izpis_h1_title_alt

The ability of a soil temperature gradient-based methodology to detect leaks from pipelines in buried district heating channels
ID Perpar, Matjaž (Author), ID Rek, Zlatko (Author)

.pdfPDF - Presentation file, Download (19,84 MB)
MD5: DEA513F3FFC22C8AED0EA653731B2286
URLURL - Source URL, Visit https://www.mdpi.com/1996-1073/14/18/5712 This link opens in a new window

Abstract
We carried out several numerical experiments to analyze how different boundary conditions affect the ability to detect small pipeline leaks. Our method is based on determining the soil temperature gradient above a buried district heating channel. The equivalent thermal conductivity of a wet insulation (leq) value of 0.5 W/(m(middot)K) was used to mimic a small water leakage. To evaluate the heat loss through the channel cross section, the heat conduction model was used for the pipe insulation, the concrete, and the soil, while the convection model was considered within the channel. The following effects were used to simulate different operating conditions: heat convection at the soil surface, leakage only from the supply or return pipe, soil height above the channel, soil thermal conductivity, and pipe diameter. With the exception of leakage only from the return pipe and low soil thermal conductivity 0.4 W/(m(middot)K), the results showed a doubling of the soil temperature gradient when compared with the no-leakage case. This fact undoubtedly confirms the potential of the method, which is particularly suitable for leak detection in old pipelines that have priority for renovation. A key added value of this research is that the soil temperature gradient-based leak detection technique was found useful in most foreseeable DH operating situations.

Language:English
Keywords:district heating network, heat losses, numerical experiment, soil temperature gradient, water leak, detection method robustness
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Year:2021
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:Str. 1-12
Numbering:Vol. 14, iss. 18, art. 5712
UDC:696.46:628.8:519.6
ISSN on article:1996-1073
DOI:10.3390/en14185712 This link opens in a new window
COBISS.SI-ID:76561155 This link opens in a new window
Publication date in RUL:16.09.2021
Views:328
Downloads:58
Metadata:XML RDF-CHPDL DC-XML DC-RDF
:
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Record is a part of a journal

Title:Energies
Shortened title:Energies
Publisher:MDPI
ISSN:1996-1073
COBISS.SI-ID:518046745 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:10.09.2021

Secondary language

Language:Slovenian
Keywords:omrežje daljinskega ogrevanja, toplotne izgube, numerični eksperiment, temperaturni gradient v zemljini, puščanje vode, robustnost detekcijske metode

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
izpis_stevilka_projekta:P2-0162
Name:Tranzientni dvofazni tokovi

Funder:Drugi - Drug financer ali več financerjev
Funding Programme:JP Energetika Ljubljana, d. o. o.
izpis_stevilka_projekta:JPE-SCV-49/11
Name:Izdelava fizikalnega modela za določanje toplotnih izgub na vročevodnem omrežju sistema daljinskega ogrevanja v Ljubljani

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Back