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Mechanism analysis and unified calculation model of exergy flow distribution in regional integrated energy system

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  • Li, Jiaxi
  • Wang, Dan
  • Jia, Hongjie
  • Lei, Yang
  • Zhou, Tianshuo
  • Guo, Ying

Abstract

A regional integrated energy system (RIES) involves many different forms of energy, which can use exergy as a measure of energy quality. Based on the multi-energy flow, this paper analyses the exergy flow distribution mechanism of the network, and puts forward a unified calculation model of the exergy flow of RIES. Firstly, the exergy flow distribution mechanism of the regional heat network is analysed. Taking the return network as the reference system, the exergy flow model of a single-layer regional heat network is established, and the equivalence rationality of the regional heat network is verified by the exergy flow balance analysis. Next, the concept of exergy-voltage is proposed based on exergy-potential difference, and the exergy flow calculation model of the equivalent region heat network is established. The relevant laws are extended to other energy links, the concepts of exergy-voltage of electric and gas distribution networks are proposed, and the exergy flow model is established. The energy station is equivalent to the exergy loss node. Based on exergy flow balance, the generalized Kirchhoff's first law of node exergy flow is proposed. Then, the concept of exergy-impedance is put forward. The exergy-circuit model and exergy flow unified calculation model of RIES are established. Lastly, the energy quality of a typical RIES in China is studied using the present method. Through the exergy flow distribution, it is expedient to determine the effective energy of the energy network and the energy quality characteristics of the entire system. This research demonstrates that the quantity and quality of energy and the overall and local energy quality may exhibit different characteristics. It is found that factors including improving energy structure, adopting reasonable network topology, selecting appropriate equipment, and operation mode for energy station may enhance the system energy quality.

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  • Li, Jiaxi & Wang, Dan & Jia, Hongjie & Lei, Yang & Zhou, Tianshuo & Guo, Ying, 2022. "Mechanism analysis and unified calculation model of exergy flow distribution in regional integrated energy system," Applied Energy, Elsevier, vol. 324(C).
    • Handle: RePEc:eee:appene:v:324:y:2022:i:c:s0306261922010157
    DOI: 10.1016/j.apenergy.2022.119725
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