Check your cfm/sf number in your systems, that would definitely cause this if it's set too high. Also what field are you using for your OA ventilaton? <br><br>Carol<br><br><div class="gmail_quote">On Wed, Apr 6, 2011 at 12:22 PM, M. Shields <span dir="ltr"><<a href="mailto:mshields@fstrategies.com">mshields@fstrategies.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal">Hi all,</p><p class="MsoNormal"> </p><p class="MsoNormal">
I am in the process of breaking out the fan energy from my HVAC system per ASHRAE 2004 G3.1.2.1, following G3.1.2.9. The amount of energy coming from my fans seems massive and I’m not sure if that is typical, or if I’ve messed something up. I started by setting the temperature difference of 20 degrees between supply and desired temp (55/75 cooling and 90/70 for heating) and specified 62.1-2004 ventilation for outside air. I then ran equest and used the SV-A reports to get supply CFM for each system. From that number I then used Table G3.1.2.9 to get BHP for each system, which I then converted to kW using the formula in ASHRAE. I then took that number and divided by CFM to get kw/CFM and entered this number on the system->fan tab. When I go to the SV-A report the system kW is exactly what I calculated it to be, but the energy required for my ventilation fans is about the same as my heating and cooling load combined, which seems outrageous. </p>
<p class="MsoNormal"> </p><p class="MsoNormal">Is this typical? Have I entered it In the wrong way? I would think fan consumption would typically be a fraction of the actually heating and cooling energy. Thanks for any thoughts.</p>
<p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Book Antiqua","serif"">____________________________<br>Michael Shields<br>Facility Strategies Group, LLC</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Book Antiqua","serif"">1012 Market Street, Suite 307</span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Book Antiqua","serif"">Fort Mill, SC 29708</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Book Antiqua","serif"">Phone: <a href="tel:803-493-4507" value="+18034934507" target="_blank">803-493-4507</a></span><span style="font-size:10.0pt;font-family:"Book Antiqua","serif""></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Book Antiqua","serif"">Fax: <a href="tel:803-548-2511" value="+18035482511" target="_blank">803-548-2511</a><br>Email: <a href="mailto:mshields@fstrategies.com" target="_blank"><span style="color:blue">mshields@fstrategies.com</span></a></span></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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