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Design of serially connected district heating heat pumps utilising a geothermal heat source

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  • Jensen, Jonas K.
  • Ommen, Torben
  • Markussen, Wiebke B.
  • Elmegaard, Brian

Abstract

The design of two heat pumps (HP), connected in series, was investigated for operation in the district heating (DH) network of the Greater Copenhagen area, Denmark. The installation was dimensioned to supply 7.2 MW of heat at a temperature of 85 °C. The heat pumps utilise a geothermal heat source at 73 °C. Both heat source and sink experience a large temperature change, which may lead to decreased performance for single vapour compression HP. The performance may be increased by using HPs connected in series and by applying HPs with zeotropic mixtures. First a generic study with a simple representation of the HP was applied to investigate optimal system configurations. It was shown that using two heat pumps in series with direct heat exchange in parallel with the first heat pump could increase the performance compared to the HP performance. Detailed thermodynamic models of a zeotropic mixture HP predicted that an exergetic efficiency of the units between 50% and 65% is possible. The technical feasibility as well as the economic viability of this installation was investigated for a range of optimal configurations. The analysis recommends a heat pump configuration with a system exergetic efficiency of 63%.

Suggested Citation

  • Jensen, Jonas K. & Ommen, Torben & Markussen, Wiebke B. & Elmegaard, Brian, 2017. "Design of serially connected district heating heat pumps utilising a geothermal heat source," Energy, Elsevier, vol. 137(C), pages 865-877.
    • Handle: RePEc:eee:energy:v:137:y:2017:i:c:p:865-877
    DOI: 10.1016/j.energy.2017.03.164
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    References listed on IDEAS

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    4. 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.
    5. Rämä, Miika & Wahlroos, Mikko, 2018. "Introduction of new decentralised renewable heat supply in an existing district heating system," Energy, Elsevier, vol. 154(C), pages 68-79.
    6. Pieper, Henrik & Ommen, Torben & Elmegaard, Brian & Brix Markussen, Wiebke, 2019. "Assessment of a combination of three heat sources for heat pumps to supply district heating," Energy, Elsevier, vol. 176(C), pages 156-170.
    7. Wang, Xiaoyin & Zhao, Xiling & Fu, Lin, 2018. "Entransy analysis of secondary network flow distribution in absorption heat exchanger," Energy, Elsevier, vol. 147(C), pages 428-439.
    8. Walch, Alina & Li, Xiang & Chambers, Jonathan & Mohajeri, Nahid & Yilmaz, Selin & Patel, Martin & Scartezzini, Jean-Louis, 2022. "Shallow geothermal energy potential for heating and cooling of buildings with regeneration under climate change scenarios," Energy, Elsevier, vol. 244(PB).
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    10. Seo, Youngguk & Seo, Un-Jong, 2021. "Ground source heat pump (GSHP) systems for horticulture greenhouses adjacent to highway interchanges: A case study in South Korea," Renewable and Sustainable Energy Reviews, Elsevier, vol. 135(C).
    11. Verena Weiler & Jonas Stave & Ursula Eicker, 2019. "Renewable Energy Generation Scenarios Using 3D Urban Modeling Tools—Methodology for Heat Pump and Co-Generation Systems with Case Study Application †," Energies, MDPI, vol. 12(3), pages 1-19, January.
    12. Meesenburg, Wiebke & Ommen, Torben & Elmegaard, Brian, 2018. "Dynamic exergoeconomic analysis of a heat pump system used for ancillary services in an integrated energy system," Energy, Elsevier, vol. 152(C), pages 154-165.
    13. Pieper, Henrik & Krupenski, Igor & Brix Markussen, Wiebke & Ommen, Torben & Siirde, Andres & Volkova, Anna, 2021. "Method of linear approximation of COP for heat pumps and chillers based on thermodynamic modelling and off-design operation," Energy, Elsevier, vol. 230(C).
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    15. Pieper, Henrik & Ommen, Torben & Kjær Jensen, Jonas & Elmegaard, Brian & Brix Markussen, Wiebke, 2020. "Comparison of COP estimation methods for large-scale heat pumps used in energy planning," Energy, Elsevier, vol. 205(C).

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