Re: [EnergyPlus_Support] Loads breakdown

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

Opaque Surface Inside Face Conduction is intended for detailed examination of 
the heat balance on a particular inside surface, primarly to support 
comparisons with measured data.  It is not meaningful as a component of the 
current heating or cooling load.  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.  An explanation of this output variable may be 
found in the Input Output Reference.  Search the document for the variable name 
of interest.

Mike


On 27 May 2004, at 19:16, carmen herrero prada wrote:

> Hello all,
> 
> I have run a simulation and i need the heating and
> cooling loads for 2 design days, but I need to break
> down those loads into: Conduction through walls,
> through roof (in the zones where there is roof,
> obviously)and windows (conduction and radiation)
> 
> For the zones with roof I asked for Zone Opaque
> Surface Inside Face Conduction Gain/Loss(W), and,
> since I thought that it would include loads due to
> walls and due to roof, I also asked for Opaque Surface
> Inside Face Conduction Gain/Loss(W) for the roof
> surface. But I found that there was a gain through the
> opaque surfaces of a zone of 670 W and the gain due to
> the roof in that particular zone was 870 W. Is that
> the opaques surfaces in a zone don´t include the roof,
> when there is one? 
> 
> Since it happens during the first hour of the summer
> design day, could it be that there is a gain through
> the roof and some walls are causing loss so that the
> total amount due to opaque surfaces is lower than the
> roof gain?
> 
> I am sure I am missing something or maybe not asking
> for the right output variables. Does anybody have any
> idea?
> 
> Thanks a lot,
> 
> Carmen.
> 
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx



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