[Equest-users] Indoor fan separation at ARI

[Omar ElRawy]

*Dear all,*

*               I've got the following reply for a psz system in the
baseline case during preliminary LEED design submittal:*


*"N*ote that section G3.1.2.1 requires that where efficiency ratings, such
as EER and COP, include fan energy, the descriptor shall be broken down
into its components so that supply fan energy can be modeled separately.
Because the efficiency ratings are calculated at ARI-rated conditions, the
fans should also be broken out at ARI-rated conditions. Most simulation
software programs have the capability to perform this step automatically.
Provide documentation showing that this calculation has been performed by
the software automatically or provide calculations consistent with the
ASHRAE 90.1-2007 User’s Manual showing that the calculation has been
performed at ARI-rated conditions."


What I did is that I referred to eQuest library, and documented the
following paragraph to the reviewer:

"COOLING-EIR:
The Electric Input Ratio (EIR), or 1/(Coefficient of Performance), for the
cooling unit at ARI rated conditions..... This EIR is at ARI rated
conditions, i.e., without correction for different temperature or part
load. Note: If you include fan electric energy consumption in your value of
COOLING-EIR, then you should set SUPPLY-KW/FLOW to zero. Otherwise, the
supply fan electrical energy will be double counted........ Imbedding the
fan energy into the COOLING-EIR is valid only if the fan is constant volume
and INDOOR-FAN-MODE = INTERMITTENT; i.e. the fan cycles on/off with the
compressor. If the fan runs continuously during occupied hours, or the fan
is variable volume, then the fan energy cannot be included in the
COOLING-EIR (or HEATING-EIR)."

And I did set fan kw/cfm to zero, intermittent, and constant volume, but
I've got the SV-A report reporting zero kw power demand, and zero fan (kw)
for the system and its zones.

*Then I got an advice stating that:*

"You should do what the reviewer mentions, divide the indoor fan from the
efficiency rating at ARI-rated conditions and model it separately; this way
you will be able to report the appropriate fan power"

My question is:* where do I separately input the indoor fan power (kw), and
what value should it be?, knowing that this is a baseline case that do not
refer to an actual design.*

Thanks,

*Omar ElRawy, LEED AP BD+C*
LEED Project Manager
EA Sustainable Building Consultants
http://www.ea-buildingconsultants.com
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