In reply to Alberto De Souza's message of Sat, 21 Mar 2015 01:33:55 -0400: Hi, [snip] > >Actually, the resistence of heating wires varies very little with >temperature. In the case of Kanthal A-1 (that MFMP was using), it increases >by a factor of only 5% from 100 to 1400 degress Celsius (see >http://kanthal.com/en/products/material-datasheets/wire/resistance-heating-wire-and-resistance-wire/kanthal-a-1/). >So, considering a high COP (3), this control-variable variance (the wire >resistance in the reactors) is negligible. > >Alberto.
This assumes that the chemical composition of the wires remains constant. A coating of Al &/or absorption of Hydrogen could both change the resistance. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
