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Retrofitting of a solar cooling and heating plant by employing PCM storage and adjusting control strategy

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  • Huang, Li
  • Piontek, Udo
  • Zhuang, Lulu
  • Zheng, Rongyue
  • Zou, Deqiu

Abstract

A solar cooling and heating plant with a 1000 l hot water storage tank has been operated since 2018. Two main problems were observed: (1) a fluctuating operation of the absorption chiller due to a high number of stat-up and shut-down procedures; (2) high electricity consumption caused by a low solar fraction SFn of 50.9% during the cooling period. In 2021, the solar plant was retrofitted by employing a shell and tube heat exchanger based on a PCM melting at 64 °C and by adjusting the control strategy. The system performance was evaluated and compared before and after retrofitting based on the operational data in 2021 and 2022. The total number of switch-on times of the chiller shrank by 33.5% and the operation time was increased by 65% in 2022 due to the stable hot water inlet temperature. Contributing to the high heat storage capacity of the PCM storage, more solar thermal energy was utilized and the average SFn reached 75.6% during the cooling period in 2022, leading to a 24.4% reduction in the total electricity consumption compared to 2021.

Suggested Citation

  • Huang, Li & Piontek, Udo & Zhuang, Lulu & Zheng, Rongyue & Zou, Deqiu, 2024. "Retrofitting of a solar cooling and heating plant by employing PCM storage and adjusting control strategy," Applied Energy, Elsevier, vol. 368(C).
    • Handle: RePEc:eee:appene:v:368:y:2024:i:c:s0306261924008456
    DOI: 10.1016/j.apenergy.2024.123462
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    References listed on IDEAS

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    1. Li Huang & Rongyue Zheng & Udo Piontek, 2019. "Installation and Operation of a Solar Cooling and Heating System Incorporated with Air-Source Heat Pumps," Energies, MDPI, vol. 12(6), pages 1-17, March.
    2. V, Krishna Raj & V, Baiju, 2023. "Enhancing thermal performance of latent heat storage unit for solar cooling: A hybrid approach with C-shaped fins and nano-additives," Applied Energy, Elsevier, vol. 351(C).
    3. Hirmiz, R. & Lightstone, M.F. & Cotton, J.S., 2018. "Performance enhancement of solar absorption cooling systems using thermal energy storage with phase change materials," Applied Energy, Elsevier, vol. 223(C), pages 11-29.
    4. Ewelina Radomska & Lukasz Mika & Karol Sztekler, 2020. "The Impact of Additives on the Main Properties of Phase Change Materials," Energies, MDPI, vol. 13(12), pages 1-34, June.
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    Cited by:

    1. Paola Herrera & Hector De la Hoz Siegler & Matthew Clarke, 2024. "Fatty Acids as Phase Change Materials for Building Applications: Drawbacks and Future Developments," Energies, MDPI, vol. 17(19), pages 1-24, September.

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