- #1
rosaliexi
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Hi, I'm working on a process control question about a tank system at steady state. The part I'm having problems with is where I have derived a second order differential equation to model the system and have replaced the concentrations with derivation constants in that :
Actual Concentration at output (Ca) - Ideal Concentration at output (Cas) = Difference in Concentration at Output (Ca*), etc.
What I am struggling with is the Laplace transform of the equation; I need to know the value of Ca* and dCa*/dt at time = zero. To me, both will be zero, as at steady state Ca = Cas since the system has been running for a period of time. No information is given about this in the question that I can figure out, but I have done the transform several times and I can't get it to work.
Any help would be brilliant.
Thanks,
Rosie
Actual Concentration at output (Ca) - Ideal Concentration at output (Cas) = Difference in Concentration at Output (Ca*), etc.
What I am struggling with is the Laplace transform of the equation; I need to know the value of Ca* and dCa*/dt at time = zero. To me, both will be zero, as at steady state Ca = Cas since the system has been running for a period of time. No information is given about this in the question that I can figure out, but I have done the transform several times and I can't get it to work.
Any help would be brilliant.
Thanks,
Rosie