.Buildings.Applications.DataCenters.ChillerCooled.Equipment.WatersideEconomizer

Information

This module impliments a waterside economizer model that consists of a heat exchanger and a shutoff valve on each medium side. This waterside economizer model can be used in two different control scenarios:

1. The temperature at port_b2 is controlled by a built-in PID controller and a three-way valve by setting the parameter use_controller as true.
2. The temperature at port_b2 is NOT controlled by a built-in controller by setting the parameter use_controller as false. Hence, an outside controller can be used to control the temperature. For example, in the free-cooling mode, the speed of variable-speed cooling tower fans can be adjusted to maintain the supply chilled water temperature around the setpoint.

Revisions

• April 9, 2021, by Kathryn Hinkelman:
  Moved nominal pressure differences to dpFixed_nominal at isolation valves to avoid redundant declarations and algebraic loops.
• June 30, 2017, by Yangyang Fu:
  First implementation.