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I have been thinking about this for a while so I thought I would just throw it out there. As Cartman says,"feel free to kick me in the nuts" if you think it wont work. Please don't say it wont work without some back up.
I have some solid 2400W heating elements. They are about 200mm long and 12mm in diameter. A solid little stainless steel rod that gets bloody hot.
They get so hot they are not really usable for anything but heating water. But then I thought the heat is distributed over that tiny area. What if I put that element inside a stainless steel pipe of either 51mm or 38mm or 25mm sealed on one end and filled it with a suitable medium to get the heat to the surface of the pipe and evenly distributed.
Here are the calculations.
Surface area of a cylinder is A=2πrh+2πr2
Element = 77cm2 = 2400/77 = 31W/cm2
51mm pipe X 270mm = 473cm2 surface area of pipe = 2400W/473cm2 = 5.07W/cm2 @ 2400W.
38mm pipe x 270mm = 345cm2 = 6.95W/cm2 @ 2400W.
25mm pipe x 270mm = 221cm2 = 10.86W/cm2 @ 2400W.
By rights a value of 5.07watts per square cm2 is not really that hot but immersed in a wash would still deliver the full 2400 watts to the wash but not burn anything/grain. Am I right? Or have I missed something here?