Cooling-tower approach calculator

Tower approach measures how far the leaving water remains above the entering-air wet-bulb temperature.

Units

\text{Approach} = T_{\text{cold}} - T_{\text{wb}}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

\text{Approach} = 83 - 75 = 8

Symbol	Meaning	Unit
$\text{Approach}$	approach temperature	°F
$T_{\text{cold}}$	leaving tower water temperature	°F
$T_{\text{wb}}$	entering-air wet-bulb temperature	°F

Symbol	Meaning	Unit
$\text{Approach}$	approach temperature	K
$T_{\text{cold}}$	leaving tower water temperature	°C
$T_{\text{wb}}$	entering-air wet-bulb temperature	°C

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.