Max Heat input to a metal
Max Heat input to a metal
(OP)
I have a heater which gives out 1500 Watts at full output.
I have a block of metal say SS which I am trying to heat. I am trying to figure out the max temperature it will reach when the heater is used.
Formula: Q=m*cp* (T(final)-T(initial))
Tinitial=25C, C(specific heat)= 0.5KJ/kg-K, m=15 kg, q=1500Watts*time, T final?
Substituting all I get,
Tfinal=27 C in 10 sec.
In 500 sec, Tfinal is 125C.
I am a bit confused. I am trying to figure whats the max temperature the block can reach with that heater. This formula shows there is a linear increase of temperature with time and goes to infinity. Obviously thats not possible. It will reach a max temperature and plateau. What am I doing wrong?
( assume ideal conditions -no heat loss etc..)
Please help.
I have a block of metal say SS which I am trying to heat. I am trying to figure out the max temperature it will reach when the heater is used.
Formula: Q=m*cp* (T(final)-T(initial))
Tinitial=25C, C(specific heat)= 0.5KJ/kg-K, m=15 kg, q=1500Watts*time, T final?
Substituting all I get,
Tfinal=27 C in 10 sec.
In 500 sec, Tfinal is 125C.
I am a bit confused. I am trying to figure whats the max temperature the block can reach with that heater. This formula shows there is a linear increase of temperature with time and goes to infinity. Obviously thats not possible. It will reach a max temperature and plateau. What am I doing wrong?
( assume ideal conditions -no heat loss etc..)
Please help.





RE: Max Heat input to a metal
Look at the specific heat capacity its in kJ, I think you need to put it in J's so multiply it by a 1000.
desertfox
RE: Max Heat input to a metal
And, therein lies your answer. The maximum temperature of your SS block cannot be any higher than the maximum temperature of the heater by itself.
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RE: Max Heat input to a metal
RE: Max Heat input to a metal
RE: Max Heat input to a metal
RE: Max Heat input to a metal
Your analysis did not include any heat loss, that is why your block continued to raise in temperature.
RE: Max Heat input to a metal