Browse > Article

Analysis of Geometrical Effects on Heat Transfer Characteristics in a Modular Flat Tube-Bundle Heat Exchanger  

Park, Byung-Kyu (School of Mechanical and Aerospace Engineering, Seoul National University)
Lee, Joon-Sik (School of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.17, no.11, 2005 , pp. 1014-1021 More about this Journal
Abstract
Flow channels with non-circular cross-sections are encountered in a wide variety of heat exchangers. Accurate friction factor and Colburn j factor data are essential for the design and viable applications of such heat exchangers. In this study, an analysis is con ducted on heat transfer and pressure drop characteristics for tube-bundle heat exchanger with various arrangements of tubes, of which their geometry could easily be modified from a circular one in a harsh environment. The parameters investigated are aspect ratio, pitch, and inclined angle of tubes. The results obtained are: (1) Aspect ratio has larger influence on the j and f factor than pitch; (2) As aspect ratio increases, both j and f factors decrease; (3) The high performance is achieved when the pitch and aspect ratio are in the range of 1.5${\~}$2.5 and 1.25${\~}$2.0, respectively; and (4) the inclined arrangements of tubes show unfavorable results for both heat transfer and pressure drop characteristics in spite of the positive possibility of condensate removals in a latent heat recovery system.
Keywords
Heat exchanger; Flat tube-bundle; Numerical analysis; Aspect ratio;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Webb, R. L., 1994, Principles of Enhanced Heat Transfer, John Wiley & Sons, inc
2 Incropera, F. P. and Dewitt, D. P., 1996, Introduction to Heat Transfer, 3rd ed., John Wiley & Sons, inc
3 Park, B. K., Kim, G. O. and Kim, M. G., 2002, Condensation heat transfer on the horizontal tubes of a modular shell and tube-bundle heat exchanger, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No. 1, pp. 21-30
4 Hewitt, G. F., Shires, G. L. and Bott, T. R., 1994, Process Heat Transfer, CRC Press, Inc
5 Park, B. K., Kim, H. B., Yearn, H. K., Lee, J. H. and Lee, J.S., 2000, Modular Condensing Heat Exchanger for heat Recovery, Japan Pat. No. 3127992
6 Olsson, C.-O., 1996, Heat transfer and pressure drop characteristics of ten radiator tubes, International Journal of Heat and Mass Transfer, Vol. 39, No. 15, pp.3211-3220   DOI   ScienceOn
7 Wang, C.-C., Chang, Y.-J., Hsieh Y.-C. and Lin, Y.-T., 1996, Sensible heat and friction characteristics of plate fin-and-tube heat exchangers having plane fins, Int. J. Refrig., Vol. 19, No. 4, pp. 223-230   DOI   ScienceOn
8 Harris, D. K. and Goldschmidt, V. W., 2002, Measurements of the overall heat transfer from combustion gases confined within elliptical tube heat exchangers, Experimental Thermal and Fluid Science, Vol. 26, pp. 3337
9 Scholten, J. W. and Murray, D. B., 1997, Heat transfer and velocity fluctuations in a staggered tube array, International Journal of Heat and Fluid Flow, Vol. 19, pp.233-244   DOI   ScienceOn
10 Jang, J.-Y., Lai, J.-T. and Liu, L.-C., 1997, The thermal-hydraulic characteristics of staggered circular finned-tube heat exchangers under dry and dehumidifying conditions, International Journal of Heat and Mass Transfer, Vol. 41, pp.3321-3337   DOI   ScienceOn
11 Kays, W. M. and London, A. L., 1984, Compact Heat Exchangers, McGraw-Hill
12 Metzger, D. E., Fan, C. S. and Haley, S. W., 1984, Effects of pin shape and array orientation on heat transfer and pressure loss in pin fin arrays, Transactions of the ASME, Vol. 106, pp.252-257   DOI
13 Sunden, B. and Faghri, M., 1998, Computer simulations in compact heat exchanger, Computational Mechanics Publications, pp. 169-225