It's so obvious that this wont work, you don't need to know anything about heat exchangers.
The outside wind will be at lower pressure than the air inside the hole in the ground, so the air won't be able to be pumped into the hole from outside by the stupid little wind-powered fan. Also, hot air won't want to be pushed down, it will obviously want to rise.
Also, if you did manage to create an air flow circuit with some kind of clever pressure differentials, flowing air won't be in the ground long enough to cool down and condense.
There's no way to force hot air down into the hole, keep it there to exchange its heat with the ground, and allow water to condense out.....all without application of external power.
Not gonna happen.
Hell even if you had a powered fan that could force the hot air down, and the water DID condense out, it wouldn't take long for the water to re-evaporate, so you'd pretty much have to harvest the water within a few hours of it condensing. I guess you could get a few cups of water out early in the morning at best...but 11 liters a day? Good Lord how stupid.