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Thermodynamic performance modeling and decarbonization impact assessment of latent heat storage-integrated ventilation systems for solar-assisted air preheating

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  • Ma, Yin
  • Tao, Yao
  • Chen, Songping
  • Wang, Yong
  • Cheng, Yong
  • Tu, Jiyuan

Abstract

To enhance indoor air quality through fresh air ventilation while reducing energy consumption in air handling processes, this study proposes integrating a latent heat thermal energy storage system into fresh air systems for air preheating. Initially, numerical simulations were conducted to analyze the thermal charging-discharging performance of the storage system under low solar radiation and dynamic outdoor meteorological parameters. Results demonstrate that the thermal charging process can be completed despite limited solar irradiation duration and low radiation intensity, while achieving over 95 % heat release efficiency during nocturnal discharging process through heat transfer to outdoor air. Subsequently, the energy-saving performance of the novel fresh air system was systematically evaluated under varying meteorological conditions. Analysis reveals that daily energy-saving rates (0–22.4 %, averaging 13.7 %) correlate predominantly with daily solar irradiation over a week. A fitted empirical formula quantifying the relationship between energy-saving rates and meteorological parameters was developed. Extrapolating this model to winter-scale applications, the system demonstrates an average seasonal energy-saving rate of 13.2 %, corresponding to 79, 405 kWh electricity savings and 21.6 t carbon reductions. This research advances the utilization of low-grade renewable energy in built environments while providing feasible pathways for near-zero energy building development and dual carbon goal attainment.

Suggested Citation

  • Ma, Yin & Tao, Yao & Chen, Songping & Wang, Yong & Cheng, Yong & Tu, Jiyuan, 2025. "Thermodynamic performance modeling and decarbonization impact assessment of latent heat storage-integrated ventilation systems for solar-assisted air preheating," Energy, Elsevier, vol. 339(C).
    • Handle: RePEc:eee:energy:v:339:y:2025:i:c:s0360544225046547
    DOI: 10.1016/j.energy.2025.139012
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    References listed on IDEAS

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