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<DIV><FONT face=Arial color=#000080 size=2>Hello Yuvaraj:</FONT></DIV>
<DIV><FONT face=Arial color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#000080 size=2>Mexico City climate is a 3A
classification and therefore there is no requirement for an economizer
system. </FONT></DIV>
<DIV><FONT face=Arial color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#000080 size=2>The annual average temperature is
64F, and the annual rainfall is 25.7 inches. Using the formula on page 112
of 90.1-2007, the precipitation criteria is 19.58". Since the 25.7" does
not fall below 19.58", it fails in the criteria for dry zone B. It also
fails to meet the marine criteria (zone C), and therefore it classifies as moist
(zone A).</FONT></DIV>
<DIV><FONT face=Arial color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#000080 size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial color=#000080 size=2></FONT> </DIV>
<DIV><FONT face=Arial color=#000080 size=2>Larry</FONT></DIV>
<DIV><FONT face=Arial color=#000080
size=2>===================================<BR>Larry O. Degelman,
P.E. <A
title="mailto:ldegelman@suddenlink.net CTRL + Click to follow link"
href="mailto:ldegelman@suddenlink.net">ldegelman@suddenlink.net</A><BR>Professor
Emeritus of Architecture<BR>Texas A&M
University<BR>===================================</FONT></DIV>
<DIV style="FONT: 10pt Tahoma">
<DIV><BR></DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title="mailto:Yuvaraj.Saravanan@arup.com CTRL + Click to follow link"
href="mailto:Yuvaraj.Saravanan@arup.com">Yuvaraj Saravanan</A> </DIV>
<DIV><B>Sent:</B> Wednesday, November 26, 2008 2:10 PM</DIV>
<DIV><B>To:</B> <A
title="mailto:bldg-rate@lists.onebuilding.org CTRL + Click to follow link"
href="mailto:bldg-rate@lists.onebuilding.org">bldg-rate@lists.onebuilding.org</A>
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<DIV><B>Subject:</B> [Bldg-sim] 90.1 climate zone</DIV></DIV></DIV>
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<P><FONT face=Arial size=2>Hi All,</FONT> <BR><FONT face=Arial size=2>I am
trying to do an energy modeling using ASHRAE 90.1 performance rating method for
a building in Mexico City, Mexico. I am trying to figure out where Mexico City
would fall under for the climate zone. Table B-3 tells me the Zone number but it
does not tell me the Climate Type (A, B or C). So, I followed the Table B-4.
This does not classify between A or B for zone 3 based on the degree days. I
also went through Appendix B2 (Major climate type definitions) page 109. I was
able to climate that it is not Climate Zone type C. But in order to verify
whether I am in B, I need to know the annual precipitation. Where do I get this
value from? Will it be in ASHRAE or any other standards? I searched in the
website and I am getting different values for Mexico city precipitation.
Depending on this I would either fall in A or B. Would like to follow some
standards rather than searching in the website. </FONT></P>
<P><FONT face=Arial size=2>I am writing this story because I need to figure out
whether my baseline would require an economizer or not. Zone-3A does not require
an economizer where as Zone-3B does. </FONT></P>
<P><FONT face=Arial size=2>Any guidance will be appreciated.</FONT> <BR><FONT
face=Arial size=2>Thanks,</FONT> <BR><FONT face=Arial size=2>Yuvaraj</FONT> </P>
<P><FONT face=Arial size=2>_</FONT><FONT face=Arial color=#000000
size=2>_____________________________________________</FONT> <BR><FONT face=Arial
color=#000000 size=2>Yuvaraj Saravanan, PE</FONT> <BR><FONT face=Arial
color=#000000 size=2>Engineer</FONT> </P>
<P><FONT face=Arial color=#000000 size=2>Arup </FONT><BR><FONT face=Arial
color=#000000 size=2>12777 West Jefferson Boulevard Suite 200</FONT> <BR><FONT
face=Arial color=#000000 size=2>Los Angeles CA 90066</FONT> <BR><FONT face=Arial
color=#000000 size=1>tel: 1 310 578 4400</FONT> <BR><FONT
face=Arial color=#000000 size=1>dir: 1 310 578 4521</FONT>
<BR><FONT face=Arial color=#000000 size=1>fax: 1 310 577
7011</FONT> <BR><FONT face=Arial color=#000000 size=1>internal freecall:
x20521</FONT> <BR><FONT face=Arial color=#000000
size=1>yuvaraj.saravanan@arup.com</FONT><BR><A
href="file://www.arup.com"><U></U><U><FONT face=Arial color=#0000ff
size=2>www.arup.com</FONT></U></A> </P><BR><PRE>____________________________________________________________
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