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The first and second law analysis of a lithium bromide/water coil absorber

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  • Kaynakli, O.

Abstract

The aim of this paper is to study the irreversibilities in a coil absorber using lithium bromide solution and to determine the variation of the second law efficiency with some variables such as cooling water flow rate, solution flow rate, cooling water temperature and solution concentration. The influence of absorber performance parameters is examined on the basis of the first and second laws of thermodynamics for parallel and counter-current types. In this regard, the heat and mass transfer, the second law efficiency, the magnitude and place of exergy losses in two types of absorbers are estimated and discussed comprehensively. The results showed that increasing the cooling water flow rate and decreasing the cooling water inlet temperature increase the heat and mass transfer, and decrease the second law efficiency. The effect of the solution concentration on the efficiency in general is small. Whereas the irreversibility for the counter-current mode is greater than that of the parallel-current mode, the heat-mass transfer 3–19% and the second law efficiency 1–12% are higher.

Suggested Citation

  • Kaynakli, O., 2008. "The first and second law analysis of a lithium bromide/water coil absorber," Energy, Elsevier, vol. 33(5), pages 804-816.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:5:p:804-816
    DOI: 10.1016/j.energy.2008.01.009
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    1. Srikhirin, Pongsid & Aphornratana, Satha & Chungpaibulpatana, Supachart, 2001. "A review of absorption refrigeration technologies," Renewable and Sustainable Energy Reviews, Elsevier, vol. 5(4), pages 343-372, December.
    2. Etemoglu, A.B. & Can, M., 2007. "Classification of geothermal resources in Turkey by exergy analysis," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(7), pages 1596-1606, September.
    3. Şencan, Arzu & Yakut, Kemal A. & Kalogirou, Soteris A., 2005. "Exergy analysis of lithium bromide/water absorption systems," Renewable Energy, Elsevier, vol. 30(5), pages 645-657.
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    1. Yılmaz, İbrahim Halil & Saka, Kenan & Kaynakli, Omer, 2016. "A thermodynamic evaluation on high pressure condenser of double effect absorption refrigeration system," Energy, Elsevier, vol. 113(C), pages 1031-1041.
    2. Mortazavi, Mehdi & Schmid, Michael & Moghaddam, Saeed, 2017. "Compact and efficient generator for low grade solar and waste heat driven absorption systems," Applied Energy, Elsevier, vol. 198(C), pages 173-179.
    3. Privat, Romain & Qian, Jun-Wei & Alonso, Dominique & Jaubert, Jean-Noël, 2013. "Quest for an efficient binary working mixture for an absorption-demixing heat transformer," Energy, Elsevier, vol. 55(C), pages 594-609.
    4. Mortazavi, Mehdi & Nasr Isfahani, Rasool & Bigham, Sajjad & Moghaddam, Saeed, 2015. "Absorption characteristics of falling film LiBr (lithium bromide) solution over a finned structure," Energy, Elsevier, vol. 87(C), pages 270-278.

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