### Heat Loss Insulated Electric Wire Equations and Calculator

**Heat Transfer Engineering**

**Thermodynamics**

**Engineering Physics **

Heat Loss From an Insulated Electric Wire 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.

5 Heat transfer coefficient incorporates the radiation effects, if any.

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Preview: Heat Loss From an Insulated Electric Wire Calculator

Area of wire

Conduction resistance for the plastic cover and a convection resistance for the outer surface in series

Total Conduction Resistance

Interface temperature

Critical radius of insulation of the plastic cover.

Where:

Q = Heat Steady State Transfer (W)

A = Area (m^{2})

L = Length (m)

V = Voltage (v)

I = Amperage (amps)

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} = Thermal Resistance (°C/W)

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

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