I won't name it otherwise this will look like shilling. The gist is that it uses a flexible solar panel (included) to power a small fan and TEG which chills the incoming air, then the condensation drips down into the bottle and you have water to drink.
It is indeed filtered to keep out dust, bugs, etc. but not chemical contaminants, so you don't want to use it in the city.
They claim under ideal conditions it will produce 27 ounces of water per hour. Ideal conditions being 86-104 degrees F, 80-90% humidity.
What sort of performance is realistic under more moderate conditions? Could this be worth the weight or is it more meme gear like the biolite?
The most popular version seems to be meant to be mounted on a bicycle. The convection that will be produced thanks to the speed of the bicycle is probably going to help a lot.
It's not trivial to calculate exactly how efficient it will be under different conditions, but obviously it is going to be more efficient the higher the temperature and the higher the humidity. If we for the moment assume that the peltier device is extremely cold we get a higher limit in that the volume of water is proportionate to the absolute humidity. Now, obviously 27 ounces per hour is under the best conditions they tested it in, so probably 40 degrees centigrade (104F) and 90% relative humidity. The ambient absolute humidity is then around 50g/kg. Now your moderate conditions might be 20C (~70F) with 70% humidity. The ambient absolute humidity at this point is around 10g/kg. So with our approximation, it would under these conditions produce around 5 ounces per hour.
Note that this is a best-case approximation. In all likelihood when it's colder, the condensation is going to be less efficient and the panel will produce less juice for the peltier device. At lower temperatures it's going to be virtually useless.
>What sort of performance is realistic under more moderate conditions? Could this be worth the weight or is it more meme gear like the biolite?
Its a meme /scam
its just far far far to energy inefficient.
compare it to pic related.
This thing is a lot bigger (like half a washing machine)
This thing only Produces ~24L/ a day or 1L /hr of water.
This thing consumes 500 Watts per hour to do so.
This things uses a far superior cooling cycle system.
[Peltiers are like 10 time less efficient compared this liquid based using stuff like R134a]
This thing is bigger and thus has scaling advantages.
so lets calculate.
solar means 12hr of use on a day with perfect sunlight = 12L
make it 10 times smaller to compare it to the bottle system = 1.2L per 12 hours.
therfore 1/10 equal to 50Watts per hour instead of 500W
This leads us to the summary that this system wold produce 100ml water per hour for 50 Watts.
so to get 500 ml water in 10 hour you would need a bit less then 25 Watts for the entire time. looking at amazon this would be a solar panel of 50 cm x 38 cm or 20 x 15 inches big.
BUT this system is 10!!!! fucking times more efficient in heat exchange and condensation then the Peltiers systems used in the bottle. Which once their heat sink gets warm will lose even more efficiency!
So its actually of 10 these solar panel because of the Peltiers inefficiency
Also this is under the products best conditions 40°c and upwards of 90% humidity... sooo like in the fucking rain Forrest
TL:dr i am very very skeptical of the claims, compared to current technology it doesn't add up in the physic department