heat rate calculation
heat rate calculation
(OP)
I have a pipe in which the internal water flow heats up at 20 deg C per hr. The pipe is 3" thick carbon steel, with 3" of insulation in a 22 deg C room, with known thermal conductivities. How do you go about finding much the carbon steel pipe lags behind the water in heating up?





RE: heat rate calculation
The solution requires a 2-dimensional transient analysis. Not a particulary easy thing to do. It might be possible to to a 1-dimensional approximation by descritizing the length dimension into small slices (this is essentially what an FEA program would do).
In a nut-shell, the how-to is "conservation of energy equations". Energy in = Energy out + Temperature Gain x specific heat.
RE: heat rate calculation
Then the problem can be reduced to a one dimensional transient. Closed form solutions with the steel and insulation will be difficult to solve.
I therefore recommend numerical solutions.
RE: heat rate calculation
Is there flow in the pipe or stagnant liquid or well mixed liquid?How is the temperature increased uniformly and is it the bulk temperature? give some details.
RE: heat rate calculation