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The Science behind Water Cooling

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actorindp

Registered
Joined
Oct 21, 2001
Location
NY
I'm doing a Science project on water cooling. And I need to find the science behind the Evaporative cooling tower, and the radiator cooling method. Any sources, and help would be GREATLY appreciated!

-Nick
 
OP
A

actorindp

Registered
Joined
Oct 21, 2001
Location
NY
Well I guess I want to be explain
how the evaporative cooling tower actually works, heat disapation.

And also how the heat transfer takes place in a radiator witha fan strapped to it

-Nick
 

Iron Hawk

Member
Joined
Jan 19, 2002
Location
Groton, CT
actorindp said:
And also how the heat transfer takes place in a radiator witha fan strapped to it

my understanding is that the fins on the rad. absorb the heat from the water like a giant heatsink, and the air moving past them "blows" the heat away (like a giant heatsink).
 

Tiger

Member
Joined
Apr 6, 2001
Location
UK
actorindp said:
Well I guess I want to be explain
how the evaporative cooling tower actually works, heat disapation.

The cooling effect of a tower is based on the Latent Heat of Vapourisation. The latent heat of vapourisation is the amount of energy required to convert 1g of water to water vapour at the same temperature. An example is your kettle. When it boiling the water will remain at 100C unti all the water is converted to vapour. The amount of energy required heat 1g of water by 1C is 1 Joule but the amount of energy required to convert 1g of water to vapour is 540 Joules. In a cooling tower the higher energy water molecules are converted to water vapour by absorbing energy from surrounding molecules. The molecules that "donate" this energy are then depleted of energy and are therefore colder. If you go and do a serach under the heading of cooling towers you will find a lot of info on this process.
And also how the heat transfer takes place in a radiator witha fan strapped to it
The heat is transfered from the water to the metal radiator by conduction and then from the metal surface by forced convection.