.Buildings.Applications.DataCenters.ChillerCooled.Controls.CoolingModeNonIntegrated

Information

Chilled water plant with a non-integrated waterside economizer (WSE) have two cooling modes: free cooling (FC) mode and fully mechanical cooling (FMC) mode. This model determines when to activate FC or FMC for a chilled water system with 2 chillers and 1 waterside economizer.

The FMC mode is activated when

• T_WetBulb≥ T_WetBulb,tran, or
• T_CHWST≥T_CHWSTSet + deaBan,

and the FC mode is activated when

• T_WetBulb< T_WetBulb,tran, and
• numOnChi<2,

where T_WetBulb is the wet bulb temperature of the outdoor air, T_WetBulb,tran is the wet bulb temperature transition point for switching between FC and FMC, T_CHWST is the chilled water supply temperature, T_CHWSTSet is the chilled water supply temperature setpoint,and numOnChi is the number of running chillers.

Revisions

• July 30, 2017, by Yangyang Fu:
  First implementation.