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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#17365D'>Alright,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#17365D'>So I have a question. When I input the airflow as explained but the capacity of the equipment comes up to be around 17% above of the original scheduled capacity. Would it raise a flag to the reviewer even though I’m getting 27% of energy savings even though this unit is oversized by 17% and the software is accounting for it?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#17365D'>Thanks.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><div><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>Catalina Caballero</span></b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>. AIA. Assoc., LEED GA.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>Sustainability Coordinator<o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:gray'><o:p> </o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>Johnson, Avedano, Lopez, Rodriguez & Walewski Engineering Group, Inc.<o:p></o:p></span></b></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#00B050'>Engineering for High Performance Buildings.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>MEPF - BIM - LEED - Cx<o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><br>2510 NW 97 Ave, Ste 220, Miami, FL 33172.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>P:</span></b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> 305.594.0660</span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'> </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> <b>Ext:</b> 217 </span><span style='font-size:9.0pt;color:black'>Ӏ</span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> <b>F: </b>305.594.0907 <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><u><span lang=IT style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><a href="http://www.jalrw.com"><span style='color:black'>www.jalrw.com</span></a></span></u><span lang=IT style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>|</span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'> </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><a href="ccaballero@jalrw.com%20"><span style='color:black'>ccaballero@jalrw.com</span></a> <o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 align=left style='border-collapse:collapse'><tr><td valign=top style='padding:0in 7.5pt 3.75pt 0in'></td></tr></table><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><a href="http://www.facebook.com/jalrw" 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Gothic","sans-serif";color:black'> </span><a href="https://plus.google.com/u/0/b/112470263254966771834/112470263254966771834/posts" target="_blank"><span style='font-family:"Century Gothic","sans-serif";color:black;text-decoration:none'><img border=0 width=25 height=28 id="_x0000_i1038" src="cid:image004.png@01CFE848.C6420AE0" alt="Google Plus"></span></a><span style='font-family:"Century Gothic","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:"Century Gothic","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-align:justify;text-autospace:none'><span style='font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black'>This email and any files transmitted with it are confidential and intended solely for the addressee.<o:p></o:p></span></p><p class=MsoNormal style='text-align:justify;text-autospace:none'><span style='font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black'>If you are not the named addressee you should not disseminate, distribute, copy, or alter this email.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black'>Please consider the environment before printing this email.</span><span style='font-family:"Century Gothic","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><div><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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Caballero, Catalina <br><b>Sent:</b> Tuesday, October 07, 2014 7:08 PM<br><b>To:</b> 'Scott Parker'; Dahlstrom, Aaron; Craig Gann; Steve Jacobs; trace-users@lists.onebuilding.org<br><b>Subject:</b> RE: [Trace-users] Load Calcs vs Energy Model for LEED - FieldNote:00028:ieOVB<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#17365D'>Great,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#17365D'>This really worked!<o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#17365D'>Thanks Scott.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><div><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>Catalina Caballero</span></b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>. AIA. Assoc., LEED GA.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>Sustainability Coordinator<o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:gray'><o:p> </o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>Johnson, Avedano, Lopez, Rodriguez & Walewski Engineering Group, Inc.<o:p></o:p></span></b></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#00B050'>Engineering for High Performance Buildings.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>MEPF - BIM - LEED - Cx<o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><br>2510 NW 97 Ave, Ste 220, Miami, FL 33172.