Good day, we have a project that is naturally ventilated. ASHRAE 90.1 2007 states that the energy cost budget method cannot be used for designs with no mechanical systems. We have all the calculations to prove natural ventilation will work but it appears we cannot target any points under HVAC. Is there a way for projects with natural ventilation to target points in the HVAC category of Eac1?

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Thu, 01/21/2016 - 13:48

The accepted method for projects to claim savings for natural ventilation is contained in one of the appendices to the Advanced Energy Modeling Guide for LEED Technical Manual.

Chilufya Lombe

Sustainability Consultant

Solid Green Consulting

LEEDuser Basic Member

23 thumbs up

Wed, 04/20/2016 - 12:51

Hi Marcus, how does this work when only a section of the building is mechanically ventilated? Would we use the guidance in the Advanced Energy Modelling Guide for the naturally ventilated spaces and Core Performance guide for the mechanically ventilated portion?

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Mon, 04/25/2016 - 16:07

I don't think you can mix the performance path with a prescriptive path. You could model model both systems in different parts of the building.

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