[Trace-users] Baseline Fan Power with DOAS in proposed and not in baseline

[Anne C. Juran]

The baseline fan power is per 90.1-2007 G3.1.2.9. It is independent of the
proposed static pressure, other than the fan power adjustment factor, PD,
which makes allowances for certain additional devices you might have in the
proposed system. PD is used to solve for A... see 6.5.3.1.1. Trace will do
the calc for you once you put in the proper fan and the fan power adjustment
factor, PD. 

 

 

From: trace-users-bounces at lists.onebuilding.org
[mailto:trace-users-bounces at lists.onebuilding.org] On Behalf Of Nick
Anderson
Sent: Thursday, July 25, 2013 8:25 AM
To: bldg-sim at lists.onebuilding.org; trace-users at lists.onebuilding.org
Subject: [Trace-users] Baseline Fan Power with DOAS in proposed and not in
baseline

 

I'm doing a LEED School simulation.  The proposed building has many water
source heat pumps with a small fan in each that has 3/4" static pressure
(typical 1000 CFM for example) and a dedicated outdoor air unit supplying a
typical 200 CFM to a single WSHP zone direct to the space with its own
supply and return fans with relatively large static pressures (4" Supply, 2"
Return sp).  The baseline building system is 7, VAV with reheat.  The DOAS
system is not necessary in the baseline system since it is an RTU.

 

When it comes to fan power in the baseline case, I am not sure how to keep
the fans the same with such different arrangements and static pressures.
How do I apply the VAV with supply and return fans to represent the proper
static pressure situation of the proposed building so that the fan power
comparison is proper?  How do I calculate the baseline power for each unit?
I want to understand for hand calculations.

 

I am using the latest version of Trace and will be cross posting to the
Trace list for program specific information on how to have Trace properly
handle the calculations automatically.

 

Thanks for any help,

Nick 

 

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