Hello! I'm Ilya Platonov here in Moscow and this is my just-made Bangladesh-style Bottle Eco Cooler.
These funnels are the cut-off top parts of five liter water bottles, there are eleven of them onboard. The change in pressure that occurs when air pass from the wider part of the bottle to the bottleneck cools the air.
It really works, I feel the cool! Probably it would be more effective with larger number of smaller bottles but as it works now is pretty enough for me.
Stay tuned!