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set point not met for the period of 01/04 - 31/09

asked 2024-04-10 08:30:43 -0500

Yagnik's avatar

updated 2024-04-11 03:20:01 -0500

I have assigned the AIrLoopHVAC to all 121 zones in building model. but there in the system node temperature for few zones, there is temperature setpoint has been not met for some zones and for specific period (01/04-31/09). What should be the resason behind this specific behavoiur ?

I have tried to compare flow rate for this zone and the zone with temperature setpoint met, but still is unclear the cause behind it,

is this purely because of Supply air Temperature schedule or ? if yes what should be optimal setpoint and for the same period ,there is higher temperature above cooling setpoint amd lower temperature below heating setpoint toofor the period of six months. I have added schedule below have a look...

  Seasonal Reset Supply Air Temp Sch,
  Through: 3/31,
  For: Alldays,
  Until: 24:00,
  Through: 9/30,
  For: Alldays,
  Until: 24:00,
  Through: 12/31,
  For: Alldays,
  Until: 24:00,

Thanks in advance ... Yagnikimage description

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Hello @rraustad, I have also tried Sizing:System "Type of load to size on" with sensible, latent and total, and if this is because of insufficient specification of the systemto met the load, then this probelm of setpoint not met should be in winter. Thanks in advance...

Yagnik's avatar Yagnik  ( 2024-04-11 03:07:06 -0500 )edit

I have updated the screenshot to the query of the system node temperature setpoint of all the 121 zones. I have set the heating set point to 21 and cooling set point to 24 thoughout the year but suring this period of six month temperature setpoint not met for some of the zones.

Yagnik's avatar Yagnik  ( 2024-04-11 03:15:53 -0500 )edit

@Yagnik can you upload your model to Google Drive, Dropbox, etc. and then share a URL for others to download? That would help others provide better solutions.

Aaron Boranian's avatar Aaron Boranian  ( 2024-04-11 11:58:29 -0500 )edit

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answered 2024-04-18 13:04:03 -0500

The loss of temperature control is likely due to undersized cooling coil(s). You can tell this by looking at a day where the temperature set point is not met and reporting the cooling coil sensible capacity, part-load ratio, air flow rate, etc. where you should see that the coil is operating at maximum capacity. If autosizing, check the Sizing:Zone and Sizing:System objects. If not autosizing, check the coil inputs and selected air flow rate.

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Asked: 2024-04-10 08:30:43 -0500

Seen: 63 times

Last updated: Apr 18