The Template calculates Vot by dividing Voz by Ev. ASHRAE 62.1 2007 arrives at Vot by dividing Vou by Ev, not Voz. This matters because Voz has already been corrected to account for the zone air distribution effiectiveness where Vou has not. This results in Vot being much higher than anticipated. Is this a known error in the credit template that I can simply bypass by asking for the most recent update of the template? Has anybody else ran into this error?

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Rick Servoss

Mechanical Engineer

LEEDuser Basic Member

23 thumbs up

Mon, 09/12/2011 - 20:42

I should note that this is a multizone recirculating system.

Tyler Thumma

7Group

LEEDuser Expert

65 thumbs up

Fri, 12/21/2012 - 18:54

Rick, It sounds like you are using an older version of the form, and yes you are correct, this error does result in an over-exaggerated value for Vot. GBCI is aware of this error, which has been corrected in subsequent versions of the form which have separate sections for single-zone, multiple-zone, and 100% outdoor air systems. You can either request the most recent version of the form or complete the calculations using the ASHRAE 62MZCalc spreadsheets.

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Calculating Vot in Credit Template

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