We still could work that part out by calculating how many liters of air at 20-40% humidity hold 1 liter of water, and knowing that the device will stop working when humidty is at 10%, so we get a volume of air and calculate the fan power needed to move that air through the device.
But I guess we’re just overdiscussing the topic here. Guess that I’m a bit skeptycal on this team because they were using a Peltier cell in their first prototype, but overall they’re just interested with the matherial’s properties and how to better exploit them, and not so much with the practical aspect on why harvesting water from the air is a energy intensive method and that kind of defeats the purpose of obtaining water from the air in places where there’s no water supply, since the energy required to obtain water from the air also is sorely lacking in those same places.
“So you live in an arid region and your crops are about to die because of a drought? Mmkay, let’s just plug this device into the nearest megawatt-rated power station and you’ll get enough water from the air to save your crops!”
“But sir, if we had a megawatt rated power station, then we could afford to pump water from a lake 150 km away from here…”
“Oh b*tch!”
It’s like the OP, instead of transporting water or electricity, he suggest to transport hydrogen to obtain water and electricity, but transporting hydrogen is dangerous and more difficult than actually transporting water or electricity, essentially because hydrogen is viciously explosive when mixed with air. As chemists joke, “flammable gasses have a tight proportion of gas to air in which they might explode, whereas hydrogen has a tight proportion of gas to air in which it might not explode unless it feels like it”.