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Ultra-low temperature district heating system with central heat pump and local boosters for low-heat-density area: Analyses on a real case in Denmark

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  • Yang, Xiaochen
  • Svendsen, Svend

Abstract

Low temperature district heating (DH) system gives easier access to the renewable energy as heat sources and improves the heat distribution efficiency. From the exergy point of view, low DH supply temperature also better matches the exergy demand of space heating and domestic hot water. It is more beneficial to operate district heating system under lower temperature level for the heat-sparse area where the distribution losses accounts for a large proportion in the total heat supply. In this study, the actual performance of a case ultra-low temperature district heating (ULTDH) system in Denmark was investigated based on long-term measurements. The system combines the central heat pump and local boosters, while the impact of such configuration on the overall system performance was analysed. The energy, exergy and economy performances of the case system were compared to medium temperature district heating system (MTDH) and low-temperature district heating system (LTDH). The results show that the LTDH system without supplementary heating has the highest energy and exergy efficiency. While the ULTDH system has better performance compared to the MTDH system in energy, exergy and economy due to substantial savings from the distribution heat loss.

Suggested Citation

  • Yang, Xiaochen & Svendsen, Svend, 2018. "Ultra-low temperature district heating system with central heat pump and local boosters for low-heat-density area: Analyses on a real case in Denmark," Energy, Elsevier, vol. 159(C), pages 243-251.
    • Handle: RePEc:eee:energy:v:159:y:2018:i:c:p:243-251
    DOI: 10.1016/j.energy.2018.06.068
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    6. Meesenburg, Wiebke & Ommen, Torben & Thorsen, Jan Eric & Elmegaard, Brian, 2020. "Economic feasibility of ultra-low temperature district heating systems in newly built areas supplied by renewable energy," Energy, Elsevier, vol. 191(C).
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    11. Francesco Neirotti & Michel Noussan & Stefano Riverso & Giorgio Manganini, 2019. "Analysis of Different Strategies for Lowering the Operation Temperature in Existing District Heating Networks," Energies, MDPI, vol. 12(2), pages 1-17, January.
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    13. Kljajić, Miroslav V. & Anđelković, Aleksandar S. & Hasik, Vaclav & Munćan, Vladimir M. & Bilec, Melissa, 2020. "Shallow geothermal energy integration in district heating system: An example from Serbia," Renewable Energy, Elsevier, vol. 147(P2), pages 2791-2800.
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    16. Zhu, Tingting & Ommen, Torben & Meesenburg, Wiebke & Thorsen, Jan Eric & Elmegaard, Brian, 2021. "Steady state behavior of a booster heat pump for hot water supply in ultra-low temperature district heating network," Energy, Elsevier, vol. 237(C).
    17. Huang, Tao & Yang, Xiaochen & Svendsen, Svend, 2020. "Multi-mode control method for the existing domestic hot water storage tanks with district heating supply," Energy, Elsevier, vol. 191(C).
    18. Merlet, Yannis & Baviere, Roland & Vasset, Nicolas, 2023. "Optimal retrofit of district heating network to lower temperature levels," Energy, Elsevier, vol. 282(C).
    19. Ziemele, Jelena & Talcis, Normunds & Osis, Ugis & Dace, Elina, 2021. "A methodology for selecting a sustainable development strategy for connecting low heat density consumers to a district heating system by cascading of heat carriers," Energy, Elsevier, vol. 230(C).
    20. Guelpa, E. & Capone, M. & Sciacovelli, A. & Vasset, N. & Baviere, R. & Verda, V., 2023. "Reduction of supply temperature in existing district heating: A review of strategies and implementations," Energy, Elsevier, vol. 262(PB).
    21. Fangtian Sun & Yonghua Xie & Svend Svendsen & Lin Fu, 2020. "New Low-Temperature Central Heating System Integrated with Industrial Exhausted Heat Using Distributed Electric Compression Heat Pumps for Higher Energy Efficiency," Energies, MDPI, vol. 13(24), pages 1-17, December.

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