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>P:</span></b><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> 305.594.0660</span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'> </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> <b>Ext:</b> 217 </span><span style='font-size:9.0pt;color:black'>Ӏ</span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> <b>F: </b>305.594.0907 <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><u><span lang=IT style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><a href="http://www.jalrw.com"><span style='color:black'>www.jalrw.com</span></a></span></u><span lang=IT style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'> </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'>|</span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:#17365D'> </span><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><a href="ccaballero@jalrw.com%20"><span style='color:black'>ccaballero@jalrw.com</span></a> <o:p></o:p></span></p></div><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 align=left style='border-collapse:collapse'><tr><td valign=top style='padding:0in 7.5pt 3.75pt 0in'></td></tr></table><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><a 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alt=Twitter></span></a><span style='font-family:"Century Gothic","sans-serif";color:black'> </span><a href="https://plus.google.com/u/0/b/112470263254966771834/112470263254966771834/posts" target="_blank"><span style='font-family:"Century Gothic","sans-serif";color:black;text-decoration:none'><img border=0 width=25 height=28 id="_x0000_i1028" src="cid:image004.png@01CFE848.C6420AE0" alt="Google Plus"></span></a><span style='font-family:"Century Gothic","sans-serif";color:black'> <o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-family:"Century Gothic","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal style='text-align:justify;text-autospace:none'><span style='font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black'>This email and any files transmitted with it are confidential and intended solely for the addressee.<o:p></o:p></span></p><p class=MsoNormal style='text-align:justify;text-autospace:none'><span style='font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black'>If you are not the named addressee you should not disseminate, distribute, copy, or alter this email.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black'>Please consider the environment before printing this email.</span><span style='font-family:"Century Gothic","sans-serif";color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#17365D'><o:p> </o:p></span></p><div><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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Scott Parker [<a href="mailto:sparker@aeieng.com">mailto:sparker@aeieng.com</a>] <br><b>Sent:</b> Tuesday, October 07, 2014 4:04 PM<br><b>To:</b> Dahlstrom, Aaron; Craig Gann; Steve Jacobs; Caballero, Catalina; <a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br><b>Subject:</b> RE: [Trace-users] Load Calcs vs Energy Model for LEED - FieldNote:00028:ieOVB<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>All,<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'>On the issue of fan sizing, here is what I have observed:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><u><span style='color:#1F497D'>There are two ways to oversize (or undersize) the air handler to match the installed capacity.<o:p></o:p></span></u></b></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='color:#1F497D'>1.</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Input airflow under block cooling airflow: Create Systems </span><span style='font-family:Wingdings;color:#1F497D'>à</span><span style='color:#1F497D'> Advanced<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='color:#1F497D'>2.</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Input coil capacity percentage with Capacity Units of “% of design capacity by adjusting airflow”<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'>Both of these do indeed make the unit larger, and they do this by increasing the airflow for each room by a proportional amount. This gets the fan the right size, but adds extra capacity on a room basis that does not exist. Then Trace uses this extra capacity in the hourly analysis. <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'>Actual numbers from one air handler on a current project:<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'>No oversizing:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Block CFM = 11,453 CFM (from Load-Airflow Summary report)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Sum of Peaks = 11,469 CFM (from Load-Airflow Summary report)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Fan size = 11,453 CFM (Equipment Energy Consumption Report)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><b><span style='color:#1F497D'>Peak hourly airflow = 10,570 CFM (from Visualizer)<o:p></o:p></span></b></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Manually input block airflow to match scheduled capacity:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Block CFM = 15,000 CFM (from Load-Airflow Summary report) – manually input<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Sum of Peaks = 15,000 CFM (from Load-Airflow Summary report)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Fan size = 15,000 CFM (Equipment Energy Consumption Report)<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-family:Symbol;color:#1F497D'>·</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><b><span style='color:#1F497D'>Peak hourly