Cooling Tower Fans/Cells Effect on Outlet Temp

[SloFlo]

Does anybody know how to calculate the change in cooling tower oultet temperature should one cell go out of service? This is assuming everything else is held constant.
Thanks,

 

[Jobst]

You should have performance curves for a single cell based on air and water flow/properties. Now increase the flow through a single remaining cell by the flow lost through the single cell divided by the number of remaining cells, and hopefully you're still within the boundaries of prediction.