[Equest-users] System 4 - PSZHP Unmet Hours

Wed Feb 14 07:26:25 PST 2018

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 | 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:* 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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> 2300 Yonge Street, Suite 2300
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> wsp.com
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> *Please consider the environment before printing...*
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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 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 | 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/>
>
>
>
> *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 | 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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