modelSpeed

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Pumps.CondenserWater.Subsequences.Speed.

The example shows a chiller plant with 3 chiller stages and 6 plant stages. The plant stage means the stage that considers both the chiller stage and the waterside economizer status. The plant stage is specified by the parameter staVec, which in this example is {0, 0.5, 1, 1.5, 2, 2.5}. The element like x.5 means chiller stage x plus enabled waterside economizer. At different plant stages, the number of enabled condenser water pumps and the speed are specified by parameter desConWatPumNum ({0, 1, 1, 2, 2, 2}) and desConWatPumSpe ({0, 0.5, 0.75, 0.6, 0.75, 0.9}).

The process of setting the condenser water pump speed and the pump number is demonstrated as below:

• Before 0.2 seconds, the chiller stage is 0 and the waterside economizer is enabled. Thus, the plant stage is 0.5 (2nd stage), the number of enabled pumps is 1 and the pump speed is 0.5.
• In the period between 0.2 seconds and 0.375 seconds, the chiller stage is 1 and the waterside economizer is enabled. Thus, the plant stage is 1.5 (4th stage), the number of enabled pumps is 2 and the pump speed is 0.6.
• In the period between 0.375 seconds and 0.6 seconds, the chiller stage is 1 and the waterside economizer is disabled. Thus, the plant stage is 1 (3th stage), the number of enabled pumps is 1 and the pump speed is 0.75.
• In the period between 0.6 seconds and 0.75 seconds, the chiller stage is 2 and the waterside economizer is disabled. Thus, the plant stage is 2 (5th stage), the number of enabled pumps is 2 and the pump speed is 0.75.
• After 0.75 seconds, the chiller stage is 2 and the waterside economizer is enabled. Thus, the plant stage is 2.5 (6th stage), the number of enabled pumps is 2 and the pump speed is 0.9.

Components

Revisions

• August 4, 2019, by Jianjun Hu:
  First implementation.