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<DIV>Bill and James:</DIV>
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<DIV><FONT color=#ff0000>...the proposed would have the max number of people for only as many hours as submitted in the project narrative for FTE usage of the space, and a minimum number of people (or no one) for the remaining occupied-mode time....</FONT></DIV>
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<P><FONT color=#000000 size=2 face=Arial>Baseline = 100% of the occupancy for each space not required to have DCV. Reducing the occupancy (% of people) within the space to coincide with the FTE usage provides a reduced OA based on DCV control. The OA per SF of the space remains the same in both cases. The building's occupied/unoccupied schedules remain the same in both cases.</FONT></P>
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<P><FONT size=2 face=Arial><U>Example:</U></FONT></P>
<P><FONT size=2 face=Arial>Baseline = <STRONG>Space</STRONG> occupied 7am to 7pm with 20 people (100% scheduled occupancy for all 12 hours)</FONT></P>
<P><FONT size=2 face=Arial>Proposed DCV = <STRONG>Space</STRONG> occupied 7am to 9am with 20 people (100% scheduled occupancy for 2 hours) <U>and</U> 9am to 5pm with 2 people (10% scheduled occupancy for 8 hours) <U>and</U> 5pm to 7pm with 0 people (0% schedule occupancy for 2 hours): based on FTE usage of space.</FONT></P>
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<P><FONT size=2 face=Arial>Both models have the same building occupancy schedules 7am to 7pm.</FONT></P>
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<DIV>I thought we were discussing DCV control and OA rates, which refers to spatial occupancy schedules; not building occupied/unoccupied schedules, so I don't know how we got onto the topic of building occupancy schedules.</DIV>
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<DIV><FONT size=1 face=verdana><STRONG>Ron Lamarre, AIA, NCARB</STRONG></FONT></DIV>
<DIV><FONT face=verdana><FONT size=1>Architect - <STRONG>LEED AP BD+C</STRONG></FONT></FONT></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> "Bishop, Bill" <wbishop@pathfinder-ea.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> James Hansen <JHANSEN@ghtltd.com>; ron lamarre <lamarre_arch@yahoo.com>; equest-users <equest-users@lists.onebuilding.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tue, July 27, 2010 2:32:07 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Equest-users] Demand Controlled Ventilation and EA Credit 1<BR></FONT><BR>
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<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Ron,</SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">I’m with James on this one. I can see changing lighting or equipment schedules to capture ECMs but changing occupancy schedules makes no sense unless you’re modeling telecommuting or 4-day work week. You can capture DCV savings in eQUEST by selecting DCV as the Minimum OA Control Method for the system and having an occupancy schedule with a varying percentage (not 100%) during occupied hours. Using the same occupancy schedule, the model with DCV will heat/cool less OA air and show savings.</SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Regards,</SPAN></FONT></P>
<P class=MsoNormal><FONT color=navy size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: navy; FONT-SIZE: 10pt">Bill</SPAN></FONT></P>
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<P class=MsoNormal><B><FONT color=black size=2 face="Franklin Gothic Medium Cond"><SPAN style="FONT-FAMILY: 'Franklin Gothic Medium Cond'; COLOR: black; FONT-SIZE: 10pt; FONT-WEIGHT: bold">William</SPAN></FONT></B><B><FONT color=black size=2 face="Franklin Gothic Medium Cond"><SPAN style="FONT-FAMILY: 'Franklin Gothic Medium Cond'; COLOR: black; FONT-SIZE: 10pt; FONT-WEIGHT: bold"> Bishop , PE</SPAN></FONT></B><B><FONT color=black size=2 face="Franklin Gothic Medium Cond"><SPAN style="FONT-FAMILY: 'Franklin Gothic Medium Cond'; COLOR: black; FONT-SIZE: 10pt; FONT-WEIGHT: bold">, BEMP, LEED<SUP>®</SUP> AP </SPAN></FONT></B><B><FONT color=#006600 size=2 face="Franklin Gothic Medium Cond"><SPAN style="FONT-FAMILY: 'Franklin Gothic Medium Cond'; COLOR: #006600; FONT-SIZE: 10pt; FONT-WEIGHT: bold">|</SPAN></FONT></B><B><FONT color=black size=2 face="Franklin Gothic Medium Cond"><SPAN style="FONT-FAMILY: 'Franklin Gothic Medium Cond'; COLOR: black; FONT-SIZE:
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<P class=MsoNormal><FONT color=black size=1 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: black; FONT-SIZE: 9pt">wbishop@pathfinder-ea.com</SPAN></FONT></P>
<P class=MsoNormal><FONT color=black size=1 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: black; FONT-SIZE: 9pt">www.pathfinder-ea.com</SPAN></FONT><FONT color=navy><SPAN style="COLOR: navy"></SPAN></FONT></P>
