[Equest-users] Supply Fan Power

[M. Shields]

The exact comment is this:

 

"The fan power spreadsheet for the Baseline and Proposed models indicate
that the fan power of the exhaust fans have not been modeled identically in
each model. All independent fan systems of the HVAC systems in the actual
design must be modeled identically between the Proposed and Baseline models
at actual equipment capacities (fan volume and fan power) as required by
Table G3.1.10 in the Proposed building column, since the fan design air flow
rates and fan power per Sections G3.1.2.8 and G3.1.2.9, respectively, only
applies to system types 1 through 8 in Table G3.1.1A. If appealing this
credit, revise the Proposed and Baseline models so all independent fan
systems of the HVAC systems are modeled identically between the Proposed and
Baseline models. In addition, separate the energy consumption and peak
demand energy for independent fans in Table 1.8.1 and Table 1.8.2 of the
template and provide revised SV-A reports for each model reflecting the
changes."

 

I initially interpreted this to be that for exhaust systems the bhp/kw needs
to be identical in both buildings and based on the specified equipment from
the mechanical designer, however, my supply fan energy was Ok.  After
reading the comment and Appendix G I am not unsure if I also need to specify
the fan power to be the same for both models, ie use table G3.1.2.9 to
calculate fan power for both instead of just the baseline.

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Patrick J.
O'Leary, Jr.
Sent: Friday, May 20, 2011 8:57 AM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Supply Fan Power

 

from your wording of "independent" it sounds like you may have an
application where you have a unit in the proposed building that is required
but not provided in the design?  or something similar.  is this the case?
if a unit is required in the proposed per the requirement all spaces be
heated/cooled (per the definitions) they are required to be the same as the
units in the baseline building.  if this is not the case if you post the
exact comment it may shed some light on the subject.  otherwise i would
argue the comment is in error - if all of your zones are served by units in
the proposed and you have matching units in the baseline (regardless of
system types) then your approach would be correct.  

On 5/20/11 5:31 AM, M. Shields wrote: 

Good Morning All,

 

I recently received comments back from LEED and one of them was about my fan
power.  In the submission I calculated all of my fan power using G3.1.2.9
for the baseline building, and I used the actual fan power in the proposed
building.  The reviewer has commented that all independent fan systems have
to be modeled identically in both the baseline and the proposed building.
The supply fans use very high efficiency motors, and as such are
substantially more efficient than the calculation that G3.1.2.9 provides.
Is there no way to take credit for using high efficiency supply fans?

 

Thanks,

 

____________________________
Michael Shields

Email: mshields at fstrategies.com

 

 
 
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