[bldg-sim] need a reality check for modeling fan energy of a 100% CV reheat system

Rohini Brahme rbrahme at harc.edu
Mon Jun 5 07:08:42 PDT 2006


there is a variable for exhaust fans at either the zone level or the
system level - that might help.
 
- Rohini
 
 

--------------------------------------------
Rohini Brahme, Ph.D.
Research Scientist
Energy & Building Solutions Group
Houston Advanced Research Center
4800 Research Forest Drive
The Woodlands, TX 77381

Ph: 281-364-6006
Fax: 281-364-6052



	-----Original Message-----
	From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of
Thomas White
	Sent: Saturday, June 03, 2006 10:10 PM
	To: bldg-sim at gard.com
	Subject: [bldg-sim] need a reality check for modeling fan energy
of a 100% CV reheat system
	
	
	Hello everyone:
	 
	I'm modeling a 400,000 sf hospital with 100% outside air and
constant volume reheat system. The priority is infection control and not
energy savings, so the total ventilation load is HUGE. 
	 
	Here's my question. I've input all the CFM values for each
supply air handler (about 500,000 cfm combined), but -- strictly
speaking -- there is no return air since all air is exhausted. So, how
do I account for the kWh of all the exhaust air handlers? The exhaust
air handlers run about 2/3 the CFM of the supply air, with the
difference made up by exfiltration and a multitude of special-purpose
exhaust fans (in the labs and so on).
	 
	I figure my only real option is to treat the exhaust air
handlers as electric loads in the building. They don't contribute to the
heating and cooling loads, but they are a significant energy use.
	 
	Can you think of an alternate way to model exhaust air fans to
account for their energy use while eliminating any energy use for return
fans?
	 
	...Tom
	 
	 
	Thomas J. White, P.E.
	Associate
	Lead Engineer, Energy Services
	LEED(r) Accredited Professional

	 <http://www.glumac.com/>  
________________________________

	320 SW Washington, Suite 200
	Portland, OR 97204-2640
	T.  503.227.5280  F. 503.274.7674  D. 503-345-6246
	
	Thinking. Inside the building.
	http://www.glumac.com <http://www.glumac.com/> 
	 
	 
	 
	
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