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

Wed Aug 23 13:17:50 PDT 2017

Phil, what you're describing as an expression that reads in an hourly variable is I believe what my predecessors in doe2 history would coin as an Input Function.  Not something we can do in doe 2.2+ (presently), but it comes up from time to time as something some would like to see resurface and become a feature accessible through the eQUEST interface.  Further reading and examples of functions are available in your help file (doe2 reference manual) under the entry Volume 3: Topics > Building Description Language > Input Functions.

Short of rolling back and doing your project with such an Input Function in 2.1e, I don't think there is a way to accomplish this for PVVT.

VAVS and PVAVS systems have the option of using HMAX-FLOW-RATIO to define heating mode supply air ratios at a central/zonal level, but since PVAVS is distinct from PVVT in not really being able to supply heated air from the central unit based on heating/cooling mode as PVVT is designed, I don't think you want to switch system types.

And just to be sure, I checked and confirmed that HMAX-FLOW-RATIO has zero impact on PVVT systems with a dummy model.

~Nick

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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 23, 2017 2:02 PM
To: 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?

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

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From: Bishop, Bill <bbishop at pathfinder-ea.com<mailto:bbishop at pathfinder-ea.com>>
Sent: Wednesday, August 16, 2017 1:50 PM
To: Phil Jordan
Cc: equest-users at lists.onebuilding.org<mailto: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<mailto: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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