# The Zero Electricity Air Cooler : How does it work? [duplicate]

I have seen from a video and a website where they said that, temperature can be reduced by reducing the area where the air passes. But what theory can explain it more precisely? I guess this could be an example of Bernoulli's principle, but I failed to related the temperature with it. Will the process work always ? I mean is there any drawback?

## marked as duplicate by John Rennie, user36790, CuriousOne, Wolphram jonny, ACuriousMind♦Jun 12 '16 at 17:33

• I would like to see a thermodynamic calculation of that, better still, an experimental confirmation. Chinook winds can reach velocities of up to 120km/h while falling 3000m, which, per $m^3$ of air, constitutes a potential energy change of over 30kJ. – CuriousOne Jun 11 '16 at 14:28