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Performance optimization of a solar adsorption chiller by dynamically adjusting the half-cycle time

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  • Basdanis, Thanasis
  • Tsimpoukis, Alexandros
  • Valougeorgis, Dimitris

Abstract

The half-cycle time effect on the performance of a solar single-stage dual-bed adsorption chiller, in Athens, Greece, in July, is investigated. The adsorption chiller coupled with the solar system is simulated, in real time, during the day for a) constant and b) adjusted half-cycle times and the system performance is monitored. In the former case, the half-cycle time is fixed, while in the latter one is dynamically adjusted according to the varying solar radiation intensity. Using a wide range of constant half-cycle times it is found that the maximum daily cooling capacity is obtained at some constant half-cycle time, which is larger than the optimum one of a single adsorption cycle. Similarly, using a wide range of adjusted half-cycle times, the one, providing the maximum cooling capacity is defined. The analysis is performed in a systematic manner through a proposed algebraic expression. It is found that the dynamically optimized adjusted half-cycle time operation mode provides about 12% higher daily and monthly cooling capacities than the corresponding maximum constant ones. This significant increase has been also confirmed for various incident solar radiation intensities.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:164:y:2021:i:c:p:362-374
    DOI: 10.1016/j.renene.2020.09.072
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    2. Karol Sztekler & Wojciech Kalawa & Łukasz Mika & Marcin Sowa, 2021. "Effect of Metal Additives in the Bed on the Performance Parameters of an Adsorption Chiller with Desalination Function," Energies, MDPI, vol. 14(21), pages 1-27, November.
    3. Abdullah Ahmed Bawazir & Daniel Friedrich, 2022. "Evaluation and Design of Large-Scale Solar Adsorption Cooling Systems Based on Energetic, Economic and Environmental Performance," Energies, MDPI, vol. 15(6), pages 1-24, March.
    4. Pan, Q.W. & Xu, J. & Ge, T.S. & Wang, R.Z., 2022. "Multi-mode integrated system of adsorption refrigeration using desiccant coated heat exchangers for ultra-low grade heat utilization," Energy, Elsevier, vol. 238(PB).
    5. Pan, Q.W. & Xu, J. & Wang, R.Z. & Ge, T.S., 2022. "A new operation strategy based on unequal ad-/desorption time for a two-bed adsorption refrigeration system," Energy, Elsevier, vol. 259(C).

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