90 m/s. The results show that for smooth tube,the condensation heat transfer coefficient outside tube for R1233 zd (E) is higher than that for R123 by 6%-16%; for GDHTGDⅢ enhanced condenser tube,the condensation heat transfer coefficient outside tube for R1233 zd (E) is higher than that for R123 by 19%-21%; for R1233 zd (E),the condensation heat transfer coefficient outside GDHT-GDⅢ enhanced condenser tube is 10. 8 times of that outside smooth tube. R1233 zd (E) is a good substitute for R123,and the GDHT-GDⅢ enhanced condenser tube can give a good play to the heat transfer performance of R1233 zd (E).
The condensation heat transfer coefficients outside horizontal tubes for R1233 zd (E)and R123 are tested on the horizontal smooth tube and GDHT-GDⅢ enhanced condenser tube respectively,under the saturation temperature of 36. 1 ℃,and the condensing-water flow rates of 2. 12 m/s,2. 59 m/s,and 2. 90 m/s. The results show that for smooth tube,the condensation heat transfer coefficient outside tube for R1233 zd (E) is higher than that for R123 by 6%-16%; for GDHTGDⅢ enhanced condenser tube,the condensation heat transfer coefficient outside tube for R1233 zd (E) is higher than that for R123 by 19%-21%; for R1233 zd (E),the condensation heat transfer coefficient outside GDHT-GDⅢ enhanced condenser tube is 10. 8 times of that outside smooth tube. R1233 zd (E) is a good substitute for R123,and the GDHT-GDⅢ enhanced condenser tube can give a good play to the heat transfer performance of R1233 zd (E).
引文
[1]特灵首次推出1233zd制冷剂离心机组[EB/OL].[2014-08-18](2018-09-01).http:∥bao.hvacr.cn/201408_2049794.html.
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[8]程启康,耿飞.R1233zd(E)与R123的管内外换热性能的对比研究[J].制冷与空调,2016,16(7):17-21.
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[10]CHEN T L,WU D.Enhancement in heat transfer during condensation of an HFO refrigerant on a horizontal tube with 3D fins[J].International Journal of Thermal Sciences,2018,124:318-326.
[2]WEBB R L,RUDY T M,KEDZIERSKI M A.Prediction of the condensation coefficient on horizontal integral-fin tubes[J].Journal of Heat Transfer,1985,107(2):369-376.
[3]SUKHATME S P,JAGADISH B S,PRABHAKARAN P.Film condensation of R11 vapor on single horizontal enhanced condenser tubes[J].Journal of Heat Transfer,1990,112(1):229-234.
[4]SIEDER E N,TATE G E.Heat transfer and pressure drop of liquids in tubes[J].Industrial&Engineering Chemistry Research,1963,28:1429-1435.
[5]BRIGGS D E,YOUNG E H.Modied Wilson plot techniques for obtaining heat transfer correlations for shell and tube heat exchangers[J].Chemistry Engineering Progress Symposium,1969,92(65):35-45.
[6]CHEN T.Nusselt correlation for condensation heat transfer on cylindrical tubes[C]∥Proceedings of ASMEsummer heat transfer conference.Bellevue,2017.
[7]NAGATA R,KONDOU C,KOYAMA S.Comparative assessment of condensation and pool boiling heat transfer on horizontal plain single tubes for R1234ze(E),R1234ze(Z)and R1233zd(E)[J].International Journal Refrigeration,2016,63:157-170.
[8]程启康,耿飞.R1233zd(E)与R123的管内外换热性能的对比研究[J].制冷与空调,2016,16(7):17-21.
[9]GREGORIG R.Hautkondensation an feingwellten Oberflachen ei beruksichtigung der berflachenspan-nun-gen[J].Z Angew Cath Phys,1954(5):36-49.
[10]CHEN T L,WU D.Enhancement in heat transfer during condensation of an HFO refrigerant on a horizontal tube with 3D fins[J].International Journal of Thermal Sciences,2018,124:318-326.