lecture_23_after

lecture_23_after - CHE 220 Introduction to Chemical...

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1 CHE 220 Introduction to Chemical Engineering Thermodynamics Lecture 23: Systems in Steady Flow The first law for open systems Steady state energy balance Steady state vs. equilibrium examples
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2 Chemical plants have mass flow across boundaries. What makes this system open? What about heat, work crossing boundaries?
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3 Mass flows are related by conservation of mass.
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4 Energy flows are related by conservation of energy. cool leak s Q m h m h Q W m h + + = + + 6 6 4 4 1 1 Steady state energy balance for this system Steady state: Equilibrium: Units: (kJ/mol)*(mol/hr) cool leak s Q m h m h Q W m h + + = + + 6 6 4 4 1 1 Energy In = Energy Out
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5 The first law for open systems accounts for energy crossing boundaries due to mass flow. IN – OUT = ACCUM dm dx A Consider one inlet Kinetic energy: Potential energy: Internal energy: Work:
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6 The open system energy balance takes energy effects from all streams into account. dm
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lecture_23_after - CHE 220 Introduction to Chemical...

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