What’s the best way to proceed with the energy model of the following case?
The building is a 4000m² manufacturing building where there is a small office area and a large high bay industrial area. Both spaces area regularly occupied. The office is artificially conditioned and the industrial only naturally ventilated. The LEED certification is the NC version 2009.
For the EAp2 option 2, how do I model the industrial area? Can I us the airflow network model on EnergyPlus. And for the IEQp1 can I use the same model to show that the exterior air volume is in accordance with the ASHRAE 62.2 – 2007?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 8, 2015 - 9:33 am
Option 2 would not apply to your situation. You cannot use it and get the whole building certified. You would need to follow Option 1.
The proposed case is always modeled as designed and the baseline according to Appendix G. Since the manufacturing area is unconditioned you model it that way in both models. Any manufacturing process loads or ventilation fans in this area is modeled identically in both models. Since the office is the only conditioned space you use that area to enter Table G3.1.1A and select the baseline HVAC system.
In general you cannot use the energy model to demonstrate ASHRAE 62.1 compliance. The calculations you do for IEQp1 however, should be consistent with the models.
Marcelo Maciel de Santa Helena
Eficiente Gestão de Engenharia e ProjetosApril 8, 2015 - 1:25 pm
Dear Marcus, thank you for your answer we really appreciate it.
As for the EAp2 it is clear for us, our doubt is, still, about the IEQp1:
For the office area we have a mechanically system and we can show the compliance with 62.1 but the manufacturing area will be naturally ventilated. Since it does not met the requirements of section 5.1.1 of 62.1 it needs an engineered natural ventilated system. How can we show the engineered system air flow? Can it be by the Airflow network model? Or do we have to show the whole engineering project?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 8, 2015 - 2:13 pm
Will it be ventilated with any fans or strictly by passive means?
Rathnashree Bharadwaj
4 thumbs up
April 9, 2015 - 2:38 am
How to handle if there are absolutely no conditioned spaces in a manufacturing facility or probably an unconditioned office building? Is it accepted if we just show compliance with only lighting and equipment loads.
Marcelo Maciel de Santa Helena
Eficiente Gestão de Engenharia e ProjetosApril 9, 2015 - 9:02 am
Marcus, Strictly by passive means, no fans will be used.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 9, 2015 - 10:07 am
Marcelo - See the Case 2 compliance paths under IEQc2. Any of those natural ventilation options can be used to demonstrate compliance for IEQp1. An airflow model is one of the options.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
April 9, 2015 - 10:11 am
Rathnashree - if the entire building is unconditioned then it gets modeled identically for HVAC. You can claim lighting and equipment savings. You must show compliance with the ventilation requirements for IEQp1.