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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'>Hi Omar,<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I believe what you want to do is set your airside
system supply air temperature to be 11°C less than your space temperature
setpoint for cooling. For example, if your space cooling setpoint temperature
is 22°C, your design supply air temperature setpoint is 11°F. This is set on
the cooling tab of the airside system. This should be changed if you decide to
change your room temperature setpoint.<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You say that you’re not modeling for LEED,
yet you are using App G. If your baseline model requires you to follow App. G,
you should not be manually entering your system airflow rates and should let
eQuest size the system appropriately. The calculated design airflow is going
to depend on the envelope construction (walls and windows) in addition to internal
loads. Unless your building construction is identical in base and proposed buildings,
your design airflows will be different. Also your design airflows will vary
when you rotate the building every 90 degrees.<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If you are noticing a significant difference
in system sizes between your two models something else may be impacting the
calculations. Check to be sure your design heating and cooling days are being
specified properly. Look at the LS-C report. The firs section will show the
Day, Hour, WB and DB temperatures of the design day. These are the conditions,
in addition to the internal loads and ventilation requirements, that eQuest
uses to calculate your cooling/heating capacities and airflows.<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Also, if you have central cooling in your
proposed model, check your PS-C report to see if the equipment is oversized for
the loads that eQuest is calculating. If this is the case, your chillers,
boilers, pumps will almost never operate above 60-70%. Ideally, you want a few
hours in the 90-100% bin. This gives some confidence that your systems and
equipment are sized appropriately for your location and loads.<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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>John<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><font size=1 color=gray face=Arial><span style='font-size:
8.5pt;font-family:Arial;color:gray'>John T. Forester, P.E., LEED AP, Mechanical
Design Engineer </span></font><strong><b><font size=1 color="#0000a0"
face="Times New Roman"><span style='font-size:8.5pt;color:#0000A0'>I BVH
Integrated Services I</span></font></b></strong><strong><b><font size=1
color=black face="Times New Roman"><span style='font-size:8.5pt;color:black'> </span></font></b></strong><font
size=1 color=gray face=Arial><span style='font-size:8.5pt;font-family:Arial;
color:gray'>617.658.9008 tel </span></font><strong><b><font size=1
color="#0000a0" face="Times New Roman"><span style='font-size:8.5pt;color:#0000A0'>I</span></font></b></strong><strong><b><font
size=1 color=gray face="Times New Roman"><span style='font-size:8.5pt;
color:gray'> </span></font></b></strong><font size=1 color=gray face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:gray'>617.244.3753 fax</span></font><font
size=1 color="#0000a0" face=Arial><span style='font-size:8.5pt;font-family:
Arial;color:#0000A0'> </span></font><strong><b><font size=1 color="#0000a0"
face="Times New Roman"><span style='font-size:8.5pt;color:#0000A0'>I</span></font></b></strong><strong><b><font
size=1 color=gray face="Times New Roman"><span style='font-size:8.5pt;
color:gray'> </span></font></b></strong><font size=1 color=gray face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:gray'><U4:STREET u5:st="on"><U4:ADDRESS u5:st="on"><U1:STREET u2:st="on"><U6:STREET u7:st="on"><U6:ADDRESS u7:st="on"><U1:ADDRESS u2:st="on">One
Gateway Center Suite 506, <U4:STREET u5:st="on"><U4:ADDRESS u5:st="on"><U1:STREET u2:st="on"><U1:ADDRESS u2:st="on">Newton
MA 02458 </span></font><strong><b><font size=1 color="#0000a0"
face="Times New Roman"><span style='font-size:8.5pt;color:#0000A0'>I <a
href="http://www.bvhis.com"><font face=Arial><span style='font-family:Arial'>www.bvhis.com</span></font></a> I
Hartford ● New Haven ● Boston</span></font></b></strong><font color=gray><span
style='color:gray'><o:p></o:p></span></font></p>
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<hr</U1:ADDRESS></U1:STREET></U4:ADDRESS></U4:STREET></U1:ADDRESS></U6:ADDRESS></U6:STREET></U1:STREET></U4:ADDRESS></U4:STREET>
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<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>Omar Katanani<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, October 25, 2010
3:35 PM<br>
<b><span style='font-weight:bold'>To:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] ASHRAE
90.1 - G3.1.2.8 Design Airflow Rates</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>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Dear all,</span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>I am modeling this same
school for LEED 2009 purposes.</span></font><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><font size=2 color=navy
face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'>ASHRAE 90.1-2007 section “<b><span style='font-weight:bold'>G3.1.2.8
Design Airflow Rates” </span></b>states that System design supply airflow rates
for the <i><span style='font-style:italic'>baseline building design </span></i>shall
be based on a supply-air-to-room-air temperature difference of 11°C or the
required ventilation air or makeup air, whichever is greater.</span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Can someone please check
the attached print screen and confirm if this is what they mean by supply air
to room air temp difference? </span></font><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Furthermore, if I leave
the “Supply air flow rate” input for each zones as default in the baseline
(instead of entering the supply CFM as in the proposed), I am getting a total
consumption for the baseline to be less than the proposed! I am certainly not
going to let eQUEST estimate the supply flow rates! Remember that I’m modeling
for LEED and I aim for a 15% percent reduction in energy costs, which was a
number I got when I assumed the baseline and proposed cases to have the same
defined supply flow rates as per the ventilation rate procedure (provided to me
by the design team).</span></font><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks for your help!</span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Omar</span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>___________________________</span></font><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Omar Katanani<br>
Sustainable Design Engineer</span></font><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Email: <st1:PersonName style="BACKGROUND-POSITION: left bottom; BACKGROUND-IMAGE: url(res://ietag.dll/#34/#1001); BACKGROUND-REPEAT: repeat-x"><a
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lang=EN-GB><o:p></o:p></span></p>
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<p class=MsoNormal><font size=1 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><st1:place w:st="on"><st1:PlaceName w:st="on"><font size=1
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<p class=MsoNormal><font size=1 color=navy face=Arial><span lang=EN-GB
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<st1:Street w:st="on"><st1:address w:st="on">28 Marshalsea Road</st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on">London</st1:City>, <st1:PostalCode
w:st="on">SE1 1HF</st1:PostalCode></st1:place><br>
Tel: +44 (0) 207 939 0989<br>
Fax: +44 (0) 207 939 0981</span></font><span lang=EN-GB><o:p></o:p></span></p>
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