Chris Morrell has an impressive write up on all the ins and outs of building a phase change cooling system. Vapor refrigeration moves heat from one area to another by changing the phase of the working fluid. Chris used propane as the working fluid in his system. He’s got instructions covering all of the work involved from brazing the copper tubes, to building and lapping the evaporator blocks, to the final tuning. With no load it’s can hit -45DegC.
This story reminded me to check back on extremecorvette’s cascading cooler from last fall. He started receiving parts last month for a brand new design. I can’t wait to see how that turns out.
[via Paul Stamatiou]