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Evaluation of the intermittent performance of heating terminals based on exergy analysis: Discriminate the impacts of heat and electricity input

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  • Sun, Hongli
  • Duan, Mengfan
  • Yang, Zixu
  • Ding, Pei
  • Wu, Yifan
  • Lin, Borong

Abstract

Intermittent space heating is widely recommended for building energy conservation. Although various heating terminals have been developed, the performance improvement for intermittent heating is still worth evaluating to maximize the energy-saving potential. Currently, energy-based and entransy-based methods are commonly applied for performance analysis, but these methods cannot reflect the comprehensive utilization efficiency of various energy forms. Therefore, this work conducts a discrimination study on the intermittent energy utilization of different heating terminals based on an exergy-based evaluation method. Specifically, this study analyzes the intermittent exergy flow performance of the “heating source-terminal-indoor environment” process. Moreover, we compare how various energy forms impact performance improvement aiming to recognize the potential of different optimization strategies from the aspect of heat and electricity exergy. Furthermore, the holistic performance of heating terminals under different heating source plants is evaluated to support practical applications. The experimental results suggest that the convective terminals attained the best intermittent performance and that the exergy efficiency of the fan coil is the highest (32.9%), with a greater improvement achieved by raising the fan power and connecting the fan coil to the heat pump system. This study provides a novel aspect of analyzing heating performance and optimization path of heating systems.

Suggested Citation

  • Sun, Hongli & Duan, Mengfan & Yang, Zixu & Ding, Pei & Wu, Yifan & Lin, Borong, 2023. "Evaluation of the intermittent performance of heating terminals based on exergy analysis: Discriminate the impacts of heat and electricity input," Applied Energy, Elsevier, vol. 346(C).
    • Handle: RePEc:eee:appene:v:346:y:2023:i:c:s0306261923006955
    DOI: 10.1016/j.apenergy.2023.121331
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