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Following up on this question ("Why is Rome in ASHRAE Climate Zone 4
when the weather files say it has less 1514 HDD ?),<br>
I checked through various versions of ASHRAE 90.1 and Standard 169.
Rome was so listed as CZ 4 in Version 2004 (which I have) down
through Version 2010 (which I don't have but trusting what Francesco
said :-)), but as CZ 3A in Version 2013. <br>
<br>
However, when I looked in the Table D-3 of Version 2004, it gives
Rome as having 2684 HDD65 (Fahrenheit), which converts to 1491 HDD10
(Celsius), which is consistent with the 1541 HDD10 of the weather
file that Francesco is using (there are always a few percentage
point differences between the long-term HDD and that from a typical
year file). <br>
<br>
Therefore, my conclusion is that there's a mistake in ASHRAE
90.1-2010, and my suggestion to Francesco is to base the reference
building thermal properties on Climate Zone 3A for ASHRAE 90.1-2013,
or if you don't have a copy, use Climate Zone 3A for ASHRAE
90.1-2010 and point out the error to whoever judges your LEED
application. It should be a "no-brainer".<br>
<br>
Joe<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
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 2/3/2016 7:42 AM, Joe Huang wrote:<br>
</div>
<blockquote cite="mid:56B21FEE.7090403@whiteboxtechnologies.com"
type="cite">
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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 moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</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">
<div dir="ltr">
<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" class="moz-txt-link-abbreviated"
href="mailto:fpasserini.tn@gmail.com"><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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-- <br>
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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
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Direct:
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