RE: [EnergyPlus_Support] glare index difference (upload the input files)

[YuanLu Li <yli006@xxxxxxxxxxx>]

Hi, Jia
 
I had a look at your xls results and the idf file.
 
The warnings can be esily removed, if you follow the error file messages.
 
You have divided the window horizontally.  Because the window glass plus air is more than 1 cm thick, and the height of window glass is about 0.6 m, about 0.15% of light may be blocked by these dividing lines.
 
Therefore the three piece window appears a little smaller.
 

 Dr. Li  

 

---

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: hujia06@xxxxxxxxx
Date: Wed, 28 Oct 2009 15:03:34 -0400
Subject: [EnergyPlus_Support] glare index difference (upload the input files)

 

Dear all,

 

I have a question about Glare Index..

 

First, I simulate an office with a single big window.  The width and the height of the window are 1.8m*1.8,  There are interior blinds for this window, the angle is 45 deg. Through simulation, I got a glare index in every hour.

 

Then, I divided the big window into 3 small windows (each is 1.8 (width)*0.6(height) ) by defining three objects (all of them are windows) in FenestrationSurface:Details. And each small window has the same binds angle and width as the above one.

 

The problem is that when I ran the two simulations, I found the some differences of glare index in these simulations (only the number of window is different, the total area of the window and all each condition are the same) is nearly 10%. I am confused with this phenomenon.

 

I also uploaded the two input files and the EXCEL showing the differences to yahoo group at File : /_Problem_Submittals/glare index comparison.zip.  You can also download it at URL:

http://groups.yahoo.com/group/EnergyPlus_Support/files/_Problem_Submittals/glare%20index%20comparison.zip

 

Could anyone explain the reason why the glare index is difference even if the two input files are the same except the number of windows?

 

Thank you.

 

Jia

---

CDN College or University student? Get Windows 7 for only $39.99 before Jan 3! Buy it now!

__._,_.___

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___