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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 |

Appears in Collections: | 機械工程學系所 |

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