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This is a little off-topic, but something I've pondered for some
time...<br>
<br>
The question is when people are using eQUEST/DOE-2 with historical
year weather, what do you do when it's a leap year? Since DOE-2<br>
always simulates a 365-day year, do you just ignore the missing
leap day, but then don't the Days of Week also get screwed up
starting in March?<br>
<br>
Since a quarter of the years are leap years, I've never understood
why accounting for them has been considered an insignificant detail.
<br>
I mean, if I told you that a quarter of the time your simulation
results would be a little wrong, isn't that a pretty high frequency?<br>
<br>
Many eQUEST/DOE-2 users also have the mistaken impression that the
fault lies in the DOE-2 weather files, which is not true. <br>
Believe it or not, but the packed DOE-2 weather file format actually
contains 384 days (32 days per month), and all the DOE-2 weather
files I produce always contains Feb. 29 for the leap years (as well
as other enhancements like greater precision in the data).<br>
<br>
So, where does the problem lie? It's in the clock within DOE-2 that
always sets February to be 28 days. In other words, DOE-2 will read
the weather file and do the simulation only through February 28th,
even though the weather file contains data through February 32nd
(:-)), although everything beyond the 28th would be blank on
non-leap years, and beyond the 29th on leap years. <br>
<br>
When I've looked through the DOE-2.1E code, there are even flags
setting the leap years but these are never used. I've thought many
times of toying around with the code to see how difficult it would
be to implement leap years, but just haven't gotten around to it.
As far as I can see, the biggest difficulty might might have to do
not with the simulation itself, but with the reporting.<br>
<br>
I'd like to know if others think this is something of sufficient
importance to merit further investigation.<br>
<br>
Joe<br>
<br>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 6/23/2015 10:27 AM, Collinge,
William Overton wrote:<br>
</div>
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cite="mid:c87f2349f51c484c83425de545fe74c8@pitt-prodx-04.univ.pitt.edu"
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">All,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">This
is a fantastic thread, and I am wondering if it could be
taken one step further to query if anyone has experience
with methods to attempt calibrating models of energy savings
attributable to retrofits of multiple systems simultaneously
(plant, envelope, HVAC etc. – as most real-world retrofits
likely are), going past the 4- or 5-parameter breakpoint
regression models to incorporate inverse modeling of
specific load types and their space- or time-variable
characteristics. This would fit under multivariate methods
in the last line of Table 2 in the older version of ASHRAE
Guideline 14 that Jeff Haberl has posted on his website, and
would attempt to standardize Maria’s Step 5 below without
(possibly) the need to conduct as much in-depth field
verification as might otherwise be required. I’ve dabbled in
this a little bit…without extensive discussions with others…<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Example:
changing the OA ventilation rate is going to have a specific
load profile versus some retrofit that affects the solar
gain rate. Of course, much easier in theory to do
calibrations of this sort with hourly meter data versus
monthly utility bills…<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Bill
Collinge<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Postdoctoral
Scholar<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">University
of Pittsburgh<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Department
of Civil and Environmental Engineering<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext">
Bldg-sim [<a class="moz-txt-link-freetext" href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Maria Karpman<br>
<b>Sent:</b> Tuesday, June 23, 2015 12:02 PM<br>
<b>To:</b> 'Jeff Haberl'; 'Joe Huang';
<a class="moz-txt-link-abbreviated" href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Energy model calibration
- normalizing the utility bills to month start-end<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hello
all,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We
usually do the following to calibrate model to monthly
utility bills:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span
style="mso-list:Ignore">1)<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Create
or purchase weather file corresponding to pre-retrofit
period for which we have billing data. Lately we’ve been
using WeatherAnalytics files, which we found to be more cost
effective than creating our own (they charge $40 for an
annual file).<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span
style="mso-list:Ignore">2)<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Run
simulation using this weather file instead of TMY.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span
style="mso-list:Ignore">3)<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Standard
simulation reports (we typically use eQUEST) show usage by
calendar month (e.g. January, February, etc.) which is
usually not aligned with dates of utility bills, as noted in
the question that started this thread. As Brian mentioned in
one of the earlier posts, this may be circumvented by
entering the actual meter read dates into eQUEST as shown in
the screenshot below. This will align usages shown in
eQUEST’s “E*” reports such as ES-E with the actual utility
bills. The approach does not allow entering more than one
read date per month (e.g. we can’t capture April 3 – 28
bill). For projects where this limitation is an issue we
generate hourly reports that show consumption by end use for
each meter in the project, and aggregate it into periods
that are aligned with utility bills.
