[BLDG-SIM] Reducing HVAC operational period

Peterson, John JPeterson at Vanderweil.com
Thu Jun 14 13:33:19 PDT 2007


Use CO2 sensors in the spaces.  Have a maximum setting for each, with no
allowance for averaging among them.  If any single sensor hits, say,
1000 PPM, the AHU providing outside air should respond by opening the OA
damper.  This control scheme also works well for spaces with changing
occupancy, such as an entire office goes to lunch.  The control logic is
in addition to cooling demand, but works well to save energy from
conditioning the same amount of outside air all day long, every day.  

 

For reducing the lighting load, we have approached it several ways.  One
method was to provide occupancy sensors for each desk, office or area.
Corridors were always lit.  Another was to provide a sophisticated light
sensor system that could energize & dim the lights to maintain an
acceptable lighting level.  This works well for saving energy when you
need to most - hot, sunny days.  It also responds gradually to cloudy
days so that the occupants don't even notice the levels changing.  Each
of these was more expensive, and you are taking control out of the hands
of the occupants for the most part - something most people hate to give
up.  

 

John Peterson, PE, LEED AP

R.G. Vanderweil Engineers, LLP 

625 N. Washington Street     Alexandria, VA  22314-1913 

Tel: (703) 683-9700 

Fax: (703) 683-2480 

www.vanderweil.com 

 

 

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of Vikram
Sami
Sent: Thursday, June 14, 2007 3:46 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Reducing HVAC operational period

 

I'm guessing if you have no operable windows and you have occupancy at
that time, you will have a LOT of unhappy campers - regardless of
climate type. You need fresh air to be productive.  One option could be
to maintain fan power and fresh air, but set the temperature higher (in
tropical climates).

 

Lighting reduction will depend on how well you design the spaces for
daylight harvesting. Again - you don't want people working in the dark. 

 

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 
Responsive Design * Technological Expertise * Exceptional Service 
www.lordaecksargent.com 

 

 

________________________________

From: BLDG-SIM at gard.com [mailto:BLDG-SIM at gard.com] On Behalf Of
Kofoworola
Sent: Thursday, June 14, 2007 12:23 PM
To: BLDG-SIM at gard.com
Subject: [BLDG-SIM] Reducing HVAC operational period

Dear All,

What are the chances that reducing HVAC operating hours (i.e. starting
it at 9.00am rather than 8.30am in the morning and shutting it down 30
minutes before closing hours), will affect indoor air quality and
productivity in office buildings in Tropical climates.

Additionally, could lighting period be reduced during the working period
and for how long within the same tropical conditions.

-- 
Kofoworola, O.F. 

 
 
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