[Bldg-sim] Chilled beam Vs conventional VAV systems
Fred Betz
fbetz at aeieng.com
Tue Jun 10 14:27:38 PDT 2014
Sanket,
Your energy savings is based on a lot of factors.
· You might see significant reheat reduction if you’re moving less total air.
· You’ll see a fan power savings by moving less air, but be cautious on pressure drop due to reduced AHU size and duct size, which can eat into the fan power savings. A VAV system sized for 450 fpm in the AHU operating most hours between 250-350 fpm may use less energy than a CAV system serving chilled beams where the velocity is 450 fpm all the time even if half as much air is being distributed.
· There shouldn’t be much cooling savings. A little associated with reduced fan heat due to reduced air flow.
· If you have a separate chiller that is providing warmer chilled water to the beams you should see some saving there too versus a central chiller that is generating 44F and then blending the water to 58F for the beams.
Here’s a link to the 2012 SimBuild conference paper “Issues Arising from the Use of Chilled Beams in Energy Models”.
http://www.ibpsa.us/simbuild2012/technical_sessions.shtml
Good luck,
Fred
Fred Betz PhD., LEED AP ®BD&C
Senior Sustainable
Systems Analyst
AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI 53719
P: 608.236.1175 | F: 608.238.2614
fbetz at aeieng.com<mailto:fbetz at aeieng.com> | www.aeieng.com<http://www.aeieng.com/>
From: Sanket Puranik [mailto:sanketpuranik at gmail.com]
Sent: Tuesday, June 10, 2014 1:46 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Chilled beam Vs conventional VAV systems
Hi all,
I have modeled chilled beams and conventional VAV systems for an office building. I am getting 28% lower annual energy consumption with chilled beams.
Has anyone done similar comparison? I would like to confirm if such energy savings are achievable with chilled beams??
Thanks and Regards,
Sanket
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