<div>There is a ASHRAE guideline that outlines the metrics for deciding when the model is calibrated - ASHRAE guideline 14. Also it is alluded to by the RMI modelling workshop slides. The CVRMSE is around 10%, and the monthly ERR is 15%. I usually look at these numbers for electric and gas separately.</div>
<div>How many people follow the ASHRAE guideline for calibration and are there any other metrics out there?</div><div> </div><div>Thanks</div><div>-Rohini<br><br></div><div class="gmail_quote">On Thu, Apr 28, 2011 at 12:48 PM, Katherine Louman-Gardiner <span dir="ltr"><<a href="mailto:klgardiner@flowgroup.ca">klgardiner@flowgroup.ca</a>></span> wrote:<br>
<blockquote style="margin: 0px 0px 0px 0.8ex; padding-left: 1ex; border-left-color: rgb(204, 204, 204); border-left-width: 1px; border-left-style: solid;" class="gmail_quote">
<div lang="EN-CA" vlink="purple" link="blue">
<div>
<p class="MsoNormal">Hi All,</p>
<p class="MsoNormal">Our client would like us to produce an eQuest model that</p>
<p><span>a)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>Can be easily adjusted to include current and recently
recorded weather data</p>
<p><span>b)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>Can be easily adjusted to reflect space occupancies and
lighting loads</p>
<p><span>c)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>Will reflect the actual building energy usage to within
1%</p>
<p class="MsoNormal">Do any of you have experience trying to validate models like
this? </p>
<p class="MsoNormal">My concern is that models are approximations, and will not
account for small changes in occupancy, outdoor weather, etc. </p>
<p class="MsoNormal">I guess my questions are these:</p>
<p><span>1)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>Even if I manage to put in daily occupant and fan
schedules based on actual use, will the model be accurate enough to take me
within 1%?</p>
<p><span>2)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>We have been asked to remove plug loads (both for
consumption purposes and cooling loads). Will this be too big of an
assumption to get any accuracy out of the model in the future?</p>
<p><span>3)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>How do I modify the weather input file?</p>
<p><span>4)<span style="font: 7pt/normal "Times New Roman"; font-size-adjust: none; font-stretch: normal;">
</span></span>Are there any other ideas I’m missing that will
help us validate a model as an absolute measure of actual building energy
consumption?</p>
<p class="MsoNormal">Thank you for your help,<br>
Katherine</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Katherine Louman-Gardiner, EIT</p>
<p class="MsoNormal">Mechanical Engineer</p>
<p class="MsoNormal"> </p>
</div>
</div>
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