RE: [EnergyPlus_Support] Re: ASHRAE 90.1 Windows

["Michelle" <michelle@xxxxxxxxxxxxxxx>]

Thank you both - cleared up a lot!

 

MB

  _____  

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Griffith, Brent
Sent: Tuesday, February 12, 2008 10:53 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] Re: ASHRAE 90.1 Windows

 

Both "composite constructions" and "minimum-standard constructions"
involve adjusting values for a material layer inside the assembly in an
attempt to use a 1-d model work for what is actually 3-D heat transfer
situation. The goal for the composite constructions data set is to
account for known framing effects as well as is practical. The goal for
minimum standard is to hit the assembly U-value listed in a Standards
document. The standards committee is probably trying to account for 3-D
effects when choosing assembly U-values but the analysis behind
CompositeWallConstruction.idf is much more robust (developed from 3-D
finite difference modeling). There is no reason you could not edit a
construction in CompositeWallConstruction to hit a Standard's U-value,
but you would no longer have something based on the 3-D analysis behind
CompositeWallConstruction.idf. 

If you aren't finding the constructions you want in the
CompositeWallConstruction.idf data set, then (because there is so much
analysis behind the data) the best you can do is pick one that is close.

________________________________

From: EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
[mailto:EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com] On Behalf Of brittm35
Sent: Tuesday, February 12, 2008 10:33 AM
To: EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
Subject: [EnergyPlus_Support] Re: ASHRAE 90.1 Windows

Does the advice to use the example file generator also apply to
building composite walls/roofs for which we don't find examples in the
CompositeWallConstruction.idf file? The documentation says to not
edit the inner layer of the composite wall construction...I see how to
build layered walls, but once framing comes into play that creates
bridging effect, or is otherwise not a "layer" I'm not clear. Someone
said if the goal is an R-13 (for example) just layer something that
gives you an R-13, this doesn't sound right? Shouldn't I be building
something that reflects different thermal properties of say an R-13
concrete vs steel framed vs stick framed?

Thank you, and I apologize if this is terribly basic, I did scour old
posts and documentation.

--- In EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
<mailto:EnergyPlus_Support%40yahoogroups.com> , "Griffith, Brent"
<brent_griffith@...> wrote:
>
> You can copy minimum-standard constructions out of example files
> produced by the EnergyPlus Example File Generator.
> 
> 
> 
> ________________________________
> 
> From: EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
<mailto:EnergyPlus_Support%40yahoogroups.com> 
> [mailto:EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
<mailto:EnergyPlus_Support%40yahoogroups.com> ] On Behalf Of JV Dirkes
II
> Sent: Monday, February 11, 2008 4:38 PM
> To: EnergyPlus_Support@ <mailto:EnergyPlus_Support%40yahoogroups.com>
yahoogroups.com
<mailto:EnergyPlus_Support%40yahoogroups.com> 
> Subject: [EnergyPlus_Support] ASHRAE 90.1 Windows
> 
> 
> 
> Dear EPlus Support Team,
> 
> I'm hoping that someone has compiled a set of glazing inputs which
> match the "U" and "SHGC" values needed for the ASHRAE 90.1 "baseline"
> models.. and are willing to share them. I'm working on a Climate Zone
> 5 model and am trying to avoid the iterations in Window 5 in order to
> get the proper properties. Thanks!
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>

[Non-text portions of this message have been removed]

 



[Non-text portions of this message have been removed]



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