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<p class=MsoPlainText>Thanks Joe - this is good input. I didn't realize that
you worked on this.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>You're right - it does mean 100% humidity - which I think
looks wrong.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Heres a view of the entire year from the CSWD file
plotted over the entire year. That looks completely wrong to me. I think I'll
stick with the CTYW or the SWERA.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><img width=717 height=559 id="Picture_x0020_1"
src="cid:image001.png@01CB11FA.6037B1B0"><o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Vikram Sami, LEED AP<o:p></o:p></p>
<p class=MsoPlainText>Sustainable Design Analyst<o:p></o:p></p>
<p class=MsoPlainText>1382 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></p>
<p class=MsoPlainText>t: 404-443-7462 f:
404.892.5823 e:
vikram.sami@perkinswill.com www.perkinswill.com<o:p></o:p></p>
<p class=MsoPlainText>Perkins+Will. Ideas + buildings that honor the
broader goals of society<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>-----Original Message-----<br>
From: Joe Huang [mailto:YJHuang@whiteboxtechnologies.com] <br>
Sent: Tuesday, June 22, 2010 10:55 AM<br>
To: Sami, Vikram<br>
Cc: bldg-sim@lists.onebuilding.org<br>
Subject: Re: [Bldg-sim] Beijing weather data<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Vikram,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>I like your plots, but I have one suggestion - you should
plot the total <o:p></o:p></p>
<p class=MsoPlainText>and diffuse radiation as solid shades and the direct
normal as the solid <o:p></o:p></p>
<p class=MsoPlainText>line, since diffuse is always a subset of the total
horizontal, while <o:p></o:p></p>
<p class=MsoPlainText>the direct normal can be higher than either of the other
two because of <o:p></o:p></p>
<p class=MsoPlainText>the sun angles.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>I helped in the creation of the CTYWs back about 14 years
ago, and am<o:p></o:p></p>
<p class=MsoPlainText>aware of the CSWD and SWERA efforts, but have not compared
the three <o:p></o:p></p>
<p class=MsoPlainText>sets in detail. I agree with you that the solar and
humidity on the CSWD <o:p></o:p></p>
<p class=MsoPlainText>look suspicious. Do the 3-4 months showing only a single
temperature <o:p></o:p></p>
<p class=MsoPlainText>line indicate that the wetbulb is identical with the
drybulb, i.e., that <o:p></o:p></p>
<p class=MsoPlainText>RH is at 100% for the whole month? That's hard to
believe. Likewise, the <o:p></o:p></p>
<p class=MsoPlainText>spikes in direct normal solar are no doubt a problem with
the algorithm <o:p></o:p></p>
<p class=MsoPlainText>used to distribute the measured daily to the hourly solar
values.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>The SWERA and CTYW both use similar raw data originally
from the US <o:p></o:p></p>
<p class=MsoPlainText>Climate Data Center. In both files, the solar is
estimated using various <o:p></o:p></p>
<p class=MsoPlainText>radiation models based on cloud cover and other climate
parameters. When <o:p></o:p></p>
<p class=MsoPlainText>"tuned" to measured data, these models have
been found to be pretty <o:p></o:p></p>
<p class=MsoPlainText>accurate on the aggregate, i.e., monthly or annual means,
level, but can <o:p></o:p></p>
<p class=MsoPlainText>be considerably off for any particular hour or day.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Joe<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Joe Huang<o:p></o:p></p>
<p class=MsoPlainText>White Box Technologies, Inc.<o:p></o:p></p>
<p class=MsoPlainText>346 Rheem Blvd. Suite 108D<o:p></o:p></p>
<p class=MsoPlainText>Moraga CA 94556<o:p></o:p></p>
<p class=MsoPlainText>(o) +925 388 0265<o:p></o:p></p>
<p class=MsoPlainText>(c) +510 928 2683<o:p></o:p></p>
<p class=MsoPlainText>yjhuang@whiteboxtechnologies.com<o:p></o:p></p>
<p class=MsoPlainText>www.whiteboxtechnologies.com<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Sami, Vikram wrote:<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> Apologies for the size of the attachment.<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> I'm looking for weather data for Beijing, and I see
three weather files <o:p></o:p></p>
<p class=MsoPlainText>> on the Energy plus site.<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> The first one is the CSWD (Chinese Standard Weather
Data) source.<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> The second is the CTYW (Chinese Typical Year
Weather) source<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> And the last is the SWERA (Solar & Wind Resource
Assessment).<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> It seems like the first one has very strange solar
radiation data - <o:p></o:p></p>
<p class=MsoPlainText>> strange spikes that really look wrong. It also seems
like the humidity <o:p></o:p></p>
<p class=MsoPlainText>> numbers are too high - pretty much 100% most of the
year.<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> The last two look more reasonable and are pretty
similar (which would <o:p></o:p></p>
<p class=MsoPlainText>> indicate that they are more reliable). However -
they both show really <o:p></o:p></p>
<p class=MsoPlainText>> low direct solar in the summer months (less than
diffuse).<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> Has anyone had any experience with this? Which one
should I use?<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> *Vikram Sami*, LEED AP<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> Sustainable Design Analyst<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> 1382 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> t: 404-443-7462 f:
404.892.5823 e: <o:p></o:p></p>
<p class=MsoPlainText>> vikram.sami@perkinswill.com
www.perkinswill.com <o:p></o:p></p>
<p class=MsoPlainText>> <http://www.perkinswill.com/><o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> *Perkins+Will.* Ideas + buildings that honor
the broader goals of society<o:p></o:p></p>
<p class=MsoPlainText>> <o:p></o:p></p>
<p class=MsoPlainText>> *75logo_only.gif*Years of Design Innovation* *<o:p></o:p></p>
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