Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1684
標題: 一個渦捲式熱交換器之熱效率與有效功回收效率
Heat Transfer Effectiveness and Exergy Recovery Effectiveness of a Spiral Heat Exchanger
作者: 阮德勸
Khuyen, Nguyen Duc
關鍵字: exergy
有效功
spiral heat exchanger
heat transfer effectiveness
exergy recovery effectiveness
渦捲式熱交換器
熱效率
有效功回收效率
出版社: 機械工程學系所
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Gomez, “Effectiveness-NTU computation with a mathematical model for cross-flow heat exchangers”, Brazilian Journal of Chemical Engineering, Vol. 24, pp. 509-521, 2007. 19. Y.H. Cho and H.M. Chang, “An effectiveness-NTU method for triple-passage counter-flow heat exchangers”, Journal of Mechanical Science and Technology, Vol. 7 (3), pp. 232-289, 1993. 20. L.C. Burmeister, “Effectiveness of a spiral-plate heat exchanger with equal capacitance rates”, Journal of Heat Transfer, Vol. 128, pp. 295-301, 2006. 21. J.Y. San, G.S. Lin and K.L. Pai, “Performance of serpentine heat exchanger: Part I-Effectiveness and heat transfer characteristics”, Applied Thermal Engineering, Vol. 29, pp. 3081-3087, 2009. 22. T. Bes and W. Roetzel, “Distribution of heat flux density in spiral heat exchangers”. International Journal of Heat and Mass Transfer, Vol. 35, pp. 1331-1347, 1992. 23. M. 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摘要: In the present study, a numerical method was developed to investigate the heat transfer performance of a spiral heat exchanger. In the spiral heat exchanger, two long metal strips are wound concentrically to create hot-flow channel and cold-flow channel. The flow of the two fluids through a spiral heat exchanger was considered counter-current, the hot-flow circulates counter-clockwise and the cold-flow circulates clockwise. The upper surface, lower surface and outer-most side of the spiral heat exchanger were assumed to be insulated. A heat transfer effectiveness and an exergy recovery effectiveness were defined and evaluated based on the calculated non-dimensional temperatures of the two counter-flow fluids in the heat exchanger. At small NTU value, the heat transfer effectiveness value initially increases with the NTU value; while at higher NTU values, after reaching the maximum heat transfer effectiveness, the heat transfer effectiveness value starts to slightly decrease. For a set of Nt and NTU values, the heat transfer effectiveness reaches a minimum value at C*=1.0. As the C* approaches zero or infinity, the heat transfer effectiveness would approach the maximum. Conversely, for a set of NTU, Nt, inlet temperature of hot flow and cold flow, and overall pressure drop factor values, as the C* approaches zero or infinity, the exergy recovery effectiveness of the spiral heat exchanger is at the minimum. The exergy recovery effectiveness reaches a maximum as the C* value nears 1.0. The result also shows that, at small values of Nt (Nt < 40), the heat transfer effectiveness value and the exergy recovery effectiveness value slightly increase with the Nt value; while these two values remain almost the same when the number of turns is larger than 40 turns.
URI: http://hdl.handle.net/11455/1684
其他識別: U0005-2406201123430700
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2406201123430700
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