The ability of a soil temperature gradient-based methodology to detect leaks from pipelines in buried district heating channels

Perpar, Matjaž (avtor), Rek, Zlatko (avtor)

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
• UDK: 696.46:628.8:519.6
• ISSN pri članku: 1996-1073
• DOI: 10.3390/en14185712
• COBISS.SI-ID: 76561155
• Datum objave v RUL: 16.09.2021

Gradivo je del revije

• Naslov: Energies
• Skrajšan naslov: Energies
• Založnik: Molecular Diversity Preservation International
• ISSN: 1996-1073
• COBISS.SI-ID: 518046745

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