Cooling in a Cooling Tower: Oper. Conds Tab

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range:

Variable	Default Value	Range

○ Cold Water (Output) Temperature (°C)	25.0	Positive
○ Air Wet Bulb Temperature (°C)	15.0	Positive
● Temperature Range (°C)	0.0	Positive
● Approach Temperature (°C)	15.0	Positive
○ Water Loading (m³/m²-h)	14.4	3-22.5
○ Water to Air Input (wt/wt)	0.75	Positive
● Max Water to Air (wt/wt)	0.0	Positive
● Evaporating Water (kg/h)	0.0	Positive
● Cooling Duty (kcal/h)	0.0	Positive
● Fan Power (kW)	0.0	Positive
● Pump Power (kW)	0.0	Positive
○ Pump Efficiency	0.80	0.0 –1.0
● Air Inlet Stream Indicates the input port that is connected to the air inlet stream. If an input stream is already present at the selected port, then the button next to the selection is active. Click on the button to bring up the attached stream’s simulation dialog in order to provide the composition of the material being charged.	<None>	Dedicated Input Port
● Humidity at Air Inlet (wt water/wt air)	0.0	Positive
● Humidity at Air Outlet (wt water/wt air)	0.0	Positive

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Specification Choices / Comments

In rating mode the Water to Air Input, and Water Loading are calculated by the model. The following variables are always output variables: Range, Approach, Max. Water to Air, Evaporating Water Rate, Cooling Duty, Pump Power, Fun Power, Humidity of Air In, and Humidity of Air Out. For more details on how these variables are implemented, see Cooling in a Cooling Tower: Modeling Calculations.