[Equest-users] Exhaust fan power not calc'ed in TRACK-SUPPLY mode

[Anthony]

I’ve experienced the same issue and agree with your assessment.  My workaround involved moving that exhaust fan energy to a relief fan.  Not perfect but good enough for my purposes at the time.  

 

Anthony Hardman, PE, BEAP, LEED AP BD+C

Senior Building Performance Analyst

 <http://www.greenengineer.com/> The Green Engineer, Inc.

Sustainable Design Consulting

54 Junction Square Dr.

Concord, MA 01742

O: (978) 369-8978

D: (978) 610-2801

C: (720) 840-7862

 

The Green Engineer, Inc. is a Certified B Corporation

 

From: Erik Kolderup [mailto:erik at kolderupconsulting.com] 
Sent: Monday, October 26, 2015 1:08 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Exhaust fan power not calc'ed in TRACK-SUPPLY mode

 

Hi,

 

Anyone encountered this apparent eQUEST bug? 

 

I specify a zone exhaust fan and choose the control option "TRACK-SUPPLY" because I want all the air from the zone exhausted and for the exhaust flow to follow the supply air flow provided by the VAV box. I enter a kW/cfm for the exhaust fan and specify variable speed control. 

 

The result is that only supply and return fan power get calculated. Hourly reports show that the return air flow is correctly reduced by the amount that's going to exhaust. Hourly reports also show that exhaust flow at the zone level is correctly matching supply air flow. However, the exhaust fan power disappears. Changes to the kW/cfm (or to the SP input) have no impact on results. Looks to me to be a bug. The same problem seems to happen in the "TRACK-BOTH" exhaust fan control mode.

 

I was able to verify that the exhaust fan power is calculated correctly if I enter a specific exhaust flow value and choose the "TRACK-EXHAUST" control mode. 

 

(And as far as I can tell, there is no hourly variable for exhaust fan power. I could find it only by subtracting hourly supply and return fan power from the total vent fan end use.)

 

-Erik  




Erik Kolderup, PE, LEED AP

erik at kolderupconsulting.com | 415.531.5198 | www.kolderupconsulting.com 

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