A 1/2" male-to-male compressor fitting and anair compressor blowgun(the kind used to blow dust off things) with a 1/2" opening. Common tools that are used to fabricate and assemble your air cannon at home include: Hack saw or cutoff saw ...
Since Win is ~twice Wnet, the OVERALL 'thermal efficiency' of Win/Qh would be ~62% so the more correct measure, coefficent of performance 'heating'(COP) would be ~1.61, which is a lousy heat pump but that is not the purpose of an air compressor. tirwin on September 7, 2008 - 4...