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An Experimental Study on Air-Side Performance of Fin-and-Tube Heat Exchangers Having Compound Enhanced Fins Under Wet Condition

복합 전열 촉진 핀이 적용된 핀-관 열교환기의 습표면 성능에 대한 실험적 연구

  • Kim, Nae-Hyun (Division of Mechanical System Engineering Incheon National University)
  • 김내현 (인천대학교 기계시스템공학부)
  • Received : 2015.06.08
  • Accepted : 2015.09.11
  • Published : 2015.09.30

Abstract

In this study, wet surface heat transfer and friction characteristics of compound enhanced fin-and-tube heat exchangers were experimentally investigated. Louver-finned heat exchangers were also tested for comparison purpose. The effect of fin pitch on j and f factor was negligible. Both j and f factor decreased as number of tube row increased. Compound enhanced fin samples yielded higher j and f factors than louver fin samples. For one row, j and f factors of compound enhanced fin samples were 11% and 43% higher than those of louver fin samples. For two row, those were 8% and 50%, and for three row, those were 17% and 53%. Heat transfer capacities at the same pressure drop of the compound enhanced fin samples were 2.0% for one row, 3.1% for two row and 8.4% for three row larger than those of louver fin samples, Data were compared with predictions of existing louver fin correlations.

본 연구에서는 복합 전열 촉진 핀 열교환기의 습표면 열전달 및 압력손실에 대하여 실험적으로 검토하였다. 비교를 위하여 널리 사용되는 루버 핀 열교환기에 대한 실험도 수행하였다. 핀 핏치(1.5mm~1.7mm)와 열수(1열~3열)를 변화시키며 열전달 및 압력손실에 미치는 영향을 검토하였다. 실험범위에서 핀 핏치가 j와 f 인자에 미치는 영향은 크지 않았다. 열수가 증가하면 j와 f 인자 모두 감소하였다. 복합 전열 핀 열교환기의 j와 f 인자가 루버 핀 열교환기의 값들보다 크게 나타났다. 1열의 경우 평균 j 인자와 f 인자는 11%, 43% 크고, 2열에서는 8%, 50%, 3열에서는 17%, 53% 크게 나타났다. 동일 압력 손실 대비 전열 성능은 복합 전열 촉진 핀 열교환기가 1열에서 2.0%, 2열에서 3.1%, 3열에서 8.4% 크게 나타났다. 실험 자료를 기존 루버 핀 상관식과 비교하였다.

