Lec17

# Lec17 - ME 200 Thermodynamics I Lecture 17 Control volume...

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ME 200: Thermodynamics I Lecture 17: Control volume analysis - energy conservation Sections 4.4, 4.5 Problems: SP17; 4.24, 4.25 Professor Hukam Mongia Office Hours: MWF 2:30 to 3:30 pm in ME 83 (Other times email for appointment) Email: [email protected] Phone: 765-494-5640 Course Website: https://engineering.purdue.edu/ME200 Course Secretaries: Diana Akers (ME 84) and Marilyn Morrison (ME 100) See Kul Inn (ME 189) about grading Homework Assignments 9/29/09 Problem answers: 4.24: (a) 0.621 kg/s, (b) 52.23 m/s, (c) 6.82 kW; 4.25: (a) 26.89 kg/h, (b) 89 o C Prof. Lucht's lecture notes modified 1

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This Lecture First Law of Thermodynamics Open Systems 9/29/09 2 CV CS Inlet Exit CV CV m t t E t t e m CV CS Inlet Exit CV CV mt Et i m
9/29/09 3 Reactor (Cookies Belt) Reactants Products Is it continuous or batch product? Start with reactants at time t Product comes out at time t+ d T

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First Law of Thermodynamics for Closed Systems First Law of Thermodynamics Closed Systems : General Form Q W U KE PE ,: Neglect KE PE Q W U : Per unit mass q w e : Differential form q w de E 2 -E 1 =Q-W
9/29/09 5 Energy/Mass Balance Equations for Open Systems (Control volumes) Steady-state? For single inlet and single outlet? Specific energy balance equation?

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CV CS Inlet Exit Consider a closed system that contains a fixed quantity of mass m. At time t , the mass in the closed system is distributed between the control volume and an inlet to the control volume: i CV m m m t CV CV mt Et i m For the closed system that contains the total mass m: 2 1 2 CV i i i i E t E t V m u g z Conservation of Energy Control Volume Analysis for an Open System 9/29/09 6 Prof. Lucht's lecture notes modified
CV CS Inlet

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Lec17 - ME 200 Thermodynamics I Lecture 17 Control volume...

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