[Equest-users] PIU vs. VAV in eQuest

[Kevin Madison]

Matt -
You may be observing the result of the different default for 
"THERMOSTAT-TYPE" for zones served by each system. The default for VAVS 
is "REVERSE-ACTION" while it is "PROPORTIONAL" for PIU. Take a look in 
the DOE-2 documentation for descriptions of each of these and how this 
property affects ZONE terminal unit and SYSTEM operation.
- Kevin

Kevin Madison
Madison Engineering PS
Seattle WA


Matthew Dubrovich wrote:
>
> For those that are on both the BLDG-SIM and this list, I apologize for 
> the repost…
>
> Question on PIU vs. VAV systems in eQuest…
>
> If a PIU system has only SVAV boxes and all other parameters are 
> identical, does the PIU act like a VAV in eQuest? Only changing the 
> system type in my model seems to have a significant impact on energy 
> usage and I can’t track down why that is. The difference is 
> significant enough that with App. G System 7 VAV w/RH, the choice 
> between PIU and VAV has an effect on the number of points. Any 
> thoughts would be appreciated.
>
> Thanks,
>
> Matt
>
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