Related Resources: heat transfer
Heat Loss Insulated Pipe Equation and Calculator
Heat Loss through a Insulated Pipe Equation and Calculator:
1 Heat transfer is steady since there is no indication of any change with time.
2 Heat transfer is one-dimensional since there is thermal symmetry about the centerline and no variation in the axial direction.
3 Thermal conductivities are constant.
4 The thermal contact resistance at the interface is negligible.
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Areas of the surfaces exposed to convection:
Individual thermal resistances:
All resistances are in series, the total resistance is:
Steady rate of heat loss:
The heat loss for a given pipe length can be determined by multiplying the above quantity by the pipe length L.
Temperature drops across the pipe and the insulation
Q = Heat Steady State Transfer (W)
A = Area (m2)
L = Length (m)
rn = Radius (m)
k = Thermal Conductivity (W/m · °C)
T∞n = Temperature (°C)
Tn = Temperature (°C)
hn = Heat Transfer Coefficient (W/m2 · °C)
Rconv, n = Thermal Resistance (°C/W)
Rinsulation1 = Thermal Resistance Glass (°C/W)