Forum discussion
NC-2009 EAp2: Minimum Energy Performance
Hi!
how can I prove that an environment is naturally conditioning?
I believe this is not only proven by percentage of openings, correct?
For example, how to prove this in a restaurant?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 9, 2013 - 10:29 am
Are you attempting to obtain energy saving credit for natural ventilation? If so there is some guidance in one of the Appendices in the Advanced Energy Modeling Guide - http://www.usgbc.org/resources/advanced-energy-modeling-leed-technical-m...
Joseph Snider
PrincipalIntegrative Sustainability Solutions
51 thumbs up
September 10, 2013 - 9:36 am
I would suggest clarifying the difference between "naturally conditioned" and "naturally ventilated." You can have a mechanically conditioned space that is naturally ventilated, and vice versa. Example: An apartment unit that has a recirculating fan A/C, but no introduced air. This unit is mechanically cooling the air, but is complying with ASHRAE / Code ventilation requirements through operable windows. Yes, to comply with "natural ventilation" it is a ratio of operable window to your floor area (must be at least 4%) AND spaces can't be further than 25' from the window. This would be covered under ASHRAE 62 (chapter 5 - natural ventilation) and calculations are available under the IEQp1 template. If you are doing Natural Conditioning, then this would need to be modeled according to ASHRAE 90.1 Appendix G guidelines.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
September 10, 2013 - 9:51 am
Very good point Joseph the two are often confused.
Unfortunately however Appendix G does not provide any guidance on claiming energy saving credit for natural conditioning.
Joseph Snider
PrincipalIntegrative Sustainability Solutions
51 thumbs up
September 10, 2013 - 12:03 pm
Yes - good clarification, Marcus. I didn't meant to imply there are savings from the naturally conditioned areas. But for simulating, just make sure you follow the App G guidelines for modeling it correctly.