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img
id="Picture_x0020_1"
src="cid:part1.04070904.00090904@whiteboxtechnologies.com"
height="330" width="444"><o:p></o:p></span></p>
<p class="MsoListParagraph"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span
style="mso-list:Ignore">4)<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We
then copy simulation outputs (either from ES-E or hourly
reports, depending on the method used) into a standard
spreadsheet with utility data. The spreadsheet is set up to
plot side by side monthly utility bills and simulated usage,
and also calculates normalized mean bias error (NMBE) and
variance CV(RMSE). <o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><span
style="mso-list:Ignore">5)<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">If
we did not to where we want to be with NMBE and CV(RMSE) we
adjust and re-run the model, and re-paste results into the
same spreadsheet.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">In
my experience regression analysis using weather as
independent variable (i.e. running model with TMY file and
normalizing for difference in weather) or relying on HDD
to allocate usage to billing periods can be very
misleading, mainly because on many projects weather is not
the main driver of consumption. For example energy usage
of a school during a given time period depends much more
on vacation schedule than outdoor dry bulb temperatures. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">--
<o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#666666">Maria
Karpman
</span></b><span
style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#666666">LEED
AP, BEMP, CEM</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#666666">________________</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Verdana",sans-serif;color:#666666">Karpman
Consulting<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#666666"><a
moz-do-not-send="true"
href="http://www.karpmanconsulting.net/">www.karpmanconsulting.net</a>
</span><span
style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#666666">Phone </span><span
style="font-size:7.5pt;font-family:"Helvetica",sans-serif;color:#666666;background:white">860.430.1909 </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#666666">41C
New London Turnpike</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#666666">Glastonbury,
CT 06033</span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:windowtext">
Bldg-sim [<a moz-do-not-send="true"
href="mailto:bldg-sim-bounces@lists.onebuilding.org">mailto:bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Jeff Haberl<br>
<b>Sent:</b> Tuesday, June 23, 2015 10:16 AM<br>
<b>To:</b> Joe Huang; <a moz-do-not-send="true"
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Energy model calibration
- normalizing the utility bills to month start-end<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Hello
Joe,<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">Yes,
you can count the degree days and regress against that to
show a correlation. However, one will get a better "fit"
to the weather data if you regress to the degree day that
is calculated for the balance point temperature of the
building -- hence the inverse model toolkit or the
variable based degree day method.<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">PRISM
actually calculates the degree days to a variety of change
points and actually provides a table for each location
that you use as a look up. The IMT will actually perform a
variable based degree day calculation that agrees well
with PRISM. IMT will also provide you with the average
daily temperature for the billing period.<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black">When
using DOE-2 for actual billing periods, one will have to
extract the appropriate hourly variable, sum it to daily
and then regroup to align with the billing periods. Here's
a chunk of code that will create a dummy plant, display
PV-A, PS-A, PS-E and BEPS, and extract the relevant hourly
variables to normalize the BEPS to the utility bills:<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">INPUT
PLANT ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">PLANT-REPORT
VERIFICATION = (PV-A)<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
PV-A, EQUIPMENT SIZES<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">SUMMARY
= (PS-A,PS-E,BEPS)<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
PS-A, PLANT ENERGY UTILIZATION SUMMARY<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
PS-E, MONTHLY ENERGY END USE SUMMARY<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
BEPS, BUILDING ENERGY PERFORMANCE SUMMARY<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">HVAC=PLANT-ASSIGNMENT
..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
EQUIPMENT DESCRIPTION<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
ELECTRIC DOMESTIC WATER HEATER<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">BOIL-1
=PLANT-EQUIPMENT TYPE=ELEC-DHW-HEATER SIZE=-999 ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
ELECTRIC HOT-WATER BOILER<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">BOIL-2
=PLANT-EQUIPMENT TYPE=ELEC-HW-BOILER SIZE=-999 ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
HERMETICALLY SEALED CENT CHILLER<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">CHIL-1
=PLANT-EQUIPMENT TYPE=HERM-CENT-CHLR SIZE=-999 ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
Graphics block for Data Processing ***<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">RP-3
= SCHEDULE THRU DEC 31 (ALL) (1,24) (1) ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
8 = Total PLANT heating load (Btu/h)<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
9 = Total PLANT cooling load (Btu/h)<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">$
10 = Total PLANT electric load (Btu/h)<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">BLOCK-3-1
= REPORT-BLOCK<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">VARIABLE-TYPE
= PLANT<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">VARIABLE-LIST
= (8,9,10) ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">BLOCK-3-2
= REPORT-BLOCK<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">VARIABLE-TYPE
= GLOBAL<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">VARIABLE-LIST
= (1) ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">HR-3
= HOURLY-REPORT<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">REPORT-SCHEDULE
= RP-3<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">REPORT-BLOCK
= (BLOCK-3-1,BLOCK-3-2) ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">END
..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">COMPUTE
PLANT ..<o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">STOP
..<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"> <o:p></o:p></span></p>
<div>
<div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:blue">8=!