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<P class=MsoNormal><B><FONT size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</SPAN></FONT></B><FONT size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>James Hansen<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, July 27, 2010 2:23 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> ron lamarre; equest-users<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Equest-users] Demand Controlled Ventilation and EA Credit 1</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT color=red size=2 face=Calibri><SPAN style="FONT-FAMILY: Calibri; COLOR: red; FONT-SIZE: 11pt">“</SPAN></FONT><FONT color=red size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: red; FONT-SIZE: 10pt">For the record, the occupancy schedule refers to the people present within the space. For instance, a space within the baseline (not required by ASHRAE to have DCV) would have the max number of occupants for the entire occupied-mode schedule; however, the proposed would have the max number of people for only as many hours as submitted in the project narrative for FTE usage of the space, and a minimum number of people (or no one) for the remaining occupied-mode time. Thus we create an occupancy (people) schedule for the space. During the unoccupied mode the fans would cycle as required with no people, no lighting (automatic shut off), acting on the heating & cooling
loads. We would not install DCV if the occupant loads didn't change during the occupied mode.”</SPAN></FONT></P>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Ron, please educate me if I’m reading your email wrong, but are you saying that your occupancy schedule in the proposed design does not match the baseline design? This is strictly prohibited in App G I thought… You can change schedules to take advantage of non-standard ECMs like DCV, and automatic lighting reductions for the use of occupancy sensors (in rooms NOT already required to have them by code). But having a conference room 100% occupied from 7am-6pm in the baseline model and only 100% occupied from 9am-noon in the proposed model is not a valid way to demonstrate savings from DCV, since there will be energy savings related to the people latent/sensible production that has nothing to do with DCV. Don’t you have to create a minimum outside air schedule to demonstrate DCV savings? If you have received credit for simply reducing the Occupancy Schedule in
the proposed model, that is very interesting…</SPAN></FONT></P>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Thanks!</SPAN></FONT></P>
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<P class=MsoNormal><B><FONT size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</SPAN></FONT></B><FONT size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"> ron lamarre [mailto:lamarre_arch@yahoo.com] <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, July 27, 2010 2:08 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> James Hansen; equest-users<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Equest-users] Demand Controlled Ventilation and EA Credit 1</SPAN></FONT></P></DIV></DIV>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">Hi James:</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">For the record, the occupancy schedule refers to the people present within the space. For instance, a space within the baseline (not required by ASHRAE to have DCV) would have the max number of occupants for the entire occupied-mode schedule; however, the proposed would have the max number of people for only as many hours as submitted in the project narrative for FTE usage of the space, and a minimum number of people (or no one) for the remaining occupied-mode time. Thus we create an occupancy (people) schedule for the space. During the unoccupied mode the fans would cycle as required with no people, no lighting (automatic shut off), acting on the heating & cooling loads. We would not install DCV if the occupant loads didn't change during the occupied mode.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">We also use general lighting schedules that take advantage of installed occupancy sensors, and process load schedules that take advantage of Energy Star computers and monitiors.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">The HVAC engineer decides the minimum design rate for each space to work (heating & cooling) if fully occupied with all the lights, process loads, and people during the occupied mode. This is normally at or above the 62.1 and/or other code-required minimums (never below due to the LEED pre-requisite). Sharing the reduction schedules placed into eQuest with a template-narrative to support the reductions (based on ASHRAE 90.1, Energy Star, etc... %-reductions) has been accepted by LEED.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt">We utilize an integrated design team method, where the engineers and I review the models that I construct. We also get peer reviews when we think it's necessary and/or when LEED throws us a curve. We pay for our peer reviews. I'm confident that anything we've submitted does not prove inconsistency within the review of EAc1.<BR> </SPAN></FONT></P></DIV>
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<P class=MsoNormal><STRONG><B><FONT size=1 face=Verdana><SPAN style="FONT-FAMILY: Verdana; FONT-SIZE: 7.5pt">Ron Lamarre, AIA, NCARB</SPAN></FONT></B></STRONG><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"></SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=1 face=Verdana><SPAN style="FONT-FAMILY: Verdana; FONT-SIZE: 7.5pt">Architect - <STRONG><B><FONT face=Verdana><SPAN style="FONT-FAMILY: Verdana">LEED AP BD+C</SPAN></FONT></B></STRONG></SPAN></FONT><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"></SPAN></FONT></P></DIV>
