[bldg-sim] Horizontal shading in EQUEST

[Rohini Brahme]

I have also seen similar results. If I remember correctly, I was autosizing the system - and the sizing of the fan cfm is small with shades - which seemed like the reason for lower heating. Also, reduction in reheating is a likely cause - any report that just shows the reheating energy? If you look at the LS-D report, you should find that the heating has increased and the cooling has decreased.
 
Having said that, the shading results always tend to surprise me.
- Rohini
 
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What do you mean by Horizontal Shading? Like fins (the device fin are vertical, but cut down light horizontally) ??
 
I just ran a typical office (250,000 sf) in Fresno, CA in eQuest.  When I put 2.5 ft fins on all the windows, I got a slight decrease in heating as well (but not to your % level).
 
I traded the 2.5 ft fins with 2.5 overhangs. I got a 15% decrease in cooling, and a 13% decrease in heating. This building is dominated by VAV/reheat. What I can surmise is that when the cooling load decreased, the need to reheat decreased as well. That the building is not skin dominated for energy.
 
Anyone else have a clue?
 
John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
100 North Barranca, Suite 820
West Covina, CA 91791 USA
Phone: 626-430-9054
Fax: 626-430-9060
email: jaulbach at nexant.com
 

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From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Jaya Mukhopadhyay
Sent: Wednesday, January 17, 2007 3:25 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] Horizontal shading in EQUEST


I am examining several options for Horizontal shading for an office building using EQUEST.
A synopsis of the answers is as follows:
	Total Annual Energy MBTU	 Space Cooling MBTU	 Space Heating MBTU	
Unshaded Option	 8380	 2411.9	 308.1	
2.5 ft Horizontal shading on East West and South
 
7936.8	 2178.8	 284.2	
5 ft Horizontal shading on East West and South	  
7835
 
2158
 
269.7
 
The Questions:
1. Its very baffling to see the heating consumption go down too. I wanted to see an increase in heating on implementing the shading devices. How can I justify that decrease?
 
2. The building has a total area of 210273 sqft. with 15 ft deep perimeter zones. The shading reduces the energy consumption by 5 to 6 %. Is that acceptable?
 
Any help is greatly appreciated.
Thank you 
Jaya Mukhopadhyay

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