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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Matt,<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">Calibrating a baseline model to ACTUAL utility usage requires detective work and forensics to make sure your model reasonably represents the ACTUAL building
(construction, systems, internal loads, operating schedules, equipment efficiency, etc.) as much as possible. The more data you have, the better. Although eQUEST suggests many good default values, ACTUAL might vary significantly.<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><u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Ideally</span></u></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">, you will have the benefit of a good building energy
audit with the following:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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">Construction verified against building drawings<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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">Lighting surveyed on a room-by-room basis, scheduling information from the operating staff, data loggers, after hours observation, or DDC trend logs<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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">Misc. equipment surveyed or number of computers, copiers, nameplate data, etc. provided to you. If you can only get model # and qty., you may have
to research the electrical ratings. Scheduling information similar to lighting also applies.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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">HVAC equipment surveyed not only for nameplate data, but a physical evaluation of the unit – filters, blowers, OA, RA, MA, SA, space temperatures
measured, economizer dampers working or linkages disconnected or dampers closed/screwed shut, air flow measurements or balance report, coils (cleanliness, fins straight/crushed over, air-cooled condensers degraded due to corrosion from salt-air exposure or
pollution which reduces cooling efficiency). You also want to know how equipment is scheduled and the hours of operation. This could be anecdotal information from the operating staff, DDC trend logs, data loggers, after hours observation.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<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">Central plant equipment surveyed and a physical evaluation of the equipment. These include but are not limited to boiler stack temps, HHW, temps/steam
pressure, boiler combustion efficiency test or most recent test report, operating schedules, condition of steam traps, how chillers & boilers are sequenced, chilled & condenser water temps, check chiller approaches for signs of potential condenser fouling
or low refrigerant charge.<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">If you have the benefit of a building audit, you will be in a better position to define your model to reflect ACTUAL as much as possible and adjust inputs based
on measurements, observations, or trend log/logger data. By the way, a good audit is not limited to the items listed above.<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">Now, if the building is on a different coast and it’s not possible to perform an audit, you need to have building drawings and a maintenance & operations contact
to obtain anecdotal information from at a minimum. Ask questions about the items listed above to get as much information as possible. You’ll then have to play detective to fill in some of the holes in the information needed. For example, if you’re told
that HVAC equipment is controlled by a programmable thermostat, find out what type. Unless it’s like some of the more recent types that can maintain start/stop times in memory without a battery backup, chances are that it uses batteries. 9 out of 10 times,
these are out of sight, out of mind and the batteries are dead and the programmed time schedules have been lost. Another example is if the customer has an air-cooled chiller or rooftop package unit located in a coastal environment, there are very good chances
that the condenser is degraded and the fins might crumble like crackers. I’ve measured chillers with a new, off-the-shelf cooling efficiency of 1.15 kW/ton, however, the condensers were so bad, the measured efficiency was as bad as 2.5 kW/ton.<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">Make sure you are using a weather file appropriate for the building location. Remember that the weather files are representative of long-term weather and the
ACTUAL energy usage data you have might be from an abnormal year. Before I forget, use Google Earth to look at the building for things like shading from other buildings or trees, get an idea of % glazing, wall and roof colors, or air-cooled HVAC equipment
or cooling towers hidden within an enclosure with tight clearances causing the units to be starved for air or recirculation of hot air discharged from the condenser or tower.<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">Sometimes, I’ve had to build a model with only knowledge of the square footage and age of the building. That’s when you need to make educated guesses about
insulation, lighting power densities, equipment efficiencies, etc. based on the age of the building.<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">Sorry for the long-winded dissertation, but if you make the appropriate tweaks in your calibration, you should be able to get to ±7.5%-10% of actual consumption,
which is generally considered acceptable that the model reasonably describes the building energy usage.<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">Good luck,<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">Mike Busman<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:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D">Michael R. Busman, CEM</span></b><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:"Verdana","sans-serif";color:#1F497D">Lead Project Engineer II</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:"Calibri","sans-serif";color:#1F497D"> <o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D">Chevron Energy Solutions</span></b><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:"Verdana","sans-serif";color:#1F497D">A Division of Chevron U.S.A., Inc.</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:"Verdana","sans-serif";color:#1F497D">145 S. State College Blvd.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D">Brea, CA 92821
</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:"Verdana","sans-serif";color:#1F497D">Direct 714-671-3561</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:"Verdana","sans-serif";color:#1F497D">Fax 714-671-3438</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:"Verdana","sans-serif";color:#1F497D">eFax 866-420-0335 (Include my Full Name followed by "CAI:MHTZ" on Cover Sheet)</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:"Verdana","sans-serif";color:#1F497D">Mobile 310-387-2083</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:"Verdana","sans-serif";color:#1F497D"><a href="mailto:mbusman@chevron.com"><span style="color:blue">mbusman@chevron.com</span></a></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:"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>
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<p class="MsoNormal"><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""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>-Matt<br>
<b>Sent:</b> Wednesday, January 30, 2013 12:02 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Matching to utility provided bill/usage<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">First time sending to this forum.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Quick question: <br>
It's great when I am provided the utility usage (kWh and Therms) for a building but my models always start really far off and I often am not sure what to do to correct it. Since I have ACTUAL usage, is there any way to refine the model to match it? I'm guessing
it's just too open ended to do it automatically; If I selected the wrong system or insulation or windows... it won't know which to correct.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Again, sorry if this isn't the proper way to submit, I'm not used to such a 'simple' forum :)<o:p></o:p></p>
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