just to sum up whats come previously:
Boyntonstu wrote:Blowing air around a smooth compressor housing will provide little or no cooling. (no fins)
rp181 wrote:Agreed. Fans are pointless. Not only do you not have fins, but they put on a nice smooth gloss finish for you. In addition to that, these are potted, epoxy does not conduct heat well at all.
here's my setup, compressor, 2 x 150mm 40W fans, datalogging meter with thermocouple wedged into compressor shell with thermal grease.
Two fans weren't really necessary here but I needed them to drop the voltage.
for the experiment the compressor was operated for 1 hour with and without the fans, furthermore after running without fans the fans were switched on to see how quickly they could cool the runnung compressor. I've pletted delta T, the temperature rise above ambient for clarity:
As you can see with the fans on the compressor hardly heats up even after 1 hour of continuos use. It's a different story without the fans, the temperature rises steadily throughout the experiment, after 1 hour it's 25 degrees centigrade above ambient and still rising. When the fans are turned on the cooling effect is massive and very fast.
I really don't see how anybody reading these results can any longer say that fans are not an effective method of cooling this type of compressor.