[EnergyPlus_Support] Re: Heat Loss through Exterior Walls

["sara" <my_sunny_night@xxxxxxxxx>]

Dears,

I still cannot calculate the amount of heat loss through the exterior walls that includes both conduction and convection losses. Can anyone tell me how to?

Sara

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "sara" <my_sunny_night@...> wrote:
>
> 
> Liam,
> 
> Let's suppose it's steady state. Then I want to calculate the amount of heat loss through the exterior walls in cold climates. I need to mention that this heat loss includes both conduction and convection losses through the walls.
> 
> Sara
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Liam O'Brien" <liambrn@> wrote:
> >
> > Sara,
> > 
> > It's not that simple because of transient effects.  For example, it would be possible for heat to be "entering" a wall from both sides because of storage effects.  As Karen said, your best bet it to pick one surface in the wall and try to understand the heat loss at that boundary.  For instance, this output variable:
> > "Zone,Average,Surface Int Convection Heat Rate [W]"  
> > 
> > Liam O'Brien
> > 
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "sara" <my_sunny_night@> wrote:
> > >
> > > 
> > > Karen,
> > > 
> > > I mean that like the variables for window heat loss/gain, such as "Zone,Average,Window Heat Gain", "Zone,Sum,Window Heat Gain Energy", and "Zone,Average,Zone Window Heat Gain", I've searched in the RDD file such variables for walls. But, I didn't find anything.
> > > 
> > > Thanks,
> > > Sara
> > > 
> > > 
> > > 
> > > 
> > > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Karen Walkerman <kwalkerman@> wrote:
> > > >
> > > > Sara,
> > > > 
> > > > I think that the variable you want is the convective heat loss between the
> > > > exterior wall and the interior.  From my understanding, heat loss through
> > > > exterior walls in EnergyPlus is calculated as convective losses between the
> > > > interior air space and the wall.  The wall interior surface temperature is
> > > > calculated based on the wall construction and interior and exterior
> > > > conditions.
> > > > 
> > > > --
> > > > Karen
> > > > 
> > > > On Tue, Jul 6, 2010 at 4:36 AM, sara <my_sunny_night@> wrote:
> > > > 
> > > > >
> > > > >
> > > > > Hi Dears,
> > > > >
> > > > > I have 5 walls exposed to outside. I want to know the amount of heat loss
> > > > > through them in total. But, in Output:Variable there isn't any variable for
> > > > > calculating the mentioned amount.
> > > > >
> > > > > Thanks,
> > > > > Sara
> > > > >
> > > > >  
> > > > >
> > > >
> > >
> >
>




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