Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Determining the useful life of district heating pipes: Correlation between natural and accelerated ageing
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0001-6793-2783
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.
2020 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 175, article id 109117Article in journal (Refereed) Published
Abstract [en]

District heating (DH) systems constitute a smart and environmentally friendly solution for energy distribution in the heat sector in Europe. This technique is still expanding but already faces some issues such as status assessment of the current DH networks and the development of new generation networks for low-temperature DH. Therefore, it is essential to understand the ageing behaviour of pipes under operating conditions and to find the relevant parameters that control the degradation processes. Many factors affect the deterioration of DH pipes, especially the polyurethane foam, which makes it very complex to find a reliable prediction model. Models based on a linear Arrhenius relationship using results from high ageing temperatures seem to be incorrect. For this study, 10 pipes that have been in service for many years in Sweden and Norway were evaluated. The aim was to study the impact of natural ageing on the mechanical adhesion and chemical structure of the polyurethane foam, which affects the pipe's performance. A test method developed at the Research Institutes of Sweden (RISE), called RISE plug method, was used to study the mechanical adhesion strength. In addition, Fourier transform infrared spectroscopy was used to observe any change in the chemical structure. The results were compared with previous analyses of DH pipes exposed to accelerated ageing. This information helps to provide a better comprehension of the deterioration of the current generation of pre-insulated DH pipes and to improve the accelerated ageing methods used nowadays to predict the technical lifetime of DH pipes. Our results suggest that the lifetime of DH pipes has been underestimated when using artificial ageing at relatively high temperatures. The data collected from naturally aged pipes gave confirmatory information about their physical status compared with our laboratory tests. This study also suggests that infrared analyses could be used as an early indication of the degradation of the polyurethane foam at the interface with a steel pipe. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 175, article id 109117
Keywords [en]
Accelerated ageing, Adhesion strength, Degradation, District heating pipes, Lifetime prediction, Natural ageing, Polyurethane foam, Adhesion, Bond strength (materials), Deterioration, Forecasting, Fourier transform infrared spectroscopy, Polyurethanes, Rigid foamed plastics, Structure (composition), Temperature, Arrhenius relationship, District heating system, Natural and accelerated ageing, New Generation networks, District heating
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-44447DOI: 10.1016/j.polymdegradstab.2020.109117Scopus ID: 2-s2.0-85081137520OAI: oai:DiVA.org:ri-44447DiVA, id: diva2:1415127
Note

Funding details: Energimyndigheten; Funding details: Vattenfall;

Funding text 1: The authors would like to thank Powerpipe Systems AB, Göteborg Energi, Hafslund Varme AS, Jönköping Energi AB, Vattenfall AB, Borås Energi och Miljö AB, Tekniska Verken i Linköping AB, Kraftringen Energi AB, Energimyndigheten, Energiföretagen Sverige and Swedenergy AB for valuable discussions, manufacturing of pipes and economic support.

Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2020-03-19Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records BETA

Vega, Alberto

Search in DiVA

By author/editor
Vega, Alberto
By organisation
Infrastructure and concrete technology
In the same journal
Polymer degradation and stability
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 1 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.9