[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [EnergyPlus_Support] questions on zone geometry
1. EnergyPlus uses thickness only for heat transfer calculations to determine
thermal resistance and mass. For geometry and shading calculations, surfaces
have no thickness except when there is a window reveal (window is set back from
the exterior surface of the wall).
2. A thick air space is difficult to model. The EnergyPlus airspace material
is simply a constant thermal resistance. There is no convection or radiant
heat transfer within the airspace. You must consult other sources to determine
an appropriate resistance for the airspace.
Mike
On 24 Jun 2004, at 1:35, teklay Weldeabzgi wrote:
> i have some some questions on surface geometry
>
> 1. is there any problem to neglect the thickness of
> the surface example thickness of walls in the
> simulation result?
>
> 2. in my country the construction of is basically
> corregated iron sheet on the top and a chip(soft) wood
> ceiling material. of course there is a wooden or
> steel truss structure which holdes the roof top.
> what i have confused here is that when i take the
> construction in my simulation for this roof is as
> follows,
> Construction,
> Roof1, ! Name
> METAL - GALVANIZED STEEL , !- outside layer
> E4 - CEILING AIRSPACE,
> WOOD - SOFTWOOD 3 / 4 IN; ! Inside layer
> but i don't feel comfort with this b/c the air gap is
> very large so that the thickness of the air gap is
> very important. so how do i consider this thickness os
> air?
>
> thanks
> tek
>
>
>
>
> __________________________________
> Do you Yahoo!?
> New and Improved Yahoo! Mail - 100MB free storage!
> http://promotions.yahoo.com/new_mail
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
>
> Yahoo! Groups Links
>
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
------------------------ Yahoo! Groups Sponsor --------------------~-->
Yahoo! Domains - Claim yours for only $14.70
http://us.click.yahoo.com/Z1wmxD/DREIAA/yQLSAA/dkFolB/TM
--------------------------------------------------------------------~->
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/