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The performance of a Cooling Tower is measured the amount of it dissipates the heat and make the wider difference from hot water falling from distribution deck to the water at the end of the fall i.e. cold water basin, so Wider delta T better is the performance. Again it dependes on whether you have forced darft, induced draft or telescopic gravity high rise towers. I am not aware about the design you are in. The effect of ambient air plays important role to evaporate the finer water droplets to take away the heat from the water droplets and again the size of the droplets with the location of the tower and wind direction change during the year around.. So you will appericiate, certain engineering parameters are to be known, before we can come forward to help you.
In cooling tower most of the heat transfer is of radiation/ vapourisation of inler hot water,rest heat transfer if of conduction & convection.In Rainy/Summer in normal air water-vapour is more so evaporation rete will less.But in winter watervapour is less in atmospheric air, so rate of evaporation will be more.Naturally in Winter Cooling tower Efficiency will be more.