airflow = 11,469 CFM (from Visualizer)<o:p></o:p></span></b></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>When I manually input the block airflow it did increase the fan size, but when looking at the hourly results the actual hourly airflows increased as well since each room was given a proportional increase in CFM capacity to get to the right unit capacity. This extra capacity would be used for periods when the load exceeds the actual capacity for a short duration: cool down or when OA conditions are more extreme than used for the load calculation (design weather <> hourly weather data). Thus you cannot set the unit capacity separate from the room capacity in Trace (as far as I can tell). This partly solves the problem of getting the fan the right size, but the added capacity can have an unintended impact of cooling energy use or on fan power by allowing the room by room airflow to be higher than the actual system. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><u><span style='color:#1F497D'>The overall impact of the consequences of oversizing each room may not be significant, but you can run the model with and without a manual input for fan block airflow and see the impact on cooling, heating and fan power.</span></u></b><span style='color:#1F497D'> This does allow you to exactly match the unit CFM in Trace model which should keep the LEED reviewer happy.<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'>See below for screen shots of inputs (for oversized system) and Equipment Energy Consumption Report excerpt for oversized and non-oversized air handler in Trace. It does show the expected fan power savings for the oversized fan.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><img border=0 width=434 height=428 id="_x0000_i1029" src="cid:image005.png@01CFE848.C6420AE0"><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><img border=0 width=669 height=294 id="Picture_x0020_2" src="cid:image006.png@01CFE848.C6420AE0"><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><img border=0 width=884 height=375 id="_x0000_i1031" src="cid:image007.png@01CFE848.C6420AE0"><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'><tr><td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:105%'><b><span style='font-size:10.0pt;line-height:105%;color:#660000;text-transform:uppercase'>Scott Parker</span></b><span style='font-size:9.0pt;line-height:105%;color:#333333'> PE<br>LEED AP BD+C <br></span><span style='font-size:10.0pt;line-height:105%;color:black;text-transform:uppercase'>Mechanical</span><span style='font-size:9.0pt;line-height:105%;font-family:"Times New Roman","serif";color:#333333'><o:p></o:p></span></p></td><td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:105%'><span style='font-size:9.0pt;line-height:105%;color:#333333'> <o:p></o:p></span></p></td><td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:105%'><b><span style='font-size:9.0pt;line-height:105%;color:#660000'>AEI</span></b><span style='font-size:9.0pt;line-height:105%;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>1414 Raleigh Road, Suite 305 | Chapel Hill, NC 27517<br><br></span><span style='font-size:9.0pt;line-height:105%;color:#660000'>P: 919.419.9802 | F: 919.419.9803</span><span style='font-size:9.0pt;line-height:105%;color:#333333'> <br></span><span style='font-size:12.0pt;line-height:105%;font-family:"Times New Roman","serif";color:#1F497D'><a href="mailto:sparker@aeieng.com"><span style='font-size:9.0pt;line-height:105%;font-family:"Calibri","sans-serif";color:#660000;text-decoration:none'>sparker@aeieng.com</span></a></span><span style='font-size:9.0pt;line-height:105%;color:#660000'> | </span><span style='font-size:12.0pt;line-height:105%;font-family:"Times New Roman","serif";color:#1F497D'><a href="http://www.aeieng.com/"><b><span style='font-size:9.0pt;line-height:105%;font-family:"Calibri","sans-serif";color:#660000;text-decoration:none'>www.aeieng.com</span></b></a></span><span style='font-size:9.0pt;line-height:105%;color:#333333'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='color:windowtext'>From:</span></b><span style='color:windowtext'> Dahlstrom, Aaron [<a href="mailto:ADahlstrom@in-posse.com">mailto:ADahlstrom@in-posse.com</a>] <br><b>Sent:</b> Tuesday, October 07, 2014 1:44 PM<br><b>To:</b> Craig Gann; Scott Parker; Steve Jacobs; 'Caballero, Catalina'; <a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br><b>Subject:</b> RE: [Trace-users] Load Calcs vs Energy Model for LEED<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'>Scott/Craig – <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'>I have two ideas that might help get a workaround – it may not work on every system type, but it did on a FPVAV system I just experimented with:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-size:12.0pt;color:windowtext'>1.</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:windowtext'> </span><span style='font-size:12.0pt;color:windowtext'>To address Scott’s issue re: a the difference between block load and sum of peak zone CFMs, Trace offers an option to size the fan (and/or the main cooling coil) based on the sum of the peak airflows, rather than the block airflow. On the “Create Systems” dialog, “Advanced…” button there are fields that allow you to modify the parameter used to determine the fan size and the coil size (as below). Changing these from “block” to “peak” changed the flow of the “Tutorialtrc.trc” file from 16160 cfm sum of peaks / 13778 block cfm to 16160 sum of peaks / 16160 block CFM.