modelFlowSetpoint

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.MinimumFlowBypass.FlowSetpoint. It shows the calculation of the minimum chilled water flow through the operating chillers.

It includes three instances staUp, staDow, and onOffStaUp that show the minimum chilled water flow setpoint when the plant is staging up, staging down, and staging up with one chiller being enabled and another chiller being disabled.

• For instance staUp, the plant stages up at moment 1 second, It stages up from chiller 1 and 2, to also enable chiller 3. When in the staging process, all the up devices have been controlled uUpsDevSta=true at 1.2 seconds, the minimum flow setpoint changes from 0.01 m3/s (sum of minimum flow of chiller 1 and 2) to 0.015 m3/s (sum of the minimum flow of all chillers). The staging process takes 1.5 seconds (byPasSetTim).
• For instance onOffStaUp, the plant stages up at moment 1 second. It enables chiller 3 and disables chiller 2. When in the staging process, all the up devices have been controlled uUpsDevSta=true at 1.2 seconds, the minimum flow setpoint changes from 0.01 m3/s (sum of minimum flow of chiller 1 and 2) to 0.015 m3/s (sum of the minimum flow of all chillers) at 2.7 seconds. When the chiller staging process are done (uSubCha=true), the minimum flow setpoint changes back to 0.01 m3/s (sum of minimum flow of chiller 1 and 3).
• For instance staDow, the plant stages down at moment 1 second. It stages down from chiller 1 and 2, to disable chiller 2. When in the staging process, all the up devices have been controlled uUpsDevSta=true at 1.2 seconds, the minimum flow setpoint changes from 0.01 m3/s (sum of minimum flow of chiller 1 and 2) to 0.005 m3/s (the minimum flow of chiller 1). The staging process takes 1.5 seconds (byPasSetTim).

Components

Revisions

• March 28, 2019, by Jianjun Hu:
  First implementation.