modelDisableChiller

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Staging.Processes.Subsequences.DisableChiller. It shows the substeps of disabling chillers when the plant is in the staging down process.

The instance chiOnOff shows how to enable and disable chillers when the staging down process requires one chiller to be enabled and another chiller to be disabled. The instance chiOff shows how the chiller is disable when the staging down process does not require other chiller to be enabled.

For the instance chiOnOff, initially the plant has chiller 1 and 2 operating. When staging down, it requires chiller 3 being enabled and chiller 2 being disabled.

• Before 540 seconds, it does not require the plant to stage down (uStaDow=false). The chiller 1 and 2 are operating, and the chiller 3 is not operating.
• At the period between 540 seconds and 720 seconds, the plant is in the staging down process. However, the process is not yet requiring the chiller to be enabled or disabled, as uEnaChiWatIsoVal=false.
• At 720 seconds, the staging down process requires chiller 2 to be disabled and chiller 3 to be enabled (nexEnaChi=3, nexDisChi=2). The chiller 3 becomes enabled.
• At 1020 seconds, which is 5 minutes after enabling chiller 3 (specified by proOnTim), chiller 2 becomes disabled and the chiller demand limit can be released (yRelDemLim=true).

For the instance chiOff, initially the plant has chiller 1 and 2 operating. When staging down, it disables chiller 2.

• Before 540 seconds, it does not require the plant staging down (uStaDow=false). The chiller 1 and 2 are operating, and the chiller 3 is not operating.
• At 540 seconds, the plant starts staging down (uStaDow=true). The chiller 2 is disabled immediately.

Components

Revisions

• September 24, 2019, by Jianjun Hu:
  First implementation.