<o:p></o:p></span></p><p class=MsoListParagraph><img border=0 width=382 height=318 id="_x0000_i1032" src="cid:image008.jpg@01CFE848.C6420AE0"><span style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='font-size:12.0pt;color:windowtext'>2.</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:windowtext'> </span><span style='font-size:12.0pt;color:windowtext'>On the Create Systems – Heating and Cooling Over-rides tab, the main cooling coil can be oversized by a specific percentage “by adjusting airflow.” I believe this would allow you to maintain the same discharge air temp and modify the system airflow as desired. It may not offer unconstrained combinations of leaving air temp, coil capacity, and system airflow, since Trace is auto calculating entering air conditions, but it may offer you an additional degree of freedom to get close at the system level:<o:p></o:p></span></p><p class=MsoListParagraph><img border=0 width=480 height=343 id="_x0000_i1033" src="cid:image009.jpg@01CFE848.C6420AE0"><span style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'>There may be unexpected consequences that make these ideas less than the best for your specific situations – but it seems like I’m able (at least in this case) to get the fan CFM to match the scheduled CFM, even if the load calc block load would show a different total CFM.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'>Hope this helps,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;color:windowtext'><o:p> </o:p></span></p><div><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>Aaron Dahlstrom, PE, LEED® AP</span></b><span style='color:windowtext'><o:p></o:p></span></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><b><span style='font-family:"AvantGarde Bk BT";color:#17365D'>In P</span></b><b><span style='font-family:"AvantGarde Bk BT";color:#619428'>o</span></b><b><span style='font-family:"AvantGarde Bk BT";color:#17365D'>sse</span></b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'> – </span><span style='font-size:8.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>A subsidiary of</span><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'> </span><b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:#CC0000'>AKF</span></b><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>| 1500 Walnut Street, Suite 1414, Philadelphia, PA 19102 </span><span style='color:windowtext'><o:p></o:p></span></p><p class=MsoNormal style='line-height:150%;text-autospace:none'><span style='font-size:9.0pt;line-height:150%;font-family:"Verdana","sans-serif";color:gray'>d: 215-282-6753| m: 267-507-5470| In Posse: 215-282-6800| AKF: 212-354-5656</span><span style='color:windowtext'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:gray'>e: <a href="mailto:ADahlstrom@in-posse.com">ADahlstrom@in-posse.com</a> | in posse web: <a href="http://www.in-posse.com/">www.in-posse.com</a> | akf web: </span><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:windowtext'><a href="www.AKFGroup.com">www.AKFGroup.com</a></span><span style='color:windowtext'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Times New Roman","serif";color:gray'> </span><span style='font-size:12.0pt;color:windowtext'><o:p></o:p></span></p><div><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";color:windowtext'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> Trace-users [<a href="mailto:trace-users-bounces@lists.onebuilding.org">mailto:trace-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Craig Gann<br><b>Sent:</b> Tuesday, October 07, 2014 12:55 PM<br><b>To:</b> Scott Parker; Steve Jacobs; 'Caballero, Catalina'; <a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Trace-users] Load Calcs vs Energy Model for LEED<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>I communicated with CDS about this a couple of months ago. It's a royal pain in the @#$ to do this! What you have to do is go to the rooms and manually enter the CFM for each room such that it totals up to the desired CFM at the system level. This means you have to first figure out which rooms are assigned to each system then figure out how much to change each room CFM such that it totals to what you want then print out the calculated room CFM values. Not easy if you have hundreds of rooms. I wound up putting it all in Excel so I could figure out a room CFM multiplier that changed each room CFM by the percentage needed. It took me a half day to mess with this and is a major deficiency in the Trace software IMHO.<br><br>Regards,<br><br>Craig J. Gann, P.E.; LEED AP<o:p></o:p></p><div><p class=MsoNormal>On 10/7/2014 11:18 AM, Scott Parker wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><p class=MsoNormal><span style='color:#1F497D'>I agree that the proposed system model should have the same capacity as the actual equipment. However, the challenge is that when you fix the leaving air temperature of the air handler (which matches typical design) then Trace does not allow any method for fixing the air handler CFM capacity. </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><b><u><span style='color:#1F497D'>For example, below I have just listed some numbers for reference to illustrate the point:</span></u></b><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Sum of Peaks = 19,458 CFM</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Block load = 18,902 CFM (actual maximum hourly airflow in Trace will typically be even less than this value)</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>AHU size = 20,000 CFM (scheduled on plans)</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>AHU size in trace = block load (18,902 CFM) – no way to force it to be 20,000 CFM.