In fluid bypass mode, portion of the water goes through the tower media and gets cooled while the remaining water flow gets bypassed, two water flows then mix together trying to meet the tower exiting water setpoint temperature. For part-load operation, the model assumes a simple linear interpolation between two steady-state regimes without accounting for any cycling losses.įor single speed cooling towers, the capacity control can be fan cycling or fluid bypass. The model will also account for tower performance in the “free convection” regime, when the tower fan is off but the water pump remains on. The model can be used to simulate the performance of both single speed and two speed mechanical-draft cooling towers. Cooling tower performance is modeled using effectiveness-NTU relationships for counterflow heat exchangers. The input objects CoolingTower:SingleSpeed and CoolingTower:TwoSpeed provide models for single-speed and two-speed cooling towers that are based on Merkel’s theory (Merkel 1925), which is also the basis for the tower model included in ASHRAE’s HVAC1 Toolkit for primary HVAC system energy calculations (ASHRAE 1999, Bourdouxhe et al. Cooling Towers and Evaporative Fluid Coolers One and Two Speed Cooling Towers and Evaporative Fluid Coolers Overview
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