modelEnableCWPump

Information

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

It has two instances staUpInd and staDowInd, which shows the calculation of the chiller stage index in the staging up and staging down process.

For the instance staUpInd,

• Before 540 seconds, the plant is not in the staging up process. The chiller stage yChiSta equals the previous stage setpoint, which is 1.
• In the period from 540 seconds to 720 seconds, the plant is in the staging up process, but the process is not yet requiring changing the condenser water pumps (uUpsDevSta=false). The chiller stage yChiSta still equals the previous stage setpoint (1) but not yet equals the new setpoint uStaSet (2).
• Since the 720 seconds, the process requires changing the condenser water pumps (uUpsDevSta=true). The chiller stage yChiSta equals the new setpoint uStaSet (2).

For the instance staDowInd,

• Before 540 seconds, the plant is not in the staging down process. The chiller stage yChiSta equals the previous stage setpoint, which is 2.
• In the period from 540 seconds to 720 seconds, the plant is in the staging down process, but the process is not yet requiring changing the condenser water pumps (uUpsDevSta=false). The chiller stage yChiSta still equals the previous stage setpoint (2) but not yet equals the new setpoint uStaSet (1).
• Since the 720 seconds, the process requires changing the condenser water pumps (uUpsDevSta=true). The chiller stage yChiSta equals the new setpoint uStaSet (1).

Components

Revisions

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