[Equest-users] System 4 - PSZHP Unmet Hours - "undefined" thermostat schedules
umesh atre
umeshatre at gmail.com
Wed Feb 14 09:13:30 PST 2018
Thanks Bill. Guess I need some more coffee :)
On Wed, Feb 14, 2018 at 9:49 AM, Bishop, Bill <bbishop at pathfinder-ea.com>
wrote:
> 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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> 134 South Fitzhugh Street
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> bbishop at pathfinder-ea.com <wbishop at pathfinder-ea.com>
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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> 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/>
>
> 70 Fargo Street, Suite 800 | Boston, MA 02210
> <https://maps.google.com/?q=70+Fargo+Street,+Suite+800+%7C+Boston,+MA+02210&entry=gmail&source=g>
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> Electronic Communications Disclaimer
> <http://www.nv5.com/contact-us/electronic-communications-disclaimer/>
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>
>
> *From:* Jones, Christopher [mailto:Christopher.r.Jones at wsp.com]
> *Sent:* Wednesday, February 14, 2018 8:14 AM
> *To:* 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
>
>
>
> 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
>
>
>
> T +1 416-644-0252 <(416)%20644-0252>
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> wsp.com
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>
> *Please consider the environment before printing...*
>
>
>
>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
> <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; Rybl, Vicki <
> 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> 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
> <https://maps.google.com/?q=70+Fargo+Street,+Suite+800+%7C+Boston,+MA+02210&entry=gmail&source=g>
> | P: 857.221.5943 <(857)%20221-5943> | F: 617.345.4226 <(617)%20345-4226>
>
>
>
> Electronic Communications Disclaimer
> <http://www.nv5.com/contact-us/electronic-communications-disclaimer/>
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>
>
> *From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
> <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
> *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> 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
> <https://maps.google.com/?q=70+Fargo+Street,+Suite+800+%7C+Boston,+MA+02210&entry=gmail&source=g>
> | P: 857.221.5943 <(857)%20221-5943> | F: 617.345.4226 <(617)%20345-4226>
>
>
>
> Electronic Communications Disclaimer
> <http://www.nv5.com/contact-us/electronic-communications-disclaimer/>
>
>
>
>
>
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