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Evaporative Cooling Concept In Cooling Towers And Swamp/evaporative Ai

evaporative cooling swamp coolers perspiration human body cooling cooling towers

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#1 sparsha

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Posted 23 September 2016 - 12:13 AM

Hi All

I am trying to understand the concept of evaporative cooling. In cooling tower, due to evaporative cooling hot water gets cooled. In this case the energy for latent heat of vaporization is taken from the water itself and air becomes hotter.

 

In swamp/air coolers we use at home, how air gets cooled instead of water itself? What is driving the water molecule to take the required latent heat from air instead of water.

 

The above also applies to our human body perspiration and subsequent cooling of human body.

 

Please clarify.

 

Vijay



#2 samayaraj

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Posted 23 September 2016 - 11:37 AM

Hi,

 

In cooling towers, generally hot water temperature will be higher than air. Hence air will get heated up due to evaporated water at operating temperature. In air coolers, air temperature will be higher than water temperature. Hence evaporated water will cool the air. The driving force here is the partial pressure of water vapor.

 

The same is applicable to human body. As the body temperature raised, sweat is formed and is coming out of our body. It gets evaporated and cools human body. During more humid condition, sweat will not evaporate instead it will fall down and fails to cool down our body. As it continues, we get dehydration.



#3 breizh

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Posted 24 September 2016 - 02:10 AM

hi ,

hope the attachment will be helpful for Forum members.

Breizh



#4 sparsha

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Posted 25 September 2016 - 11:27 PM

Hi Samayraj

Thanks for the response. In cooling towers vs air coolers the higher temperature fluid provides the required latent heat. But my confusion comes from the perspiration example. Let's say outside temperature is 45 deg C. In that case air temperature would be definetly higher than our body temperature. Even now why the latent heat is taken from body instead of air? Hope i didn't confuse more!!

 

Breizh

thanks for the info. 



#5 samayaraj

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Posted 26 September 2016 - 11:17 PM

Evaporation of water creates cooling. In cooling tower hot water takes heat from water itself and in air cooler it takes heat from wet wick for evaporation. Like that, in perspiration heat is taking from human body. In all the conditions, no where heat is taken from the air. Air is getting heated/ cooled due the interacting with hot water or wet wick and not because of latent heat.


Edited by samayaraj, 26 September 2016 - 11:18 PM.


#6 sparsha

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Posted 06 October 2016 - 01:40 AM

Thanks Samayraj. Now my concept is cleared.






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