Re: [EnergyPlus_Support] energy gained from external sources

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

It is very difficult to separate envelope loads, because a heat balance is 
performed at each surface which includes incident solar and long-wave 
radiation.  There is no report variable with such a value.  Surfaces interact 
with the zone air heat balance by convection.  The ultimate load from the 
surfaces is (SurfaceInsideTemperature - ZoneAir Temperature) * SurfaceArea * 
SurfaceInsideConvectionCoefficient, but this includes the solar gains and 
radiant internal gains which are absorbed by the surfaces.  The best way to 
approximate the contribution from the envelope is to take the total load and 
subtract off the gains from windows, internal loads, infiltration, and 
ventilation.  The remainder will approximate the impact of the envelope.

Mike


On 17 Feb 2005, at 9:57, mohammed khaylani wrote:

> 
> hi
> i know how to get the heat gained from a window from the variable in the
> report...but how can i get the total energy gained through other elements
> (walls,roof) in (watt) or by other word the heat flux(Q) , ignoring any internal
> heat source thanks mohammed samier
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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