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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I am trying to model a CAV 90.1 baseline
system 4, but it won’t let me input kW/cfm, just static and efficiency.
The default static value is 1.25, but I’m not sure if that’s
correct because I obviously don’t know the external static of the duct
system. I would rather input the kW/cfm. Any advice?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:3.0pt'><b><i><font
size=3 color="#333399" face="Times New Roman"><span style='font-size:12.0pt;
color:#333399;letter-spacing:1.2pt;font-weight:bold;font-style:italic'>Brian
Goldsmith</span></font></i></b><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><span
style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:
1.0pt;font-weight:normal'><a href="mailto:Brian.Goldsmith@atce.com"
title="blocked::mailto:Brian.Goldsmith@atce.com">Brian.Goldsmith@atce.com</a></span></font></b></strong><span
class=MsoHyperlink><u><font color=blue><o:p></o:p></font></u></span></p>
<p class=MsoNormal><strong><b><font size=1 color=green face="Gill Sans MT"><span
style='font-size:7.5pt;font-family:"Gill Sans MT";color:green;letter-spacing:
1.0pt;font-weight:normal'>direct</span></font></b></strong><font size=1
color=green face="Gill Sans MT"><span style='font-size:7.5pt;font-family:"Gill Sans MT";
color:green;letter-spacing:1.0pt'> 408.487.1217<o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Jeremy Poling<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, April 06, 2011
8:47 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Carol Gardner; Paul Diglio<br>
<b><span style='font-weight:bold'>Cc:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] 90.1
Supply Fan Energy</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:black'>Carol,</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Here's my general thoughts on OA in the model, for what
they're worth. The only problem with using the OA-per keywords in eQuest
is that they are not additive: you can only use OA-flow-per-area or
OA-flow-per-person but not both. Since ASHRAE 62.1-2004 and later
prescriptively defines both per-person and per-area requirements in an additive
fashion, eQuest is incapable of self-calculating the amount of OA required to
comply with ASHRAE 62.1. I'm more often in the role of peer-reviewing
models for engineers before they go to the LEED review teams and this is one
thing I find myself too often receiving a response of "this way should
work." The reviewers will compare the OA amounts specified in EQp1
and EQc2 to the amounts used in the model in EAc1 and will more often than
not kick out a comment if they do not match.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I usually try to minimize the time for having to
respond to comments, especially knowing how many comments energy models
receive. My recommendation to modelers using eQuest is to always
calculate your design CFM values (OA, supply, return, exhaust) outside of the
software using appropriate adjustment factors where necessary or allowed by
codes like ASHRAE 62.1 (elevation, etc.) and then use the direct specification keywords
for zone-level airflows in eQuest. As long as you have elevation zero'd
out you should be able to get eQuest to match the airflow values you
calculated, or else be able to easily identify where the problem is (system
sizing factor >1, etc.). An added benefit is that you do not have to
run the simulation and look at the results to know what CFM values you have in
the model: they are in the input file and can be accessed easily in the summary
tables in the user interface.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>It would be great if eQuest was able to match the ASHRAE
62.1 calcs and even provide an ASHRAE 62.1 summary report (like some other
modeling software can), but I know Hirsch's team was focused on the baseline
compliance engine and the soon-to-come Canadian version, so it is more than
fair to be patient waiting for that feature :) I also know that some
really advanced users have ways to use the customization features in eQuest to
do this already and I encourage them to share/teach...</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In short - the Outside-air-flow keyword should be the
preferred keyword and indeed eQuest overrides all other OA keywords at the zone
level if a value is present for Outside-air-flow.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Separately, when you do calculate CFM values for the model,
don't forget that ASHRAE 90.1-2007 allows credit for pressure drop due to
filters ;) Just one more thing to have to worry about in the model...</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
</div>
<div id=idSignature83948>
<div>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=1 color=black
face=Verdana><span style='font-size:7.5pt;font-family:Verdana;color:black;
font-weight:bold'>Jeremy R. Poling, PE, LEED AP+BDC</span></font></b><o:p></o:p></p>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org on behalf of Carol Gardner<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wed 4/6/2011 7:03 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Paul Diglio<br>
<b><span style='font-weight:bold'>Cc:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] 90.1
Supply Fan Energy</span></font><o:p></o:p></p>
</div>
</div>
</div>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>The reason someone
"thinks OA might cause a problem" is because of the way that someone
thinks it was entered. It sounds like it was entered using outside-air-flow,
and I may be wrong because Michael hasn't really said. Using Outside-Air-Flow
overrides any values eQUEST might otherwise calculate, and I would suggest that
might make a difference. If OA Flow-Per was used instead, that's the one I use,
it gives eQUEST the flexibility to calculate the OA cfm itself. To my mind,
that a good use of an energy model that is not only interactive but uses 8760
hours of weather data. <br>
<br>
Any other thoughts on this?<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Wed, Apr 6, 2011 at 4:07 PM, Paul Diglio <<a
href="mailto:paul.diglio@sbcglobal.net">paul.diglio@sbcglobal.net</a>>
wrote:<o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'>Michael:<br>
<br>
The kW/CFM you used seems reasonable.<br>
<br>
I don't know if you are using a CV or VAV system, but lets assume VAV.
