The Stig wrote:A guy bought a 2400W heating element , wired it up without an earth.
Now he’s telling me it won’t make 50l go past 74deg or something like that .
He is telling me I should have sold him a 3600W element because he’s seen on the net that a 2400W will never boil 50l .
And to top that off he’s got a 2” column.
Settle the dispute , who’s right ?
What he is saying is wrong, based on the information we have. You are right.
50L of 12% wash in a naked stainless boiler, starting at 20C, with a 2400W direct immersion heater will take about 100 minutes to boil. Column height and diameter has no effect on boilup time. He should be worried about using an un-earthed installation.
Formula:
TT = 100 * ((v * 8.33 * 453.59237) * (((5 / 9) * (ET - 32)) - ((5 / 9) * (ST - 32))) / (eg * 0.238845896628 * eff)) / 60
Where,
TT = Time to Temperature
v = Volume (Gallons)
ET = End Temperature (Fahrenheit)
ST = Start Temperature (Fahrenheit)
eff = Efficiency
eg = Energy
Example
How long to boil 2 L of water with 2000 W energy, efficiency 19 %, start and end temperature of 20 and 100 degree celsius?
Water Heating / Boiling Time = 29 min.
This is for 100% water, water/ethanol mixtures have lower boiling points dependant on their ratio.
2400w can be easily supplied from a standard Aussie 10A outlet, assuming a quality extension lead is used. 3600w needs a 15 outlet.