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<div class="moz-cite-prefix">There are basically two types of
weather files - "typical year" or actual year. An actual year
weather file is simply the weather data for that year of record.
A "typical year" is typically composed of months from different
years selected as the most typical or representative for that
month. "Typical year" weather files should be created from at
least 8 years of data on up to 30 years. People used to regard
longer periods of record as more desirable, but this may not
always be true taking into account regional or global climate
change. <br>
<br>
There is plenty of documentation on the creation of "typical year"
weather file sets, such as the TMYX files developed by NREL, IWECX
files by ASHRAE, etc., that can be found on the Web. There's no
right or wrong about whether a "typical year" or actual year file
is more proper. "Typical year" files are generally used when you
don't know the actual year, like for a compliance calculation for
building energy standards or a building yet to be built. Actual
year files should be used if the intent is to compare the
simulation to actual building energy use data.<br>
<br>
Expanding on what David said below, *.BIN weather files used by
eQUEST/DOE-2 do not identify the year on each line of data. If the
EPW file you're looking at shows only 1990, it could be EITHER a
historical year file from 1990 OR a "typical year" file converted
from an original *.BIN file.<br>
<br>
Joe<br>
<br>
<br>
On 2/8/2014 7:17 AM, David Eldridge wrote:<br>
</div>
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<div>These are two separate issues:</div>
<div><br>
</div>
<div>1) what is the format of the columns for use by the program -
EPW file type defines this as a text file that EnergyPlus can
import, eQUEST uses a binary file, NREL TMY2 uses text, etc.
Certain headers or data fields might or might not be included in
different file types.</div>
<div><br>
</div>
<div>2) how the data was chosen to be included - this selection
depends on the algorithm such as using typical meteorological
year, actual data from one continuous period, etc.<br>
<br>
Hopefully the file name might include a description of #2 -
what's included, while the file extension *.epw, *.bin, *.TMY
will tell you what format it is.</div>
<div><br>
</div>
<div>You might need the context of where the file came from to
verify #2 if the file name itself isn't descriptive.<br>
<br>
DSE Mobile</div>
<div><br>
On Feb 8, 2014, at 7:14 AM, "Arunabha Sau" <<a
moz-do-not-send="true" href="mailto:runabha@gmail.com">runabha@gmail.com</a>>
wrote:<br>
<br>
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<div dir="ltr">
<div class="gmail_default"
style="font-family:tahoma,sans-serif;color:rgb(0,0,102)">
<div class="gmail_default" style="font-size:13px">Howdy!</div>
<div class="gmail_default" style="font-size:13px"><br>
</div>
<div class="gmail_default" style="font-size:13px">Recently
I happen to compare two EPW weather files - one from USA
and another from India.</div>
<div class="gmail_default" style="font-size:13px">In the
Indian weather file, they have only included the
readings for only the year 1990 where as in the weather
file from San Francisco has multiple years' entry.</div>
<div class="gmail_default" style="font-size:13px">I am
very confused and wondering if in India, people do use
the proper weather files!!? Can I ask you guys' insight
on this, please? What is the norms and regulations for
making the weather files? Does it have to have 15 or 20
years of weather data in an weather file?</div>
<div class="gmail_default" style="font-size:13px"><br>
</div>
<div class="gmail_default" style="font-size:13px">Thanks!</div>
<div class="gmail_default" style="font-size:13px">Aru</div>
<div class="gmail_default" style="font-size:13px"><br>
</div>
<div class="gmail_default" style="font-size:13px"><i
style="font-family:Georgia,serif;font-size:small">~~~</i><br>
</div>
</div>
<div><span
style="font-family:arial,sans-serif;border-collapse:collapse"><i><font
color="#000066" size="1"><span
style="font-family:Georgia,serif">Texas</span><span
style="font-family:Georgia,serif"> </span><span
style="font-family:Georgia,serif">Aggie '10</span></font></i></span>
<div><span
style="font-family:arial,sans-serif;border-collapse:collapse"><span><span
style="font-family:Georgia,serif"><i><font
color="#000066" size="1">JU, Kolkata '05</font></i></span></span></span></div>
<div><span
style="font-family:arial,sans-serif;border-collapse:collapse"><span><span
style="color:black;font-family:Georgia,serif"><i><font
size="1">~~~</font></i></span></span></span></div>
<div><span style="border-collapse:collapse"><span
style="background-color:rgb(255,255,255)">
<p
style="color:rgb(31,73,125);font-family:Calibri,sans-serif;margin:0in
0in 0pt">
<span
style="color:red;font-family:Arial,sans-serif"><font
size="1"><strong></strong><strong></strong></font></span></p>
<p style="margin:0in 0in 0pt"><font color="#ff0000"
face="Arial, sans-serif" size="1"><i>Try not to
become a man of success, but rather try to
become a man of value.</i><b> </b></font></p>
<p style="margin:0in 0in 0pt"><font size="1"><font
color="#ff0000" face="Arial, sans-serif">- </font><span
style="color:rgb(255,0,0);font-family:Arial,sans-serif">Albert Einstein </span></font></p>
<div
style="color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:15px"><br>
</div>
</span></span></div>
</div>
</div>
</div>
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