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Role of phase change materials in backfilling of flat-panels ground heat exchanger

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  • Bottarelli, Michele
  • Baccega, Eleonora
  • Cesari, Silvia
  • Emmi, Giuseppe

Abstract

The behaviour of a multi-source heat pump system coupled with phase change materials (PCMs) is discussed in this manuscript, as based on selected data collected during one-year testing at the TekneHub Laboratory of the University of Ferrara (Italy), as a synergic prototype setup of two European projects: IDEAS, an H2020 project, and CLIWAX, an EFDR project. Three geothermal loops of novel shallow Flat-Panels ground heat exchangers (GHX) provide the coupling of a water-to-water heat pump with the ground, as backfilled with sand, a mixture of sand and granules with paraffins and containers filled in with hydrated salts. Furthermore, two hybrid photovoltaic panels and a dry-cooler complete the exploitable thermal sources landscape. Finally, a control unit manages all the elements for the exploitation of the different thermal sources. How the increased underground thermal energy storage is driven by PCMs has been investigated by means of specific tests, and compared with the standard case of backfilling sand. Results confirm that PCMs can compensate peak loads occurring during hard weather conditions. Good performances of the multi-source heat pump were found, with a winter coefficient of performance always higher than 5. Finally, the application of PCM in summer should be preferred in climatic zones with hot summers and cold winters, With evidence, latent heat, thermal conductivity and melting point of PCMs should be tuned accordingly to the energy requirements and the local ground thermal conditions.

Suggested Citation

  • Bottarelli, Michele & Baccega, Eleonora & Cesari, Silvia & Emmi, Giuseppe, 2022. "Role of phase change materials in backfilling of flat-panels ground heat exchanger," Renewable Energy, Elsevier, vol. 189(C), pages 1324-1336.
    • Handle: RePEc:eee:renene:v:189:y:2022:i:c:p:1324-1336
    DOI: 10.1016/j.renene.2022.03.061
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    References listed on IDEAS

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    2. Bottarelli, M. & Bortoloni, M. & Su, Y., 2019. "On the sizing of a novel Flat-Panel ground heat exchanger in coupling with a dual-source heat pump," Renewable Energy, Elsevier, vol. 142(C), pages 552-560.
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    1. Jelić, Marko & Batić, Marko & Krstić, Aleksandra & Bottarelli, Michele & Mainardi, Elena, 2023. "Comparative analysis of metaheuristic optimization approaches for multisource heat pump operation," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).
    2. Emmi, Giuseppe & Bottarelli, Michele, 2023. "Enhancement of shallow ground heat exchanger with phase change material," Renewable Energy, Elsevier, vol. 206(C), pages 828-837.

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