[Equest-users] Define unique SUPPLY-FLOW for heating and cooling modes for a PSZ or PVVT system?

[Phil Jordan via Equest-users]

Thanks, Bill.


How about, for PVVT, is it possible to set a unique supply flow per cooling (or heating) stage? Could the hourly value of the COOL-STAGE keyword be used in a BDL expression to dictate SUPPLY-FLOW?


Thanks,

Phil

________________________________
From: Bishop, Bill <bbishop at pathfinder-ea.com>
Sent: Wednesday, August 16, 2017 1:50 PM
To: Phil Jordan
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] Define unique SUPPLY-FLOW for heating and cooling modes for a PSZ or PVVT system?


Hi Phil,

No, not exactly. But you can specify different system MIN-FLOW-RATIOs for cooling mode and heating mode.

For your example, you can set HMIN-FLOW-RATIO to 550/800 = 0.6875.

You would also need to change the FAN-CONTROL to something other than CONSTANT-VOLUME for PSZ systems.

For VAVS and PVAVS systems, you also have the option of specifying an HMAX-FLOW-RATIO, but not greater than 1.0.

You can change these values at the zone level as well.



Regards,

~Bill



William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP

Senior Energy Engineer


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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Phil Jordan via Equest-users
Sent: Wednesday, August 16, 2017 4:32 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Define unique SUPPLY-FLOW for heating and cooling modes for a PSZ or PVVT system?



With a PSZ or PVVT system type in eQUEST, is it possible to define a different supply airflow in heating vs cooling mode (ex. 800 CFM in cooling mode; 550 CFM in heating mode)? If so, how can this be done? Thanks!
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