[Bldg-sim] Daylight saving simulation in eQUEST

[Vikram Sami]

Lan,

49% is large, but not unreasonable depending on a number of factors:

1. Percentage of Core v/s skin zones 
2. Light level settings. Set the lights to dim at appropriate footcandle
levels (eQUEST defaults to 50fc)
3. Zone depth - If your zone is deeper than 20 feet, I would recommend
setting 2 lighting control sensors at different depths in the zone
controlling 50% (Or appropriate percentages). This is more realistic to
the controls that your actual building will (or should) have. 
4. Glare Indices - I'm not sure how well this factor works in eQUEST,
but the default is set to 100. However if you go into the item help, it
suggests max glare of 22 for offices. If your window shades are set to
movable (either interior or exterior) this triggers the shades. This
would probably be more realistic - especially on east & west facades.

Hope this helps.


Vikram Sami, LEED AP
Direct Phone 404-253-1466 | Direct Fax 404-253-1366

LORD, AECK & SARGENT ARCHITECTURE
1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361
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-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Lan Hu
Sent: Friday, June 20, 2008 9:20 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Daylight saving simulation in eQUEST

Hi, all,

I simulated an office building with 49% window on each orientation, and
compared the results with daylighting and without daylight. The lighting
energy consumption is 48.5% less with daylighting, and the total energy
consumption is 18.5% less. I set the only sensor in each exterior zone
around 15ft from the exterior window and used default values for other
setup. I wonder if anybody with experience of daylighting think these
big(?) saving numbers are realistic?

Any input will be appreciated.

Lan Hu
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