R. Palacios BERECHE, R. Gonzales PALOMİNO, Silvia NEBRA

Thermoeconomic Analysis of a Single and Double-Effect LiBr/H2O Absorption Refrigeration System

The aim of this work is to carry out a thermoeconomic analysis of a single and double-effect LiBr/H2O absorption refrigeration system. The methodology of functional analysis with negentropy is used. The exergetic cost of the main product, the cooling cost, was calculated as a function of the exergy of the heat source. Two cases were analyzed for each system: the first considers a direct-fired system while the second considers a hot-water driven system for the single-effect system and a steam-driven system for the double effect system as part of a cogeneration system. As expected, the resultant exergetic cost of the main product was higher for the direct-fired system.This paper is an updated version of a paper published in the ECOS'08 proceedings.

Keywords:

absorption refrigeration exergy, thermoeconomic evaluation, lithium bromide,

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Accadia M. D., Rossi F., 1998, “Thermoeconomic optimization of a refrigeration plant”. Int J. Refrig, Vol. 21, No. 1, pp. 42 – 54.
Alves L., 2007, Exergoeconomic Analysis/ Optimization of different production process of hydrogen from natural gás, PhD Thesis, Fac. Of Mechanical Engineering, State University of Campinas, Campinas, SP, Brazil, (in Portuguese).
ASHRAE, 2002, ASHRAE Handbook 2002: Refrigeration, Atlanta, pp. 41.3 – 41.4.
Bejan A., Tsatsaronis G., Moran M., 1996, Thermal design and optimization, John Wiley &Sons Inc. United States.
Cerqueira S., 1999, Methodologies of Thermoeconomic Analysis of Systems, PhD Thesis, Fac. Of Mechanical Engineering, State University of Campinas, SP, Brazil (in Portuguese).
Dorgan Ch. B., Leight S. P.; Dorgan Ch. E., 1995, Application guide for absorption cooling/refrigeration using recovered heat, ASHRAE Atlanta.
Frangopoulos, C. A., 1983, Thermoeconomic Functional Analysis: A method for Optimal Design or Improvement of Complex Thermal Systems. Tese PhD, Georgia Institute of Technology, Atlanta.
Frangopoulos, C. A., 1987, “Thermo-economic Functional analysis and optimization”. Energy, Vol. 12, No. 7, pp. 563-571.
Gonzales R., Nebra S. A., 2004, “Energetic, exergetic and exergetic cost analysis for a cogeneration system integrated by an internal combustion engine, HRSG and an absorption refrigeration system”, Proceedings of ESDA04 7th Biennial ASME Conference Engineering Systems Design and Analysis, Manchester, United Kingdom July 19-22.
Gonzáles R., 2004, Cogeneration from natural gas: A politic, economic, energetic, exergetic and thermoeconomic approach, Campinas,: Faculty of Mechanical Engineering, State University of Campinas, SP, Brazil (in Portuguese).
Gonzáles R., Nebra S. A., 2005, “Thermoeconomic Analysis Of A Cogeneration System Applied To A University Hospital”,
Trondheim, Norway, June 20–22, 2005, p. 485 – 494.
Proceedings of ECOS 2005, Herold K. E., Radermacher R., Klein S. A., 1996, Absorption chillers and heat pumps, Estados Unidos, CRC Press LLC, 329p.
Lozano M. A., Valero A., 1993, “Theory of the exergetic cost”, Energy, Vol. 18, No. 9, pp. 939-960.
Misra, R.D.; Sahoo P. K., Gupta A., 2002, “Application of the exergetic cost theory to the H2O/LiBr vapour – absorption system”; Energy, 27, p. 1009 – 1025. Misra, “Thermoeconomic
H2O/LiBr vapour – absorption refrigeration system using the exergetic cost theory”. Proceedings of ECOS 2005, Trondheim, Norway, June 20-22, pp. 477 – 484.
, double-effect Modesto M., 2004, Repowering in Power Generating System in Steel Mills Using Themoeconomic Analysis, Campinas, Faculty of Mechanical Engineering, State University of Campinas, 248p., PhD Thesis.
New Buildings Institute, 1998, “Absorption Chillers”, Advanced Desingn Gudeline Series, Sacramento, Available in: www.newbuildings.org. Accessed: March 26, 2009.
Palacios – Bereche, Reynaldo; Gonzales – Palomino, Raşl; Nebra, Silvia Azucena; 2007a, “Exergy calculation of lithium bromide – water solution (LiBr – H2O)” ; Proceedings of the 20th International Conference on Efficiency,
Environmental Impact of Energy Systems - ECOS 2007, Padova, Italy, June 25-28, Vol. 1, pp. 407-414.
and Palacios – Bereche, Reynaldo; Gonzales – Palomino, Raşl; Nebra, Silvia Azucena; 2007b, “Exergetic analysis of a single and double effect LiBr/H2O absorption refrigeration system considering the physical and chemical exergy of the LiBr/H2O solution”, Proceedings of the 20th International Conference on Efficiency, Costs, Optimization, Simulation and Environmental Impact of Energy Systems - ECOS 2007, Padova, Italy, June 25-28, Vol. 1, pp. 415 – 422.
Srikhirin P., Aphornratana S., Chungpaibulpatana S., 2001, “A review of absorption refrigeration technologies”, Renewable and Sustainable Energy Reviews, No. 5, pp. 343-372.
Tsatsaronis G., 1993, “Thermoeconomic analysis and optimization of energy systems”, Progress in Energy and Combustion Science, Vol. 19, No. 3, pp. 227 – 257.
Wark K., 1995, Advanced Thermodynamics for Engineers. Singapore: McGraw-Hill International Editions, p. 564.