A Simple 1-D Boundary Condition Representing Combined
Convective-Radiative Heat Transfer Across a Double Membrane
Semi-Transparent Assembly
Yehuda Sinai
CFX Ltd., ANSYS CFX, The Gemini Building, Fermi Avenue,
Harwell, Didcot, Oxfordshire OX11 0QR, UK
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Abstract
In computer simulations of buildings and other structures, in
relation to HVAC and fire, it is fairly common to need to represent
boundaries which are made up of double semi-transparent membranes. An
obvious example is a double-glazed window. When setting up a Computational
Fluid Dynamics (CFD) model of the building, it is sometimes the case that
detailed representation of this type of boundary is superfluous, and the
CFD user wishes simply to replace the assembly by thermal and radiative
boundary conditions. The present paper reports a simple steady-state
one-dimensional model of such assemblies, accounting for the influences of
solar radiation and radiation originating inside the building, as well as
convective transfer. The theory is well suited for CFD or zone
(lumped-parameter) models.
Key words: Computational Fluid Dynamics (CFD) model, thermal
boundary conditions, windows, solar, radiation, facades, HVAC, fire.
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