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<P class=MsoNormal><SPAN class=apple-style-span><B><FONT size=1 face=Verdana><SPAN style="FONT-FAMILY: Verdana; FONT-SIZE: 7.5pt; FONT-WEIGHT: bold">Design + Energy Modeling + LEED Administration</SPAN></FONT></B></SPAN><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"></SPAN></FONT></P></DIV></DIV></DIV></DIV>
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<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><B><FONT size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</SPAN></FONT></B><FONT size=2 face=Tahoma><SPAN style="FONT-FAMILY: Tahoma; FONT-SIZE: 10pt"> James Hansen <JHANSEN@ghtltd.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> ron lamarre <lamarre_arch@yahoo.com>; Karen Walkerman <kwalkerman@gmail.com>; <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tue, July 27, 2010 12:57:21 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: [Equest-users] Demand Controlled Ventilation and EA Credit 1</SPAN></FONT></P>
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<P class=MsoNormal><FONT color=red size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: red; FONT-SIZE: 10pt">“Each model that I've done for LEED utilizes the same ventilation rates between the proposed and design; whether it was ASHRAE 62.1 or IMC 2003; however, the occupancy schedules changed in spaces where DCV was installed.”</SPAN></FONT></P>
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<P class=MsoNormal><FONT color=#1f497d size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: #1f497d; FONT-SIZE: 11pt">Ron, that’s an interesting statement in itself – modifying occupancy schedules has an impact on the mechanical cooling (not just the cooling associated with reduced ventilation air), which isn’t really fair. Was that approved by GBCI? If so, I guess it’s further proof that there is still a lot of inconsistency in the review of EAc1. </SPAN></FONT></P>
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<P class=MsoNormal><FONT color=#1f497d size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: #1f497d; FONT-SIZE: 11pt">Karen, I think your letter does a good job of requesting an official “ruling” from the USGBC.</SPAN></FONT></P>
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<P style="MARGIN-BOTTOM: 12pt" class=MsoNormal><B><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt; FONT-WEIGHT: bold">From:</SPAN></FONT></B><FONT size=2 face=Arial><SPAN style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"> Karen Walkerman <kwalkerman@gmail.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> equest-users <equest-users@lists.onebuilding.org><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tue, July 27, 2010 12:10:27 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Equest-users] Demand Controlled Ventilation and EA Credit 1</SPAN></FONT></P>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">All,</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">below is a draft letter to the EA Credit 1 TAG chair. I welcome any edits, or critiques, and if anyone would like to be a co-signer of the letter, please let me know.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Thanks,</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Karen</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">It has come to our attention from a posting on the eQuest list-serve that a fellow energy-modeling professional has been asked to model proposed design and baseline design ventilation rates differently where the proposed design model utilizes demand controlled ventilation. We have searched the ASHRAE 90.1 documentation as well as the LEED reference documentation and consistently find the requirement that baseline ventilation rates be modeled the same as the proposed design, and that credit can be taken for demand controlled ventilation.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">We understand that large energy savings can be gained from demand controlled ventilation and that in certain cases, 'gaming' of the system could result in abnormally high ventilation rates for the baseline design, while the DCV system keeps ventilation rates low in the proposed design, however, our main concern is that energy modelers are being made aware of changes to guidelines during the design review process. At this stage, the energy modeler has already completed a significant amount of work in preparing the proposed and baseline design energy models, and all associated documentation. Changing the baseline design ventilation rates requires re-modeling of the building and increases the likelihood that the project will have to challenge a 'rejected' result if the LEED reviewer is not satisfied with the energy modeler's response and modeling
changes.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">We feel that it may be time to develop modeling guidelines for demand controlled ventilation, and that these guidelines should be developed, released, and required in a similar fashion to the district energy guidelines published by LEED for NC 2.2 Furthermore, we feel that any changes made to EA Credit 1 energy modeling guidelines should be made with adequate notice to the energy modeling community.</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Thank you for your consideration on this issue,</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Karen Walkerman</SPAN></FONT></P></DIV>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Second Law</SPAN></FONT></P></DIV>
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