# Produce energy from air

by elone
Tags: energy, produce
 P: 11 Sun shining on earth and make it warm but its not warm enough to make energy of it What happend to air molkols when it getting hot? Why we can concentrate light by miror whitout spend energy but we cant do it on air? We need power to compres air to make it warmer and we can use it to produce energy I say if we can change the propertice of hot molkol to less hots , energy will concetrate and transfered to nighber molkols Do you think its posible? Sorry for my bad english
Mentor
P: 9,655
molkols? Do you mean molecules?
In hot air, those molecules are moving faster.

 Sun shining on earth and make it warm but its not warm enough to make energy of it
Solar thermal energy and solar updraft towers (just prototypes) exist.

 Why we can concentrate light by miror whitout spend energy but we cant do it on air?
Air is not light. The molecules in hot air have a random motion, while sunlight comes from one direction only.
 P: 11 I dont mean lighting energy i asking to transmite random motion energy to other moulkoles of air Yes im new on english language sorry about that
Mentor
P: 9,655

## Produce energy from air

 i asking to transmite random motion energy to other moulkoles of air
That is not possible in an "ordered" way, as the motion is completely unordered.
 P: 2 I think what you mentioned is referred as a classic example against the second law of thermodynamics.
 P: 11 No i say use sun energy from air temperture
 Mentor P: 9,655 As jiayue9 and me explained, this is not possible. You would need some colder material nearby to extract useful energy.
 P: 49 Like mfb said there is a way of extracting energy directly from heat but it requires a difference in temperatures between two sides. It is called the Thermoelectric effect you can read it on wikipedia. www.wikipedia.com/wiki/Thermoelectricity
P: 11
 Quote by dbmorpher Like mfb said there is a way of extracting energy directly from heat but it requires a difference in temperatures between two sides. It is called the Thermoelectric effect you can read it on wikipedia. www.wikipedia.com/wiki/Thermoelectricity
This is all about my poor english language
I know we can not use this low temp of air for produce energy
I know if we try to compres air it use more energy than it produce
I say sun did not spend energy to mix with air so maybe we can take shining energy out, without using energy.
Can we ?
 Mentor P: 9,655 What is "shining energy"? Solar cells use the solar radiation to extract energy. If you do not want to use that, you have to heat something to a higher temperature (above the temperature of the environment). Sunlight can do this, and I linked two concepts which use that.
P: 11
 Quote by mfb What is "shining energy"? Solar cells use the solar radiation to extract energy. If you do not want to use that, you have to heat something to a higher temperature (above the temperature of the environment). Sunlight can do this, and I linked two concepts which use that.
Sunshine have energy right? It come from sun right? When it crash to earth make it warm right? And it make air warm, yes? I try to find other way (not direct from sunshine) to use this energy i asking to explore energy from air mulecols
Mentor
P: 9,655
 Sunshine have energy right? It come from sun right? When it crash to earth make it warm right? And it make air warm, yes?
Right.

 I try to find other way (not direct from sunshine) to use this energy i asking to explore energy from air mulecols
All those methods were mentioned here.
P: 11
 Quote by mfb What is "shining energy"? Solar cells use the solar radiation to extract energy. If you do not want to use that, you have to heat something to a higher temperature (above the temperature of the environment). Sunlight can do this, and I linked two concepts which use that.
You speak abut ways that exist i looking to find new way
 Mentor P: 9,655 Right, and I told you that there cannot be a completely new way. The laws of physics do not allow that.
 P: 11 I say sunshine did not spend energy to mix with air so maybe we can take shining energy out, without using energy. Can we ?
Mentor
P: 9,655
 I say sunshine did not spend energy to mix with air
If you don't build anything special, hot air mixes with the remaining air.
 so maybe we can take shining energy out, without using energy.
There is no "shining energy".
 Can we ?
No.
P: 11
 Quote by mfb If you don't build anything special, hot air mixes with the remaining air. There is no "shining energy". No.
Shining energy is translate from my language it mean heat that transfer by light
 Mentor P: 9,655 Thermal radiation? Okay, that does not change my points.

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