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Diagnostic Protocol for Thermal Performance of District Heating Pipes in Operation. Part 2: Estimation of Present Thermal Conductivity in Aged Pipe Insulation

Author

Listed:
  • Peter Lidén

    (Department of Architecture and Civil Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden)

  • Bijan Adl-Zarrabi

    (Department of Architecture and Civil Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden)

  • Carl-Eric Hagentoft

    (Department of Architecture and Civil Engineering, Chalmers University of Technology, 412 96 Gothenburg, Sweden)

Abstract

Buried and operating district heating (DH) pipes are exposed to thermal degradation of their polyurethane (PUR) insulation over time, and their status is hard to assess without excavation. By using DH pipe valves in manholes as measurement points during a shutdown with an ensuing cooling period, non-destructive assessments can be performed. This study compares new improved field measurements with numerical simulations of the temperature decline in drainage valves and shutdown valves. The drainage valve measurements were used to thermally assess part of a buried DH network. Results indicate that by using the drainage valves as measurement points in a cooling method, the thermal conductivity of the buried DH network could be predicted with an accuracy of >95%. In addition, a general diagnostic protocol has been established for assessing the thermal status of a DH network, ready for network owners to use.

Suggested Citation

  • Peter Lidén & Bijan Adl-Zarrabi & Carl-Eric Hagentoft, 2021. "Diagnostic Protocol for Thermal Performance of District Heating Pipes in Operation. Part 2: Estimation of Present Thermal Conductivity in Aged Pipe Insulation," Energies, MDPI, vol. 14(17), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5302-:d:622481
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    References listed on IDEAS

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    1. Stanislav Chicherin & Vladislav Mašatin & Andres Siirde & Anna Volkova, 2020. "Method for Assessing Heat Loss in A District Heating Network with A Focus on the State of Insulation and Actual Demand for Useful Energy," Energies, MDPI, vol. 13(17), pages 1-15, September.
    2. Danielewicz, J. & Śniechowska, B. & Sayegh, M.A. & Fidorów, N. & Jouhara, H., 2016. "Three-dimensional numerical model of heat losses from district heating network pre-insulated pipes buried in the ground," Energy, Elsevier, vol. 108(C), pages 172-184.
    3. Peter Lidén & Bijan Adl-Zarrabi & Carl-Eric Hagentoft, 2021. "Diagnostic Protocol for Thermal Performance of District Heating Pipes in Operation. Part 1: Estimation of Supply Pipe Temperature by Measuring Temperature at Valves after Shutdown," Energies, MDPI, vol. 14(16), pages 1-15, August.
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    Cited by:

    1. Yuri Vankov & Elvira Bazukova & Dmitry Emelyanov & Alexander Fedyukhin & Olga Afanaseva & Irina Akhmetova & Umberto Berardi, 2022. "Experimental Assessment of the Thermal Conductivity of Basalt Fibres at High Temperatures," Energies, MDPI, vol. 15(8), pages 1-11, April.
    2. Fester, Jakob & Østergaard, Peter Friis & Bentsen, Fredrik & Nielsen, Brian Kongsgaard, 2023. "A data-driven method for heat loss estimation from district heating service pipes using heat meter- and GIS data," Energy, Elsevier, vol. 277(C).
    3. Jing, Mengke & Zhang, Shujie & Fu, Lisong & Cao, Guoquan & Wang, Rui, 2023. "Reducing heat losses from aging district heating pipes by using cured-in-place pipe liners," Energy, Elsevier, vol. 273(C).
    4. Silvia Ravelli, 2022. "District Heating and Cooling towards Net Zero," Energies, MDPI, vol. 15(16), pages 1-2, August.
    5. Manservigi, Lucrezia & Bahlawan, Hilal & Losi, Enzo & Morini, Mirko & Spina, Pier Ruggero & Venturini, Mauro, 2022. "A diagnostic approach for fault detection and identification in district heating networks," Energy, Elsevier, vol. 251(C).

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