The point is that this is a fog harvesting device; it collects tiny droplets of water in the air efficiently. Fog is where you have > 70% (roughly) humidity, even if its only for a period of time.
Deserts have highly variable humidity, often 10-30% during the day, and great at night; maybe 50% ... but you dont get fog in deserts, or, for that matter, in many other places.
In some very specific regions, like Ethiopia, where you have misty mountainous regions; this is a useful device (see the article for the other very misty locations they talk about deploying this in).
If you put it in your backyard, you'll probably get a tiny trickle from it occasionally, unless you live in Wales.
Deserts have highly variable humidity, often 10-30% during the day, and great at night; maybe 50% ... but you dont get fog in deserts, or, for that matter, in many other places.
In some very specific regions, like Ethiopia, where you have misty mountainous regions; this is a useful device (see the article for the other very misty locations they talk about deploying this in).
If you put it in your backyard, you'll probably get a tiny trickle from it occasionally, unless you live in Wales.
The refrigerative water generators (http://en.wikipedia.org/wiki/Atmospheric_water_generator) can work in places with relatively low humidity; these ones do not.