Re: [EnergyPlus_Support] heat gains through envelope in E+

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

The variables you refer to are intended for detailed examination of 
the heat balance on a particular inside surface, primarly to support 
comparisons with measured data.  They are not meaningful as 
components of the current heating or cooling load and are not 
reported as a zone total.

Surfaces interact with the zone air heat balance by convection.  So, 
the value of most interest is (SurfaceInsideTemperature - ZoneAir 
Temperature) * SurfaceArea * SurfaceInsideConvectionCoefficient

The best way to calculate 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 be the 
impact of the envelope.

Available explanations of output variables are found in the Input 
Output Reference.  Search the document for the variable name of 
interest.  Many variables have definitions, some do not.

Mike


On 20 Aug 2003, at 22:23, Helen Xing wrote:

> Hello,
> 
> To itemize the hourly heat gains through a buliding's envelope -
> 
> Is there a zone output for "Zone Opaque Surface Inside Face Beam Solar
> Absorbed"?  This output is available for single surfaces from the E+
> results, but the zone sum doesn't seem so.
> 
> For window heat transfer and opaque surface inside face conduction
> (maybe something else as well), E+ gives both heat gain and loss.  Is
> there a zone output for the net value to reduce the data volume?
> 
> One step further, wonder if there is a direct output that gives the
> total net heat gain for a zone through the envelope?
> 
> Is there a manual or something that explains the available output
> names in .RDD files?
> 
> 
> Thanks a lot,
> Helen Xing
> 
> 
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