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<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman">The warehouse section of our facility in <?xml:namespace
prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags"
/><st1:country-region w:st="on"><st1:place w:st="on">El
Salvador</st1:place></st1:country-region> is to be ventilated only.<SPAN
style="mso-spacerun: yes"> </SPAN>The textile section of the same building
will be cooled and humidity will be controlled. Other areas such as offices and
cafeteria will be cooled. There is no heating load in <st1:country-region
w:st="on"><st1:place w:st="on">El Salvador</st1:place></st1:country-region>. I
reviewed inquiry 5088 (copy below) which would suggest the warehouse should be
modeled with air conditioning in both the base case and the proposed case even
though no cooling will be provided.<SPAN style="mso-spacerun: yes">
</SPAN>Our building is a little different than the building in inquiry 5088 in
that it has no heating load.<SPAN style="mso-spacerun: yes">
</SPAN>Therefore by the 90.1 standard, the standard does not apply (section 2.2)
and it is an unconditioned space.<SPAN style="mso-spacerun: yes">
</SPAN>We feel the ventilated section of our building should be rated based on
energy savings of standard ventilation equipment versus the proposed high
efficiency fans and louvers that we are providing for ventilation.<SPAN
style="mso-spacerun: yes"> </SPAN>We would like to proceed with the
ventilated enclosures being included in the model without heating or
cooling.<SPAN style="mso-spacerun: yes"> </SPAN>Please advise.</FONT></P>
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face="Times New Roman"> </FONT></o:p></P>
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style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman">Inquiry Number: </FONT></P></TD>
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT
face="Times New Roman"><STRONG>5088</STRONG> </FONT></FONT></P></TD></TR>
<TR style="mso-yfti-irow: 1">
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman"><st1:stockticker
w:st="on">MPR</st1:stockticker>/Prerequisite/Credit: </FONT></P></TD>
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman">EAc1: Optimize Energy Performance </FONT></P></TD></TR>
<TR style="mso-yfti-irow: 2; mso-yfti-lastrow: yes">
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman">Posting date: </FONT></P></TD>
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3><FONT
face="Times New Roman"><st1:date w:st="on" Month="11" Day="27"
Year="2007">11/27/2007</st1:date> </FONT></FONT></P></TD></TR></TBODY></TABLE>
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face="Times New Roman"> </FONT></o:p></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman"> </FONT></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman">It is not acceptable to allow spaces to exceed the unmet
load hour requirements of the ASHRAE 90.1-2004 Appendix G methodology. This is a
similar situation to naturally <SPAN style="BACKGROUND: yellow">ventilated
spaces</SPAN>, which are required to include cooling systems to meet space loads
in the proposed case even if the actual building will contain no cooling.
Building owners may always choose to turn off HVAC systems, or not have them
installed at all to conserve energy, but the ASHRAE modeling protocol assumes
that cooling systems will be installed and run with sufficient capacity to meet
space loads. The applicant may use a set-point of 80 degrees Fahrenheit for the
maintenance bays, but cooling system capacity must be increased until the
requirements of ASHRAE 90.1-2004 section G3.1.2.2 are met. The project may still
receive credit for using an efficient cooling system as compared to the ASHRAE
baseline cooling system.</FONT></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3
face="Times New Roman"> </FONT></o:p></P>
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman"> <SPAN class=style2>Inquiry
</SPAN>[<INPUT name=ctlLISearch$rptResults$ctl13$Image2
src="https://www.usgbc.org/images/LI/Minus.GIF" type=image>] </FONT></P>
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cellPadding=0>
<TBODY>
<TR style="mso-yfti-irow: 0; mso-yfti-firstrow: yes; mso-yfti-lastrow: yes">
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><o:p><FONT size=3
face="Times New Roman"> </FONT></o:p></P></TD>
<TD
style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; PADDING-BOTTOM: 0.75pt; BACKGROUND-COLOR: transparent; PADDING-LEFT: 0.75pt; PADDING-RIGHT: 0.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0; PADDING-TOP: 0.75pt">
<P style="MARGIN: 0in 0in 0pt" class=MsoNormal><FONT size=3
face="Times New Roman">Our project is located in <st1:City
w:st="on"><st1:place w:st="on">Las Vegas</st1:place></st1:City> and
consists of a combination of office spaces and maintenance bays for
earth-moving equipment. The owner is a large agency that sells, rents and
repairs such equipment; these repairs are done both inside and outside the
building envelope. The maintenance bays are occupied by mechanics and will
be conditioned with evaporative coolers and gas furnace heat, the system
supplies 100% outside air. This cooling system provides conditioning of
the spaces but is not able to meet all peak loads for a climate such as
<st1:City w:st="on"><st1:place w:st="on">Las Vegas</st1:place></st1:City>
even when these spaces are modeled with higher setpoint at 80 degrees. In
reality, if the maintenance bays go above the temperature setpoints, the
mechanics will continue work in the warmer conditions or take a break.
This is not difficult for maintenance bays, where some of the work will
also done outdoors with no conditioning at all. The owner does not want to
fully condition the maintenance bays with the intention of achieving high
levels of energy efficiency. We propose the following modeling approach
for EA Credit 1. -Baseline model will have a mechanical system based on
Table G3.1.1A of Appendix G with 80 degree temperature setpoint for the
maintenance bays. -Proposed Design model will have the system as designed
in the building that provides partial conditioning with the same 80 degree
temperature setpoint. We will not model additional compressor cooling for
hours where the system is not able to meet loads. This approach will
result in exceeding the difference in the unmet load hours beyond 50 as
required by Appendix G. However, this is a conscious decision by the owner
who wants to maximize energy efficiency by providing limited conditioning
through evaporative cooling for the maintenance bays, and allow the
temperatures to float higher during peak conditions. We feel that this
approach appropriately captures the intent of the design, and gives credit
to the energy efficiency measures being taken. It also provides a way for
demonstrating the value of an energy efficient approach to the community
in <st1:City w:st="on"><st1:place w:st="on">Las
Vegas</st1:place></st1:City> where compressor cooling is increasingly
used, often indiscriminately; this is a desert climate and a different
approach to comfort and conditioning is possible. Is this approach
acceptable? If not, can you advise us on an alternative approach that
addresses the desire of the owner to demonstrate high levels of energy
efficiency for using such a system?</FONT></P></TD></TR></TBODY></TABLE>
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