Keywords

References

  1. R. L. Webb and N.-H. Kim, Principles of Enhanced Heat Transfer. 2nd ed., Taylor and Francis Pub. 2005.
  2. C.-C. Wang, "On the airside performance of fin-and-tube heat exchangers," in Heat Transfer Enhancement of Heat Exchangers, Eds., S. Kakac, A.E. Bergles, F. Mayinger, H. Yuncu, Kluwer Academic Press, pp. 141-162, 1999.
  3. A. M. Jacobi and R. K. Shah, "Air-side flow and heat transfer in compact heat exchangers:A discussion of enhancement mechanism," Heat Transfer Engineering, Vol. 19, No. 4, pp.29-41, 1998. DOI: http://dx.doi.org/10.1080/01457639808939934
  4. F. E. M. Saboya, and E. M. Sparrow, "Local and average heat transfer coefficients for one-row plate fin and tube heat exchanger configurations," J. Heat Transfer, Vol. 96, pp. 265-272, 1974. DOI: http://dx.doi.org/10.1115/1.3450189
  5. L. Goldstein and E. M. Sparrow, "Experiments on the transfer characteristics of a corrugated fin and tube heat exchanger configuration," Journal of Heat Transfer, Vol. 98, pp. 26-34, 1976. DOI: http://dx.doi.org/10.1115/1.3450464
  6. M. M. Ali and S. Ramadhyani, "Experiments on convective heat transfer in corrugated channels," Experimental Heat Transfer, Vol. 5, pp. 175-193, 1992. DOI: http://dx.doi.org/10.1080/08916159208946440
  7. F. C. McQuiston, "Heat, mass and momentum transfer data for five plate-fin-tube surfaces", ASHRAE Trans., Vol. 84, No. 1, pp. 266-293, 1978.
  8. F. C. McQuiston, "Correlation of heat, mass and momentum transport coefficients for plate-fin-tube heat transfer surfaces with staggered tubes", ASHRAE Trans., Vol. 84, No. 1, pp. 294-309, 1978.
  9. C.-C. Wang, Y.-C. Hsieh and Y.-T. Lin, "Performance of plate finned tube heat exchangers under dehumidifying conditions", J. Heat Transfer, Vol. 119, pp. 109-117, 1997. DOI: http://dx.doi.org/10.1115/1.2824075
  10. Y.-T. Lin, Y.-M. Hwang and C.-C. Wang, "Performance of the herringbone wavy fin under dehumidifying conditions", Int. J. Heat Mass Trans., Vol. 45, pp. 5035-5044, 2002. DOI: http://dx.doi.org/10.1016/S0017-9310(02)00193-X
  11. C.-C. Wang and J.-S. Liaw, "Airside performance of herringbone wavy fin-and-tube heat exchangers under dehumidifying condition - data with larger diameter tube", Vol. 55, pp. 3054-3060, 2012. https://doi.org/10.1016/j.ijheatmasstransfer.2012.02.025
  12. T. Kuvannarat, C.-C. Wang and S. Wongwises, "Effect of fin thickness on the airside performance of wavy fin-and-tube heat exchangers under dehumidifying conditions", Int. J. Heat Mass Trans., Vol. 49, pp. 2587-2596, 2006. DOI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2006.01.020
  13. C.-C. Wang and C.-T. Chang, "Heat and mass transfer for plate fin-and-tube heat exchangers, with and without hydrophilic coating", Int. J. Heat Mass Trans., Vol. 41, pp. 3109-3120, 2006. DOI: http://dx.doi.org/10.1016/S0017-9310(98)00060-X
  14. C.-C. Wang, Y.-J. Du and C.-J. Chang, "Airside performance of slit fin-and-tube heat exchangers in wet conditions", Proc. 34th National Heat Transfer Conf., NHTC'00-12092, 2000.
  15. C.-C. Wang, W.-S. Lee, W.-J. Shen and Y.-J. Chang, "Parametric study of the airside performance of slit fin-and-tube heat exchangers in wet conditions", IMechE, Vol. 215(C), pp. 1111-1121, 2001.
  16. C.-C. Wang, W.-S. Lee, W.-J. Sheu and Y.-J. Chang, "A comparison of the airside performance of the fin-and-tube heat exchangers in wet conditions; with and without hydrophilic coating", Applied Thermal Eng., Vol. 22, pp. 267-278, 2002. DOI: http://dx.doi.org/10.1016/S1359-4311(01)00090-4
  17. X. Ma, G. Ding, Y. Zhang and K. Wang, "Airside heat transfer and friction characteristics for enhanced fin-and-tube heat exchanger with hydrophilic coating under wet conditions", Int. J. Ref., Vol. 30, pp. 1153-1167, 2007. DOI: http://dx.doi.org/10.1016/j.ijrefrig.2007.03.001
  18. R. Yun, Y. Kim and Y. Kim, "Airside heat transfer characteristics of plate finned tube heat exchangers with slit fin configuration under wet conditions", Applied Thermal Eng., Vol, 29, pp. 3014-3020, 2009. DOI: http://dx.doi.org/10.1016/j.applthermaleng.2009.03.017
  19. C.-C. Wang, Y.-T. Lin and C.-J. Lee, "Heat and momentum transfer for compact louvered fin-and-tube heat exchangers in wet condition", Int. J. Heat Mass Transfer, Vol. 43, pp. 3443-3452, 2000. DOI: http://dx.doi.org/10.1016/S0017-9310(99)00240-9
  20. K. Hong and R. L. Webb, "Performance of dehumidifying heat exchangers with and without wetting coating", J. Heat Transfer, Vol. 121, pp. 1018-1026, 1999. DOI: http://dx.doi.org/10.1115/1.2826052
  21. H. Huisseune, C. T'Joen, P. De Jaeger, B. Ameel and M. De Paepe, "Performance enhancement of a louvered fin heat exchanger by using delta winglet vortex generators", Int. J. Heat Mass Transfer, Vol. 56, pp. 475-487, 2013. DOI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2012.09.004
  22. L. Tian, Y. He, Y. Tao and W. Tao, "A Comparative study on the airside performance of wavy fin-and-tube heat exchanger with punched delta winglets in staggered and in-line arrangements", Int. J. Thermal Science, Vol 48, pp. 1765-1776, 2009. DOI: http://dx.doi.org/10.1016/j.ijthermalsci.2009.02.007
  23. N.-H. Kim, "An experimental study on air-side performance of fin-and-tube heat exchangers having compound enhanced fins", J. Korean Academia-Industrial Cooperation Society, submitted, 2015. DOI: http://dx.doi.org/10.5762/KAIS.2015.16.7.4364
  24. ASHRAE Standard 41.1, "Standard method for temperature measurement", ASHRAE, 1986.
  25. ASHRAE Standard 41.2, "Standard method for laboratory air-flow measurement", ASHRAE, 1987.
  26. ASHRAE Standard 41.5, "Standard measurement guide, engineering analysis of experimental data", ASHRAE, 1975.
  27. ESDU 98005, "Design and performance evaluation of heat exchangers: the effectiveness and NTU method", Engineering and Sciences Data Unit 98005 with Amendment A, London ESDU International plc.,pp. 122-129, 1998.
  28. B-.B. Park, S.-M. You, B. Yoon and K.-C. Yoo, "Experimental study of heat transfer and pressure drop characteristics for flow of water inside circular smooth and micro-fin tubes," Korean J. Air Conditioning Refrigeration, Vol. 9, No. 4, pp. 454-461, 1997.
  29. T. E. Schmidt, "Heat transfer calculations for extended surfaces, J. of ASRE, Refrigeration Engineering, Vol. 4, pp. 351-357, 1949.
  30. C.-H. Min, J.-P. Cho, W.-K. Oh and N.-H. Kim, "Heat transfer and pressure drop characteristics of heat exchangers having plain fins under dry and wet conditions", Korean Journal of Air-Conditioning and Refrigeration, Vol. 16, No. 3, pp. 218-229, 2004.
  31. K. Torikoshi, G.-N. Xi, Y. Nakazawa and H. Asano, "Flow and heat transfer performance of a plate fin and tube heat exchanger (first report: effect of fin pitch)", Proceedings of the 10th Int. Heat Transfer Conf., Vol. 4, pp. 411-416, 1994.