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Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0002-8804-8417
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0003-1725-6478
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0001-9541-3542
2020 (English)In: Tunnelling and Underground Space Technology, ISSN 0886-7798, E-ISSN 1878-4364, Vol. 97, article id 103261Article in journal (Refereed) Published
Abstract [en]

Heat-traced utility corridors (utilidors) can be used in cold regions to install the drinking water and sewer pipes in a shallow trench above the frost depth, thereby limiting excavation needs and the associated economic, social, and environmental costs. Several of these infrastructures were built in the 60s and 70s in Canada, Alaska, Russia, and Norway. More recently, a new type of heat-traced utilidor was built as a pilot project in Kiruna, Sweden to increase the viability of district heating in the area by allowing co-location of all the utility pipes in a shallow trench. Despite several reported cases of undesirably warm drinking water from full-scale projects, previous research efforts on heat-traced utilidors have mainly focused on pipe freeze protection, not on the prevention of excessive temperatures of the drinking water. To ensure comfortable drinking water in terms of taste and smell, an upper temperature limit of 15 °C is usually recommended. The objective of this study was to evaluate the long-term ability of a heat-traced utilidor to maintain sewer temperatures above 0 °C and drinking water temperatures between 0 and 15 °C. Pipe temperatures were measured continuously at two cross sections of a heat-traced utilidor located in Northern Sweden over a period of 22 months. A thermal model, set up and calibrated on the measurements, was used to simulate the impact of extraordinary cold weather conditions on the pipes’ temperatures. The results showed that the utilidor could keep the pipe temperatures within the desired ranges in most cases but that special care should be taken during design to limit drinking water temperatures during the summer.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 97, article id 103261
Keywords [en]
Drinking water distribution, Drinking water temperature, Sewage collection, Low temperature district heating, Pipe insulation, Freeze protection
National Category
Water Engineering Infrastructure Engineering Energy Engineering
Research subject
Urban Water Engineering; Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73076DOI: 10.1016/j.tust.2019.103261OAI: oai:DiVA.org:ltu-73076DiVA, id: diva2:1292817
Funder
Vinnova, 2014-04287Swedish Research Council Formas, 2011-1710
Note

Validerad;2020;Nivå 2;2020-01-29 (johcin)

Available from: 2019-03-01 Created: 2019-03-01 Last updated: 2020-01-29Bibliographically approved
In thesis
1. Shallow co-location of water, sewer and district heating pipes: Applicability in cold climate regions
Open this publication in new window or tab >>Shallow co-location of water, sewer and district heating pipes: Applicability in cold climate regions
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Alternative title[sv]
Grund samförläggning av VA- och fjärrvärmeledningar ovanför tjäldjupet : möjlighet i kalla regioner?
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2019
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-73137 (URN)978-91-7790-326-0 (ISBN)978-91-7790-327-7 (ISBN)
Presentation
2019-05-10, C305, LTU, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-05-03Bibliographically approved

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Pericault, YouenRisberg, MikaelViklander, MariaHedström, Annelie

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