Hello.
I was going through some surface output objects, and i came across what i think it may be a typo, on input/output reference, regarding Opaque Surface Inside Conduction. it reads as follows:
Opaque Surface Inside Face Conduction [W]
The heat flow by conduction at the inside face of an opaque heat transfer surface. A positive
value means that the conduction is from just inside the inside face to the inside face. A
negative value means that the conduction is from the inside face into the surface.
I underlined what i think its the error. shouldnt it read "is from the surface into the inside face"?
back to sara's post, it doesnt seem to be an easy task. you could use Opaque Surface Inside Face Conduction Loss [W], but that would give you the ammount of heat form the inside face to the surface. It would still need to be determined the heat exchange between the surface and the outside face. And after that, the heat loss to the outside would still depend on the convective coefficient and the temperature difference between outside and the surface outside face. hope at least this give you some hints in finding an answer to your problem, because i cant seem to find an exact output object for all this.
Pedro
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: my_sunny_night@xxxxxxxxx
Date: Wed, 7 Jul 2010 04:00:08 +0000
Subject: [EnergyPlus_Support] Re: Heat Loss through Exterior Walls
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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