[Equest-users] Indoor fan separation at ARI

Tue Jun 9 08:31:50 PDT 2015

Chris you are right, the unit labels should have been W/cfm not kW.  Thanks
for the catch!
[image: Inline image 2]

*Elizabeth Gillmor  PE, LC, LEED AP*

*e n e r g e t i c s  **consulting engineers, llc*
energetics-eng.com
c 303.619.0091

On Tue, Jun 9, 2015 at 8:49 AM, Jones, Christopher <
Christopher.r.Jones at wspgroup.com> wrote:

>  Just checking but 0.365 kW/cfm seems pretty high.  That is 356 W/cfm.
> The DOE2.2 default is 0.0006 kW/cfm, 0.6 W/cfm for the PSZ system
>
>
>
> [image: cid:image003.png at 01D09C46.E75BA0D0]
>
> *Christopher Jones,* P.Eng.
> Senior Engineer
>
>
>
> *WSP Canada Inc.*
>
> 2300 Yonge Street, Suite 2300
>
> Toronto, ON M4P 1E4
> T +1 416-644-4226
>
> F +1 416-487-9766
>
> C +1 416-697-0065
>
>
>
> www.wspgroup.com
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] *On
> Behalf Of *Elizabeth Gillmor
> *Sent:* Tuesday, June 09, 2015 10:09 AM
> *To:* Omar ElRawy
> *Cc:* equest
> *Subject:* Re: [Equest-users] Indoor fan separation at ARI
>
>
>
> I seem to get this comment frequently so I have it all typed out as a
> stock LEED comment response.  The advice you received is correct. You can
> use the following formulas for fan power and EIR:
>
>
>
> kW/cfm = BHP / 0.746 * Fan Motor Efficiency     (<----from Appendix G)
>
>
>
> BHP = CFM * 0.0013 + Pressure Drop Adjustment
>
>
>
> The baseline EIR is then calculated with fan energy modeled separately,
> using the following formula (same as what eQuest uses in Wizard mode):
>
>
>
> [image: Inline image 1]
>
>
>
> Where ARI Fan Power = fan power at rated ARI conditions (W/Btuh), and CAP
> = total cooling capacity (Btuh).  At rated ARI conditions, the supply fan
> is rated at 0.365 kW/cfm and 400 cfm/ton, such that:
>
>
>
> [image: Inline image 2]
>
>
>
> When normalizing the cooling capacity, the formula is:
>
> [image: Inline image 3]
>
>
>
> When applied to a baseline EER=9.5, the resulting EIR=0.3051.  The eQuest
> wizard will also do this for you correctly, but usually at LEED submittal
> time we are all well past the wizard phase, so the formulas above are handy
> to have.
>
>
>
> Good luck!
>
> Elizabeth
>
>
>
>
>
>
>      *Elizabeth Gillmor  **PE, LC, LEED AP*
>
>
>
> *e n e r g e t i c s  **consulting engineers, llc*
>
> energetics-eng.com
>
> c 303.619.0091
>
>
>
> On Tue, Jun 9, 2015 at 3:26 AM, Omar ElRawy <omaroelrawy at gmail.com> wrote:
>
> *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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