Application of a Convective-Conductive Heat Transfer Model in the Heat Loss Analysis of a Heat Pipeline Under Flooding Conditions

Polovnikov, V.Yu.; Razumov, N.V.

doi:10.1051/epjconf/201611001064

Cited by 2 publications

(8 citation statements)

References 12 publications

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“…Heat loss of flanges, fittings and fittings are determined in equivalent pipe lengths of the same diameter by the formula [5]:…”

Section: Problem Statementmentioning

confidence: 99%

“…This problem can be solved with using modern approaches to modeling thermal conditions and heat loss of heat transfer systems [5], based on numerical modeling of physical processes.…”

Section: Problem Statementmentioning

confidence: 99%

“…Ball valves are made of steel ST 37, the degree of blackness of the surface was assumed equal to 0.8. The temperatures of the heat carrier and the environment were 100 °C and 25 °C, respectively The average value of the heat transfer coefficient on the outer surface of the valve body was assumed equal to 5 W/(m2•ºС) [5,6]. …”

Section: Initial Datamentioning

confidence: 99%

“…Stop valves are used in various industries [1][2][3][4][5]. It is known [5] that heat loss of a thermal network are made up of linear (heat loss of pipeline sections that do not have fittings and fittings) and local heat loss (heat loss of shaped parts, stop valves, supporting structures, flanges).…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of the heat loss of stop valves of heat networks

2017

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“…Heat loss of flanges, fittings and fittings are determined in equivalent pipe lengths of the same diameter by the formula [5]:…”

Section: Problem Statementmentioning

confidence: 99%

“…This problem can be solved with using modern approaches to modeling thermal conditions and heat loss of heat transfer systems [5], based on numerical modeling of physical processes.…”

Section: Problem Statementmentioning

confidence: 99%

Section: Initial Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of the heat loss of stop valves of heat networks

2017

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“…A number of studies using the numerical simulation of the temperature field have been carried out to identify pipeline heat loss in a buried channel with dry [10][11][12] or wet pipeline insulation [13,14]. In this study, we used a numerical procedure that was presented in detail and validated by an experiment in our previous work [15], a leak detection methodology based on the determination of the soil temperature gradient above the channel was found to be successful.…”

Section: Introductionmentioning

confidence: 99%

The Ability of a Soil Temperature Gradient-Based Methodology to Detect Leaks from Pipelines in Buried District Heating Channels

Perpar

Rek

2021

Energies

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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 (λeq) value of 0.5 W/(m·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·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.

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Application of a Convective-Conductive Heat Transfer Model in the Heat Loss Analysis of a Heat Pipeline Under Flooding Conditions

Cited by 2 publications

References 12 publications

Numerical analysis of the heat loss of stop valves of heat networks

Numerical analysis of the heat loss of stop valves of heat networks

The Ability of a Soil Temperature Gradient-Based Methodology to Detect Leaks from Pipelines in Buried District Heating Channels

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