Hi, I am not quite sure how to comply with Appendix G requirement to heat & Cool all conditioned/indirectly conditioned spaces and use baseline system where not designed whilst still staying true to the proposed design. I have 2 scenarios which seem to be causing issues.
Scenario 1 - Spaces which are heating only (E.g locker rooms)
Scenario 2 - Restrooms/stores which have transfer fans
The baseline system is system 7 VAV with reheat. So I am not sure how I can apply a completely different system to a room with heating only in the proposed. Do i ignore the actual proposed heating coils and match the entire system (e.g cool to 55 and reheat as required using the proposed boiler plant) sizing the airflows/coils as the baseline is sized for both heating/cooling.
The rest rooms are modeled in VE IES Apache HVAC as receiving transfer air from the appropriate rooms. Would these rooms then need to be on another network which uses the baseline system?
Is the baseline plant just sized for these rooms (as opposed the baseline which it is sized for all rooms)
Many thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
May 8, 2014 - 1:56 pm
For the heating only spaces I would suggest you apply addenda dn and use a system 9 in the baseline.
For indirectly conditioned spaces in the baseline you model them identical to the proposed using the baseline system. The proposed is modeled as designed.
Victoria Watson
AECOM4 thumbs up
June 2, 2014 - 9:28 pm
Hi Marcus,
So i think what you are saying is if you had a restroom in the proposed with exhaust, you would model it as is. Then in the baseline you would model with VAV with reheat (if the building was system 7) however the setpoint would be whatever condition the proposed is meeting so most likely there would be no cooling/heating load so the CFM in the spaces from cooling/heating would be zero with just the exhaust as per the proposed (fan power proportion out of the total from the 90.1 equation).
Thanks
Victoria
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
June 3, 2014 - 10:23 am
Not sure if you would have no heating/cooling load in the space but the rest of it sounds right. The exhaust fan power does get proportioned out of the total Baseline fan power calculated for that system.
Victoria Watson
AECOM4 thumbs up
June 3, 2014 - 10:30 am
Thanks Marcus
If the proposed doesn't require any heating/cooling they I don't see why the baseline would for internal spaces such as restrooms to meet the same conditions. I am just concerned about penalizing the baseline too much in exhaust only spaces when the proposed isn't conditioning them directly.
Vicky
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
June 3, 2014 - 10:44 am
Agreed.