Closed GoogleCodeExporter closed 9 years ago
VHEAT and HHEAT simply set the boundary conditions for the connected surfaces
so that the "outside" surface of the two connected segment are at the same
temperature. Material properties and thickness are separate for the two.
CFAST (the model) does still have the capability to use multiple materials in a
surface lining, but the GUI and model inputs no longer support it. This is a
feature we would like to bring back at some point in the future.
Conduction through surfaces connected to the outside are not done through VHEAT
and HHEAT. By default, the outside surface of all compartments is exposed to
the exterior ambient temperature and exchange heat to the exterior by
convection and radiation.
Vent areas are not taken into account for conduction calculations in CFAST in
general. Again, this is something we would like to include in a future
version, particularly radiation through openings, but the heat transfer through
the walls by conduction would be impacted as well.
To be honest, both VHEAT and HHEAT are rarely-used features since they
typically only apply for very conductive materials.
Original comment by cfastdev@gmail.com
on 28 Nov 2012 at 8:54
Original comment by cfastdev@gmail.com
on 25 Mar 2013 at 12:36
Original issue reported on code.google.com by
mikaelno...@gmail.com
on 27 Oct 2012 at 11:38