### Heat Loss Insulated Pipe Equation and Calculator

**Heat Transfer Engineering**

**Thermodynamics**

**Engineering Physics **

Heat Loss through a Insulated Pipe Equation and Calculator:

Assumptions:

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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Preview: Heat Loss Through a Insulated Pipe Calculator

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

Where:

Q = Heat Steady State Transfer (W)

A = Area (m^{2})

L = Length (m)

r_{n} = Radius (m)

k = Thermal Conductivity (W/m · °C)

T_{∞n} = Temperature (°C)

T_{n} = Temperature (°C)

h_{n} = Heat Transfer Coefficient (W/m^{2} · °C)

R_{conv, n} = Thermal Resistance (°C/W)

R_{insulation1} = Thermal Resistance Glass (°C/W)

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