90.1-2007 G3.1.2.9 shows the formula CFMs *.0013+A for baseline BHP. A is
calculated per Section 6.5.3.1.1. Using Table 6.5.3.1.1A VAV, we have the
formula BHP<= CFMs*0013+A. The footnote defines A=sum of
(PD*CFMd/4131). So assuming you have a fully ducted return, the PD is .5
which should be multiplied by (CFMd/4131). If there are various pressure
drops throughout the system we need to estimate the CFM flow at each pressure
drop.<br>
<br>
As an example, let's take a 20,000 CFM VAV system with 18,000 CFM of return air
through a ducted return.<br>
<br>
A = (.5*(18000/4131) = 2.178 <br>
<br>
BHP =20000*.0013+2.178 = 28.17<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'><br>
pFan= 28.17*.746/ Fan Motor Efficiency. Note that since we need kW not
watts per CFM the 746 becomes .746. That is probably the reason you
generated a large kW number. Per Table 10.8 a 30 HP baseline motor needs to be
91% efficient.<br>
<br>
The formula now becomes pFan =28.17*.746/.91 = 23.09 kW. Our kW per CFM
is .0011.<br>
<br>
If I am modeling a proposed project with a defined supply and return CFM, I
would expect that the baseline would be approximately the same. The
CFM/Ft2 required varies greatly between building and systems. In the real
world I see 1.2 or so CFM/Ft2 much, much more than I see .5 CFM/Ft2. Check your
CFM/Ton to see if you are in the ballpark.<br>
<br>
I don't know why someone would think that outside air would cause a
problem. Air is air. Too much outside air would raise energy costs
though.<br>
<br>
Paul Diglio<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> M. Shields <<a
href="mailto:mshields@fstrategies.com" target="_blank">mshields@fstrategies.com</a>><br>
<b><span style='font-weight:bold'>To:</span></b> Paul Diglio <<a
href="mailto:paul.diglio@sbcglobal.net" target="_blank">paul.diglio@sbcglobal.net</a>>;
Carol Gardner <<a href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>>
<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma'><br>
<b><span style='font-weight:bold'>Cc:</span></b> <a
href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Sent:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Wed, April 6,
2011 6:13:53 PM<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users] 90.1
Supply Fan Energy</span></font><o:p></o:p></p>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>I’ll try OA as a per person number instead of a per space
number and see what happens. kW/CFM varied by space between ~ .0007 and
.001, and when I look at the SV-A reports the Fan Demand (kW) matches what I
calculated using 90.1. </span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>I found G3.1.2.9 could possibly be interpreted a couple
different ways (for example the denominator include X BHP instead of the whole
fraction), but the only one which produced a reasonable bhp for to me was </span></font><img
border=0 width=242 height=25 id="_x0000_i1027"
src="cid:image001.gif@01CBF4F6.FA6C6110"><font size=2 color="#1f497d"><span
style='font-size:11.0pt;color:#1F497D'>. I guess this could have been
where I messed up but all the other possibilities generated kW numbers which
didn’t make sense (quite large or negative).</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 face="Times New Roman"><span style='font-size:10.0pt;font-weight:bold'>From:</span></font></b><font
size=2><span style='font-size:10.0pt'> Paul Diglio [mailto:<a
href="mailto:paul.diglio@sbcglobal.net" target="_blank">paul.diglio@sbcglobal.net</a>]
<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, April 06, 2011
5:51 PM<br>
<b><span style='font-weight:bold'>To:</span></b> Carol Gardner; M. Shields<br>
<b><span style='font-weight:bold'>Cc:</span></b> <a
href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] 90.1
Supply Fan Energy</span></font><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face="Times New Roman"><span style='font-size:10.0pt'>Michael:<br>
<br>
Just out of curiosity, what did you calculate for the kW/CFM?<br>
<br>
I have modeled buildings where the ventilation fans use much more energy than
the heating and cooling energy combined.<br>
<br>
Paul Diglio</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=2
face="Times New Roman"><span style='font-size:10.0pt'>
<hr size=1 width="100%" align=center>
</span></font></div>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><font
size=2 face="Times New Roman"><span style='font-size:10.0pt;font-weight:bold'>From:</span></font></b><font
size=2><span style='font-size:10.0pt'> Carol Gardner <<a
href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>><br>
<b><span style='font-weight:bold'>To:</span></b> M. Shields <<a
href="mailto:mshields@fstrategies.com" target="_blank">mshields@fstrategies.com</a>><br>
<b><span style='font-weight:bold'>Cc:</span></b> <a
href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style='font-weight:bold'>Sent:</span></b> Wed, April 6, 2011 5:46:30
PM<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] 90.1
Supply Fan Energy<br>
</span></font><br>
Yes, that is correct and obviously there isn't a large number in there. The
default is 0.5 cfm/sf. I really think it's your outdoor air. Try changing it to
cfm/person.<o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>On Wed, Apr 6,
2011 at 1:47 PM, M. Shields <<a href="mailto:mshields@fstrategies.com"
target="_blank">mshields@fstrategies.com</a>> wrote:<o:p></o:p></span></font></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>Do you mean under the Systems->Fans->Flow Parameters Min
Flow cfm/ft2? I left this blank thinking that equest would then size the
flow rate based on my design parameters for supply air temp and zone temp as
Appendix G requires, is that incorrect?</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 face="Times New Roman"><span style='font-size:10.0pt;font-weight:bold'>From:</span></font></b><font
size=2><span style='font-size:10.0pt'> Carol Gardner [mailto:<a
href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, April 06, 2011
4:04 PM</span></font><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
<b><span style='font-weight:bold'>To:</span></b> M. Shields<br>
<b><span style='font-weight:bold'>Cc:</span></b> <a
href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] 90.1
Supply Fan Energy<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Under the HVAC
systems tab, go to the Air Flow screen and look for the field labeled cfm/sf.
