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Performance improvement of a butane/octane absorption chiller

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  • Chekir, Nihel
  • Bellagi, Ahmed

Abstract

To improve the coefficient of performance (COP) of an absorption chiller working with the n-butane as refrigerant and the n-octane as absorbent, a thermodynamic analysis based on the first and the second law of thermodynamic is required. A simulation model is established to calculate the different thermodynamic properties of each point of the cycle such as compositions, flow rates, and temperatures. Heat transfer rates and some performance parameters are calculated using the first law analysis. Compared to an ideal machine, the performances are degraded because of the irreversibilities occurring in the different components of the machine. The second law analysis provides the entropy generation in each element and its contribution at the degradation of the COP as well as the total entropy generation of the system. We have proposed a modification of the initial configuration of the machine to reduce the energy losses occurring in the components of high entropy generation and to improve the performance. This recuperation increases the COP from 0.36 to 0.59 and the efficiency from 0.24 to 0.39.

Suggested Citation

  • Chekir, Nihel & Bellagi, Ahmed, 2011. "Performance improvement of a butane/octane absorption chiller," Energy, Elsevier, vol. 36(10), pages 6278-6284.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:10:p:6278-6284
    DOI: 10.1016/j.energy.2011.07.001
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    References listed on IDEAS

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    1. Kilic, Muhsin & Kaynakli, Omer, 2007. "Second law-based thermodynamic analysis of water-lithium bromide absorption refrigeration system," Energy, Elsevier, vol. 32(8), pages 1505-1512.
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    Cited by:

    1. Usón, Sergio & Kostowski, Wojciech J. & Stanek, Wojciech & Gazda, Wiesław, 2015. "Thermoecological cost of electricity, heat and cold generated in a trigeneration module fuelled with selected fossil and renewable fuels," Energy, Elsevier, vol. 92(P3), pages 308-319.
    2. Mahian, Omid & Mahmud, Shohel & Heris, Saeed Zeinali, 2012. "Analysis of entropy generation between co-rotating cylinders using nanofluids," Energy, Elsevier, vol. 44(1), pages 438-446.
    3. Stanek, Wojciech & Gazda, Wiesław & Kostowski, Wojciech, 2015. "Thermo-ecological assessment of CCHP (combined cold-heat-and-power) plant supported with renewable energy," Energy, Elsevier, vol. 92(P3), pages 279-289.
    4. Wonchala, Jason & Hazledine, Maxwell & Goni Boulama, Kiari, 2014. "Solution procedure and performance evaluation for a water–LiBr absorption refrigeration machine," Energy, Elsevier, vol. 65(C), pages 272-284.
    5. Gong, Sunyoung & Goni Boulama, Kiari, 2014. "Parametric study of an absorption refrigeration machine using advanced exergy analysis," Energy, Elsevier, vol. 76(C), pages 453-467.

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