Introduction; Cooling tower is totally misunderstood and is orphan products. As cooling word is related to it, HVAC people have taken place of its good father.
Principle of Cooling Tower : Cooling Tower does not work on principle of refrigeration. It really works on adiabatic/Evaporation precept. Hence it works on mass transfer, heat switch is simply by product of mass transfer. If there is no such thing as a mass switch, no evaporation, there is no heat switch of all and therefore no cooling.
Water cannot be cooled with less than 30C approach. Hence cold water temperature achievable shall be 30C and greater than wet bulb temperature of air. Wet bulb temperature thought-about ought to be precise wet bulb temperature entry of entering air into cooling tower, not atmospheric wet bulb.
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Precise wet bulb coming into in cooling tower i effected because of many factors. Heat supply near cooling tower, air movement of cooling tower is hindered; recycling because of size of tower and orientation of tower in respect to wind stream.
We shall focus on above factors in particulars now:
1. What is Cooling tower?
Basically cooling tower is process water recycling gear, the place scorching water is cooled to a atmospheric temperature, as a consequence of evaporation of fraction of circulating water (1 to 2%) which comes involved with circulating air and remaining (99 to 98%) water cools to cold water temperature, and is recycled in system. Water lost is added as make up water.
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2. Does Cooling tower cools the water?
Cooling tower isn’t a refrigeration machine; it can’t cool water if there is no such thing as a heat input in system or temperature rise of system. Cooling tower will cool sizzling water to atmospheric temperature solely. Fall in cooling tower temperature shall be identical as rise in system.
3. Cooling tower makes use of fan power, after which it must cool higher than cooling tower without fan, natural draft or fanless one?
Fan shouldn’t be appearing as compressor. It offers mechanical motion to air. It increases G/L ratio. Therefore efficiency of fan kind tower may be greater than natural draft tower. Nevertheless it can not cool water less than atmospheric conditions.
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4. As much as what temperature cooling tower can cool water?
Chilly water temperature from cooling tower relies upon upon primarily wet bulb temperature and cooling vary.
Wet bulb is the bottom theoretical temperature, which the water may be, cooled. Practically the cold water temperature approaches however does not be equal to wet bulb temperatures, because some drive is required for evaporation of water. This drive i.e. temperature difference between cold water temperature and W.B.T. is named approach. Minimum method (drive) is 30C.
Actual approach shall depend upon cooling tower design, primarily air to water contact and contact time. This approach, therefore chilly water temperature relies upon upon vary additionally. Method is proportions to vary. As for larger vary (more heat to be launched per kg of water) more evaporation charges are required. Therefore extra drive is required. Therefore more method is required.
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