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

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede:district heating network, heat losses, numerical experiment, soil temperature gradient, water leak, detection method robustness
Vrsta gradiva:Članek v reviji
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Status publikacije:Objavljeno
Različica publikacije:Objavljena publikacija
Leto izida:2021
Št. strani:Str. 1-12
Številčenje:Vol. 14, iss. 18, art. 5712
PID:20.500.12556/RUL-130538 Povezava se odpre v novem oknu
UDK:696.46:628.8:519.6
ISSN pri članku:1996-1073
DOI:10.3390/en14185712 Povezava se odpre v novem oknu
COBISS.SI-ID:76561155 Povezava se odpre v novem oknu
Datum objave v RUL:16.09.2021
Število ogledov:8358
Število prenosov:147
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Gradivo je del revije

Naslov:Energies
Skrajšan naslov:Energies
Založnik:Molecular Diversity Preservation International
ISSN:1996-1073
COBISS.SI-ID:518046745 Povezava se odpre v novem oknu

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:10.09.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:omrežje daljinskega ogrevanja, toplotne izgube, numerični eksperiment, temperaturni gradient v zemljini, puščanje vode, robustnost detekcijske metode

Projekti

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
Številka projekta:P2-0162
Naslov:Tranzientni dvofazni tokovi

Financer:Drugi - Drug financer ali več financerjev
Program financ.:JP Energetika Ljubljana, d. o. o.
Številka projekta:JPE-SCV-49/11
Naslov:Izdelava fizikalnega modela za določanje toplotnih izgub na vročevodnem omrežju sistema daljinskega ogrevanja v Ljubljani

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