Question-and-Answer Resource for the Building Energy Modeling Community

VAV works like CAV?

asked 2016-04-13 10:02:46 -0500

Peter Horvath
61 ●4

updated 2016-04-13 11:03:40 -0500

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

I'm trying to simulate an AHU, which modulates its fan speed due to the sensible heat gains from the zones. The AHU should use its own heating and cooling coil without any reheat in the zone (there is no other HVAC equipment there, like FanCoils or radiators)

As far as i know, for this purpose i should use VAV instead of CAV, but when check the fan's Mass Flow Rate it's linear - not modulating at all...

Am I understanding wrongly these systems?

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2016-04-13 11:23:46 -0500

lutinfr
405 ●1 ●7

Fan should have flow control to manage how it’ll function, but current Openstudio does not provide enough flow control. You can try “Warmest Zone Supply Temp and Flow Reset” and set Strategy: FlowFirst – This is only flow control that I see in OS. Temperature control can be placed to other node.

image description

edit flag offensive delete link

Comments

Thank you for your response, but i'm using e+ under DesignBuilder platform - sorry for not informing you.

Peter Horvath ( 2016-04-27 09:25:58 -0500 )edit

add a comment

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Careers

Question Tools

1 follower

Stats

Asked: 2016-04-13 10:02:46 -0500

Seen: 216 times

Last updated: Apr 13 '16

Site design and logo: Copyright © 2015 Big Ladder Software LLC. All rights reserved.
The Unmet Hours and Big Ladder names and logos are trademarks of Big Ladder Software LLC.
User contributions licensed under the Creative Commons Attribution Share Alike 3.0 License.

VAV works like CAV? edit