modelUpEndWithOff

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Staging.Processes.Subsequences.UpEnd.

It shows how the staging up process ends when the process requires one chiller to be enabled and another chiller to be disabled. The instance endUp1 shows the results as below. It stages up from stage 1 which requires smaller chiller 1 to be enabled, to stage 2 which requires larger chiller 2 to be enabled and chiller 1 to be disabled.

• Before 1000 seconds, the plant is not in staging up process (uStaUp=false).
• At 1000 seconds, the plant starts staging up (uStaUp=true). However, it does not yet starts the subprocess of ending the staging process (uEnaChiWatIsoVal=false).
• At 1125 seconds, the ending process starts (uEnaChiWatIsoVal=true). The chiller 2 is enabled (uChi[2]=true, uChiWatReq[2]=true, uConWatReq[2]=true).
• After 300 seconds at 1425 seconds, the chiller 1 becomes disabled (uChi[1]=false). The chiller 1 becomes not requiring the chilled water and condenser water (uChiWatReq[1]=false, uConWatReq[1]=false). It starts slowly closing the chilled water isolation valve of chiller 1.
• After 300 seconds (chaChiWatIsoTim) at 1725 seconds, the chilled water isolation valve of chiller 1 is fully closed. The head pressure control of chiller 1 becomes disabled (yChiHeaCon[1]). The chilled water minimum flow setpoint changes to the new setpoint. The ending process is done (endStaTri=true).

Components

Revisions

• September 30, 2019, by Jianjun Hu:
  First implementation.