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We're doing an off grid system on a farm house in Cumbria, North
England. If anybody has ever seen the film Withnail & I, it's
just down the road from where the famous country retreat was filmed.
<br>
<br>
I'm trying to work out how often there's a need for the backup
generator to kick in. I've done a crude exercise based on hourly
data using vba which will suffice for now. It doesn't take into
account rate at which batteries can be re-charged (yet), but it does
allow for quite a big margin (70%) by assuming everything does a
round trip through the batteries when they're not fully charged,
plus the Depth of Discharge is relatively modest at 20%.<br>
<br>
Talking to one supplier, the frequency of the generator kicking in
sounds like a moot point - they're plc logic brings in the generator
on a fairly regular basis to condition the batteries.<br>
<br>
Cheers<br>
<br>
Chris<span class="st"></span><br>
<br>
On 15/03/2012 22:50, Linda Lawrie wrote:
<blockquote
cite="mid:e0455ef1e62ffbacad03ac570784a3a1@fortlawrie.com"
type="cite">Each of the EPW files have a "stat" file.
<br>
<br>
But you might investigate the "DView" software.
<br>
<br>
I'm not quite sure what you're after -- detailed analysis
(spreadsheetable) or just viewable.
<br>
<br>
<br>
On 15.03.2012 16:39, Chris Yates wrote:
<br>
<blockquote type="cite">Thanks Dru,
<br>
It's actually minimum wind speed occurrences that I'm
interested in -
<br>
when we aren't generating from the wind turbine. Perhaps the
best
<br>
solution is just get to grips with the E+ WTG model and use
hourly
<br>
data.
<br>
Best
<br>
Chris
<br>
<br>
On 15/03/2012 11:39, <a class="moz-txt-link-abbreviated" href="mailto:Dru.Crawley@bentley.com">Dru.Crawley@bentley.com</a> [12] wrote:
<br>
<br>
<blockquote type="cite">The design conditions in the ASHRAE
Handbook (which CIBSE uses some
<br>
of) includes Extreme Annual Wind Speed of 1%, 2.5%, and 5%.
Have a
<br>
specific location in mind?
<br>
<br>
FROM: <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a> [1]
<br>
[<a class="moz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a> [2]] ON BEHALF
OF
<br>
Chris Yates
<br>
SENT: Thursday, March 15, 2012 7:24 AM
<br>
CC: <a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a> [3]
<br>
SUBJECT: Re: [Bldg-sim] working out the 95 percentile of wind
speed
<br>
<br>
<br>
Dear All,
<br>
<br>
Thank you very much. This is all useful stuff. I guess binning
<br>
isn't in the engineering culture over here in the UK in the
same way
<br>
it is in the UK. We tend merely to use hourly weather data to
do
<br>
simulations and can take design data from CIBSE (most of the
time).
<br>
<br>
I'll definitely undertake these exercises. In the mean time, I
<br>
wrote some very crude vba to step through the weather data and
<br>
calculate its effect on battery charge which I'll be happy to
share
<br>
once I've tidied it up a bit.
<br>
<br>
Cheers
<br>
<br>
Chris
<br>
<br>
On 15/03/2012 02:36, Joe Huang wrote:
<br>
<br>
Can't you just sort the data and then look at the values
<br>
corresponding to the percentiles of interest, i.e.,
<br>
8322 for 95% percentile of 8760 hourly data? Am I missing
something
<br>
here ? The only wrinkle in respect to wind speeds is that the
hourly
<br>
values are spot measurements, and not time-averaged over the
hour.
<br>
<br>
Joe
<br>
<br>
Joe Huang
<br>
White Box Technologies, Inc.
<br>
346 Rheem Blvd., Suite 108D
<br>
Moraga CA 94556
<br>
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a> [4]
<br>
<a class="moz-txt-link-abbreviated" href="http://www.whiteboxtechnologies.com">www.whiteboxtechnologies.com</a> [5]
<br>
(o) (925)388-0265
<br>
(c) (510)928-2683
<br>
"building energy simulations at your fingertips"
<br>
<br>
On 3/14/2012 9:09 AM, Chris Yates wrote:
<br>
<br>
Dear bldg-sim'rs,
<br>
<br>
I usually take this kind of data for granted (our industry has
been
<br>
commoditized so much!).
<br>
<br>
Statistics not being my strong point, does anybody know of any
good
<br>
web resources for working out percentile data of various
weather
<br>
characteristics? I have hourly data available and would like
to
<br>
undertake the task in excel (or openoffice).
<br>
<br>
Thanks
<br>
--
<br>
<br>
Chris Yates C Eng MCIBSE
<br>
<br>
/Building Physics Consultant /
<br>
<br>
Tel:+447960731576 [6]
<br>
<br>
Email: <a class="moz-txt-link-abbreviated" href="mailto:chris.malcolm.yates@gmail.com">chris.malcolm.yates@gmail.com</a> [7] [8]
<br>
<br>
Skype: christopher.m.yates
<br>
<br>
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--
<br>
<br>
Chris Yates C Eng MCIBSE
<br>
<br>
_Building Physics Consultant_
<br>
<br>
Tel: +447960731576
<br>
<br>
Email: <a class="moz-txt-link-abbreviated" href="mailto:chris.malcolm.yates@gmail.com">chris.malcolm.yates@gmail.com</a> [11]
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<br>
Skype: christopher.m.yates
<br>
</blockquote>
<br>
--
<br>
<br>
Chris Yates C Eng MCIBSE
<br>
<br>
_Building Physics Consultant_
<br>
<br>
Tel: +447960731576
<br>
<br>
Email: <a class="moz-txt-link-abbreviated" href="mailto:chris.malcolm.yates@gmail.com">chris.malcolm.yates@gmail.com</a> [13]
<br>
<br>
Skype: christopher.m.yates
<br>
<br>
Links:
<br>
------
<br>
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</blockquote>
<br>
<div class="moz-signature">-- <br>
<div>
<p>Chris Yates <span style="color: rgb(79, 98, 40);">C Eng
MCIBSE</span></p>
<p><i style="">Building Physics Consultant<o:p></o:p></i></p>
<p>Tel:<span style=""> </span>+447960731576</p>
<p>Email: <a class="moz-txt-link-abbreviated" href="mailto:chris.malcolm.yates@gmail.com">chris.malcolm.yates@gmail.com</a></p>
<p>Skype: <span class="SpellE">christopher.m.yates</span></p>
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