.Buildings.DHC.Plants.Cooling.Subsystems.CoolingTowersWithBypass

Information

This model simulates parallel connected cooling tower subsystem with a bypass valve.

The bypass valve is controlled to enforce that the leaving condenser water temperature does not drop below the minimum temperature TMin.

By default, the condenser water setpoint is the ambient wet bulb temperature TWetBul plus the approach temperature dTApp.

Inside the model, a cooling tower fan speed controller is also implemented to maintain the condenser water at its setpoint.

Revisions

• January 2, 2023, by Kathryn Hinkelman:
  Set dp_fixed = 0 for the bypass valve because the pressure drop in this leg will be significantly less than the cooling towers.
  Propagated riseTime for the valve signal filters.
• November 16, 2022, by Michael Wetter:
  Changed rise time of valve to 30 seconds so that it is the same as the one for the pumps, and set use_inputFilter = false for shut-off valve in cooling tower. This avoids a sharp rise in pressure near t=35 seconds.
• May 19, 2020 by Jing Wang:
  First implementation.