how long would it take to heat 25 gallons of water to 170 degrees
imersion heater/cal rod will be used to heat it
2006-11-15 07:02:02 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
a 6000 wat heating element will be used
2006-11-15 07:22:59 · update #1
You just need a few basics to estimate things.
1. 6000 watts is 6 BTU/sec.
2. 1 BTU heats 1 lb of water 1 degree F
3. 1 gallon of water weighs 8.3 lbs.
4. A nominal natural convection heat transfer coefficient is 1 BTU/(ft^2 * hr * deg F)
If you barrel is well insulated, just use the above (except 4) and you will see that 25 gallons will heat at 0.027 deg F per second.
If you arent insulated, you need to use the heat transfer to see what portion of the 6000 watts is lost as the temperature rises. You can readily do this in general form and the result should be an exponentially asymptotic temperature.
2006-11-15 10:07:42 · answer #1 · answered by Pretzels 5 · 0⤊ 0⤋
You need to know the output of the heater and how much heat is lost to the surroundings. Without knowing the output of the heater, the question is impossible to answer. It's like asking how long it will take to fill a 50 gallon drum without saying how quickly the water is coming in.
2006-11-15 15:07:43 · answer #2 · answered by Gene 7 · 0⤊ 1⤋
from what temperature? what pressures are we talking about? how much power is being used to heat the water??
2006-11-15 15:17:59 · answer #3 · answered by igot4onit 2 · 0⤊ 0⤋