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Determination of the long-term performance of district heating pipes through accelerated ageing
RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.ORCID iD: 0000-0001-6793-2783
RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
RISE - Research Institutes of Sweden, Built Environment, Energy and Circular Economy.
2018 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 153, p. 15-22Article in journal (Refereed) Published
Abstract [en]

The lifetime of pre-insulated district heating pipes (DHPs) is commonly evaluated using the method described in the normative European Standard EN 253. This lifetime is normally calculated using an Arrhenius equation, which makes use of test results from accelerated ageing tests at elevated temperatures. In this investigation, long-term accelerated ageing tests of DHPs at elevated temperatures were carried out. The ageing behaviour, especially at the interface between steel pipe and polyurethane (PUR) foam, showed several routes of degradation. It is clearly demonstrated using measurements of shear strength, thermal conductivity and alterations of chemical structure by Fourier Transform Infrared spectroscopy that the results of accelerated ageing at 170 and 150 °C significantly diverge from those obtained from the ageing test at 130 °C. It is therefore concluded that accelerated ageing at commonly used high temperatures does not create an acceleration of degradation processes at the steel/PUR interface relevant for the DHP application, but rather a significant alteration in mechanism. This finding is of crucial importance for the use of EN 253 and the development of future methods for lifetime prediction of DHPs.

Place, publisher, year, edition, pages
2018. Vol. 153, p. 15-22
Keywords [en]
Accelerated ageing, Degradation, District heating pipe, Lifetime prediction, Polyurethane foam, Shear strength, Thermal conductivity, District heating, Fourier transform infrared spectroscopy, Polyurethanes, Testing, Accelerated ageing tests, Arrhenius equation, Degradation process, Elevated temperature, Long term performance
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34304DOI: 10.1016/j.polymdegradstab.2018.04.003Scopus ID: 2-s2.0-85045381494OAI: oai:DiVA.org:ri-34304DiVA, id: diva2:1236842
Note

 Funding details: Energimyndigheten; Funding details: BASF;

Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2019-06-18Bibliographically approved

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Vega, Alberto

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