It usually defaults to 0.5 cfm/sf, something I've been going on about a bit
lately on this listserv. A better number is 1 or so, usually but it depends on
building type, exposure, etc. For you, make sure it is not too large. I
suspect, however, that this is not where your problem is. I suspect you have
accidentally entered too much OA. I suggest you go back and simply put in the
Standard 62 cfm/person rate and call it good. I have never specified it as a
cfm rate but that sounds like not such a good idea for energy modeling. See if
that helps.<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>On Wed, Apr 6,
2011 at 12:57 PM, M. Shields <<a href="mailto:mshields@fstrategies.com"
target="_blank">mshields@fstrategies.com</a>> wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>I looked at the ACH based on the SV-A system CFM and the volume
of the zone and it does seem high (2-5 ACH), but I let equest calculate the
system CFM for me.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color="#1f497d" face="Times New Roman"><span style='font-size:11.0pt;
color:#1F497D'>I have one system per zone so I specified OA in the zone tab as
a overall CFM rate based on the 62.1 calculations I did.</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 face="Times New Roman"><span style='font-size:10.0pt;font-weight:bold'>From:</span></font></b><font
size=2><span style='font-size:10.0pt'> Carol Gardner [mailto:<a
href="mailto:cmg750@gmail.com" target="_blank">cmg750@gmail.com</a>] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, April 06, 2011
3:37 PM<br>
<b><span style='font-weight:bold'>To:</span></b> M. Shields<br>
<b><span style='font-weight:bold'>Cc:</span></b> <a
href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] 90.1
Supply Fan Energy</span></font><o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Check your cfm/sf
number in your systems, that would definitely cause this if it's set too high.
Also what field are you using for your OA ventilaton? <br>
<br>
Carol<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>On Wed, Apr 6,
2011 at 12:22 PM, M. Shields <<a href="mailto:mshields@fstrategies.com"
target="_blank">mshields@fstrategies.com</a>> wrote:<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Hi all,<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>I am in the
process of breaking out the fan energy from my HVAC system per ASHRAE 2004
G3.1.2.1, following G3.1.2.9. The amount of energy coming from my fans
seems massive and I’m not sure if that is typical, or if I’ve
messed something up. I started by setting the temperature difference of
20 degrees between supply and desired temp (55/75 cooling and 90/70 for
heating) and specified 62.1-2004 ventilation for outside air. I then ran
equest and used the SV-A reports to get supply CFM for each system. From
that number I then used Table G3.1.2.9 to get BHP for each system, which I then
converted to kW using the formula in ASHRAE. I then took that number and
divided by CFM to get kw/CFM and entered this number on the system->fan
tab. When I go to the SV-A report the system kW is exactly what I
calculated it to be, but the energy required for my ventilation fans is about
the same as my heating and cooling load combined, which seems outrageous.
<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Is this
typical? Have I entered it In the wrong way? I would think fan
consumption would typically be a fraction of the actually heating and cooling
energy. Thanks for any thoughts.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face="Times New Roman"><span style='font-size:10.0pt'>____________________________<br>
Michael Shields<br>
Facility Strategies Group, LLC</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><st1:Street
w:st="on"><st1:address w:st="on"><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'>1012 Market Street, Suite 307</span></font></st1:address></st1:Street><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><st1:place
w:st="on"><st1:City w:st="on"><font size=2 face="Times New Roman"><span
style='font-size:10.0pt'>Fort Mill</span></font></st1:City><font size=2><span
style='font-size:10.0pt'>, <st1:State w:st="on">SC</st1:State> <st1:PostalCode
w:st="on">29708</st1:PostalCode></span></font></st1:place><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face="Times New Roman"><span style='font-size:10.0pt'>Phone: <a href=""
target="_blank" value="+18034934507">803-493-4507</a></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 face="Times New Roman"><span style='font-size:10.0pt'>Fax: <a href=""
target="_blank" value="+18035482511">803-548-2511</a><br>
Email: <a href="mailto:mshields@fstrategies.com" target="_blank">mshields@fstrategies.com</a></span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></span></font></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
<br clear=all>
<br>
-- <br>
Carol Gardner PE<o:p></o:p></span></font></p>
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