Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/1684
DC FieldValueLanguage
dc.contributor陳石法zh_TW
dc.contributorShih-Fa Chenen_US
dc.contributor盧 昭 暉zh_TW
dc.contributorJau-Huai Luen_US
dc.contributor.advisor沈君洋zh_TW
dc.contributor.advisorJung-Yang Sanen_US
dc.contributor.author阮德勸zh_TW
dc.contributor.authorKhuyen, Nguyen Ducen_US
dc.contributor.other中興大學zh_TW
dc.date2012zh_TW
dc.date.accessioned2014-06-05T11:41:24Z-
dc.date.available2014-06-05T11:41:24Z-
dc.identifierU0005-2406201123430700zh_TW
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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. Adamski, “Heat transfer correlations and NTU number for the longitudinal flow spiral recuperators”, Applied Thermal Engineering, Vol. 29, pp. 591-596, 2009. 24. J.Y. San, W.M. Worek, Z. Lavan, “Second-law analysis of a two- dimensional regenerator”, Energy, Vol. 12, pp. 485-496, 1987. 25. P. Naphon, “Second law analysis on the heat transfer of the horizontal concentric tube heat exchanger”, International Communications in Heat and Mass Transfer, Vol. 33, pp. 1029-1041, 2006. 26. J.Y. San and C.L. Jan, “Second-law analysis of a wet cross flow heat exchanger”, Energy, Vol. 25, pp. 939-955, 2000. 27. A. Gupta and S.K. Das, “Second law analysis of crossflow heat exchanger in the presence of axial dispersion in one fluid”, Energy, Vol. 32, pp. 664-672, 2007. 28. S. Sarangi and K. Chowdhury, “On the generation of entropy in a counterflow heat exchanger”. Cryogenics, Vol. 22, pp. 63-65, 1982. 29. J.Y. San and K.L. 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dc.identifier.urihttp://hdl.handle.net/11455/1684-
dc.description.abstractIn 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.en_US
dc.description.tableofcontentsAcknowledgement i Abstract ii Table of contents iii List of Tables and Figures v Nomenclature vii Chapter 1 Introduction 1 1.1 Preface 1 1.2 Spiral heat exchanger and main applications 2 1.3 Survey of literature 4 1.4 Objective of the Thesis 12 Chapter 2 Energy Equations for a Spiral Heat Exchanger 13 2.1 Length of a Curve in Polar Coordinates 13 2.2 Length of Archimedes' spiral in polar Coordinates 14 2.3 Geometry of a spiral heat exchanger 17 2.4 Mathematical modeling 20 2.4.1 Energy balance for hot flow 20 2.4.2 Energy balance for cold flow 22 2.4.3 Dimensionless energy equations 24 2.5 Heat transfer effectiveness of heat exchanger 28 Chapter 3 Numerical Analysis 30 3.1 The case for hot-flow capacity rate less than cold flow capacity rate 30 3.1.1 Finite-difference equations for the hot flow 30 3.1.2 Finite-difference equations for the cold flow 31 3.2 The case for hot-flow capacity rate lager than cold flow capacity rate 33 3.2.1 Finite-difference equations for the hot flow 33 3.2.2 Finite-difference equations for the cold flow 35 3.3 Computer simulation program 36 3.4 Error Analysis of numerical scheme 37 3.4.1 Equation for checking the accuracy of numerical scheme 37 3.4.2 Error analysis of numerical scheme 38 3.5 Results of heat transfer analysis 39 Chapter 4 Exergy Analysis 45 4.1 General form of exergy change rate in a flow 45 4.1.1 Concept of exergy analysis 45 4.1.2 Exergy change rate for ideal gas flow 46 4.1.3 Exergy change rate for incompressible flow 47 4.1.4 General form of exergy change rate in a flow 48 4.2 Exergy analysis for the spiral heat exchanger 49 4.3 Exergy recovery effectiveness 50 4.4 Dimensionless exergy recovery effectiveness equations 56 4.4 Results of exergy analysis and discussion 57 Chapter 5 Conclusions 61 References 63en_US
dc.language.isoen_USzh_TW
dc.publisher機械工程學系所zh_TW
dc.relation.urihttp://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2406201123430700en_US
dc.subjectexergyen_US
dc.subject有效功zh_TW
dc.subjectspiral heat exchangeren_US
dc.subjectheat transfer effectivenessen_US
dc.subjectexergy recovery effectivenessen_US
dc.subject渦捲式熱交換器zh_TW
dc.subject熱效率zh_TW
dc.subject有效功回收效率zh_TW
dc.title一個渦捲式熱交換器之熱效率與有效功回收效率zh_TW
dc.titleHeat Transfer Effectiveness and Exergy Recovery Effectiveness of a Spiral Heat Exchangeren_US
dc.typeThesis and Dissertationzh_TW
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