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Evaluations of different domestic hot water preparing methods with ultra-low-temperature district heating

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  • Yang, Xiaochen
  • Li, Hongwei
  • Svendsen, Svend

Abstract

This study investigated the performances of five different substation configurations in single-family houses supplied with ULTDH (ultra-low-temperature district heating). The temperature at the heat plant is 46 °C and around 40 °C at the substations. To avoid the proliferation of Legionella in the DHW (domestic hot water) and assure the comfortable temperature, all substations were installed with supplementary heating devices. Detailed measurements were taken in the substations, including the electricity demand of the supplementary heating devices. To compare the energy and economic performance of the substations, separate models were built based on standard assumptions. The relative heat and electricity delivered for preparing DHW were calculated. The results showed that substations with storage tanks and heat pumps have high relative electricity demand, which leads to higher integrated costs considering both heat and electricity for DHW preparation. The substations with in-line electric heaters have low relative electricity usage because very little heat is lost due to the instantaneous DHW preparation. Accordingly, the substations with in-line electric heaters would have the lowest energy cost for DHW preparation. To achieve optimal design and operation for the ULTDH substation, the electricity peak loads of the in-line electric heaters were analysed according to different DHW-heating strategies.

Suggested Citation

  • Yang, Xiaochen & Li, Hongwei & Svendsen, Svend, 2016. "Evaluations of different domestic hot water preparing methods with ultra-low-temperature district heating," Energy, Elsevier, vol. 109(C), pages 248-259.
    • Handle: RePEc:eee:energy:v:109:y:2016:i:c:p:248-259
    DOI: 10.1016/j.energy.2016.04.109
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    References listed on IDEAS

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    1. Gadd, Henrik & Werner, Sven, 2014. "Achieving low return temperatures from district heating substations," Applied Energy, Elsevier, vol. 136(C), pages 59-67.
    2. Lund, Henrik & Werner, Sven & Wiltshire, Robin & Svendsen, Svend & Thorsen, Jan Eric & Hvelplund, Frede & Mathiesen, Brian Vad, 2014. "4th Generation District Heating (4GDH)," Energy, Elsevier, vol. 68(C), pages 1-11.
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    Cited by:

    1. Li, Haoran & Hou, Juan & Hong, Tianzhen & Nord, Natasa, 2022. "Distinguish between the economic optimal and lowest distribution temperatures for heat-prosumer-based district heating systems with short-term thermal energy storage," Energy, Elsevier, vol. 248(C).
    2. Østergaard, Dorte Skaarup & Smith, Kevin Michael & Tunzi, Michele & Svendsen, Svend, 2022. "Low-temperature operation of heating systems to enable 4th generation district heating: A review," Energy, Elsevier, vol. 248(C).
    3. Marco Pellegrini & Augusto Bianchini, 2018. "The Innovative Concept of Cold District Heating Networks: A Literature Review," Energies, MDPI, vol. 11(1), pages 1-16, January.
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    5. Topal, Halil İbrahim & Tol, Hakan İbrahim & Kopaç, Mehmet & Arabkoohsar, Ahmad, 2022. "Energy, exergy and economic investigation of operating temperature impacts on district heating systems: Transition from high to low-temperature networks," Energy, Elsevier, vol. 251(C).
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    7. Michele Tunzi & Matthieu Ruysschaert & Svend Svendsen & Kevin Michael Smith, 2020. "Double Loop Network for Combined Heating and Cooling in Low Heat Density Areas," Energies, MDPI, vol. 13(22), pages 1-24, November.
    8. Østergaard, Poul Alberg & Andersen, Anders N., 2018. "Economic feasibility of booster heat pumps in heat pump-based district heating systems," Energy, Elsevier, vol. 155(C), pages 921-929.
    9. Dudkiewicz, Edyta & Fidorów-Kaprawy, Natalia, 2017. "The energy analysis of a hybrid hot tap water preparation system based on renewable and waste sources," Energy, Elsevier, vol. 127(C), pages 198-208.
    10. 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.
    11. Lund, Henrik & Østergaard, Poul Alberg & Chang, Miguel & Werner, Sven & Svendsen, Svend & Sorknæs, Peter & Thorsen, Jan Eric & Hvelplund, Frede & Mortensen, Bent Ole Gram & Mathiesen, Brian Vad & Boje, 2018. "The status of 4th generation district heating: Research and results," Energy, Elsevier, vol. 164(C), pages 147-159.
    12. Thorsen, Jan Eric & Gudmundsson, Oddgeir & Tunzi, Michele & Esbensen, Torben, 2024. "Aftercooling concept: An innovative substation ready for 4th generation district heating networks," Energy, Elsevier, vol. 293(C).
    13. Lund, Henrik & Østergaard, Poul Alberg & Nielsen, Tore Bach & Werner, Sven & Thorsen, Jan Eric & Gudmundsson, Oddgeir & Arabkoohsar, Ahmad & Mathiesen, Brian Vad, 2021. "Perspectives on fourth and fifth generation district heating," Energy, Elsevier, vol. 227(C).
    14. Ashfaq, Asad & Ianakiev, Anton, 2018. "Investigation of hydraulic imbalance for converting existing boiler based buildings to low temperature district heating," Energy, Elsevier, vol. 160(C), pages 200-212.
    15. Brange, Lisa & Lauenburg, Patrick & Sernhed, Kerstin & Thern, Marcus, 2017. "Bottlenecks in district heating networks and how to eliminate them – A simulation and cost study," Energy, Elsevier, vol. 137(C), pages 607-616.
    16. Toffanin, Riccardo & Curti, Vinicio & Barbato, Maurizio C., 2021. "Impact of Legionella regulation on a 4th generation district heating substation energy use and cost: the case of a Swiss single-family household," Energy, Elsevier, vol. 228(C).
    17. Cai, Hanmin & Ziras, Charalampos & You, Shi & Li, Rongling & Honoré, Kristian & Bindner, Henrik W., 2018. "Demand side management in urban district heating networks," Applied Energy, Elsevier, vol. 230(C), pages 506-518.
    18. Vivian, Jacopo & Emmi, Giuseppe & Zarrella, Angelo & Jobard, Xavier & Pietruschka, Dirk & De Carli, Michele, 2018. "Evaluating the cost of heat for end users in ultra low temperature district heating networks with booster heat pumps," Energy, Elsevier, vol. 153(C), pages 788-800.

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