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List of Dodgy Crowd Source Funded Projects

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McBryce:

--- Quote from: brucehoult on May 10, 2021, 01:15:49 pm ---
--- Quote from: thatawesomeguy on May 10, 2021, 12:30:05 pm ---Another water from the air device..

https://www.indiegogo.com/projects/kara-pure-turning-air-into-drinking-water--2/coming_soon

https://karawater.com/

--- End quote ---

Why not? I've had a device at home for many years that is rated to extract I believe 25 litres of water a day from air, though I think that's at 25 C and 80% humidity which I don't have. I think in practice its extracting about 10 litres a day, using 8 kW/h of electricity to do so. I then throw the water away as the purpose is to make the room more comfortable both by reducing the humidity and by pumping out about 800 W of heat from 330 W of electricity.

--- End quote ---

Wow, how can you get 800W of heat from 330W of electricity?

McBryce.

Labrat101:

--- Quote from: McBryce on May 10, 2021, 01:58:09 pm ---
--- Quote from: brucehoult on May 10, 2021, 01:15:49 pm ---
--- Quote from: thatawesomeguy on May 10, 2021, 12:30:05 pm ---Another water from the air device..

https://www.indiegogo.com/projects/kara-pure-turning-air-into-drinking-water--2/coming_soon

https://karawater.com/

--- End quote ---

Why not? I've had a device at home for many years that is rated to extract I believe 25 litres of water a day from air, though I think that's at 25 C and 80% humidity which I don't have. I think in practice its extracting about 10 litres a day, using 8 kW/h of electricity to do so. I then throw the water away as the purpose is to make the room more comfortable both by reducing the humidity and by pumping out about 800 W of heat from 330 W of electricity.

--- End quote ---

Wow, how can you get 800W of heat from 330W of electricity?

McBryce.

--- End quote ---
I think that some one is mixing up  W/o work output with W as in Watts  .. As a Heat Pump is only at best 80% efficient  . Depending on RH%, Dew point,
and ambient Temp . and  a few other factors ..
A regular example 1HP Home split AC on a Good day can extract about 3Lts per hour . but if the windows etc are closed this will drop to maybe 1Ltr/Hr. or Less
No Free energy unless plugged into next doors Fuse Box  :-DD

 :popcorn:

brucehoult:

--- Quote from: McBryce on May 10, 2021, 01:58:09 pm ---
--- Quote from: brucehoult on May 10, 2021, 01:15:49 pm ---
--- Quote from: thatawesomeguy on May 10, 2021, 12:30:05 pm ---Another water from the air device..

https://www.indiegogo.com/projects/kara-pure-turning-air-into-drinking-water--2/coming_soon

https://karawater.com/

--- End quote ---

Why not? I've had a device at home for many years that is rated to extract I believe 25 litres of water a day from air, though I think that's at 25 C and 80% humidity which I don't have. I think in practice its extracting about 10 litres a day, using 8 kW/h of electricity to do so. I then throw the water away as the purpose is to make the room more comfortable both by reducing the humidity and by pumping out about 800 W of heat from 330 W of electricity.

--- End quote ---

Wow, how can you get 800W of heat from 330W of electricity?

McBryce.

--- End quote ---

Water heat of vaporisation at 21 C is about 680 Wh/kg.

All the electricity going into the dehumidifier obviously turns into heat. The excess 800-330 = 470 W of heat is explained if it is condensing 470/680 = 0.7 litres of water an hour.

That's perfectly feasible for a typical domestic dehumidifier.

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