I read through previous posts and have not seen an answer to this question so forgive me if I missed it. The ASHRAE calculator does not seem to apply to 100% outdoor air systems. Is this true or am I missing something? According to the standard, Vot = Sum Voz which forgoes the calculation of Ev. I do not see this option in the calculator.

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Dylan Connelly

Mechanical Engineer

Integral Group

LEEDuser Expert

342 thumbs up

Wed, 11/09/2011 - 01:39

The ASHRAE calculator that LEED supplies does not apply to 100% OSA systems. It applied to Multi-Zone Recirculating Systems. There is a difference calculation method for that type system. It is more straight forward. See section 6.2.4 in ASHRAE 62.1-2007. The equation says that you need to supply the total amount of air required by ASHRAE/Ez. So you don't do the correction for Zp/Ev. On the LEED form just use 1.0 for Ev because they don't let you leave it blank.

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