Title 24 Nonres ACM - Fan Motor Efficiency

[GoogleCodeExporter]

In the ACM, the Air Handler Cycling and Fan Schedule sections make it seem like 
the supply fans are running continuously for 19 hrs per day. (This is the 
OfficeHVACAvailWD schedule). Is based on a prescriptive or mandatory Standard? 
This seems to be in excess of “usually occupied” as mentioned in 120.1(c) 
“The minimum rate of outdoor air required by Section 120.1(b)2 shall be 
supplied to each space at all times when the space is usually occupied.”

Could I alter the HVACAvail schedule to operate fewer hours to more accurately 
represent the Standards? Is this done by going into the -ab file and changing 
the schedules?

Original issue reported on code.google.com by f.le...@gmail.com on 23 Jan 2015 at 12:58

[GoogleCodeExporter]

The building may not actually require that duration of occupancy and associated 
ventilation, but the ACM Reference Manual and compliance software uses a fixed 
set of schedules for each unique building type that cannot be altered.

The standard design building (the reference for comparison) uses the same 
schedule, so a building will not be penalized for the fan operation required in 
the model.

Original comment by JohnJArent on 27 Jan 2015 at 11:56

• Changed state: Discussion

[GoogleCodeExporter]

This can only be fixed by adjusting the HVAC schedule, which isn't allowed in 
Title 24, and hasn't been.

We could consider adjusting the operating hours down for the next code cycle, 
but I recommend no change.

Original comment by JohnJArent on 20 Feb 2015 at 10:41

• Changed state: WontFix