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Heat Transfer Effectiveness and Exergy Recovery Effectiveness of a Spiral Heat Exchanger
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||引用:||1. C.P. Gupta, “Working with heat exchangers: questions and answers”, Hermisphere publishing corporation, 1990. 2. G. Hewitt, G. Shires, and Y. Polezhaev, “Spiral Heat Exchangers”, International Encyclopedia of Heat and Mass Transfer, CRC Press, pp. 1044, 1997. 3. P.I. Frank and P.D.W. David, “Fundamentals of heat and mass transfer”, 3rd edition, John Wiley & Sons, 1990. 4. W.M. Kays and A.L. London, “Compact Heat Exchanger”, 2nd edition, McGraw-Hill, 1965. 5. R.E. Sonntag, C. Borgnakke, G.J.V Wylen, “Fundamentals of thermodynamics”, 6th edition, John Wiley and Sons, 2003. 6. B. Wilhelmsson, “Consider spiral heat exchangers for fouling application”, Hydrocarbon Processing, pp. 83, 2005. 7. M. Picón-Núñez, L. Canizalez-Dávalos, G. Martínez-Rodríguez, and G.T. 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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.
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