WineGlass wrote:Sorry brendan, I forgot your still only holds 4.99 litres.
Brendan wrote:WineGlass wrote:Sorry brendan, I forgot your still only holds 4.99 litres.
Haha, but I only distill dirty water and make lavender oil :shhh:
Geoff wrote:I would a think good method is heating from a well stabilised ambient of any known temperature to boiling. I don't think that starting from some warm temperature and heating to a small temperature above this is reliable. My reasononing is that convection currents in hot water are quite significant, and will give an inaccurate measurement of water temperature if a simple spot measurement is taken. There is also likely to be similar large temperature gradients through the body of water.
If you start from some known well-settled ambient, then heat to boiling, the energy input will be esier to judge. Sure, the onset of boiling is somewhat hard to judge, but just wait for a racing boil. This is how you would time an electric system anyway. Then just use the formula
Q=mass*4180*(100-Tambient) to give total joules (correct for altitude by adjusting boiling point of 100 deg if needed), then use Q/time=power
mass in kg
T in degrees celcius
power in watts
crow wrote:With all due respect , sound good til you take away one measurable factor. EG like myself uses gas and how to even roughly estimate the btu's on an adjustable hp reg would be near impossible, I guess if you could you could then equate that to wattage
Geoff wrote:Q=M*4180*(100-T ambient) to give total joules (correct for altitude by adjusting boiling point of 100 deg if needed), then use Q/time (s) = Power
Q = energy in joules
M = Mass in kg
T = Temp in degrees celcius
P = Power in watts
t = Time in seconds
Geoff wrote:I would a think good method is heating from a well stabilised ambient of any known temperature to boiling. I don't think that starting from some warm temperature and heating to a small temperature above this is reliable. My reasononing is that convection currents in hot water are quite significant, and will give an inaccurate measurement of water temperature if a simple spot measurement is taken. There is also likely to be similar large temperature gradients through the body of water.
If you start from some known well-settled ambient, then heat to boiling, the energy input will be easier to judge. Sure, the onset of boiling is somewhat hard to judge, but just wait for a racing boil. This is how you would time an electric system anyway. Then just use the formula
Q=mass*4180*(100-Tambient) to give total joules (correct for altitude by adjusting boiling point of 100 deg if needed), then use Q/time=power
mass in kg
T in degrees celcius
power in watts
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