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<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>
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<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>
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<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'>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@01C90764.97B84610"
alt="cid:image001.jpg@01C840A4.E711B250"></span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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