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Higher order approximation for combined mode heat transfer in building insulations
For heat transfer through building insulations such as fiberglass, radiation and
conduction are important modes of heat transfer. Moreover, materials like fiberglass
scatter radiation in a highly anisotropic manner. The equations for heat transfer by
simultaneous conduction and radiation are a coupled pair, one of which is of the
nonlinear integrodifferential type. Exact solution for transient heat transfer in this case
is not available, and the approximate solution available is the two-flux model.
The two-flux model does not give good results for transient, combined mode heat
transfer, through an absorbing, emitting, and anisotropically scattering medium.
In this thesis a higher order approximate solution has been developed. It is found
that this model gives appreciably better results than the two-flux model.