Re: [EnergyPlus_Support] Loads reports on heat transfer surfaces

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

It is very difficult to separate envelope loads from the total zone load, 
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 1 Jul 2005, at 19:42, etndseventy wrote:

> I am trying to track down a problem with a building that I have 
> modeled with DOE and Energy Plus.  What I am looking for is a report 
> variable that will tell me the heating and cooling loads of the 
> various heat transfer surfaces.  (Similar to the LS-B report in DOE) 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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