[Equest-users] System 4 - PSZHP Unmet Hours

[John Aulbach]

 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:  
 
  <!--#yiv4999889663 _filtered #yiv4999889663 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv4999889663 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv4999889663 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv4999889663 #yiv4999889663 p.yiv4999889663MsoNormal, #yiv4999889663 li.yiv4999889663MsoNormal, #yiv4999889663 div.yiv4999889663MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;}#yiv4999889663 a:link, #yiv4999889663 span.yiv4999889663MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv4999889663 a:visited, #yiv4999889663 span.yiv4999889663MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv4999889663 span.yiv4999889663EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;}#yiv4999889663 .yiv4999889663MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered #yiv4999889663 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv4999889663 div.yiv4999889663WordSection1 {}-->#yiv4999889663 .yiv4999889663style1 {font-family:"Times New Roman";}
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
 
70 Fargo Street, Suite 800 | Boston, MA 02210 | P: 857.221.5943 | F: 617.345.4226
 
  
 
Electronic Communications Disclaimer
 
  
 

_______________________________________________
Equest-users mailing list
http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
To unsubscribe from this mailing list send  a blank message to EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20180213/9bd25423/attachment-0002.htm>