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A novel approach to determine optimum switching frequency of a conventional adsorption chiller

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  • Alam, K.C.A.
  • Kang, Y.T.
  • Saha, B.B.
  • Akisawa, A.
  • Kashiwagi, T.

Abstract

This article investigates the effect of design parameters on the switching frequency of a conventional adsorption chiller with silica gel as adsorbent and water as adsorbate. It is well known that as the cycle time lengthens, the coefficient of performance (COP) rises but the cooling capacity lowers. Optimum cycle time is dependendent on the requirements of COP and cooling capacity. A novel simulation technique that introduces a profit function is employed to determine the optimum switching frequency of an adsorption refrigeration system. The results show that optimum switching frequency is very sensitive to the heat exchanger’s design parameters. The design parameters are characterized by the number of transfer unit, NTU, the Biot number of adsorbent bed, Bi, the aspect ratio, AR, the ratio of the heat exchanger thickness to the radius of the fluid channel Hr, the fluid alpha number, αf-a and the inert material alpha number, αm-a. The optimum switching frequency increases with the increase of NTU, Hr and with the decrease of Bi, AR, αm-a and αf-a.

Suggested Citation

  • Alam, K.C.A. & Kang, Y.T. & Saha, B.B. & Akisawa, A. & Kashiwagi, T., 2003. "A novel approach to determine optimum switching frequency of a conventional adsorption chiller," Energy, Elsevier, vol. 28(10), pages 1021-1037.
    • Handle: RePEc:eee:energy:v:28:y:2003:i:10:p:1021-1037
    DOI: 10.1016/S0360-5442(03)00064-1
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    References listed on IDEAS

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    1. Hajji, A. & Worek, W.M., 1991. "Simulation of a regenerative, closed-cycle adsorption cooling/heating system," Energy, Elsevier, vol. 16(3), pages 643-654.
    2. Saha, Bidyut B. & Boelman, Elisa C. & Kashiwagi, Takao, 1995. "Computational analysis of an advanced adsorption-refrigeration cycle," Energy, Elsevier, vol. 20(10), pages 983-994.
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    2. Basdanis, Thanasis & Tsimpoukis, Alexandros & Valougeorgis, Dimitris, 2021. "Performance optimization of a solar adsorption chiller by dynamically adjusting the half-cycle time," Renewable Energy, Elsevier, vol. 164(C), pages 362-374.
    3. Maciej Chorowski & Piotr Pyrka & Zbigniew Rogala & Piotr Czupryński, 2019. "Experimental Study of Performance Improvement of 3-Bed and 2-Evaporator Adsorption Chiller by Control Optimization," Energies, MDPI, vol. 12(20), pages 1-17, October.
    4. Wang, Dechang & Zhang, Jipeng & Tian, Xiaoliang & Liu, Dawei & Sumathy, K., 2014. "Progress in silica gel–water adsorption refrigeration technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 85-104.
    5. Voyiatzis, Evangelos & Palyvos, J.A. & Markatos, Nikolaos-Christos, 2008. "Heat-exchanger design and switching-frequency effects on the performance of a continuous type solar adsorption chiller," Applied Energy, Elsevier, vol. 85(12), pages 1237-1250, December.
    6. Verde, M. & Harby, K. & de Boer, Robert & Corberán, José M., 2016. "Performance evaluation of a waste-heat driven adsorption system for automotive air-conditioning: Part I – Modeling and experimental validation," Energy, Elsevier, vol. 116(P1), pages 526-538.
    7. Verde, M. & Harby, K. & de Boer, Robert & Corberán, José M., 2016. "Performance evaluation of a waste-heat driven adsorption system for automotive air-conditioning: Part II - Performance optimization under different real driving conditions," Energy, Elsevier, vol. 115(P1), pages 996-1009.
    8. Shabir, Faizan & Sultan, Muhammad & Miyazaki, Takahiko & Saha, Bidyut B. & Askalany, Ahmed & Ali, Imran & Zhou, Yuguang & Ahmad, Riaz & Shamshiri, Redmond R., 2020. "Recent updates on the adsorption capacities of adsorbent-adsorbate pairs for heat transformation applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    9. Teng, W.S. & Leong, K.C. & Chakraborty, A., 2016. "Revisiting adsorption cooling cycle from mathematical modelling to system development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 63(C), pages 315-332.
    10. Alahmer, Ali & Ajib, Salman & Wang, Xiaolin, 2019. "Comprehensive strategies for performance improvement of adsorption air conditioning systems: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 99(C), pages 138-158.

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