modelReduceDemand

Information

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

It has two instances as below to demonstrate the process of reducing chiller demand when the plant is in the staging process.

The instance chiDemRed shows the process of reducing the chiller demand when the plant starts staging up.

• Before 90 seconds, the plant is not in staging process. There is no change to the chiller demand and it is not requiring demand reduction (yChiDemRed=true)).
• At 90 seconds, the staging process starts and it requires reducing the chiller demand (uDemLim=true, yChiDemRed=false). It requires reducing the demand by the larger value between chiDemRedFac (75%) and yOpeParLoaRatMin (which is 0.7 in this case), which reduces from 50 A to 37.5 A (yChiDem).
• At 100 seconds, the chiller load becomes 37.5 A, which is less than 80% of the value before the staging (50 A). The demand reducing process is done (yChiDemRed=true).

The instance chiDemRed1 shows the process of reducing the chiller demand when the plant starts staging up. The process requires enabling a large chiller and disabling a small chiller.

• Before 90 seconds, the plant is not in staging process. There is no change to the chiller demand and it is not requiring demand reduction (yChiDemRed=true)).
• At 90 seconds, the staging process starts and it requires reducing the chiller demand (uDemLim=true, yChiDemRed=false). It requires reducing the demand by the larger value between chiDemRedFac (75%) and yOpeParLoaRatMin (which is 0.7 in this case). It requires reducing both chillers demand from 50 A to 37.5 A (yChiDem).
• At 100 seconds, both chillers load becomes 37.5 A, which is less than 80% of the value before the staging (50 A). The demand reducing process is done (yChiDemRed=true).

Components

Revisions

• September 26, 2019, by Jianjun Hu:
  First implementation.