[Equest-users] System 4 - PSZHP Unmet Hours - "undefined" thermostat schedules

Wed Feb 14 07:49:18 PST 2018

When you set the zone COOL/HEAT-TEMP-SCH to “undefined”, there is no thermostat control in the zone and no unmet cooling/heating hours will be reported because the system is not trying to maintain the zone at any particular temperature. The cooling and/or heating thermostat schedules should be defined for at least the control zone of a single zone system.
~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 umesh atre via Equest-users
Sent: Wednesday, February 14, 2018 10:26 AM
To: Rybl, Vicki <vrybl at rdkengineers.com>
Cc: equest-users at onebuilding.org
Subject: Re: [Equest-users] System 4 - PSZHP Unmet Hours

Hi Vicki,

When I run your model, I get unmet hours for all except PSZ 9. After looking a bit further, this seems to be the only one with no Heat (or Cool) Temp Schedule defined.
If you revert the schedules back to the default 'undefined' for all systems, all unmet hours go away. I am not sure what this means, but does look schedule related.
Hoping this helps,
Take care,
Umesh

On Wed, Feb 14, 2018 at 8:10 AM, Rybl, Vicki via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>> wrote:
Thanks Chris – how did you deal with economizer inputs for the PTHP system?

John – weather file is attached.

Vicki Rybl, LEED AP BD+C, Fitwel Ambassador | Energy Engineer | RDK Engineers, An NV5 Company<http://www.nv5.com/>
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From: Jones, Christopher [mailto:Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>]
Sent: Wednesday, February 14, 2018 8:14 AM
To: John Aulbach <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>>; Rybl, Vicki <vrybl at RDKEngineers.com<mailto:vrybl at RDKEngineers.com>>
Cc: equest-users at onebuilding.org<mailto:equest-users at onebuilding.org>
Subject: RE: [Equest-users] System 4 - PSZHP Unmet Hours

I had the same problem with the PSZ HP system using 3.65.7173. I eventually gave up and switched to PTAC HP and the under heated hours disappeared.

Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

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Please consider the environment before printing...

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of John Aulbach via Equest-users
Sent: Tuesday, February 13, 2018 3:38 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>; Rybl, Vicki <vrybl at RDKEngineers.com<mailto:vrybl at RDKEngineers.com>>
Subject: Re: [Equest-users] System 4 - PSZHP Unmet Hours

Would you please send us your weather file also. I cannot seem to get it to download.

Thanks.

John

On Tuesday, February 13, 2018, 12:27:43 PM PST, Rybl, Vicki via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>> wrote:

Here are the model files.

Vicki Rybl, LEED AP BD+C, Fitwel Ambassador | Energy Engineer | RDK Engineers, An NV5 Company<http://www.nv5.com/>

70 Fargo Street, Suite 800 | Boston, MA 02210 | P: 857.221.5943<tel:(857)%20221-5943> | F: 617.345.4226<tel:(617)%20345-4226>

Electronic Communications Disclaimer<http://www.nv5.com/contact-us/electronic-communications-disclaimer/>

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of John Aulbach via Equest-users
Sent: Tuesday, February 13, 2018 1:54 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] System 4 - PSZHP Unmet Hours

Vicki:

Would you kindly send the Group your .INP and .PD2 files, so we can help you?

John R. Aulbach, PE

On Tuesday, February 13, 2018, 10:34:27 AM PST, Rybl, Vicki via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>> wrote:

eQuesters:

We’re working on a 90.1-2007 baseline model with System 4: PSZ-HP. It’s modeled as a Packaged Single Zone system with DX cooling and Heat Pump heat. Unmet hours in all zones are through the roof, around 6,000. We’ve gone through all our usual methods to mitigate unmet hours to no avail (zone entering temp, schedules, total airflow, zone heat source, feels like we’ve changed every input available?).

If the heat source is switched to electric or furnace, the unmet hours disappear. In addition, the design is a VRF system that’s being modeled as a PSZ heat pump and has no unmet hours.

Has anyone run into this issue? What are we missing?

Any insight is appreciated.

Vicki Rybl, LEED AP BD+C, Fitwel Ambassador | Energy Engineer | RDK Engineers, An NV5 Company<http://www.nv5.com/>

70 Fargo Street, Suite 800 | Boston, MA 02210 | P: 857.221.5943<tel:(857)%20221-5943> | F: 617.345.4226<tel:(617)%20345-4226>

Electronic Communications Disclaimer<http://www.nv5.com/contact-us/electronic-communications-disclaimer/>

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