Re: [EnergyPlus_Support] Adjacent buildings and CAD files.

["Michael J. Witte" <mjwitte@xxxxxxxx>]

1. Use Purchased Air to calculate peak sensible loads without describing a full 
HVAC system.  See example file PurchAirTables.idf

2.  Yes.  Describe the adjacent structures using shading surfaces.

3.  The IFCtoIDF utility can facilitate this.  Only geometry is transferred, 
the user must then assign appropriate constructions to attach thermal 
properties to the surfaces.  This is an optional component in the EnergyPlus 
installation, if you did not install it, reinstall with this option checked and 
then see the documentation in the EnergyPlusv1-2-2\PreProcess\IFCtoIDF folder.

Mike


On 6 Jul 2005, at 18:24, miau1962 wrote:

> Mike:
> 
> Thank very much you for your explanation.
> 
> 
> First let me introduce myself: I have a BS degree in Mechanical 
> Engineering and I live in Lisbon, Portugal's capital city. I design 
> small HVAC facilities. Up to now I have used only Direct Expansion 
> systems, but I want to use Water-air and all-Air systems (both VAV 
> and CAV). I would like to base my decisions after a carefully load 
> estimation and energy analisys.
> 
> I understand that this group is primarily for e+ users, and I just a 
> rookie in the business. However, the general questions I post will 
> help me a lot understanding the "broader picture".
> 
> ?	After zoning the site, if one is not sure about wich system 
> to aplly, is it possible to run e+ just to calcule only the building 
> thermal loads for each zone in the first place (with no HVACsystem 
> defined), then chose the systems to use, and rerun the input file 
> again?
> ?	The e+ takes in account the shadows created by adjacent 
> buildings and structures? (it's an issue I haven't seen yet in the 
> discussions I found).
> .        As far is I know, there is a way to import CAD drawings of 
> the site in a special format, in order to speed up the process of 
> input file filling. When we do that , besides the building geometry, 
> the wall U values, and doors and windows characteristics (if they 
> are incorporated in the cad file)are also incorporated in the input 
> file?
> 
> Thanks in advance,
> 
> Vítor
> 
> 
> 
> 
> 
> 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




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