</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Therefore, when the air handler (in Trace) is at 18,902 CFM it is at peak fan power (i.e. top of fan curve). However, it actually is already part way down the true fan curve since the unit is scheduled for 20,000 CFM. If you use the theoretical fan laws, then the fan power at 18,902 CFM is 84% of the scheduled break horsepower - (18,902/20,000)^3 = 0.84 -- even though the fan is operating at 94.5% of peak fan power.</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>If anyone has a work around for this I would like to hear it. For me I have had to manually change the kW/CFM value to match the actual scheduled fan at the block airflow calculated in Trace.</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><div><table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'><tr><td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:105%'><b><span style='font-size:10.0pt;line-height:105%;color:#660000;text-transform:uppercase'>Scott Parker</span></b><span style='font-size:9.0pt;line-height:105%;color:#333333'> PE<br>LEED AP BD+C <br></span><span style='font-size:10.0pt;line-height:105%;color:black;text-transform:uppercase'>Mechanical</span><o:p></o:p></p></td><td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:105%'><span style='font-size:9.0pt;line-height:105%;color:#333333'> </span><o:p></o:p></p></td><td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='line-height:105%'><b><span style='font-size:9.0pt;line-height:105%;color:#660000'>AEI</span></b><span style='font-size:9.0pt;line-height:105%;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>1414 Raleigh Road, Suite 305 | Chapel Hill, NC 27517<br><br></span><span style='font-size:9.0pt;line-height:105%;color:#660000'>P: 919.419.9802 | F: 919.419.9803</span><span style='font-size:9.0pt;line-height:105%;color:#333333'> <br></span><span style='font-size:12.0pt;line-height:105%'><a href="mailto:sparker@aeieng.com"><span style='font-size:9.0pt;line-height:105%;color:#660000;text-decoration:none'>sparker@aeieng.com</span></a></span><span style='font-size:9.0pt;line-height:105%;color:#660000'> | </span><span style='font-size:12.0pt;line-height:105%'><a href="http://www.aeieng.com/"><b><span style='font-size:9.0pt;line-height:105%;color:#660000;text-decoration:none'>www.aeieng.com</span></b></a></span><span style='font-size:9.0pt;line-height:105%;color:#333333'> </span><o:p></o:p></p></td></tr></table><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p></div><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Trace-users [<a href="mailto:trace-users-bounces@lists.onebuilding.org">mailto:trace-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Steve Jacobs<br><b>Sent:</b> Tuesday, October 07, 2014 11:13 AM<br><b>To:</b> 'Caballero, Catalina'; <a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Trace-users] Load Calcs vs Energy Model for LEED<o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>Your proposed inputs need to match what is actually being installed in the building. If they are installing oversized equipment, you need to model oversized equipment. The model will account for part load efficiencies. </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in'><span style='color:#1F497D'>-</span><span style='font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D'> </span><span style='color:#1F497D'>Steve</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><div><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"'> Trace-users [<a href="mailto:trace-users-bounces@lists.onebuilding.org">mailto:trace-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Caballero, Catalina<br><b>Sent:</b> Tuesday, October 7, 2014 9:04 AM<br><b>To:</b> <a href="mailto:trace-users@lists.onebuilding.org">trace-users@lists.onebuilding.org</a><br><b>Subject:</b> [Trace-users] Load Calcs vs Energy Model for LEED</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Hello experts,<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>We <span style='font-size:10.0pt'>recently received comments back from LEED and one of the comments says the following: </span><o:p></o:p></p><p class=MsoNormal><i><span style='font-size:10.0pt'> </span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>It appears the equipment capacities (fan volume, fan power, cooling capacity, etc.) for the HVAC systems in the Proposed model</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>are inconsistent with the equipment capacities in the actual design when comparing the LEED Energy Performance Summary Report</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>to the mechanical schedules provided for PIf4: Schedule and Overview Documents</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>G3.1.10 in the Proposed building column requires that the Proposed model reflect all HVAC systems at actual equipment capacities</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>and efficiencies. The HVAC equipment capacities cannot be autosized in the Proposed model. Revise the Proposed model to reflect</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>all HVAC systems at actual equipment capacities. In addition, update Table 1.4.7B, and provide a revised LEED Energy Performance</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>Summary Report and the System Enterd Values reports for the Proposed model reflecting the changes. Further, if the equipment</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;color:#444444'>capacities and efficiencies are based on updated mechanical schedules and/or HVAC submittal sheets, provide the updated</span></i><o:p></o:p></p><p class=MsoNormal><i><span style='font-size:10.0pt;color:#444444'>mechanical schedules and/or HVAC submittal sheets.