I want to build a heatpipe to move heat (30 watts/hr) from the interior of my refrigerator to the exterior of my house
during the winter. I am considering using a 1/2 copper tube capped filled with ethanol, water or acetone. I plan on Adding the fluid (how much?)to the open tube heating one end with a torch and soldering on the second cap to seal the tube and create a vacuum. any ideas would be appreciated.?