Pset_CoolingTowerPHistory Cooling tower performance history attributes. IfcCoolingTower IfcCoolingTower Capacity The capacity of the element. Heat transfer rate of the cooling tower between air stream and water stream. Capacity HeatTransferCoefficient Heat transfer coefficient-area product. Heat Transfer Coefficient SumpHeaterPower Electrical heat power of sump heater. Sump Heater Power UACurve UA value. As a function of fan speed at certain water flow rate, UA = f ( fan speed). UACurve Performance Water temperature change as a function of wet-bulb temperature, water entering temperature, water flow rate, air flow rate, Tdiff = f ( Twet-bulb, Twater,in, mwater, mair). Performance