would something like this work - closed loop cooling ?

[joeymac]

So here's a YouTube vid showing a guy with a homemade air conditioner... basically just a box fan blowing through copper tubing with ice water pumping through the tube.
https://youtu.be/3V93Gh3Q2Ro" onclick="window.open(this.href);return false;" rel="nofollow

Now, forget the ice water and think of this in reverse...

A 5 gallon bucket full of room temperature water with an aquarium pump recirculating water from the bucket through the condenser head and then through the box-fan-heat-exchanger thing and then back into the bucket. I've often thought of trying to find a right sized automotive radiator for this purpose but never thought of just using 1/4-3/8" copper tubing. Would this shed enough heat to make a good recirculating coolant loop? You would have to be shedding probably 2-4kw of heat for it to be useful. But a fan and pump are going to draw under 1.5 amps of electric... so it's pretty trivial in terms of cost to do.

Anybody doing this? Anybody doing the same thing with a radiator or finned tubing?