KSME International Journal

, Volume 13, Issue 9, pp 640–646 | Cite as

Experimental investigation of heat and mass transfer in absorber with enhanced tubes

  • Jung-In Yoon
  • Oh-Kyung Kwon
  • Choon-Geun Moon
Thermal Engineering · Fluid Engineering · Energy and Power Engineering


In this paper, an experimental study of the absorption process of water vapor into lithium bromide solution is reported. For the purpose of developing high performance absorption chiller/heater utilizing lithium bromide solutions as working fluid, it brings the largest contribution to improve the performance of the absorber which normally requires the largest surface area among the four heat exchangers of the system. The performance of four types of absorber tubes; bare tube, bumping bare tube, floral tube and twisted floral tube, have been experimentally evaluated. The results show that the floral tube and the twisted floral tube show about 40% higher heat and mass transfer performance than the bare tube which is conventionally used in absorbers.

Key Words

Absorption Chiller/Heater Absorber Bare Tube Floral Tube Twisted Floral Tube Bumping Bare Tube Heat and Mass Transfer 



Tube diameter, m


Mass flow rate, kg/s


Heat transfer coefficient, kW/(m2·K)


Tube length, m


Groove number


Interchange heating value, kW


Log-mean temperature difference, °C


Overall heat transfer coefficient, kW/(m2·K)


Cooling water








Absorption solution



Film flow rate per length, kg/(m·s)


Mass transfer coefficient, m/h


Density, kg/m3


Average concentration, wt%


Equilibrium concentration, wt%


Log-mean concentration difference, wt%





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  1. Cosenza, F. and Vliet, G. C., 1990, “Absorption in Falling Water/LiBr Films on Horizontal Tubes,”ASHRAE Transaction, Vol. 96, Part I, pp. 693–701.Google Scholar
  2. Furukawa, M., Sasaki, N., Kaneko, T. and Nosetani, T., 1993, “Enhanced Heat Transfer Tubes for Absorber of Absorption Chiller/Heater,”Trans. of the JAR, Vol. 10, No. 2, pp. 219–226.Google Scholar
  3. Isshiki, N., Ogawa, K., Sasaki, N. and Funato, Y., 1991, “R & D of CCS (Constant Curvature Surface) Tubes for Absorption Heat Exchangers,”Proceedings of Absorption Heat Pump Conference '91, pp. 371–382.Google Scholar
  4. Kawamata, O., Otani, T., Ishitulia, N. and Aliyanchi, T., 1985, “Development of High Performance Heat Transfer Tubes for Absorber of Absorption Refrigerator,”Hitachi Corporation, Vol. 8, pp. 57–62.Google Scholar
  5. Kim, B. J. and Kang I. S., 1995, “Absorption of Water Vapor into Wavy-Laminar Falling Film of Aqueous Lithium-Bromide,”KSME Journal, Vol. 9, No. 1, pp. 115–122. (in Korea)MathSciNetGoogle Scholar
  6. Kim, B. J., and Lee C. W., 1998, “Effects of Non-Absorbable Gases on the Absorption Process of Aqueous LiBr Solution Film in a Vertical Tube (I),”Trans. of the KSME (B), Vol. 22, No. 4, pp. 489–498. (in Korea)Google Scholar
  7. Kiyota, M., Morioka, I. Ousaka, A. and Fujikawa, K., 1996, “Steam Absorption into Films of Aqueous Solution of LiBr Flowing over Multiple Horizontal Pipes,”Journal of the JSME (B), Vol. 62, No. 598, pp. 2344–2349.Google Scholar
  8. Kunugi, Y., Usui, S., Ouchi, T. and Fukuda, T., 1985, “Heat Transfer Performance of Absorber of Absorption Refrigerating Machine,”Trans. of the JAR, Vol. 2, No. 3, pp. 35–41.Google Scholar
  9. Nagaoka, Y., Nishiyama, N., Ajisaka, K. and Nakamura, M., 1987, “Research and Development of Absorption Chiller-Heater of High Performance (III) —High Performance Absorber and Evaporator-Tokyo Gas Technical Report,” Vol. 31, pp. 113–128.Google Scholar
  10. Seol, W. S., Kwon, O. K. and Yoon, J. I., 1998, “Experimental investigation of enhanced heat and mass transfer for LiBr/H2O absorber,”Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 10, No. 5, pp. 581–588. (in Korea)Google Scholar
  11. Yoon, J. I., Oh, H. K. and Kashiwagi, T., 1995, “Characteristics of Heat and Mass Transfer for a Falling Film Type Absorber with Insert Spring Tubes,”Trans. of the KSME (B), Vol. 19, No. 6, pp. 1501–1509. (in Korea)Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers (KSME) 1999

Authors and Affiliations

  • Jung-In Yoon
    • 1
  • Oh-Kyung Kwon
    • 2
  • Choon-Geun Moon
    • 2
  1. 1.Department of Refrigeration and Air-Conditioning Engineeringpukyong National UniversityPusanKorea
  2. 2.Graduate Schoolpukyong National UniversityPusanKorea

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