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Enhanced performance and stability of a solar pond using an external heat exchanger filled with nano-phase change material

Author

Listed:
  • Farsijani, Ehsan
  • Shafizadeh, Alireza
  • Mobli, Hossein
  • Akbarzadeh, Aliakbar
  • Tabatabaei, Meisam
  • Peng, Wanxi
  • Aghbashlo, Mortaza

Abstract

Salinity gradient solar ponds are a promising technology for harnessing/storing solar thermal energy. The energy storage capacity of solar ponds can be enhanced by incorporating phase change materials (PCMs). However, the low thermal conductivity of PCMs can negatively affect energy charging/discharging rates. In this study, an external energy storage system filled with CuO nanoparticle-enhanced PCM was employed to improve the performance and stability of a solar pond. The results were compared with water and pure PCM (paraffin) as control materials. Energy and exergy analysis was used to assess the effects of nanoparticles and their concentration on the overall solar pond performance. According to the results, the upper convective zone temperature remained consistent across all experiments and varied within the same range throughout the day. A slight temperature variation at specific times indicated the stability of the developed solar pond system. The system's exergy (energy) efficiency was increased from 10.72% (51.83%) for water to 14.71% (70.1%), 22.77% (82.13%), and 25.93% (87.58%) for PCM, PCM with 1 wt% nanoparticles, and PCM with 2 wt% nanoparticles, respectively. Incorporating nanoparticle-enhanced PCMs in external heat exchangers can effectively improve the stability and performance of solar pond systems.

Suggested Citation

  • Farsijani, Ehsan & Shafizadeh, Alireza & Mobli, Hossein & Akbarzadeh, Aliakbar & Tabatabaei, Meisam & Peng, Wanxi & Aghbashlo, Mortaza, 2024. "Enhanced performance and stability of a solar pond using an external heat exchanger filled with nano-phase change material," Energy, Elsevier, vol. 292(C).
    • Handle: RePEc:eee:energy:v:292:y:2024:i:c:s0360544224001944
    DOI: 10.1016/j.energy.2024.130423
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    References listed on IDEAS

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