[Bldg-sim] EE4 - Packaged VAV with Fan Powered Boxes

[Morgan Heater]

I haven't used EE4 recently, but with eQUEST, you can model the system
explicitly as a series fan powered VAV, and input the fan power for the
boxes directly.  

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Brian Tysoe
Sent: Wednesday, November 17, 2010 2:05 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] EE4 - Packaged VAV with Fan Powered Boxes

 

Hi,

 

I am trying to model a packaged VAV rooftop unit with fan-powered boxes in
the perimeter zones. After hours the RTU fans are off and the fan-powered
boxes cycle to maintain the night setback temperature.

 

How can I correctly model the fan energy for this system in EE4?

 

When I select "Packaged VAV" as my system type there is no option to enter
any fan energy at the zone level.

 

What should I use for a fan schedule and what should I put under "Fan
Operation" at the system level?

 

Currently I do not have the terminal fans entered anywhere, just the RTU
fans. I am not sure if I am over estimating the fan energy because the RTU
fans are cycling to maintain night setback; or if I am under estimating
the fan energy because there are no fans operating at night.

 

Also, if I have an exhaust fan in my RTU in addition to the supply fan and
return fan, should I include it with my supply fan or with my return fan?

 

Thanks,

 

 

Brian Tysoe M.A.Sc., P.Eng., LEED AP 

Mechanical Engineer 

 

 <http://www.mcw.com> MCW Consultants Ltd. 

600-156 Front Street West 
Toronto, ON M5J 2L6 
Phone 416-598-2920 
Fax 416-598-5394 

 

This e-mail may be privileged and confidential. Any unauthorized use is
strictly prohibited. If you received this e-mail in error, please contact
the sender directly. 

 

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