I am working on a energy modeling for a relocation industry factory, The entire space is conditioned. Since the air clean condition of production area has a high requirement, the factory design 100% outdoor air to meet the requirement before. With the improvement of the production process, now the factory allow to design 30% outdoor air and 70% recycle air to meet the requirement. And now, I have two questions:
1. Can this kind of AHU system be looked as process system?
2. If can be looked as process system, the new design outdoor air flow rate is different with old design. How to model it in the baseline modeling?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 23, 2014 - 9:07 am
1. Since the system also conditions the air for people it cannot be considered strictly process.
2. It should be modeled identical to the Proposed in the Baseline in actual airflow not percentage. If you are attempting to claim any energy savings relative to this strategy then you would need to submit it as an exceptional calculation.
Renaud Gay
Shanghai Pacific Energy Center17 thumbs up
April 25, 2014 - 4:43 am
Thanks for reply.
As you said, if the system conditions the air for people, it cannot be considered to process. But if there are no people stay in room and condition requirement is just follow the process requirement, can it be considered to process?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 25, 2014 - 9:52 am
If ASHRAE 62.1-2007 applies then the ventilation cannot be considered process. If people are in the space at all while the process is operating then it cannot be considered process. There are likely some rare situations where the ventilation air would be considered process like a paint booth or engine test chamber where there is 100% outside air during the operation of the process.