Hi Cam,<div><br></div><div>This is so nice of you, I really appreciate your efforts in for clearing my concepts and helping me out. This is really useful.</div><div><br></div><div>Here by I want to share some of the very useful links for energy modelers.</div>
<div><br></div><div><a href="http://energy-models.com/tools/leed-fan-calculator">http://energy-models.com/tools/leed-fan-calculator</a></div><div><a href="http://www.gbci.org/files/leedonline/Advanced_Energy_Modeling_for_LEED_V2_1c.pdf">http://www.gbci.org/files/leedonline/Advanced_Energy_Modeling_for_LEED_V2_1c.pdf</a></div>
<div><a href="http://www.rmi.org/ModelingTools">http://www.rmi.org/ModelingTools</a></div><div><a href="http://www.rmi.org/Content/Files/EMIT%20User's%20Guide.pdf">http://www.rmi.org/Content/Files/EMIT%20User's%20Guide.pdf</a></div>
<div><br></div><div>Thank you Mr. Nick, if initial clarification.</div><div><br></div><div>Thank you,</div><div>Vamshi</div><div><br></div><div><br></div><div><br><br><div class="gmail_quote">On Tue, Mar 26, 2013 at 6:28 PM, Cam Fitzgerald <span dir="ltr"><<a href="mailto:cam@energyopportunities.com" target="_blank">cam@energyopportunities.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">So you are still confused. Hope this clarifies the process for you:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">1. Example baseline fan power distribution calculations (other methods are acceptable, but this is one of the most common approaches)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Proposed system:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Total fan kW (20+18+2.5=40.5 kW)<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Design supply fan percent of total power (20/40.5=0.494)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Design return fan percent of total power (18/40.5=0.444)<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Design exhaust fan percent of total power (2.5/40.5=0.062)<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Baseline supply airflow calculated per Section G3.1.2.8 (Note: rarely a nice round number, but I will use your number for this example) – 30,000 cfm<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Assuming the baseline system is VAV (system types 5 – 8), and using a pressure drop adjustment factor of 0.5 IWC (MERV 12 filter) , calculated system fan power is 34.196 kW<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Using the same ratios as the Proposed system, the Baseline fan power would be: 16.893 kW supply; 15.183 kW return; and 2.120 kW exhaust. (16.893+15.183+2.12=34.196)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You can use this power to determine the kW/cfm for each fan.<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">2. The supply fan may slightly increase the supply temperature, but this is usually minimal and does not significantly impact the supply air temperature.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">3. The baseline case prior to rotation should be used.<u></u><u></u></span></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">4. See response to #1.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Good luck!<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cam<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<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"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> vamshi ranga [mailto:<a href="mailto:vamshiranga@gmail.com" target="_blank">vamshiranga@gmail.com</a>] <br>
<b>Sent:</b> Tuesday, March 26, 2013 8:07 AM<br><b>To:</b> Cam Fitzgerald<br><b>Cc:</b> Nick Caton; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a></span></p><div>
<div class="h5"><br><b>Subject:</b> Re: [Equest-users] Baseline Fan power calculation<u></u><u></u></div></div><p></p></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Hi,<u></u><u></u></p>
<div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Thanks, but it is difficult to understand (some confusion). Let's say the Proposed system has following specifications<u></u><u></u></p></div>
<div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Supply fan cfm = 40000<u></u><u></u></p></div><div><p class="MsoNormal">Supply fan Wattage = 20000<u></u><u></u></p></div><div><p class="MsoNormal">
Return fan cfm = 35000<u></u><u></u></p></div><div><p class="MsoNormal">Return fan Wattage = 18000<u></u><u></u></p></div><div><p class="MsoNormal">Filter used = MERV 12<u></u><u></u></p></div><div><p class="MsoNormal">Exhaust fan cfm = 5000<u></u><u></u></p>
</div><div><p class="MsoNormal">Exhaust fan Wattage = 2500<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">And Baseline (0 deg orientation) has following specifications when simulated with default fan kW/cfm and 20 deg F difference,<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><div><p class="MsoNormal">Supply fan cfm = 30000<u></u><u></u></p></div><div><p class="MsoNormal">Supply fan Wattage = 15000<u></u><u></u></p></div><div><div><p class="MsoNormal">