8=) :=) 8=) ;=) 8=) 8=( 8=) 8=() 8=) 8=|
8=) :=') 8=) 8=?<br>
Jeff S. Haberl,
Ph.D.,P.E.inactive,FASHRAE,FIBPSA,......<a
moz-do-not-send="true"
href="mailto:........jhaberl@tamu.edu">jhaberl@tamu.edu</a><br>
Professor........................................................................Office
Ph: 979-845-6507<br>
Department of
Architecture............................................Lab
Ph:979-845-6065<br>
Energy Systems
Laboratory...........................................FAX:
979-862-2457<br>
Texas A&M
University...................................................77843-3581<br>
College Station, Texas, USA,
77843.............................http://esl.tamu.edu<br>
8=/ 8=) :=) 8=) ;=) 8=) 8=() 8=) :=) 8=)
8=! 8=) 8=? 8=) 8=0<o:p></o:p></span></p>
</div>
</div>
</div>
<div>
<div class="MsoNormal" style="text-align:center"
align="center">
<hr align="center" size="2" width="100%">
</div>
<div id="divRpF51553">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma",sans-serif">
Bldg-sim [<a class="moz-txt-link-abbreviated" href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>] on
behalf of Joe Huang [<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>]<br>
<b>Sent:</b> Monday, June 22, 2015 9:17 PM<br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Energy model
calibration - normalizing the utility bills to month
start-end</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Maybe
I'm missing something here, but why can't you just count
up the degree days for the utility period?<br>
I hope you're not working with average or "typical year"
degree days, but the degree days from the same time
period.<br>
<br>
I also recall that the old Princeton Scorekeeping Method
(PRISM) back in the 1980's allows the user to enter the
degree days for that time period, so it's not a new
problem.<br>
<br>
Joe<br>
<br>
<o:p></o:p></p>
<pre>Joe Huang<o:p></o:p></pre>
<pre>White Box Technologies, Inc.<o:p></o:p></pre>
<pre>346 Rheem Blvd., Suite 205A<o:p></o:p></pre>
<pre>Moraga CA 94556<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:yjhuang@whiteboxtechnologies.com" target="_blank">yjhuang@whiteboxtechnologies.com</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://weather.whiteboxtechnologies.com" target="_blank">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data<o:p></o:p></pre>
<pre>(o) (925)388-0265<o:p></o:p></pre>
<pre>(c) (510)928-2683<o:p></o:p></pre>
<pre>"building energy simulations at your fingertips"<o:p></o:p></pre>
<div>
<p class="MsoNormal">On 6/22/2015 6:09 AM, Jones,
Christopher wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">When calibrating an energy model
to utility bills the utility bills often don’t align
with the month start and end. I have reviewed a
couple methods to calendar normalize the utility
bills but find them somewhat unsatisfactory.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">For example the method I am
looking at does the following:<o:p></o:p></p>
<p class="MsoNormal">The April gas bill runs from
March 25 – April 24. The algorithm takes the
average number of m3 per day from that bill, applies
it to the days in April. Then it takes the average
number of days from the May bill which runs from
April 24 – May 25 and applies that average to the
remaining days in April. <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The issue is that the March-April
period has much higher HDD than the April-May period
and the “normalized” gas usage is significantly
lower than the simulation data for April.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am wondering if there are any
papers or other sources of information as to how
others approach this problem.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><img
id="Picture_x0020_2"
src="cid:part9.07000908.02060004@whiteboxtechnologies.com"
alt="cid:image003.png@01D09C46.E75BA0D0"
border="0" height="43" width="108"></span><o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1C467A">Christopher
Jones,</span></b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">P.Eng.<i>
<br>
</i></span><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">Senior Engineer</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">WSP Canada Inc.</span></b><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">2300 Yonge Street, Suite 2300</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">Toronto, ON M4P 1E4</span><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#595959"
lang="EN-CA"><br>
</span><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">T +1 416-644-4226</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">F +1 416-487-9766</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
lang="EN-CA">C +1 416-697-0065</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"
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href="http://www.wspgroup.com/"
target="_blank">www.wspgroup.com</a>
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