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Shallow co-location of water, sewer and district heating pipes: Applicability in cold climate regions
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Architecture and Water.ORCID iD: 0000-0002-8804-8417
2019 (English)Licentiate thesis, comprehensive summary (Other academic)Alternative title
Grund samförläggning av VA- och fjärrvärmeledningar ovanför tjäldjupet : möjlighet i kalla regioner? (Swedish)
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: urn:nbn:se:ltu:diva-73137ISBN: 978-91-7790-326-0 (print)ISBN: 978-91-7790-327-7 (electronic)OAI: oai:DiVA.org:ltu-73137DiVA, id: diva2:1294643
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
List of papers
1. Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground
Open this publication in new window or tab >>Temperature performance of a heat-traced utilidor for sewer and water pipes in seasonally frozen ground
(English)Manuscript (preprint) (Other academic)
Keywords
Low temperature district heating, pipe insulation, freeze protection, sewer pipe, drinking water pipe
National Category
Water Engineering Infrastructure Engineering
Research subject
Urban Water Engineering; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-73076 (URN)
Available from: 2019-03-01 Created: 2019-03-01 Last updated: 2019-03-08
2. A novel freeze protection strategy for shallow buried sewer pipes: temperature modelling and field investigation
Open this publication in new window or tab >>A novel freeze protection strategy for shallow buried sewer pipes: temperature modelling and field investigation
Show others...
2017 (English)In: Water Science and Technology, ISSN 0273-1223, E-ISSN 1996-9732, Vol. 76, no 2, p. 294-301Article in journal (Refereed) Published
Abstract [en]

The burial of sewer and water pipes below the maximum ground frost depth can be very costly and laborious in regions with cold winters. If a freeze protection measure is applied, the utility lines can be installed in a shallower trench to reduce the excavation needs. One freeze protection measure, so called heat tracing, consists in supplying heat along the pipes. In this work, the use of 4th generation district heating as a heat tracing solution was investigated at a pilot site in Kiruna, Sweden. The influence of the system on sewer and water pipe temperatures was studied at a snow-free and snow-covered cross section. To this end, five heat tracing temperatures were tested and the corresponding sewer and water pipe temperatures were measured. The field experiment was also simulated with a two dimensional finite volume model. The study showed that, under the climatic conditions of the experiment, a heat tracing temperature of 25 °C allowed to prevent freezing of the pipes while keeping drinking water pipes in a safe temperature range at both cross sections. The other main result was that the developed finite volume model of the sections showed a good fitting to the experimental data

Place, publisher, year, edition, pages
IWA Publishing, 2017
Keywords
District heating, heat tracing, low temperature, pipe insulation, temperature modelling, utilidor
National Category
Water Engineering Energy Engineering
Research subject
Urban Water Engineering; Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-63285 (URN)10.2166/wst.2017.174 (DOI)000406789800006 ()28726696 (PubMedID)2-s2.0-85026329219 (Scopus ID)
Note

Validerad;2017;Nivå 2;2017-08-15 (rokbeg)

Available from: 2017-05-09 Created: 2017-05-09 Last updated: 2019-03-08Bibliographically approved
3. Expansion of Sewer, Water and District Heating Networks in Cold Climate Regions: an Integrated Sustainability Assessment
Open this publication in new window or tab >>Expansion of Sewer, Water and District Heating Networks in Cold Climate Regions: an Integrated Sustainability Assessment
2018 (English)In: Sustainability, ISSN 2071-1050, E-ISSN 2071-1050, Vol. 10, no 10, article id 3743Article in journal (Refereed) Published
Abstract [en]

This study presents an integrated sustainability assessment of technical alternatives for water and heating services provision in suburban areas affected by a cold climate. Each alternative combines a drinking water supply, sewerage (gravity or low-pressure), pipe freeze protection (deep burial or shallow burial with heat tracing) and heating solution (district heating or geothermal heat pumps). An innovative freeze protection option was considered, in which low-temperature district heating (LTDH) is used to heat trace shallow sewer and water pipes. First, the performance of each alternative regarding seven sustainability criteria was evaluated on a projected residential area in Sweden using a systems analysis approach. A multi-criteria method was then applied to propose a sustainability ranking of the alternatives based on a set of weights obtained from local stakeholders. The alternative with a deep buried gravity sewer and geothermal heat pumps was found to have the highest sustainability score in the case study. In the sensitivity analysis, the integrated trench solution with a gravity sewer, innovative heat tracing and LTDH was found to potentially top the sustainability ranking if geothermal energy was used as the district heating source, or if the weight of the cost criterion increased from 24% to 64%. The study highlights the need for integrated decision-making between different utility providers as an integrated solution can represent sustainability gains.

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI, 2018
Keywords
low pressure sewer, low temperature district heating, freeze protection, life cycle assessment, multi-criteria
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-71253 (URN)10.3390/su10103743 (DOI)000448559400385 ()2-s2.0-85055094129 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-10-30 (svasva)

Available from: 2018-10-18 Created: 2018-10-18 Last updated: 2019-04-24Bibliographically approved
4. Data supporting the life cycle impact assessment and cost evaluation of technical alternatives for providing water and heating services to a suburban development in Gällivare Sweden
Open this publication in new window or tab >>Data supporting the life cycle impact assessment and cost evaluation of technical alternatives for providing water and heating services to a suburban development in Gällivare Sweden
2018 (English)In: Data in Brief, E-ISSN 2352-3409, Vol. 21, p. 1204-1208Article in journal (Refereed) Published
Abstract [en]

The article presents input data that were used in Pericault et al. (2018) for life cycle impact assessment and total cost assessment of five technical alternatives for heat and water services provision in a suburban development in Sweden. The data consists of a list of environmental impacts (cumulative exergy demand of energy carriers – CExDe, global warming potential – GWP, abiotic depletion potential of elements – ADPE), costs, amortisation periods, lifetimes and output flows of the system processes composing the alternatives. The data was derived from values collected in lifecycle databases, environmental product declarations, scientific publications and personal communications with companies.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Water Engineering
Research subject
Urban Water Engineering
Identifiers
urn:nbn:se:ltu:diva-71489 (URN)10.1016/j.dib.2018.10.058 (DOI)000457925900164 ()
Available from: 2018-11-07 Created: 2018-11-07 Last updated: 2019-03-08Bibliographically approved

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