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Re: [EnergyPlus_Support] report

Shouldn't the "Opaque Surface Inside Face Conduction" be equal to the amount of heat flux entering a zone combining the convection and radiation.  I thought that using "SurfaceInsideTemperature - ZoneAir Temperature) * SurfaceArea * SurfaceInsideConvectionCoefficient" just accounted for the convective effect on the zone.  I thought the heat flux infinitesimally inside the wall surface should be equal to the heat flux to or from the zone.  Am I wrong in this assumption.  Does the SurfaceInsideConvectionCoefficient incorporate the radiation and convective heat transfer.

Thanks
Ian
  ----- Original Message ----- 
  From: Michael J. Witte 
  To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
  Sent: Tuesday, April 06, 2004 3:34 PM
  Subject: Re: [EnergyPlus_Support] report


  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 to calculate the current load due to the 
  surfaces.  This will include the current load due to solar gains, because solar 
  becomes a load by warming a surface.

  For an example of comparing the load with a hand calculation, see files 
  UAdeltaT,zip and UAdeltaT2.zip in

  http://groups.yahoo.com/group/EnergyPlus_Support/files/Examples/

  Mike


  On 5 Apr 2004, at 20:16, David Cormier wrote:

  > Hello,
  > 
  > I do a simple test with EnergyPlus.  It's about a simple room with no 
  > internal load.  I look at the result
  > 
  > If I add : ZONE1:Zone Window Heat Gain[W](Hourly) + MUR1:Opaque Surface 
  > Inside Face Conduction Loss[W](Hourly) or gain for my wall + TOIT:Opaque 
  > Surface Inside Face Conduction Loss[W](Hourly) or gain
  > 
  > I think that I suppose to have the same result as ZONE1:Zone/Sys Sensible 
  > Load Predicted[W](Hourly).  In heating, its ok, but in cooling, I have a 
  > mistake because the result of the add is always higher than the result of 
  > ZONE1:Zone/Sys Sensible Load Predicted[W]
  > 
  > I suppose that I forget a term in the add ... Do you have an idea?
  > 
  > David Cormier
  > 
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  ========================================================
  Michael J. Witte, GARD Analytics, Inc.
  EnergyPlus Testing and Support      
  EnergyPlus-Support@xxxxxxxx



  The primary EnergyPlus web site is found at:
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