modelMappingWithWSE

Information

This example validates Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.HeadPressure.Subsequences.MappingWithWSE. It demonstrates the setpoints control based on the output from the head pressure control loop.

The instances witWSE and noWSE show the control when the waterside economizer is enabled and disabled respectively.

• In instance withWSE, the economizer is enabled. Thus, the maximum tower speed setpoint and the condenser water pump speed setpoint are equal their maximum, which is 1. The head pressure control valve position yHeaPreConVal resets from 100% open at 0% loop output to minimum position minHeaPreValPos (0.1) at 100% loop output.
• In instance noWSE, the economizer is disabled.
  • When the loop signal uHeaPreCon changes from 0 to 50%, the maximum cooling tower speed setpoint yMaxTowSpeSet resets from 100% to the minimum speed minTowSpe (0.1).
  • When the loop signal uHeaPreCon changes from 50% to 100%, the water pump speed setpoint yConWatPumSpeSet resets from the stage desConWatPumSpe (0.75) to the minimum speed minConWatPumSpe (0.1).
  • The head pressure control valve is fully open.
• For both instances, when the head pressure control loop becomes disabled, the head pressure control valve is fully closed; the maximum tower speed setpoint and the condenser water pump speed setpoints become 0.

Components

Revisions

• April 1, 2019, by Jianjun Hu:
  First implementation.