[bldg-sim] Fan energy and cooling energy for VAV system

[Renee J. Azerbegi]

I was just having a similar problem using Appendix G. For the proposed
design you are to use the CFM of the design; for the base design you are
supposed to let eQuest autosize with a supply air reset delta T of 10 F.
eQuest still predicts much lower CFMs than the design engineer, so it
results in a net energy penalty. 

Renee

 

  _____  

From: bldg-sim at gard.com [mailto:bldg-sim at gard.com] On Behalf Of Martin YIP
Sent: Thursday, November 17, 2005 11:38 PM
To: bldg-sim at gard.com
Subject: [bldg-sim] Fan energy and cooling energy for VAV system

 

Dear Sirs/Madams,

 

I am using eQuest to model an existing office zone with VAV system and have
performed a parametric run with different shading coefficient for the
glazing.  My problem is the large inconsistency when I model the case with
the VAV supply air fan design CFM defined and when I model the case with the
VAV supply air fan design CFM not defined.  For the run that have the design
flow rate defined, the fan energy (SS-L report) and cooling energy (SS-A
report) of the VAV system stays relatively constant for different parametric
scenario.  However, when the supply flow rate is not defined, the fan energy
and cooling energy varies significantly with different parametric scenario
(in which I think it is more reasonable).  Does anyone have similar
experience or comments on the case.

 

Regards

Martin YIP

 

 
 
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