[Equest-users] Using Dedicated Outdoor Air System defies ASHRAE 62.1

[Doebber, Ian]

FYI : When using "OA-FROM-SYSTEM" in to model a Dedicated Outdoor Air
System (DOAS), you must specify "Sum of Zone OA" both for the DOAS and
the AHU that it is serving.  The "OA-FROM-SYSTEM" does not correctly
update the DOAS Flow Rate to meet the AHU Outdoor Air Design Ventilation
if you specify "Set by Critical Zone".  

 

This causes a problem as "Set by Critical Zone" is the correct way to
Design the Maximum Ventilation Rate according to ASHRAE 62-2004.  Based
on my 200,000 ft2 School model, the "Sum of Zone OA" undersizes the
amount of Ventilation Air by 25%.   Obviously significant.

 

Note that this is using Equest 3.6.  Can someone tell me whether this
has been fixed in Equest 3.61.  

 

Regards,

Ian Doebber

 

 

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