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Operation strategy analysis of a geothermal step utilization heating system

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  • Zheng, Guozhong
  • Li, Feng
  • Tian, Zhe
  • Zhu, Neng
  • Li, Qianru
  • Zhu, Han

Abstract

Geothermal energy has been successfully applied in many district heating systems. In order to promote better use of geothermal energy, it is important to analyze the operation strategy of geothermal heating system. This study proposes a comprehensive and systematic operation strategy for a geothermal step utilization heating system (GSUHS). Calculation models of radiator heating system (RHS), radiant floor heating system (RFHS), heat pump (HP), gas boiler (GB), plate heat exchanger (PHE) and pump are first established. Then the operation strategy of the GSUHS is analyzed with the aim to substantially reduce the conventional energy consumption of the whole system. Finally, the energy efficiency and geothermal tail water temperature are analyzed. With the operation strategy in this study, the geothermal energy provides the main heating amount for the system. The heating seasonal performance factor is 15.93. Compared with coal-fired heating, 75.1% of the standard coal equivalent can be saved. The results provide scientific guidance for the application of an operation strategy for a geothermal step utilization heating system.

Suggested Citation

  • Zheng, Guozhong & Li, Feng & Tian, Zhe & Zhu, Neng & Li, Qianru & Zhu, Han, 2012. "Operation strategy analysis of a geothermal step utilization heating system," Energy, Elsevier, vol. 44(1), pages 458-468.
    • Handle: RePEc:eee:energy:v:44:y:2012:i:1:p:458-468
    DOI: 10.1016/j.energy.2012.06.006
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    3. Jing, Z.X. & Jiang, X.S. & Wu, Q.H. & Tang, W.H. & Hua, B., 2014. "Modelling and optimal operation of a small-scale integrated energy based district heating and cooling system," Energy, Elsevier, vol. 73(C), pages 399-415.
    4. Daokun Chong & Haizhu Zhou & Xiaoping Li & Lining Zhou & Yitong Li & Mingda An, 2023. "An Evaluation Method of Comprehensive Performance of Retrofitted CHP District Heating Systems," Energies, MDPI, vol. 16(12), pages 1-20, June.
    5. Beck, Markus & Bayer, Peter & de Paly, Michael & Hecht-Méndez, Jozsef & Zell, Andreas, 2013. "Geometric arrangement and operation mode adjustment in low-enthalpy geothermal borehole fields for heating," Energy, Elsevier, vol. 49(C), pages 434-443.
    6. Jalilinasrabady, Saeid & Palsson, Halldor & Saevarsdottir, Gudrun & Itoi, Ryuichi & Valdimarsson, Pall, 2013. "Experimental and CFD simulation of heat efficiency improvement in geothermal spas," Energy, Elsevier, vol. 56(C), pages 124-134.
    7. Jiang, X.S. & Jing, Z.X. & Li, Y.Z. & Wu, Q.H. & Tang, W.H., 2014. "Modelling and operation optimization of an integrated energy based direct district water-heating system," Energy, Elsevier, vol. 64(C), pages 375-388.
    8. Baldvinsson, Ivar & Nakata, Toshihiko, 2016. "A feasibility and performance assessment of a low temperature district heating system – A North Japanese case study," Energy, Elsevier, vol. 95(C), pages 155-174.

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