Cooling Tower Range and Approach Relationship

[Pointedstud]

Hello folks, got a question regarding cooling tower I will like to understand.

I got some performance data from some cooling tower makers on the condition of how the cooling tower will operate at different wet bulb temperature.

Assumeing flow and fan power is constant, what i observe was the cooling tower's approach data at a lower wet bulb temperature at design range, is actually greater than at a higher wet bulb.

Why is that so ? Aint it suppose to be at a lower wet bulb temperature it should be equal to design approach ( example @ 3 degC) why will it be higher than ? any reason ?

 

[Asymptotic]

I'm having trouble following your question, but the answer probably involves tower loading.
Marley used to print an excellent primer on cooling towers; it looks like what they (as SPX Cooling) have posted online is equally valuable.

TR-16 "Cooling Tower Approach" ought to point you in the right direction.

http://spxcooling.com/library/results/search&keywords=approach/