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Thermodynamic Evaluation of LiCl-H 2 O and LiBr-H 2 O Absorption Refrigeration Systems Based on a Novel Model and Algorithm

Author

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  • Jie Ren

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

  • Zuoqin Qian

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

  • Zhimin Yao

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    Faculty of Engineering and Information Technologies, University of Technology Sydney, Sydney, NSW 2007, Australia)

  • Nianzhong Gan

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

  • Yujia Zhang

    (School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

Abstract

An absorption refrigeration system (ARS) is an alternative to the conventional mechanical compression system for cold production. This study developed a novel calculation model using the Matlab language for the thermodynamic analysis of ARS. It was found to be reliable in LiCl-H 2 O and LiBr-H 2 O ARS simulations and the parametric study was performed in detail. Moreover, two 50 kW water-cooled single effect absorption chillers were simply designed to analyze their off-design behaviors. The results indicate that LiCl-H 2 O ARS had a higher coefficient of performance ( COP ) and exergetic efficiency, particularly in the lower generator or higher condenser temperature conditions, but it operated more restrictively due to crystallization. The off-design analyses revealed that the preponderant performance of LiCl-H 2 O ARS was mainly due to its better solution properties because the temperature of each component was almost the same for both chillers in the operation. The optimum inlet temperature of hot water for LiCl-H 2 O (83 °C) was lower than that of LiBr-H 2 O (98 °C). The cooling water inlet temperature should be controlled within 41 °C, otherwise the performances are discounted heavily. The COP and cooling capacity could be improved by increasing the temperature of hot water or chilled water properly, contrary to the exergetic efficiency.

Suggested Citation

  • Jie Ren & Zuoqin Qian & Zhimin Yao & Nianzhong Gan & Yujia Zhang, 2019. "Thermodynamic Evaluation of LiCl-H 2 O and LiBr-H 2 O Absorption Refrigeration Systems Based on a Novel Model and Algorithm," Energies, MDPI, vol. 12(15), pages 1-28, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:15:p:3037-:d:255293
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    References listed on IDEAS

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    Cited by:

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