3 replies to this topic

[djack77494]

shen,
It is asking too much to think that a cooling system can be designed by a responder based on the provided information. Let's look at some simplistic answers to your most important questions.

I'm working through your questions backwards. Your electricity costs are due largely to powering the fan(s) as well as the circulating pump(s). Don't neglect to add some extra water capacity for a sidestream filter. Everything needs a driving force, so you never reach equilibrium conditions. The closer your approach, the more you'll pay for it in equipment and operating costs. You can attempt to get close to your minimum water temperature = wet bulb temperature of 13.3C. Let's say you design for 15C for your cool water temperature. Your approach to wet bulb is 15 - 13.3 = 1.7C. Now say you circulate enough cooling water to accomplish all your cooling needs while heating the water to only 20C. Regarding your exchanger, your approach is 25 - 20 = 5C, which is a bit low but still in the realm of reasonable. Though I've never used this term, the cooling range is 20 - 15 = 10C. There is no simple equation for calculating air flow. Beginning with the air's inlet temperature AND humidity, you can lookup or calculate its enthalpy. Same for exiting air saturated at (say) 15C. By energy balance, the energy given up by your water = energy gained by air. Only unknown is the air flowrate, so calculate it. Energy removed is the water flowrate * Cp * (Tout - Tin). Finally, your Issue 1 concerning the equation for power consumption by the fan(s). The equation you provided is an empirical equation and constants "A" and "B" must be provided by the fan manufacturer.

[breizh]

Good day Shen ,
Let you do some "google" work .There is a document issued by SPX "Cooling towers-fundamentals "which may help you to answer your queries.
Pierre

[bhumin2511]

how to find out cooling tower Total power consumption ?

power consumptopn of pump and fan both..


i am waiting for accurate reply