[Equest-users] System 4 - PSZHP Unmet Hours - DOE-2.3

Wed Feb 14 10:01:16 PST 2018

Hi Bill,

Thanks for the tip. I didn’t realize we could run DOE-2.3 from the eQuest interface. Will need to run through the inputs to make sure they are still accurate, but everything seems to be in line…

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 | F: 617.345.4226

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

From: Bishop, Bill [mailto:bbishop at pathfinder-ea.com]
Sent: Wednesday, February 14, 2018 11:01 AM
To: Jones, Christopher <Christopher.r.Jones at wsp.com>; John Aulbach <jra_sac at yahoo.com>; Rybl, Vicki <vrybl at RDKEngineers.com>
Cc: equest-users at onebuilding.org
Subject: RE: [Equest-users] System 4 - PSZHP Unmet Hours - DOE-2.3

I get zero unmet hours when I run the model in eQUEST 3.65-7174 in DOE-2.3 mode.
The sizing methodology is very different in DOE-2.3. The heat pump models were also updated.
The compliance ruleset for the model could not be found and so was not used. Not sure if that matters.
I think there might be something in the compliance ruleset or elsewhere that is giving very high heating loads, as the system sizes in the DOE-2.3 model are all roughly 3.5 cfm/ft2.
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 Jones, Christopher via Equest-users
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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wsp.com

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 | F: 617.345.4226

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 | F: 617.345.4226

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

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