Closed water saving system

clipped from www.eng.uwaterloo.ca Pete's Homemade Air Conditioner Credit goes out to Pete H. in sunny England for this great build. This version of the homemade air conditioner removes the need to drain water outside by using an aquarium pump, and sits on a rotating base. Pete did a much neater job of attaching the copper tubing to the front of the fan than I did. Using copper tubing on both the front and back of the fan is a great idea, the more copper tubing, the more heat exchange possible. Here we can see the aquarium pump submerged in the ice water. Pete aims to increase the power of the pump, and replace the polystyrene container with something more permanent. A small freezer with its heat vented to the outside would be ideal.