Hmmmm, I suppose you make a good point there
. I just know that a lot of fellas in the distilling forums I frequent (just out of curiosity, I swear
) have issues with grain washes and direct element contact.
Ok, so assuming that it should work, do my element sizing maths sound right?
total water mass = 6 gallons*3.75 L/gal *1000g/L = 22500g
thermal capacity of water: 4.19*J/(C*g)
So total thermal inertia = 94.3kJ/C
typical thermal differential to boil: 100*C-60*C = 40*C
So total energy needed = 40*94.3KJ =3,771,000J
Given a warmup time of 20 minutes = 1200 seconds, you'd need a wattage of 3.77M/1200 = 3142 watts...dang, that's pretty high for a 15 amp circuit (some might even say impossible)! Never mind any losses due to poor insulation. With a 1250 watt elements, that's looking at a 50 minute wait time to get to boiling.
Ok then, given 1250 watts, what is the evaporation rate?
Enthalpy of vaporization ~ 2100KJ/Kg
1.250/2100 = .0006Kg/sec = .6g/sec = 2.16L/hour
Well....Dang. Looks like without a 20 amp circuit, or preferably a 220V circuit, an internal element probably won't work too well. Curses, I've been foiled again!