This module is an Excel ® Macro. It has the following features:
Joule heating of insulated copper power cable.
The copper conductor cross-sectional area and insulation outside diameter and thickness are user input along with ambient temperature and air flow conditions.
Solution options include forced air, steady- state convection; forced air, transient convection; steady-state natural convection,and transient natural convection.
Temperature dependence of copper resistivity based on the Copper Development Association data is included. Air properties as a function of the film temperature are also included.
Surface and conductor temperatures are calculated. For the transient cases the temperatures are charted versus time. Total heat load (W/m), convective heat transfer coefficient and copper resistivity are output. For the natural convection cases an equivalent forced velocity is calculated and output.
For the transient cases the electrical current can be input as a table of current versus time.
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