Re: [EnergyPlus_Support] report

```The surface inside face heat balance consists of conduction, radiation, and
convection, and these must sum to zero.  Your original question tried to relate
surface inside face conduction to zone load.  In a forced air HVAC system, the
load is entirely based on the convective gains to the zone air, the thermostat
senses zone air temperature and the system acts upon the zone air.  So load,
Zone/Sys Sensible Cooling or Heating, is calculated by adding the convective
gains from the surfaces plus convective gains from lights, people, and
equipment.  I see now that you were also trying to compare to "Zone/Sys
Sensible Load Predicted".  That is an approximate load, you should use Zone/Sys
Sensible Cooling Energy (or Heating).

Mike

On 8 Apr 2004, at 11:36, Ian Doebber wrote:

> 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
>
>   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 > >
>   _________________________________________________________________ > MSN
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>   > > > > The primary EnergyPlus web site is found at: >
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>
>
>   ========================================================
>   Michael J. Witte, GARD Analytics, Inc.
>   EnergyPlus Testing and Support
>   EnergyPlus-Support@xxxxxxxx
>
>
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx

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