[EnergyPlus_Support] Re: Internal mass

["alexandrevarela2000" <amv@xxxxxxxxxxxxxxxxxxxxx>]

Hi Rahul,

Thanks for your interest int his matter. You are mainly right. The 
internal doesn´t "really" afect loads. But internal mass 
should "flatten" indoor air temperature curve. and this is not 
changing that much with increased mass.

Partitions interact with outside environment if you use 
FullInteriorandExterior solar distribution model, since E+ calculates 
the radiation incident in these interior walls. In this way 
partitions are affected by outside conditions (sun).

This model has natural ventilation. This is another outside condition 
affecting internal partitions.

I also have a question about convex and non-convex zones. If I inser 
partitions in a convex zone, in a way that they don't divide the 
zone, I can still say that the zone is convex. Is this right? The 
thing is that if using the E+ definition of convex ("A formal 
definition of convex is that any straight line passing through the 
zone intercepts at most two surfaces"), the zone is no longer convex. 
I hope I could make myself clear...

Maybe I will just post a generic model in the files folder so 
everybody can check out the geometry and fenestration.

Thanks alot for your help,
Alexandre

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Rahul Chillar 
<chillarrahul@y...> wrote:
> Hello
>  
> As you put it, its lot dependent of building physics.Mainly because 
the partitions are not exposed to outside enviornment and its 
temperature fluctuates with the zones temperatures and the 
temperature lag depends on its thermal mass. 
>  
> Also generally the zones being seperated by Internal partitions 
have same temperatures on both the sides of the partitions too.
>  
> Hence the effect of partition is negligible on the loads, mainly 
the partition is preventing the convective transfer between the zones 
which would have take place had they not been present. 
>  
>  
> Thanks
> Rahul Chillar 
>  
>  
> 
> alexandrevarela2000 <amv@e...> wrote:
> Dear all,
> 
> I´ve simulated a building's internal mass like this:
> 
> 1)Internal partitions as InternalMass (construction type Plywood)
> 2)Internal partitions as InternalMass (construction type brick wall)
> 3)Internal partitions modeled as walls (actual surfaces and not 
> internal mass) and using solar distribution FullExterior 
> (construction type brick wall)
> 3)Internal partitions modeled as walls (actual surfaces and not 
> internal mass) and using solar distribution FullInteriorAndExterior 
> (construction type brick wall)
> 
> The results regarding these situations didn´t change that much, 
which 
> doesn´t seem right. On the other hand changing mass properties for 
> external walls, roofs or floors does have a large impact on results 
> (specially floor mass).
> 
> Could this be E+ software related, or is this relating only to the 
> building's physics?
> 
> If you think it helps I will upload the base model.
> 
> Thank you very much,
> Alexandre
> 
> 
> 
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> Thanks 
> Rahul Chillar 
> Grad Student 
> Building Systems lab
> Univ Of Illinois Urbana Champaign
> 
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