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Energy optimization and performance analysis of a novel integrated energy system coupled with solar thermal unit and preheated organic cycle under extended following electric load strategy

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  • Zhang, Han
  • Han, Zhonghe
  • Wu, Di
  • Li, Peng
  • Li, Peng

Abstract

Integrated energy system (IES) coupled with solar thermal (ST) unit and organic Rankine cycle (ORC), namely ST-ORC-IES, plays a vital role in renewable energy and waste heat utilization. In this paper, a novel ST-ORC-IES is proposed, in which the preheated ORC with higher power output is employed and the diversified utilization of ST unit is realized. Then the extended following electric load strategy is introduced to coordinate electricity generation by considering the output fluctuation of ORC. Finally, an optimization model is constructed to achieve the maximum fossil fuel efficiency on both hourly and annual scales, and a new index is developed to evaluate cost performance. Optimization results show that ST-ORC-IES exhibits better cost performance than reference system, the fossil energy consumption is reduced by 10.89%, while the annual total cost is only increased by 0.77%. The rationale that energy time-varying optimization can improve cost performance is the significant saving of natural gas. In addition, the total electricity output of heat engine and ORC presents an upward trend with the increase of heat engine load, this mechanism enables the collaborative planning for power sources based on the simple principle of basic operation strategy. These findings can provide reference for related research.

Suggested Citation

  • Zhang, Han & Han, Zhonghe & Wu, Di & Li, Peng & Li, Peng, 2023. "Energy optimization and performance analysis of a novel integrated energy system coupled with solar thermal unit and preheated organic cycle under extended following electric load strategy," Energy, Elsevier, vol. 272(C).
    • Handle: RePEc:eee:energy:v:272:y:2023:i:c:s0360544223004887
    DOI: 10.1016/j.energy.2023.127094
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