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Steam pipe

steam pipe thermal insulation FEA finite element analysis

Steam is passing through the insulated steel pipe. Minimum insulation layer thickness which is required for the allowable heat losses should be found.

Problem type:
Plane-parallel problem of heat transfer.

Steam pipe Steam is passing through the insulated steel pipe. Asbestos Steel r1 r2 r3 Lz Tsteam Tair

r1 = 60 mm, r2 = 80 mm, r3 = ?

Thermal conductivity of steel λsteel = 42 W/(m·K);
Thermal conductivity of asbestos λasbestos = 0.8 W/(m·K);
Temperature of steam Tsteam = 150°C,
Temperature of air Tair = 20°C,
Convection coefficient on the steam side of the pipe αsteam = 100 W/K-m²,
Convection coefficient on the air side of the pipe αair = 30 W/K-m²,
Allowable power of heat losses F = 2.1 kW/m².

Determine the minimum thickness of the insulation (r3-r2) required for allowable heat losses.

Heat flux passing through any cross-section of the pipe is the same and could be measured at the pipe's surface. To solve the problem it is enough to take a piece of the pipe with arbitrary length, since the flux per meter of the length is the same. For convenience we choose such a length so that square of the steel surface equals to 1 m², i.e. Lz = 1/(2π·r2) = 2.122 m. In this case the heat flux density is numerically equal to the heat flux.

Search of the optimal solution is automated via utility LabelMover, which creates and solves series of the problems with different values of r3, converging to the heat flux value of 2.1 kW.

Temperature distribution in the pipe walls.

steam pipe heat flux

steam pipe thermal insulation parametric simulation

r3,mm F, W/m²
QuickField 104.3 2102
Theory* 105 2100
Error 0.7% 0.1%

*Rajput R.K.(2010). Engineering Thermodynamics, Third Edition. Sudbury, MA:Jones and Bartlett Publishers, p. 813. Example 15.11.

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