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[bldg-sim] Horizontal shading in EQUEST
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
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
Get
your own web address.
Have a HUGE year through Yahoo!
Small Business.
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