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<div class=Section1>
<p class=MsoNormal><span style='color:#1F497D'>David – a couple follow-up
questions regarding the two separate circumstances you bring to light:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2;
text-autospace:none'><![if !supportLists]><span style='color:#1F497D'><span
style='mso-list:Ignore'>1)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Using Appendix G as
the governing authority for performing energy simulations<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l1 level2 lfo2;text-autospace:none'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>I now see that Section
G3.1.3.15 states “</span><span style='color:#1F497D'>VAV system supply
fans shall have variable speed drives…” with no mention of this
requirement applying only to individual fans greater than 15 hp. So, for
energy simulation purposes it seems the baseline is required to use VFD’s.</span><span
style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l1 level2 lfo2;text-autospace:none'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>b.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>The wording
specifically identifies “supply fans” but would this apply to return
or relief fans as well? Or, can the baseline return or relief fans be
modeled without VFD’s using constant volume w/ motorized damper on a
bypass loop modulated to maintain building pressure?<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2;
text-autospace:none'><![if !supportLists]><span style='color:#1F497D'><span
style='mso-list:Ignore'>2)<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Using section 6 for
prescriptive code compliance.<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l1 level2 lfo2;text-autospace:none'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>a.<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Is it your
interpretation of Section 6.5.3.2.1 that fanwall air handlers using banks of
individual fans rated at less than 15 hp each would be exempt from the VFD
requirement? (i.e. Fanwall controlled simply by staging individual fans on/off
to maintain system flow & pressure requirements would meet the intent of
this prescriptive section?) OR is this an unintended loop-hole in the wording
of the Standard?<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'>All
responses welcome, <o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:Cheltenham;
color:#A0002F'> </span><span style='font-size:18.0pt;font-family:Cheltenham;
color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><img width=200 height=174 id="_x0000_i1026"
src="cid:image001.jpg@01C9077B.006EC100"
alt="cid:image001.jpg@01C840A4.E711B250"></span><span style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bldg-rate-bounces@lists.onebuilding.org
[mailto:bldg-rate-bounces@lists.onebuilding.org] <b>On Behalf Of </b>David S
Eldridge<br>
<b>Sent:</b> Tuesday, August 26, 2008 10:14 AM<br>
<b>To:</b> bldg-rate@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-rate] ASHRAE 90.1 - VAV Fan Part-Load Power
Limitation<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:black'>The baseline building will still
be constructed in the same method using Appendix G regardless of your choice of
proposed AHU. The baseline system will have a single fan/motor AHU, and
it will have VAV characteristics if required based on the system selection
table and size of the system.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>The portion of the Standard 90.1
you are referring to in Section 6 is for prescriptive compliance. If your
project is using the prescriptive section for code submittal, then you just
have to meet or exceed those requirements without a quantification of
“how much better”.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>Hope this helps!<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p>
<div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-rate-bounces@lists.onebuilding.org
[mailto:bldg-rate-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Dan
Russell<br>
<b>Sent:</b> Tuesday, August 26, 2008 10:04 AM<br>
<b>To:</b> bldg-rate@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-rate] ASHRAE 90.1 - VAV Fan Part-Load Power Limitation<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>My question regards Section 6.5.3.2.1 Part-Load Fan Power
Limitation from ASHRAE Standard 90.1-2004, which states:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"TT118Co00","sans-serif"'>6.5.3.2.1 </span><b><span
style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Part-Load Fan
Power Limitation. </span></b><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>Individual<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>VAV fans with motors 15 hp and larger
shall meet one of<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>the following:<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>(a) The fan shall be driven by a
mechanical or electrical variable-<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>speed drive.<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>(b) The fan shall be a vane-axial fan
with variable-pitch<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>blades.<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>(c) The fan shall have other controls and
devices that will<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>result in fan motor demand of no more
than 30% of<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>design wattage at 50% of design air
volume when static<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;
font-family:"Times New Roman","serif"'>pressure setpoint equals one-third of
the total design static<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Times New Roman","serif"'>pressure,
based on <i>manufacturer’s </i>certified fan data.</span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a project that is using Fanwall technology in the air
handlers that serve the VAV system. The air handler has 3 rows of 8 fans
each of them only 7.5 hp each (at total of 24 – 7.5 hp fans for a total
of 180 hp). When the Standard here says “Individual VAV fans…”
is it saying that for this type of air handler where no individual fan exceeds
15 hp that part-load control is not required? Certainly, if this is true,
using this technology would be great for demonstrating energy points (aka
LEED), but I’m having a hard time justifying this in my mind.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Does anyone know if this Section applies to
“fanwall” technology or if it is simply intended to make
distinction between supply, return, relief, and exhaust fans?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:Cheltenham;
color:#A0002F'> </span><span style='font-size:18.0pt;font-family:Cheltenham;
color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Cheltenham;
color:#A0002F'><img width=200 height=174 id="Picture_x0020_1"
src="cid:image001.jpg@01C9077B.006EC100"
alt="cid:image001.jpg@01C840A4.E711B250"></span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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