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Posted by Curbie on April 15, 2011, 6:08 pm
I've been playing around with Typical Meteorological Year (TMY) data
for a couple of years to see what can be learned by calculating it and
trying to organize the results it in a way that would be most helpful
to those interested in alternative-energies, solar-thermal, solar-PV,
wind, bio...

It seems to be getting to the point where I could use some feedback on
what's wrong, what needs to be added, better ways to organize, or

Here's the data sheet for Savannah, GA., calculated from TMY2 and



Posted by Toby.Considine on April 20, 2011, 2:15 pm
You [Jim] may be interested, then, in an effort just firing up to establish=
 standard exchange formats for the exchange of both weather predictions and=
 observations in ways that enable distributed energy.

On one side, the goal is to make the predictive information easily availabl=

On the other side, there is a hope that the observational format can be use=
d by folks such as you to create detailed comparisons of prediction vs resu=
lts. Those observations will still suffer from being down the way at the ne=
arest airport. It is the hope that a variety of commercial services will of=
fer the observational data at a number of locations, and at a number of gra=
nularities. It is also hoped that a number of off-the-shelf weather station=
s will offer information on the same format, or perhaps in standard profile=
s of that format.

We hope that standard information exchange formats will enable, say, open s=
ource development of software to analyze local microclimate vs the macrocli=
mate in the prediction. Examples of microclimate drivers might be:

- site on north slope
- site subject to wind down river valley
- Tree cover or the lack thereof
- Shadow provided by nearby building


As the real action will be in storage, including in pre-expending energy fo=
r planned processes (whether heating, cooling, water pressure, ...) to achi=
eve local sites that are not maleffected by local generation variability an=
d able to manage price and availability swings in the distribution [utility=
] markets, local micro-predictions of the local micro-climates as one-offs =
of the national predictions may be a way to punderstand and predict local e=
nergy budgets, and to plan usage and storage accordingly.

Storage of any kind enables greater reliance on intermittent sources. Great=
er reliance increases value, and reduces payback. And understanding not big=
 climate, but the microclimate lets you plan your storage strategies wisely=

Posted by Jim Wilkins on April 20, 2011, 4:13 pm
ig climate, but the microclimate lets you plan your storage strategies wise=

I've recorded lots of data over the years, and really the only results
that mattered were the total to get through the winter and the rate to
handle the coldest day, both single-point measurements.


Posted by Curbie on April 20, 2011, 7:01 pm

Winter monthly heating degree days & minimum temperatures???


Posted by Jim Wilkins on April 21, 2011, 12:40 am
I'm still working on what a heating degree day is for me. It seems
like the house holds steady or warms slightly on sunny days that reach
at least 45F.

I recorded the minimums almost every morning this past winter, but we
didn't get the usual arctic cold wave.
1/1/2011=34F, 1/2=38F, 1/3=28F, 1/4=27F, 1/5?, 1/6=17F, 1/7=31F=
1/8=28F, 1/9=29F, 1/10=30F, 1/11?, 1/12?, 1/13=26F, 1/14=18F, 1/1=
1/16=27F, 1/17=8F, 1/18=13F, 1/19=34F, 1/20=23F, 1/21=23F. 1/22=
1/23=4F, 1/24=-6F, 1/25=10F, 1/26=5F, 1/27=26F, 1/28=13F, 1/29=
1/30=22F, 1/31=11F.

That period often sees -5F to -10F for a week here. If the jet stream
is south of us we get Hudson's Bay air, if north it can be from the
Gulf of Mexico.


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