</span></i><o:p></o:p></p><p class=MsoNormal><i><span style='font-size:10.0pt;color:#444444'> </span></i><o:p></o:p></p><p class=MsoNormal><span style='color:red'>The only question that I have is why would they require for the airflows, to be exactly the same, to the original load calculations when the load calculations looks for the worst case scenario (using ashrae basic envelope, lighting, values), while the energy model looks for the most energy efficient model (actual installed envelope, occupancy, etc). It make sense that they are looking for something similar but it’s definitely not going to match the capacities and or airflows, (load calcs tend to be oversized).</span><o:p></o:p></p><p class=MsoNormal><span style='color:red'> </span><o:p></o:p></p><p class=MsoNormal>I would greatly appreciate your opinion.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal>Thanks.<o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt'>Catalina Caballero</span></b><span style='font-size:9.0pt'>. AIA. Assoc., LEED GA.</span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt'>Sustainability Coordinator</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt'> </span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt'>Johnson, Avedano, Lopez, Rodriguez & Walewski Engineering Group, Inc.</span></b><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt'>Engineering for High Performance Buildings.</span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:9.0pt'>MEPF - BIM - LEED - Cx</span></i><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt'><br>2510 NW 97 Ave, Ste 220, Miami, FL 33172.</span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:9.0pt'>P:</span></b><span style='font-size:9.0pt'> 305.594.0660 <b>Ext:</b> 217 </span><span style='font-size:9.0pt;color:black'>Ӏ</span><span style='font-size:9.0pt'> <b>F: </b>305.594.0907 </span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><u><span lang=IT style='font-size:9.0pt'><a href="http://www.jalrw.com"><span style='color:black'>www.jalrw.com</span></a></span></u><span lang=IT style='font-size:9.0pt'> </span><span style='font-size:9.0pt'>| <a href="ccaballero@jalrw.com%20"><span style='color:black'>ccaballero@jalrw.com</span></a> </span><o:p></o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 align=left style='border-collapse:collapse'><tr><td valign=top style='padding:0in 7.5pt 3.75pt 0in'></td></tr></table><p class=MsoNormal style='text-autospace:none'><span style='font-size:9.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='text-autospace:none'><a href="http://www.facebook.com/jalrw" target="_blank"><span style='text-decoration:none'><img border=0 width=26 height=28 id="Picture_x0020_1" src="cid:image001.png@01CFE848.C6420AE0" alt=Facebook></span></a> <a href="http://www.linkedin.com/company/johnson-avedano-lopez-rodriguez-&-walewski-engineering-group-inc./" target="_blank"><span style='text-decoration:none'><img border=0 width=26 height=28 id="Picture_x0020_14" src="cid:image002.png@01CFE848.C6420AE0" alt=LinkedIn></span></a> <a href="https://www.twitter.com/JALRW/" target="_blank"><span style='text-decoration:none'><img border=0 width=26 height=28 id="Picture_x0020_3" src="cid:image003.png@01CFE848.C6420AE0" alt=Twitter></span></a> <a href="https://plus.google.com/u/0/b/112470263254966771834/112470263254966771834/posts" target="_blank"><span style='text-decoration:none'><img border=0 width=25 height=28 id="Picture_x0020_4" src="cid:image004.png@01CFE848.C6420AE0" alt="Google Plus"></span></a> <o:p></o:p></p><p class=MsoNormal style='text-autospace:none'> <o:p></o:p></p><p class=MsoNormal style='text-align:justify;text-autospace:none'><span style='font-size:7.0pt'>This email and any files transmitted with it are confidential and intended solely for the addressee.</span><o:p></o:p></p><p class=MsoNormal style='text-align:justify;text-autospace:none'><span style='font-size:7.0pt'>If you are not the named addressee you should not disseminate, distribute, copy, or alter this email.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.0pt'>Please consider the environment before printing this email.</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><pre>_______________________________________________<o:p></o:p></pre><pre>Trace-users mailing list<o:p></o:p></pre><pre><a href="http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org</a><o:p></o:p></pre><pre>To unsubscribe from this mailing list send a blank message to <a href="mailto:TRACE-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">TRACE-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></pre></blockquote><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif";color:windowtext'>This e-mail may contain information that is confidential, privileged or otherwise protected from disclosure. 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