Tag Keeping cool without electricity

Back in May I wrote this article about building a passive AC. That time I attached it to the front of our living room fan and I found that while the principle worked the air flow was too low to give effective cooling. I also mentioned that I would like to try to fit one in a window to cool down the incoming air. Now, I’ve finally had a chance to test this concept.

The working principle is the same, as the air passes through the funnel it gets compressed which lowers the temperature. Last time I used standard 500 … Read the rest

A while ago I stumbled upon a video showing some people in Bangladesh who had invented a kind of passive air cooler made from scrap bottles that could help poor people keep cool in the summer, you can read more about it here. I think it’s a neat idea so I figured I would try to build one of my own.  The version shown in the video fits in a window but I figured i could fasten it on the front of a fan for increased effect. This post is a build log detailing the process.

Materials:
As can be … Read the rest