International Scientific Journal

Thermal Science - Online First

Authors of this Paper

External Links

online first only

Experimental heat and mass transfer studies on horizontal falling film absorber using water-lithium bromide

Vapour absorption systems are more viable technology option in energy and environmental perspective in cooling and heating applications. Among the four major components of vapour absorption system, the absorber plays a vital role in deciding the performance, size and cost. Horizontal falling film absorbers comparatively contain good heat and mass transfer characteristics than other type of absorbers for working fluids such as water-lithium bromide. Literature shows that experimental approach of performance evaluation of absorber is more realistic and accurate than the theoretical approach. Hence in the present work, a detail experimental study has been done on horizontal tube falling film absorber using water-lithium bromide as a working fluid. The set up consists of two major components viz. absorber and generator. Absorber contains three columns of tubes, with eight rows in each column. Detailed parametric study has been done by considering influence of spray density, cooling water flow rate, cooling water temperature and concentration on solution temperatures, cooling water temperatures, inlet and outlet concentrations, heat flux, mass flux, heat transfer coefficient and mass transfer coefficient with the help of plots. Results have been validated and literature gaps have been discussed.
PAPER REVISED: 2018-06-09
PAPER ACCEPTED: 2018-07-09
  1. Arshi Banu, P.S., Sudharsan, N.M., Review of water based vapour absorption cooling systems using thermodynamic analysis. Renew. Sustain. Energy Rev, 82(2017), pp. 3750-3761.
  2. Killion, J.D., Garimella, S., A Review of Experimental Investigations of Absorption of Wator Vapor in Liquid Films Falling Over Horizontal Tubes, HVAC&R Research, 9 (2003), 2, pp. 111-136.
  3. Jeong, S., Garimella, S., Falling-film and Droplet Mode Heat and Mass Transfer in a Horizontal Tube Absorber, International Journal of Heat and Mass Transfer, 45 (2002), 7, pp. 1445-1458.
  4. Deng, S.M., Ma, W.B., Experimental studies on the characteristics of an absorber using LiBr/H2O solution as working fluid, International Journal of Refrigeration, 22 (1999), pp. 293-301.
  5. Ibarra-Bahena, J., Romero, R.J., Performance of Different Experimental Absorber Designs in Absorption Heat Pump Cycle Technologies: A Review, Energies, 7 (2014), pp.751-766.
  6. Cord,T., Andrea, L., Experimental Investigations on Falling-Film Absorbers with Horizontal Tubes - A Review, International Refrigeration and Air Conditioning Conference, (2012). Paper 1193.
  7. Beutler, A., Hoffmann, L., Ziegler, F., Alefeld, G., Gommed, K., Grossmann, G., Shavit, A., Experimental Investigation of Heat and Mass Transfer in Film Absorption on Horizontal and Vertical Tubes, Ab-Sorption 96, International Absorption Heat Pump Conference, Montreal, Canada, 1996, pp. 409-419.
  8. Islam, M., Wijeysundera, N.E., Ho, J.C., Evaluation of Heat and Mass Transfer Coefficients for Falling Film Tubular Absorbers, Int J Refrigeration 26 (2003), 2, pp. 197-204.
  9. Soto Frances, V.M., Pinazo Ojer, J.M., Validation of a model for the absorption process of H2O(vap) by a LiBr(aq) in a horizontal tube bundle, using a multi-factorial analysis, International Journal of Heat and Mass Transfer, 46 (2003), pp.3299-3312.
  10. Kyung, I.S., Herold, K.E., Kang, Y.T., Experimental Verification of H2O/LiBr Absorber Bundle Performance with Smooth Horizontal Tubes, Int J Refrigeration, 30 (2007), 4, pp. 582-590.
  11. Yoon, J.I., Phan, T.T., Moon, C.G., Lee, H.S., Jeong, S. K., Heat and mass transfer characteristics of a horizontal tube falling film absorber with small diameter tubes, Heat Mass Transfer, 44 (2008), 4, pp.437-444.
  12. Islam, M.R., Absorption process of a falling film on a tubular absorber: Experimental and numerical study, Applied Thermal Engineering, 28 (2008), 11-12, pp.1386-1394.
  13. Bredow, D., Jain, P., Wohlfeil, A., Ziegler, F., Heat and Mass Transfer Characteristics of a Horizontal Tube Absorber in a Semi-Commercial Absorption Chiller, Int J Refrigeration, 31 (2008), pp.1273-1281.
  14. Harikrishnan, L., Maiya, M.P., Tiwari, S., Investigations on Heat and Mass Transfer Characteristics of Falling Film Horizontal Tubular Absorber, Int J Heat Mass Trans, 54 (2011), 11-12, pp.2609-2617.
  15. Arshi Banu, P.S., Sudharsan, N.M., Feasibility studies of single-effect H2O-LiBr+LiI+LiNO3+LiCl vapour absorption cooling system for solar based applications. J Chem Pharm Sci, 12(2017), pp. 1-7.
  16. Sadia Siddiqa, Anwar Hossain, M., Aqsa, Heat And Mass Transfer Effects on Natural Convection Flow Along a Horizontal Triangular Wavy Surface,Thermal Science, 21(2017), 2, pp.977 - 987.
  17. Senthil Kumar Chandrasekaran, Krishnan Srinivasan, Experimental Studies on Heat Transfer Characteristics of SS304 Screen Mesh Wick Heat Pipe, Thermal Science, 21(2017), 2, pp. S497 - S502.