Return fan cfm = 25000<u></u><u></u></p></div><div><p class="MsoNormal">Return fan Wattage = 13000<u></u><u></u></p></div></div></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">1. Please tell me how to distribute kW/cfm in basecase and from where will I get baseline default exhaust specification?<u></u><u></u></p>
</div><div><p class="MsoNormal">2. Won't the change in baseline when we input calculated value in eQUEST due to heat gain<u></u><u></u></p></div><div><p class="MsoNormal">3. Should we take all the 4 orientations average cfm for calculating baseline cfms<u></u><u></u></p>
</div><div><p class="MsoNormal">4. Tell me how to calculate baseline fan power from above values<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">If, this example is confusing. I request you to give your own example for understanding.<u></u><u></u></p>
</div><div><p class="MsoNormal">I have been having doubt related to fan power calculation. I am eager to learn how to do it properly to avoid any GBCI comments.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p>
</div><div><p class="MsoNormal">Your valuable time put in resolving my doubt is appreciated.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Thanks,<u></u><u></u></p></div>
<div><p class="MsoNormal">Vamshi.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">On Tue, Mar 26, 2013 at 3:23 PM, Cam Fitzgerald <<a href="mailto:cam@energyopportunities.com" target="_blank">cam@energyopportunities.com</a>> wrote:<u></u><u></u></p>
<div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">All,</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It seems there is much confusion on this issue. The Proposed fans are all modeled explicitly (with the fan power as designed). In the Baseline case each HVAC system fan power (Section G3.1.2.9) is calculated using the supply airflow (Section G3.1.2.8) based on 20 F space to supply air temperature difference. If the Proposed system uses multiple fans, then the calculated system fan power is distributed among the fans in the Proposed design. Appendix G does not provide any guidance for how this power should be distributed among the system fans in the Baseline system, but usually projects use the same proportion of the total system fan power as the Proposed design. All the fan power can be modeled as a single supply fan, but that will apply all the heat gain from the fan to the supply airstream which may not be realistic for large systems. Note that exhaust fans in the Proposed design that operate continuously during occupied periods are considered part of the system and their power is included in the calculated Baseline fan power. Exhaust fans that operate intermittently are considered a process load and must be modeled identically in both cases. If the Proposed process exhaust fan motor is larger than one HP, the motor efficiency is regulated by Section 10 and savings may be claimed for using high efficiency motors as compared to the minimum efficiency from Table 10.8.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hope this helps!</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Cam Fitzgerald</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Energy Opportunities/a 7group company</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<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"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>vamshi ranga<br>
<b>Sent:</b> Tuesday, March 26, 2013 3:27 AM<br><b>To:</b> Nick Caton<br><b>Cc:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Equest-users] Baseline Fan power calculation</span><u></u><u></u></p>
</div><div><div><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Dear Nick Caton,<u></u><u></u></p><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Thank you very much for valuable inputs, from this it is clear that, <u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">1. However there are different motors used in Proposed case for supply, return and exhaust with different kW/cfm, we need to use one single motor in with one kW/cfm in baseline case<u></u><u></u></p>
</div><div><p class="MsoNormal">2. In EAp2 Section 1 4 Tables of LEED under "Table 1.4.2", it asks for separate wattage of supply, return and exhaust fans in baseline case, So, there we need to enter as "Not Applicable"<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Please let me know if my understanding is wrong.<u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">
Thanks,<u></u><u></u></p></div><div><p class="MsoNormal">Vamshi.<u></u><u></u></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"> <u></u><u></u></p><div><p class="MsoNormal">On Mon, Mar 25, 2013 at 8:04 PM, Nick Caton <<a href="mailto:ncaton@smithboucher.com" target="_blank">ncaton@smithboucher.com</a>> wrote:<u></u><u></u></p>
