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<big><font face="Arial" size="2"><big><font face="Arial" size="2"><big><big>Benoît,<br>
Some years ago, there was an ASHRAE research project to look into
this because it is not quite sufficient to add an offset and because
you need design day combination of solar, temperature, and humidity.
The result was a software tooled called "Extremes." I am not sure
whether the software is still available or not but its intent was to
generate extreme sequences of hot or cold conditions based on
historical weather data. <br>
<br>
Kind regards,<br>
David<br>
<br>
</big></big></font></big></font></big><br>
B.Cogné - dH Technologies wrote:
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<div><font face="Arial" size="2">Dear Trnsys users,</font></div>
<div> </div>
<div><font face="Arial" size="2">I am simulating an office building
in order to evaluate the summer comfort without air conditionning.</font></div>
<div><font face="Arial" size="2">My idea is to base this analysis on
the periods during wich a reference indoor temperature (lets say 25°C)
is exceeded, each period being defined by its duration and the maximum
amplitude of the temperature exceeding, and then calculate the quantity
of periods per month, or year, for couples of durations and exceedings
ranges.</font></div>
<div><font face="Arial" size="2">The problem I am facing is the
definition of the meteorological data.</font></div>
<div><font face="Arial" size="2">The TMY2 file in Trnsys for the site
I am studying is Lorient - France.</font></div>
<div><font face="Arial" size="2">I appears that this file does not
include one day with the extreme annual design dry bulb we can find in
Ashrae tables for design conditions, neither a day with the 0,4%
Monthly design dry bulb temperature.</font></div>
<div><font face="Arial" size="2">Example for the period of july and
august:</font></div>
<div><font face="Arial" size="2">- maximum design dry bulb in TMY2
file: 27,4°C</font></div>
<div><font face="Arial" size="2">- Ashrae extreme annual design dry
bulb - Mean : 31.2°C</font></div>
<div><font face="Arial" size="2">- Ashrae Monthly design dry
bulb 0.4% - July : 30.9°C</font></div>
<div>
<div><font face="Arial" size="2">- Ashrae Monthly design dry bulb 1%
- July : 29.1°C</font></div>
</div>
<div>
<div><font face="Arial" size="2">- Ashrae Monthly design dry
bulb 0.4% - August : 30°C</font></div>
<div><font face="Arial" size="2">We see that these 4 extremes values
are very far from the maximum found in TMY2.</font></div>
<div><font face="Arial" size="2">Even it is clearly stated in TMY2
documentation that the data are built for energy analysis only, and not
for sizing purposes, it is surprising to see such differences, as
"dynamic" comfort analysis is also very important.</font></div>
<div><font face="Arial" size="2">I am therefore looking for some
advice on the way to proceed.</font></div>
<div><font face="Arial" size="2">I am ready to make some tricky
adjustments by adding an offset on the extreme temperatures of the TMY2
data in order to reach the annual extreme (Mean) but I don't know if it
makes sense.</font></div>
<div> </div>
<div><font face="Arial" size="2">Looking forward for your help,</font></div>
<div> </div>
<div><font face="Arial" size="2">Best regards</font></div>
<div> </div>
<div><font face="Arial" size="2">Benoît Cogné</font></div>
<div><font face="Arial" size="2">DH TECHNOLOGIES</font></div>
<div><font face="Arial" size="2">France</font></div>
</div>
</font></div>
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