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I beg to differ on this. ASHRAE Climate Zones are very simply
defined based of degree days, plus what I consider a faulty use of
precipitation to differentiate "wet" from "dry" climates. When a
EPW stat file gives the ASHRAE Climate Zone as 3, it's simply
reporting the number of degree days in the file, and in that sense,
absolutely correct. The reason for the discrepancy is that ASHRAE
90.1, or actually ASHRAE Standard 169 (Climate Data for Building
Design Standards), did their climate zone mapping, they came up with
a degree day value that put Rome in Climate Zone 4. The problem in
this case is that all 3 weather files for Rome that I've looked into
(IWEC, IWEC2, IGDG - the one used by Francesco) show HDD from 1440
to 1514, much below the 2000 HDD to fall into Climate Zone 4. I
have a good idea how Standard 169 derived its degree days, but am
waiting for confirmation lest I misspeak.<br>
<br>
In the meanwhile, I would also recommend using the climate zone
shown in 90.1 to set the reference building, but only because that's
what listed, not because it's technically better.<br>
<br>
Joe<br>
<br>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
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(c) (510)928-2683
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</pre>
<div class="moz-cite-prefix">On 2/3/2016 6:43 AM, Jim Dirkes wrote:<br>
</div>
<blockquote
cite="mid:CAFydjmT924ZN2D_TET-gzH-ehL6OG0d_5NjZPN00LAPRDY=7tg@mail.gmail.com"
type="cite">
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<div class="gmail_default"
style="font-family:tahoma,sans-serif;font-size:large;color:#b45f06">Francesco,</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;font-size:large;color:#b45f06">As
I recall, the E+ weather files derive the climate zone based
on various attributes of the weather data. In fact, I think
there is a qualifying statement within the .EPW files which
says the climate zone may not be "perfect"</div>
<div class="gmail_default"
style="font-family:tahoma,sans-serif;font-size:large;color:#b45f06">For
that reason, I would use the climate zone referenced in 90.1</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Feb 3, 2016 at 9:15 AM,
Francesco Passerini <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:fpasserini.tn@gmail.com" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:fpasserini.tn@gmail.com">fpasserini.tn@gmail.com</a></a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">In order to understand what thermal
transmittances I shall impose in a baseline model for
LEED, I have to understand in what climate zone I shall
consider Rome.
<div>In TABLE B-3 "International Climate Zones" of ASHRAE
90.1-2010, "Roma/Fiumicion" is zone 4, while in the
weather file zone 3C is indicated.</div>
<div>The weather file for Fiumicino is available here:</div>
<div> <a moz-do-not-send="true"
href="https://energyplus.net/weather-location/europe_wmo_region_6/ITA//ITA_Roma-Fiumicino.162420_IGDG"
target="_blank">https://energyplus.net/weather-location/europe_wmo_region_6/ITA//ITA_Roma-Fiumicino.162420_IGDG</a><br>
</div>
<div>If you see the .stat file, HDD18°C = 1514, which
respects the thermal criteria for zone 3C (see Table
B-4).</div>
<div>Is TABLE B-3 based on other weather data?</div>
<div>Best Regards</div>
<span class="HOEnZb"><font color="#888888">
<div>Francesco</div>
</font></span></div>
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<p><span
style="font-size:10pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-repeat:initial"></span></p>
James V Dirkes
II, PE, BEMP,
LEED AP<br>
CEO/President<br>
The Building
Performance
Team Inc.<br>
1631 Acacia
Dr, GR, Mi
49504<br>
<br>
Direct:
616.450.8653<br>
<a
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href="mailto:jim@buildingperformanceteam.com" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:jim@buildingperformanceteam.com">jim@buildingperformanceteam.com</a></a><br>
<br>
<a
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href="http://buildingperformanceteamcom" target="_blank">Website </a>l
<a
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href="https://www.linkedin.com/pub/jim-dirkes/7/444/413" target="_blank">LinkedIn</a>
<p
style="margin-bottom:0in;margin-bottom:.0001pt;text-align:center"
align="center"><b><i><span
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<p
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style="font-family:Calibri,sans-serif"><font size="4">Fail
faster!</font></span><br>
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