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A control strategy considering buildings’ thermal characteristics to mitigate heat supply-demand mismatches in district heating systems

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  • Sun, Chunhua
  • Yan, Hao
  • Cao, Shanshan
  • Xia, Guoqiang
  • Liu, Yanan
  • Wu, Xiangdong

Abstract

In district heating systems (DHS), periodic heat supply-demand mismatches (HSDM) exacerbate issues such as thermal imbalance and hydraulic instability. To mitigate these issues, this paper proposes a supply water temperature correction strategy for heating stations that considers building's thermal characteristics. Firstly, buildings are classified into energy-saving levels based on comprehensive thermal characteristic Bc and heat load index. Secondly, simulation models are developed for buildings with different thermal characteristics, and response of indoor temperature to supply-demand mismatch rates was analyzed. Then, after determining the regulation sequence and supply water temperature of heating stations, a balanced control strategy is formulated for HSDM conditions. Finally, the proposed strategy was applied to a practical combined heat and power system (CHPS) in severe cold regions. The results showed that the studied heating stations were classified into 4 types. After regulation of both insufficient and excessive heating conditions, the indoor temperature guarantee rate increased by over 20 %; the ranges of thermal imbalance degree and hydraulic imbalance degree were reduced by more than 0.09 and 0.22, respectively; the SD of supply water pressure and supply-return pressure difference were reduced by over 0.17 and 0.11, respectively. The strategy provides a reference for global balanced control of DHS under similar HSDM conditions.

Suggested Citation

  • Sun, Chunhua & Yan, Hao & Cao, Shanshan & Xia, Guoqiang & Liu, Yanan & Wu, Xiangdong, 2024. "A control strategy considering buildings’ thermal characteristics to mitigate heat supply-demand mismatches in district heating systems," Energy, Elsevier, vol. 307(C).
    • Handle: RePEc:eee:energy:v:307:y:2024:i:c:s0360544224024113
    DOI: 10.1016/j.energy.2024.132637
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    References listed on IDEAS

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