In the 62MZ calc, i created zones that have heating and potentially critically zones, but im having an issue with the results; for Vdzd, i enter the airflow rate that corresponds to the minimum VAV damper position, which is 30% of the rated airflow of the VAV, then in the Ds field, i enter '30%', but the results for the 'outdoor air intake required for system' shows an error.Im using the April 2011 version of the calc.and also downloaded a fresh version, but ended up with errors again. Anyone else experienced this? If i change Vdzd to the max/total airflow for the zone/VAV and set Ds to 30%, i do not get an error, but not sure if this is the right approach. I've been scratching my head on this one for a while and would greatly appreciate any inputs on this, or if anyone has a sample calc.for the 62MZ calc, that would really help.
Thanks.
B.
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Tyler Thumma
7GroupLEEDuser Expert
67 thumbs up
December 21, 2012 - 2:04 pm
Bobby,
I have experienced this, and it seems like the reduced airflow should only be accounted for by modifying Ds rather than Vdzd. Otherwise the calculator is essentially applying the 30% twice, resulting in a supply airflow equal to 9% of the rated value. I would leave Vdzd at the rated value and only adjust Ds.