https://www.indiegogo.com/projects/waterseer-water-women#/

A really, really, really good idea.

To bad it won’t work.

sibeen said:

https://www.indiegogo.com/projects/waterseer-water-women#/

A really, really, really good idea.

To bad it won’t work.

It might work better in reverse. Extracting water from wet ground.
Oh wait, that’s a well.

sibeen said:

https://www.indiegogo.com/projects/waterseer-water-women#/

A really, really, really good idea.

To bad it won’t work.

Rather than me explain why it can’t work., I’ll lust lay out the framework, as a teacher might. You, pretending to be student, will find it easy to fill in the gaps.

The temperature doesn’t decrease with depth unless ……. in which case …….. or unless …….. in which case ……..

Even if the relative humidity is so high that condensation can occur underground, by simply waiting a few hours you can get very much more condensation on the surface because ……..

They did give villagers in the Andes something that had a wire mesh and a trough below it.
It hardly ever rains in those places but they get heavy mists that roll in from the sea every day.
I think those water collectors work ok.

For a system that does work successfully in mountainous terrain for extracting water from humid air, look up “artificial glacier”. Moisture from the air condeness directly out on the surface of the artificial glacier. The artificial glacier has to be carefully tended, so it’s a fairly labour-intensive operation, but it does work.

Better still, collect rain.

Enthalpy of vaporisation works both ways. It takes approximately 2 MJ of energy to turn 1 kg of water into steam, it therefore also takes the same amount of energy to do the reverse. The video rabbits on about getting nearly 40 litres of water a day. So 80 MJ of energy per day gets injected into the ground. I suspect the ground may heat up a tad.

Aargh..we were going to walk down to Chinatown for tea. But it is raining. I think we might just stay in house and eat this time.

Whoops..sorry

Although strangely apposite.

sibeen said:

Enthalpy of vaporisation works both ways. It takes approximately 2 MJ of energy to turn 1 kg of water into steam, it therefore also takes the same amount of energy to do the reverse. The video rabbits on about getting nearly 40 litres of water a day. So 80 MJ of energy per day gets injected into the ground. I suspect the ground may heat up a tad.

Are you sure? Steam is because you are putting energy in and moving the molecules. Stop putting energy in and it condenses, you don’t need to put any energy in to convert it back to water. Or that’s my understanding.

AwesomeO said:

sibeen said:

Enthalpy of vaporisation works both ways. It takes approximately 2 MJ of energy to turn 1 kg of water into steam, it therefore also takes the same amount of energy to do the reverse. The video rabbits on about getting nearly 40 litres of water a day. So 80 MJ of energy per day gets injected into the ground. I suspect the ground may heat up a tad.

Are you sure? Steam is because you are putting energy in and moving the molecules. Stop putting energy in and it condenses, you don’t need to put any energy in to convert it back to water. Or that’s my understanding.

Stop putting energy in and it condenses…so where does the energy that was put in to turn it into steam go?

Yep, it works both ways.

sibeen said:

AwesomeO said:

sibeen said:

Enthalpy of vaporisation works both ways. It takes approximately 2 MJ of energy to turn 1 kg of water into steam, it therefore also takes the same amount of energy to do the reverse. The video rabbits on about getting nearly 40 litres of water a day. So 80 MJ of energy per day gets injected into the ground. I suspect the ground may heat up a tad.

Are you sure? Steam is because you are putting energy in and moving the molecules. Stop putting energy in and it condenses, you don’t need to put any energy in to convert it back to water. Or that’s my understanding.

Stop putting energy in and it condenses…so where does the energy that was put in to turn it into steam go?

Yep, it works both ways.

Into moving the molecules and keeping them moving. No more energy, no more movement.

AwesomeO said:

sibeen said:

AwesomeO said:

Are you sure? Steam is because you are putting energy in and moving the molecules. Stop putting energy in and it condenses, you don’t need to put any energy in to convert it back to water. Or that’s my understanding.

Stop putting energy in and it condenses…so where does the energy that was put in to turn it into steam go?

Yep, it works both ways.

Into moving the molecules and keeping them moving. No more energy, no more movement.

Conservation of energy. The energy put into a system will come back out. It just cannot disappear.

sibeen said:

AwesomeO said:

sibeen said:

Stop putting energy in and it condenses…so where does the energy that was put in to turn it into steam go?

Yep, it works both ways.

Into moving the molecules and keeping them moving. No more energy, no more movement.

Conservation of energy. The energy put into a system will come back out. It just cannot disappear.

Yeah, that sounds familiar as well.

sibeen said:

AwesomeO said:

sibeen said:

Stop putting energy in and it condenses…so where does the energy that was put in to turn it into steam go?

Yep, it works both ways.

Into moving the molecules and keeping them moving. No more energy, no more movement.

Conservation of energy. The energy put into a system will come back out. It just cannot disappear.

https://www.youtube.com/watch?v=nfZ12UGiisM

Yeah thought about it a bit more. Those big cooling towers the energy goes into raising the temperature of the river or lake, cup of coffee into warming the mug etc.

The Rev Dodgson said:

sibeen said:

AwesomeO said:

Into moving the molecules and keeping them moving. No more energy, no more movement.

Conservation of energy. The energy put into a system will come back out. It just cannot disappear.

https://www.youtube.com/watch?v=nfZ12UGiisM

ROFL.

I should bookmark that. It will become useful with a job I’m working on at the moment.

And while we’re you-tubing, have a Second Law of Thermodynamics, with a First Law thrown in for good measure:

https://www.youtube.com/watch?v=VnbiVw_1FNs

The Rev Dodgson said:

And while we’re you-tubing, have a Second Law of Thermodynamics, with a First Law thrown in for good measure:

https://www.youtube.com/watch?v=VnbiVw_1FNs

Conduction, convection and radiation. They really should tech this song in Uni :)

It is not clear to me what the advantage is to burying the reservoir.