A study of the characteristics of heat transfer for an ammonia-water bubble mode absorber in absorption heat pump systems

Abstract

An absorber is a major component in absorption refrigeration systems and its performance greatly affects the overall system performance. In this study, experimental analyses of the characteristics of heat transfer for removal of absorption heat in an ammonia-water bubble mode absorber were performed. The heat transfer coefficient was estimated as a function of the input gas flow rate, solution flow rate, temperature, concentration, absorber diameter and height, and input flow direction. The increase of gas and solution flow rate affects positively in heat transfer. However, the increase of solution temperature and concentration affects negatively. Moreover, under the same Reynolds number, countercurrent flow is superior to cocurrent flow in heat transfer performance. In addition, from these experimental data, empirical correlations that can explain easily the characteristics of heat transfer are derived.

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References

  1. Christensen, R.N., Kang, Y. T., Garimella, S. and Priedeman, D., “Generator Absorber Heat Exchanger (GAX) Cycle Modeling, Component Design and Tests,” Final Report to LG Electronics, Contract number: 862805-01/062805 (1996).

  2. Kang, Y. T., Akisawa, A. and Kashiwagi, T., “Analytical Investigation of Two Different Absorption Modes: Falling Film and Bubble Types,”International Journal of Refrigeration,23, 430 (2000).

    Article  CAS  Google Scholar 

  3. Kang, Y. T., Akisawa, A. and Kashiwagi, T., “Experimental Correlation of Combined Heat and Mass Transfer for NH3-H2O Falling Film Absorption,”International Journal of Refrigeration,22, 250 (1999).

    Article  CAS  Google Scholar 

  4. Lee, K. B., Chun, B.H., Lee, J. C., Park, C. J. and Kim, S.H., “Absorption Characteristics of Ammonia-water System in the Cylindrical Absorber,”Korean J. Chem. Eng.,19, 87 (2002).

    CAS  Google Scholar 

  5. Lee, K. B., Chun, B.H., Lee, J. C., Park, C. J. and Kim, S.H., “Comparison of Heat and Mass Transfer of Falling Film and Bubble Mode in Ammonia-water,”Experimental Heat Transfer, In Press (2002).

  6. McCabe, W.L., Smith, J. C. and Harriott, P., “Unit Operations of Chemical Engineering,” McGraw-Hill, Singapore, 5th ed., 115 (1993).

    Google Scholar 

  7. Perry, R. H. and Green, D.W., “Perry’s Chemical Engineers’ Handbook,” 6th ed., McGraw-Hill International Editions, Japan (1984).

    Google Scholar 

  8. Reid, R. C., Prausnitz, J. M. and Poling, B. E., “The Properties of Gases & Liquids,” McGraw-Hill, Singapore (1986).

    Google Scholar 

  9. Sujatha, K. S., Mani, A. and Srinivasa Murthy, S., “Analysis of a Bubble Absorber Working with R22 and Five Organic Absorbents,”Heat and Mass Transfer,32, 255 (1997).

    Article  CAS  Google Scholar 

  10. Sujatha, K. S., Mani, A. and Srinivasa Murthy, S., “Experiments on a Bubble Absorber,”International Community Heat Mass Transfer,26(7), 975 (1999).

    Article  CAS  Google Scholar 

  11. Sung, W. M., Huh, D. G. and Ryu, B. J., “Development and Application of Gas Hydrate Reservior Simulation Based on Depressurizing Mechanism,”Korean J. Chem. Eng.,17, 344 (2000).

    Article  CAS  Google Scholar 

  12. Tsutsumi, A., Chen, W. and Kim, Y.H., “Classification and Characterization of Hydrodynamic and Transport Behaviors of Three-Phase Reactors,”Korean J. Chem. Eng.,16, 709 (1999).

    Article  CAS  Google Scholar 

  13. Yamashita, F., “Effect of Geometrical Parameters of Draft Tubes and Clear Liquid Height on Gas Holdup in a Bubble Column for Gas Dispersion into Tubes,”Korean J. Chem. Eng.,16, 789 (1999).

    Article  CAS  Google Scholar 

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Correspondence to Sung Hyun Kim.

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This paper is dedicated to Professor Wha Young Lee on the occasion of his retirement from Seoul National University.

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Lee, JC., Lee, KB., Chun, BH. et al. A study of the characteristics of heat transfer for an ammonia-water bubble mode absorber in absorption heat pump systems. Korean J. Chem. Eng. 19, 552–556 (2002). https://doi.org/10.1007/BF02699294

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Key words

  • Absorption Process
  • Absorption Heat Pump
  • Heat Transfer
  • Bubble Mode
  • Ammonia-Water