<div><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Vamshi,</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I advise carefully reviewing the footnotes under Table 6.5.3.1.1A, which include procedure for determining baseline fan power adjustments.</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">1.</span><span style="font-size:7.0pt;color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">P<sub>fan</sub> represents the sum power of all fans in a given baseline system (with exception to baseline systems #6/#8, fan powered VAV boxes).</span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">2.</span><span style="font-size:7.0pt;color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Again, there is not a separate supply/return power calculation (see answer #1). You can however account for adjustments present in separate airstreams from the proposed design. </span><u></u><u></u></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">3.</span><span style="font-size:7.0pt;color:#1f497d"> </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Probably not. Review the difference between CFM<sub>S</sub> and CFM<sub>D</sub> carefully at the cited Table. A CFM quantity representing the airflow each element encounters (CFM<sub>D</sub>) should be applied against each pressure drop adjustment, not an ‘aggregate’ of supply+return. </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">You may also find the attached resource published by 7group helpful to cement your procedural understanding of how to arrive at the sum total for “A.” </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Regards,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">~Nick</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><img border="0" width="119" height="37" src="cid:image001.jpg@01CE29FD.4C30BBD0" alt="cid:489575314@22072009-0ABB"></span><u></u><u></u></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2d4d5e"> </span></b><u></u><u></u></p><p class="MsoNormal"><b><span style="font-family:"Stylus BT","sans-serif";color:#2d4d5e">NICK CATON, P.E.</span></b><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#cc9900">SENIOR ENGINEER</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#cc9900"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2d4d5e">Smith & Boucher Engineers</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2d4d5e">25501 west valley parkway, suite 200</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2d4d5e">olathe, ks 66061</span><u></u><u></u></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2d4d5e">direct <a href="tel:913.344.0036" target="_blank">913.344.0036</a></span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2d4d5e">fax <a href="tel:913.345.0617" target="_blank">913.345.0617</a></span><u></u><u></u></p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><a href="http://www.smithboucher.com" title="blocked::www.smithboucher.com" target="_blank"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue"> </span></u><u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span><u></u><u></u></p><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""> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>vamshi ranga<br>
<b>Sent:</b> Monday, March 25, 2013 8:17 AM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Baseline Fan power calculation</span><u></u><u></u></p>
<div><div><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Hi All,<u></u><u></u></p><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">I have a doubt regarding calculating fan power as per ASHRAE 90.1-2007.<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">My proposed system has, supply return and exhaust fans separately with kW and cfm mentioned for each fan.<u></u><u></u></p></div><div><p class="MsoNormal">
<u></u><u></u></p></div><div><p class="MsoNormal">So, for calculating baseline fan power, <u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">1. should I calculate it separately for each fan type? <u></u><u></u></p>
</div><div><p class="MsoNormal">2. can I take pressure drop adjustment both in supply and return fan power calculation?<u></u><u></u></p></div><div><p class="MsoNormal">3. should I sum all the cfms of supply, return and exhaust and than apply pressure drop adjustments to aggregated cfm.<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Kindly help me out in solving the doubt. If you have any example fan power calculations, or web links those could guide me regarding this, plz do share them.<u></u><u></u></p>
</div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Thanks in advance.<u></u><u></u></p></div><div><p class="MsoNormal"> <u></u><u></u></p></div><div><p class="MsoNormal">Regards,<u></u><u></u></p>
</div><div><p class="MsoNormal">Vamshi.<u></u><u></u></p></div></div></div></div></div></div><p class="MsoNormal"> <u></u><u></u></p></div></div></div></div></div></div><p class="MsoNormal"><u></u> <u></u></p></div></div>
</div></div></div></blockquote></div><br></div>