Cover
Vol. 9 No. 1 (2009)

Published: June 30, 2009

Pages: 84-99

Original Article

Appointing the Proper Operating Variables for Efficient Air-Cooled LiBr-Water Absorption Refrigerator

Abdulwadood Salman Shihab 1
1 Technical Institute of Basrah
History
  • Received: March 30, 2009
  • Available Online: June 30, 2009
DOI

https://doi.org/10.33971/bjes.9.1.10

Abstract

The aim of the present study is to perform analytical simulation for the single-effect LiBr- water absorption refrigerating system (ARS) in order to scan for all possibilities of operating the cycle among most available operating variables to obtain the best performance and determine what are the proper parameter needed to be changed so that the refrigerator can operate using ambient air instead of water and cooling tower accessories to dissipate the hear at the condenser and absorber. The COPs of the cycle was obtained as a function of the different temperature of the cycle and solution concentration. The performance characteristics of the cycle were examined by changing the temperature of the heating source supplied at the generator, the temperatures at the condenser, absorber, and evaporator. It can be concluded that the concept of air cooled absorption chiller is feasible with coefficient of performance of 0.43 10 0.79 depending on the evaporator temperature for any cooling capacity in some applications, where the chilled water supply temperature is not necessary to be too cold.

References

  1. Aphomratana, S., Chungpaibulpatana, Satha, "A review of absorption refrigeration Technologies", Renewable and Sustainable Energy Reviews 5 (2001) 343-372.
  2. Herold KE, Radermacher L. "Absorption heat pump", Mcch. Eng., Aug. 1989, 68-73.
  3. Gosney WB. "Principle of refrigeration". Cambridge Uni. Press, 1982.
  4. R. Fathi et S. Quaskit, "Performance of a solar LiBr-Water Absorption Refrigeration Systems". Rev. Energ. Ren: Journees de Thermique (2001) 73-78.
  5. Fredrik Setterwall, Dmitrey Glebov, Bo Wikensten, "Low Temperature Driven Absorption Chiller", Royal Institute of Technology, Stockholm, Sweden 2002.
  6. G. Grossman, M. Wilk and K.C. DeVauit. "Simulation and Performance Analysis of Triple Effect Absorption Cycles". ASHRAE Winter Meeting 1993.
  7. M. Boumaza, I.M. Mujtaba. "Thermodynamic analysis of refrigerating International Conference on Advances in Mechanical and Material Eng. 10-13 May 2005, Amman, Jordan."
  8. Kevin A. Goodheart, "Low Firing Temperature Absorption Chiller System", A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science (Mechanical Engineering) at the University of Wisconsin-Madison, December 2000.
  9. Aphornratana S. "Theoretical and experimental investigation of a combined ejector-absorption refrigerator". PhD thesis, University of Sheffield, UK, 1995.
  10. Robert A. Zogg, Michael Y. Feng and Detlef Westphalen, "Guide to Developing Air-Cooled LiBr Absorption for Combined Heat and Power Applications" U.S Department of energy April 2005.
  11. Yazaki Corporation, undated. "Yazaki Gus & Solar Air Conditioning Equipment". Cat. No. 15.3 AME, Yazaki Corporation, Tokyo, Japan.
  12. Foley, G., DeVault, R., and R. Sweetser, "The Future of Absorption Technology in America A Critical Look at the Impact of BCHP and Innovation". Advanced Building Systems 2000 conference, June 16, 2000.
  13. Kurosawa, S., Yoshida, A., and M. Ogawa, "Development of Next- Generation Gas-Fired Absorption Water Chiller-Heaters". Advanced Absorption Workshop, October 4, 1988.
  14. Keenan, F.G. Keyes, P.G. Hill and J.G. Moore, "Steam Table, Thermodynamic Properties of Water including Vapor, Liquid and Solid", John Wiley, New-York, 1969.
  15. ASHARE "Fundamentals Hand Book(SI)", 1997.
  16. McNeely LA. "Thermodynamic properties of aqueous solutions of lithium bromide". ASHRAE Trans 1979;85(2):413-34.
  17. Lenard JLY, Jeter SM, Teja AS. "Properties of lithium bromide-water solutions at high temperatures and concentrations-part IV: vapor pressure. ASHRAE Trans 1992:98:167-72."