They are going for the old "We are saving the world, back us now, it's not thermodynamically impossible, and we'll reveal the data to backers once we get the money" trick.
Dave, you only busted this gadget for the case that they use Peltier cooling, as this kind of heat pump got a COP of around 1 or less only.
Although their proto design pictures indicate the usage of Peltier elements, they state, that these pictures do not reflect their actual solution..
What Stebanoid and me were saying, that due to general Thermodynamic Laws, this product can not work at all with these form factors (of solar panel and cooler).. in other words, their claims indirectly violate the laws of physics, similar to all these Perpetuum Mobile and "Free Energy" freaks.
The efficiency of heat exchanger, condenser and solar panel further reduce this COP factor, so their claims fall short by an order of magnitude, at least, but in a more fundamental way.
Of course they are using Peltier elements!
You are falling for their BS as they desperately gasp for breath trying to justify their claims.
Ok, fine, another argument entirely. I have not looked into that.
Not sure why you are taking me to task over it?
A paper on this:
http://www.psipw.org/attachments/article/273/IJWRAE_1%282%29142-145.pdf
They got 1L of water per hour from a 120W panel with elements of 450mm x 15mm each side and a 6000rpm 15cm fan in a high humidity environment.
Good luck Fontus.
I would have thought that it would be more efficient to do as several people here have siad, that is cool the air to dew point to extract the water, then pass it over the hot side to "recover" the energy.
A paper on this:
http://www.psipw.org/attachments/article/273/IJWRAE_1%282%29142-145.pdf
They got 1L of water per hour from a 120W panel with elements of 450mm x 15mm each side and a 6000rpm 15cm fan in a high humidity environment.
Good luck Fontus.
It seems to me that they have the system in that paper "backwards".
They heat the incoming air before cooling it to condense out the water. If I read the paper right, they heat it to increase the amount of water vapour it can hold. This is irrelevant, as they are not adding any additional water vapour - all they are doing is increasing the amount of heat that has to be removed in the cooler part to drop the temperature to dew point. I would have thought that it would be more efficient to do as several people here have siad, that is cool the air to dew point to extract the water, then pass it over the hot side to "recover" the energy.
fig2 shows the air being cooled to condense water then passed over the hot side to help cool it
fig2 shows the air being cooled to condense water then passed over the hot side to help cool it
Dave, in order to produce water from steam you have to take energy out of steam, not to bring it. You have to take 250 W from the freezer in the bottle - it's a different case.
Is the collected water safe for drinking?
Unfortunately, besides the water collected, dehumidifiers collect all sorts of airborne particles, including mould spores, viruses, pollen, bacteria and so on, making it unfit for consumption. There are dehumidifiers on the market designed for this purpose, usually called something like “Air to water” appliances, but these have special filters designed to remove dust and UVC lamps to kill the germs to make the water suitable for consumption.
Dave, in order to produce water from steam you have to take energy out of steam, not to bring it. You have to take 250 W from the freezer in the bottle - it's a different case.
I completely agree with this post.
I don't know why anyone would think I was talking about using the peltier to put energy in and heating it up the air?
In this case they just don't seem to know what they are doing (but who knows).
Couldn't the product work a lot better if they used the wheel of the bike as a power source? I think that should generate around 200Wh of power per hour of power which would at least be a huge upgrade from that tiny crap solar panel they are planning on using.
Relevant video
It makes you wonder where you can go for reliable information - products like this and Batteriser winning awards, some of them from purported technical publications. Clearly they are handing out these awards based on "it looks cool" not anything scientific. And of course when the average person who lacks the ability to actually analyze these things sees that it won an award from what is supposed to be an authority on the technical details, they jump right in and back the campaign. If I were REALLY cynical I'd say it was all collusion.