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Heat Transfer Performance of a Spiral Heat Exchanger
|關鍵字:||spiral heat exchanger;螺旋式熱交換器;effectiveness;second-law efficiency;Reynolds number;熱效率;第二定律效率;雷諾數||出版社:||機械工程學系所||引用:||1.J.Y. San, W.M. Worek, Z. Lavan, “Second-law analysis of a two- dimensional regenerator”, Energy, Vol. 12, pp. 485-496, 1987. 2.N.E. Wijeysundera, J.C. Hartnett, S. Rajaseker, “The effectiveness of a spiral coil heat exchanger”, International Communications in Heat and Mass Transfer, Vol. 23, pp. 623-632, 1996. 3.J.Y. Jang, M.T. Wang, “Transient response of cross flow heat exchangers with one fluid mixed”, Heat and Fluid Flow, Vol. 8, pp. 182-186, 1987. 4.J.Y. San, C.L. Jan, “Second-law analysis of a wet cross flow heat exchanger”, Energy, Vol. 25, pp. 939-955, 2000. 5.P. Naphon, S. Wongwises, “A study of the heat transfer characteristic of a compact spiral coil heat exchanger under wet-surface conditions”, Experimental Thermal and Fluid Science, Vol. 29, pp. 511-521, 2005. 6.T.J. Rennie, V.G.S. Raghavan, “Numerical studies of a double-pipe helical heat exchanger”, Applied Thermal Engineering, Vol. 26, pp. 1266-1273, 2006. 7.J.R. Burns, R.J.J. Jachuck, “Condensation studies using cross- corrugated polymer film compact heat exchanger”, Applied Thermal Engineering, Vol. 21, pp. 495-510, 2001. 8.P.K. Sahoo, Md.I.A. Ansari, A.K. Datta, “A computer based iterative solution for accurate estimation of heat transfer coefficients in a helical tube heat exchanger”, Journal of Food Engineering, Vol. 58, pp. 211-214, 2003. 9.T.J. Rennie, V.G.S. Raghavan, “Experimental studies of a double-pipe helical heat exchanger”, Experimental Thermal and Fluid Science, Vol. 29, pp. 919-924, 2005. 10.D.G. Prabhanjan, G.S.V. Raghavan, T.J. Rennie, “Comparison of heat transfer rates between a straight tube heat exchanger and a helically coiled heat exchanger”, International Communications in Heat and Mass Transfer, Vol. 29, pp. 185-191, 2002. 11.B.A. Qureshi, S.M. Zubair, “Second-law-based performance evaluation of cooling towers and evaporative heat exchangers”, International Journal of Thermal Sciences, Vol. 46, pp.188-198, 2007. 12.S. Wongwises, M. Polsongkram, “Condensation heat transfer and pressure drop of HFC-134a in a helically coiled concentric tube-in-tube heat exchanger”, International Journal of Heat and Mass Transfer, Vol. 29, pp. 4386-4398, 2006. 13.C.Y. Park, P. Hrnjak, “Effect of heat conduction through the fins of a microchannel serpentine gas cooler of transcritical system”, International Journal of Refrigeration, Vol. 30, pp. 389-397, 2007. 14.V. Kumar, S. Saini, M. Sharma, “Pressure drop and heat transfer in tube-in-tube helical heat exchanger”, Chemical Engineering Science, Vol. 61, pp. 4403-4416, 2006. 15.A. Gupta, S.K. Das, “Second law analysis of crossflow heat exchanger in the presence of axial dispersion in one fluid”, Energy, Vol. 35, pp. 664-672, 2007. 16.S.Y. Wu, X.F. Yuan, Y.R. Li, L. Xiao, “Energy transfer effectiveness on heat exchanger for finite pressure drop”, Energy, Vol. 32, pp. 2110-2120, 2007. 17.R. Yun, Y. Kim, C. Park, “Numerical analysis on a microchannel evaporator designed for air-conditioning systems”, Applied Thermal Engineering, Vol. 27, pp. 1320-1326, 2007. 18.T.L. Ngo., Y. Kato, K. Nikitin, T. Ishizuka, “Heat transfer and pressure drop correlations of microchannel heat exchangers with S-shaped and zigzag fins for carbon dioxide cycles”, Experimental Thermal and Fluid Science, Vol. 32, pp. 560-570, 2007. 19.林俊憲，“一個蛇形管式交叉流熱交換器之性能測試”，碩士論文，中興大學機械系，2008。 20.J.Y. San, G.S. Lin, K.L. Pai,“Performance of serpentine heat exchanger: Part I－Effectiveness and heat transfer characteristics”, Applied Thermal Engineering, Vol. 29, pp. 3081-3087, 2009. 21.白凱莉，“一個蛇行熱交換器之熱效率與第二定律效率之分析”，碩士論文，中興大學機械系，2008。 22.J.Y. San, K.L. Pai,“Performance of a serpentine heat exchanger: Part II－Second-law efficiency”, Applied Thermal Engineering, Vol. 29, pp. 3088-3093, 2009. 23.W.M. Kays, A.L. London, Compact Heat Exchanger (3rd edition ), Mcgraw-Hill,1984. 24.A Bejan, Advanced Engineering thermodynamics, John Wiley and Sons,1988.||摘要:||
The heat transfer performance of a spiral heat exchanger was numerically and experimentally investigated. In the analysis, a one-dimensional heat transfer model was used. The tube flow is mixed and it flows spirally from the inlet to the outlet. The flow outside the tube is unmixed and it flows radially from the centerline of the spiral tube toward outside. The non-dimensional temperature of the tube flow was evaluated and it yielded the effectiveness and second-law efficiency of the heat exchanger. For a fixed Ntu value, as the ratio of flow heat capacity rates (Ct*) is 1.0, the effectiveness is at the minimum. As the Ct* approaches zero or infinity, the effectiveness would approach the maximum. Conversely, for a fixed Ntu value, as the Ct* value nears 1.0, the second-law efficiency is at the maximum. The effectiveness and second-law efficiency of two heat exchangers in overall-counterflow arrangement appears to be much higher to those of a single heat exchanger. In the experiment, the gas-side (outside the tube) convective heat transfer coefficient (h) and Darcy friction factor (f) of a test model with a five-lap spiral tube was measured. The Reynolds number was in the range 353-2593, The result shows that the f value increases with the (Re-300)^(-0.393).The Nu value increases with the (Re/1000+8)^(3.169).
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