.Buildings.Fluid.HeatExchangers.CoolingTowers.BaseClasses.DryCoolerUA

Information

Block that computes the overall thermal conductance UA, the heat exchanger effectiveness ε, and the heat flow rate Q̇ for a dry cooler.

Main relationships

The overall conductance is computed from the convective heat transfer coefficients on the coolant side hACoo and the air side hAAir as

UA = corUA ⁄ (1 ⁄ hA_coo + 1 ⁄ hA_air),

where corUA is a correction factor that reduces UA in the free-convection regime when the fan is off.

The effectiveness–NTU method is used to compute the heat flow rate transferred from water to air.

Assumptions

• The heat exchanger flow configuration is treated as cross-flow with both streams unmixed.
• The specific heat capacity of air is evaluated at nominal conditions.
• The specific heat capacity of the cooling fluid is evaluated at the inlet temperature.

References

For further documentation, see Buildings.Fluid.HeatExchangers.CoolingTowers.DryCooler.

Contents

Name	Description
Medium	Medium in the component

Revisions

• April 27, 2026, by Michael Wetter:
  First implementation.