Re: [EnergyPlus_Support] Thermal Conductance

["Michael J. Witte" <mjwitte@xxxxxxxx>]

EnergyPlus does account for inside and outside film coefficients, but 
not in the way that this has traditionally been handled in many 
simulation programs. When a film coefficient is used in other 
programs, it is often a fixed value and does not vary. In 
EnergyPlus, not only does this value vary with the conditions of the 
surface and the surroundings, it can also split the radiation and 
convection terms into separate terms. This should result in a more 
accurate solution. The report value in the construction output only 
takes the user-defined portion of the wall construction into 
account. Note that it is possible to obtain the convection 
coefficients as output, if the user is interested in seeing its value 
or how it varies:

Surface Int Convection Coeff[W/m2-K]
Surface Ext Convection Coeff[W/m2-K]


On 2 Jan 2003, at 16:51, Alexander Beisteiner wrote:

> Dear E+ User
> Looking at the construction output file, I found that the thermal
> resistance (W/m²-K) of a construction is the sum of the resistances of
> all layers- of course. But what about the thermal resistance of inside
> and outside air surface film? Does not E+ account for these values? I
> am looking forward to your comment. Regards Alexander
> 
> __________________________________
> DI (FH) Alexander Beisteiner
> Forschungs- und Technologietransfer
> Pinkafeld GmbH
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