I assume both Vpsd and Vdzd should both be taken at a set design condition (cooling or heating). I received the following GBCI comment:

"The Vdzd values should be the maximum design values and the other variables noted shall be modified to appropriately represent the worst-case condition. It is not clear whether the design cooling, or design heating condition (primary plus local recirculated air) represents the maximum supply to the zone."

This seems to imply the Vdzd values should be for the greatest of heating or cooling, and the condition might not be the same for every zone.

Is my original thought correct that Vpsd and Vpzd should always be evaluated under the same design condition?