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<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>Chris, perhaps I can shed some light on this apparition
for you. I was a member of the ASHRAE 55 committee when the adaptive comfort
method was introduced. From data sets with unknown origins a group came up with
statistical evaluation of the results, the mean outdoor temperature. I see some
of the top weather statisticians have already replied and wonder above wonder
when you take the mean temperature, it is somewhat lower than the design
temperature most of us old fogey’s are used to working with. So
mysteriously a 32C design temp gets slimmed down to a 26C mean temp and it fits
the graph.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>When we have to ‘cook’ the books in this
manner we simply take the monthly outdoor dry bulb temperature and divide this
by the number of hours. Now the next question that isn’t explained in 55 is
whether or not the weather data should be taken for only the occupied period or
the whole month ? The plot thickens. A simple explanation on how to use
this methodology is whether or not the user is liable for the calculations and
designs. Imagine a litigation case, when asking the engineer ‘How did you
calculates this?” well I took the mean of the outdoor temperature and I………………….
Case closed.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>Peter Simmonds Ph.D.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>Senior Associate, Advanced Technology Group<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>IBE Consulting Engineers<o:p></o:p></span></font></p>
<p class=MsoPlainText><st1:Street w:st="on"><st1:address w:st="on"><font
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<p class=MsoPlainText><st1:City w:st="on"><st1:place w:st="on"><font size=2
color=navy face=Arial><span style='font-size:10.0pt'>Sherman</span></font></st1:place></st1:City>
Oaks, CA 91423<o:p></o:p></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>p: (818) 377-8220 ext. 246<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>f: (818) 377-8230<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>m: (818) 219-1284<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
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<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>.<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>-----Original Message-----<br>
From: bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of Chris Yates<br>
Sent: Thursday, November 27, 2008 1:59 PM<br>
To: Building Simulation<br>
Subject: [Bldg-sim] calculating the mean monthly outdoor temp</span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>For the purpose of acceptability limits, can anybody
cite any guidance <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>on calculating the mean monthly outdoor temperature?
I've read ASHRAE 55 <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>and it states: "mean monthly outdoor temperature
is the arithmetic <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>average of the mean daily minimum and the mean daily
maximum outdoor <o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>(dry bulb) temperature for the month in
question."<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>Thanks<o:p></o:p></span></font></p>
<p class=MsoPlainText><font size=2 color=navy face=Arial><span
style='font-size:10.0pt'>_______________________________________________<o:p></o:p></span></font></p>
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