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Dynamic optimization of adsorptive chillers: The “AQSOA™-FAM-Z02 – Water” working pair

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  • Girnik, Ilya S.
  • Aristov, Yuri I.

Abstract

Despite significant progress in commercial ACs (adsorption chillers) achieved for the last thirty years, still there is a much room for their further improvement. This paper addresses the optimization of dynamic performance of ACs utilizing loose grains of a novel adsorbent AQSOA™-FAM-Z02. The dynamic data were measured by a Volumetric Large Temperature Jump method under typical conditions of isobaric ad/desorption stages of real AC cycle. For the first time, the effects of number of the adsorbent layers (N = 2, 4, and 8), grain size (0.2–0.9 mm) and cycle boundary conditions were comprehensively studied. The most notable findings revealed for the water ad/desorption dynamics are: 1) the initial part of all kinetic curves is exponential and can be described by a single characteristic time τ; 2) at equal values of the ratio (S/m)=(heat transfer surface)/(adsorbent mass), the dynamic curves are very close regardless the adsorbent grain size R (the “grain size insensitive” regime is observed at 0.44 m2/kg ≤ (S/m) ≤ 1.75 m2/kg); 3) the maximal specific cooling power is a linear function of the (S/m)-ratio. Appropriate recommendations on improving the AC cycle dynamics which concern the optimal conversion degree, grain size and (S/m)-ratio are made.

Suggested Citation

  • Girnik, Ilya S. & Aristov, Yuri I., 2016. "Dynamic optimization of adsorptive chillers: The “AQSOA™-FAM-Z02 – Water” working pair," Energy, Elsevier, vol. 106(C), pages 13-22.
    • Handle: RePEc:eee:energy:v:106:y:2016:i:c:p:13-22
    DOI: 10.1016/j.energy.2016.03.036
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    References listed on IDEAS

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    Cited by:

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    3. Gediz Ilis, Gamze, 2017. "Influence of new adsorbents with isotherm Type V on performance of an adsorption heat pump," Energy, Elsevier, vol. 119(C), pages 86-93.
    4. Tokarev, M.M. & Aristov, Yu.I., 2017. "A new version of the Large Temperature Jump method: The thermal response (T–LTJ)," Energy, Elsevier, vol. 140(P1), pages 481-487.
    5. Girnik, Ilya S. & Aristov, Yuri I., 2016. "Dynamics of water vapour adsorption by a monolayer of loose AQSOA™-FAM-Z02 grains: Indication of inseparably coupled heat and mass transfer," Energy, Elsevier, vol. 114(C), pages 767-773.
    6. Frangopoulos, Christos A., 2018. "Recent developments and trends in optimization of energy systems," Energy, Elsevier, vol. 164(C), pages 1011-1020.
    7. Grekova, A.D. & Girnik, I.S. & Nikulin, V.V. & Tokarev, M.M. & Gordeeva, L.G. & Aristov, Yu.I., 2016. "New composite sorbents of water and methanol “salt in anodic alumina”: Evaluation for adsorption heat transformation," Energy, Elsevier, vol. 106(C), pages 231-239.
    8. Palomba, Valeria & Sapienza, Alessio & Aristov, Yuri, 2019. "Dynamics and useful heat of the discharge stage of adsorptive cycles for long term thermal storage," Applied Energy, Elsevier, vol. 248(C), pages 299-309.
    9. Mohammadzadeh Kowsari, Milad & Niazmand, Hamid & Tokarev, Mikhail Mikhailovich, 2018. "Bed configuration effects on the finned flat-tube adsorption heat exchanger performance: Numerical modeling and experimental validation," Applied Energy, Elsevier, vol. 213(C), pages 540-554.
    10. Pinheiro, Joana M. & Salústio, Sérgio & Rocha, João & Valente, Anabela A. & Silva, Carlos M., 2020. "Adsorption heat pumps for heating applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    11. Piotr Boruta & Tomasz Bujok & Łukasz Mika & Karol Sztekler, 2021. "Adsorbents, Working Pairs and Coated Beds for Natural Refrigerants in Adsorption Chillers—State of the Art," Energies, MDPI, vol. 14(15), pages 1-41, August.

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