If attempting to make use of LI 10371 for garage demand control ventilation how should the proposed model be differentiated from baseline to take advantage of CO sensors? Is it the (i) cfm, (ii) schedule of system operation or (iii) the installed power of the garage exhaust proposed system which would be different from the baseline? Alternatively, should both models be identical and then use a simple equation as part of an ECM multiplying the installed power of the exhaust system with a differentiated schedule of operation to estimate energy use? Thank you in advance.
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 13, 2018 - 8:52 am
The proposed is modeled as designed.
The baseline would be modeled based on ASHRAE 90.1-2010, Section 6.4.3.4.5. No controls are required if any of the exceptions apply. The cfm, schedule of operation and the fan power will likely be different.
Your alternative would not be acceptable in my mind. You should model the savings.
Charalampos Giannikopoulos
Senior Sustainability ConsultantDCarbon
84 thumbs up
July 13, 2018 - 11:08 am
Thank you Marcus. However is it possible to model CO sensors in EQuest? An alternative approach would be to differentiate the schedule of operation. Since, when no CO sensors exist the mode would be always on (baseline), whereas when CO sensors do exist an approach of the schedule assuming peak operation at the beginning and end of the day, running at a lower fraction all other times, would possible make sense (proposed). Would this be acceptable?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 13, 2018 - 12:15 pm
No it can't model CO. Yes you create a schedule based on the expected traffic in the garage during each hour of the day and then apply an appropriate diversity to each hour. This would be acceptable.