Is it more energy efficient to evaporate water or boil it?

AI Thread Summary
The discussion centers on the energy efficiency of evaporating water versus boiling it. The initial calculations suggest that evaporating water requires less energy than boiling it, as boiling involves heating the water to its boiling point first. However, the book claims that evaporating water, even at lower temperatures, can require more energy due to the latent heat involved. The confusion arises from the different contexts of energy usage for drying clothes versus boiling water completely. Ultimately, the conversation highlights the complexities of energy calculations in phase changes.
Drizzy
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Homework Statement


If I have a pot of water that I want to bowl so that there won't be any water left then the energy that I have to add is:

E=c*m*delta T
E=l(vaporization) * m

But if I have wet clothes and want the water to evaporate then the energy needed is:

E=l(vaporization)m

So from the equations it would take ess energy to evaporate water than to boil it and then make it into a gas. But my book is saying that it takes more energy to evaporate water right away

Homework Equations

The Attempt at a Solution

 
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"L," latent heat, is larger for the lower temperature.
 
Word-for-word, what exactly does your book say?

Chet
 
the book is in another language so I have to translate it.

"The clothes will dry even if it is near 0 degrees celsius, it just requires a little more energy.
 
Drizzy said:
the book is in another language so I have to translate it.

"The clothes will dry even if it is near 0 degrees celsius, it just requires a little more energy.
See Bystander's answer in post #2.
 
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