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<p class="MsoNormal"><span style="color:#1F497D">Hi Daniel,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">My initial reaction is that if the fan is running to maintain temperature control in the summer, reducing outside air infiltration means overall the fan has to work harder? As you are getting less free cooling
when the temperature outside is less than inside.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Maybe you could check the temperature set points and see if that makes a difference.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Matt<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#595959"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#595959"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="color:#1D477B">Matthew Harris <br>
</span></b><b><span style="font-size:9.0pt;color:#595959">Halsall Associates <br>
</span></b><span style="font-size:9.0pt;color:#595959">Tel: 416.644.2889</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Daniel Kaler [mailto:DanielK@mepassociates.com]
<br>
<b>Sent:</b> January 10, 2012 5:15 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Infiltration and Increased Fan Energy<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT"">I am modeling an older greenhouse, assuming an infiltration rate of 3 ACH. The building will be upgrading all of the windows and as a result will also reduce the leakage rates. For modeling
purposes, I am taking infiltration rates out of 2011 ASHRAE Handbook HVAC Applications. The greenhouse has perimeter steam radiation and no cooling. However, there is a ventilation fan for summer use to keep air moving through the building. I ended up modeling
this as system heating/ventilation system with no heating coils installed, baseboard radiation, and an economizer to quantify the summer ventilation rates.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT"">For the analysis, I created two parametric runs. One parametric run varied the glass characteristics. The second parametric run varied the glass characteristics and reduced the infiltration
rate to 1 ACH. Parametric run 1, show the expected fan energy consumption, operating the summer months, and periodically during the shoulder months. However, parametric run two showed the fan operating year round at roughly the same energy consumption each
month. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT"">I do not have the baseboard heat scheduled; I am allowing the system to vary with changing load. Does anyone know why reducing my infiltration rate will cause the ventilation fan energy
consumption to increase?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT"">Thank you.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Optima LT""><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Optima LT";color:#1A2A6C">Daniel Kaler<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-family:"Optima LT";color:#1A2A6C">Energy Engineer, EIT<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:6.0pt;font-family:"Optima LT";color:#1A2A6C"><o:p> </o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span lang="EN-US" style="font-size:12.0pt;font-family:"Optima LT";color:#1A2A6C">MEP ASSOCIATES<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Optima LT";color:black">engineers | consultants | commissioning<o:p></o:p></span></b></p>
<p class="MsoNormal" align="center" style="text-align:center"><span lang="EN-US" style="font-size:8.0pt;font-family:"Optima LT";color:black">MEP Associates, LLC | 2720 Arbor Court | Eau Claire, WI 54701<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span lang="EN-US" style="font-size:8.0pt;font-family:"Optima LT";color:black">Phone: 715.832.5680 | Fax: 715.832.5668 |www.mepassociates.com</span><span lang="EN-US" style="font-size:8.0pt;font-family:"Optima LT""><o:p></o:p></span></p>
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