L/G ratio in Cooling Tower

Start by defining "L/G ratio".

L/G ratio is ration of Quantity of water circulated to flow of air passed through the Cooling tower.

But I dont know the effect of Variation of same on Performance of Cooling tower.

All cooling towers seek to make the temperature of the L the same as the wet bulb temperature of the G. If the L temperature is too high and these is still some approach to be made to the G wet bulb temperature, increasing the flowrate of the G using some kind of forced draught equipment is desirable, up to the limit of beginning to spray both water droplets and legionella pneumophila all over the district. Above that limit, larger cooling towers are required.

Dear Mr.sabapara

L/G RATIO for Cooling Tower defined by Mr.Merkel and also known as MERKEL RATIO

This Ratio decides the Cooling Tower Character and also decides the Size and Operational Parameters. The Approach Temp. is to be decided first in relation to the Wet Bulb Temp.

Higher the Wet Bulb Temp. and Closer Approach Temp to Wet Bulb Temp. means the VOLUME of AIR to be Blown/Circulated through the Cooling Tower by way of Induced Fan or Forced Fan or combination of both will be very high. This means L/G ratio is small and expensive in terms of Initial Cost and Operational Cost.

A graph is to be drawn and seek optimum L/G Ratio, for max. Economy for Initial Cost and Operational Cost.

DHAYANANDHAN.S