modelMappingWithoutWSE

Information

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

The instances fixPumSpe and varPumSpe show the control of the plants with the fixed speed condenser water pump and the variable speed condenser water pump, respectively.

• In instance fixPumSpe, the condenser water pump speed is fixed.
  • 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 head pressure control valve setpoint yHeaPreConVal resets from 100% to the minimum position minHeaPreValPos (0.1).
• In instance varPumSpe, the condenser water pump speed is variable.
  • 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 condenser water pump speed setpoint yConWatPumSpeSet resets from the design condenser water pump speed desConWatPumSpe to the minimum speed minConWatPumSpe (0.1).
• 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.