<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt">Nina:<br><br>Below is a GBCI review comment on a project where I provided Enhanced Commissioning services, but not the energy model. It might help.<br><br><!--[if gte mso 9]><xml>
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<p><span style="font-size:7.0pt;font-family:Arial;color:#444444;letter-spacing:
.25pt">7. Table 1.4.2 and the system Input Data reports for the Proposed
model indicate that demand control ventilation (DCV) was modeled for credit in
the Proposed case; however, it is unclear how the outdoor air ventilation rates
were determined in each case. Table G3.1.4 in the Baseline building column
allows schedule changes for DCV as approved by the rating authority, and as the
rating authority, GBCI requires that, for spaces taking credit for DCV in the
actual design, the outdoor air ventilation rates in the Baseline model must be
modeled using the minimum ASHRAE Standard 62.1-2007 rates during periods of
peak occupancy, and the outdoor air ventilation rates in the Proposed model
must reflect the outdoor air ventilation rates from the actual design during
periods of peak occupancy. For example, if credit for DCV is reflected for AHU-3
in the Proposed model, the minimum outdoor air ventilation rates must reflect
497 cfm in the Baseline case and 1,000 cfm in the Proposed case, based on the
values indicated in IEQp1: Minimum Indoor Air Quality Performance. For spaces
taking credit for DCV in the actual design, revise the Baseline model to
reflect the ASHRAE Standard 62.1-2007 minimum outdoor air ventilation rates and
revise the Proposed model to reflect the outdoor air ventilation rates from the
actual design. For all other spaces (no DCV control or DCV control modeled in
both the Proposed and Baseline model), confirm that the outdoor air ventilation
volumes are modeled identically, using the actual as-designed ventilation rates
(not the ASHRAE Standard 62.1-2007 minimum ventilation rates) in the Proposed
and Baseline models, as required by Section G3.1.2.5. In addition, verify that
all HVAC systems in both the Proposed and Baseline cases are modeled with zero
outdoor air flow when the HVAC fans are cycled on to meet unoccupied setback
temperatures, unless health or safety regulations mandate an alternate minimum
flow during unoccupied periods (in which case, the unoccupied minimum outdoor
air ventilation rates must be modeled identically in each model). Further,
provide the revised total outdoor air ventilation volume (in units of cfm) for
the Proposed and Baseline models in Table 1.4.2, and provide a revised Input
Data report for each system in the Proposed and Baseline models reflecting the
changes. Note that the total minimum outdoor air ventilation volume in the
Baseline model must never be greater than the Proposed model.</span></p>
<br>Regards,<!--[if gte mso 9]><xml>
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<![endif]--><br><div> <br></div>Paul Diglio, CEM, CBCP<br><br><div>87 Fairmont Avenue<br>New Haven, CT 06513<br>203-415-0082</div><br><br><div><span><a target="_blank" href="http://www.pdigliollc.com">www.pdigliollc.com</a></span><div><br></div><div style="font-family:times new roman, new york, times, serif;font-size:10pt"><br><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Daniel Knapp <danielk@arborus.ca><br><b><span style="font-weight: bold;">To:</span></b> Netty Nina <nnina@ers-inc.com><br><b><span style="font-weight: bold;">Cc:</span></b> "equest-users@lists.onebuilding.org" <equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Fri, May 31, 2013 10:19:04 AM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [Equest-users] Cooling Increase DCV and ERV
Measures<br></font><br>
I don't know if this is relevant to your situation, but we recently ran into a problem where turning on DCV increased the OA intake for a VAV system. The model is at an early design stage for core and shell and the OA hasn't been specified yet so we were using eQuest OA autosizing. The OA without DCV was sized to meet the critical zone requirement at the full design supply flow rate. When using DCV, the OA is sized to meed the critical zone on an hour-by-hour basis, and as the supply flow rate drops, the outdoor air requirement can go up if the OA fraction for the critical zone approaches 1 leading to an increase in overall OA. Lesson learned: don't rely on eQuest to autosize the OA as it does the OA sizing against the full design supply flow rate which may not be the worst case condition. <br><br>Cheers,<br>Dan<br><br>—<br>Daniel Knapp, PhD, P Phys, LEED® AP O+M<br><a ymailto="mailto:danielk@arborus.ca"
href="mailto:danielk@arborus.ca">danielk@arborus.ca</a><br><br>Arborus Consulting<br>Energy Strategies for the Built Environment<br><span><a target="_blank" href="http://www.arborus.ca">www.arborus.ca</a></span><br>76 Chamberlain Avenue <br>Ottawa, ON, K1S 1V9 <br>Phone: (613) 234-7178 ext. 113<br>Fax: (613) 234-0740<br><br><br><br><br>On 2013-05-30, at 10:23 PM, Netty Nina <<a ymailto="mailto:nnina@ers-inc.com" href="mailto:nnina@ers-inc.com">nnina@ers-inc.com</a>> wrote:<br><br>> Hi eQuesters,<br>> <br>> The next two questions have been asked on here multiple times, but I have scourged the list and haven’t found a resolution. My building is a school in New England.<br>> <br>> I have a DCV measure that shows an increase in cooling. My thought is that DCV is taking precedence over the economizer. Is there a way to force eQuest to have economizer priority or is there another issue going on?<br>> <br>> The
other issue is in the Heat Recovery. It also shows an increased cooling load for the building. I tried setting it on an ERV Schedule and limiting it to the heating season. I tried playing with the different controls. I know it’s not due to the increase in fan energy needed since the majority of units already have ERVs, but the efficiencies are better than code (and I also tried messing with the fan energy). Someone on the bldg-sim list even suggested controlling the ERV with Exhaust DT and increasing the delta-T to 20F.<br>> <br>> I couldn’t get any suggestions to work. How can I avoid overheating? Or is there another issue?<br>> <br>> Thanks in advance for any help you can give me.<br>> <br>> Sincerely,<br>> <br>> Netty<br>> <br>> <br>> Netty Nina, LEED® AP BD+C<br>> Project Engineer<br>> ERS<br>> 120 Water Street, Suite 350<br>> North Andover, MA
01845<br>> <br>> Ph: 978-521-2550 ext. 224<br>> Fax: 978-521-4588<br>> <a ymailto="mailto:nnina@ers-inc.com" href="mailto:nnina@ers-inc.com">nnina@ers-inc.com</a><br>> www.ers-inc.com<br>> <br>> _______________________________________________<br>> Equest-users mailing list<br>> <a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>> To unsubscribe from this mailing list send a blank message to <a ymailto="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><br><br>_______________________________________________<br>Equest-users mailing list<br><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org"
target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><br>To unsubscribe from this mailing list send a blank message to <a ymailto="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><br></div></div></div>
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