  An equation based reduced order model applicable to generalized heat equation
and thermal simulations of power electronics systems developed in commercial
CFD tools, is presented in this work. The model considers the physics of heat
transfer between multiple objects in different mediums and presents a set of
equations that can be applied to a wide range of heat transfer scenarios
including conduction, natural and forced convection problems. A few case
studies including heat transfer in a power electronic system are simulated in
Ansys Icepak and the temperatures from the simulations are compared with the
temperatures predicted by the models. The models are observed to be highly
accurate when compared with the simulations. The predictive model described in
this work reduces large complex simulations down to a few parameters which
tremendously improves the computation speed, uses very low physical disk space
and enables fast evaluation of thermal performance of the system for any
changes in the input parameters.
