1-Energy Balances_S10

1-Energy Balances_S10 - Energy Balances ChE 202 Spring 2010...

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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Energy Balances ChE 202 Spring 2010
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Retrospective – 1 ± Last Semester ± Material balances ± (Flow + steady-state) or (batch) ± With/out reaction ± Single/multiple units ± Non/ideal gas ± Single-phase or liquid-vapor (equilibrium)
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Retrospective – 2 ± This Semester ± Energy balances ± (Flow + steady-state) or (batch) ± With/out reaction ± Single/multiple phases, phase changes ± Mixing effects ± Unsteady-state balances ± Material and/or Energy
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Review Material Balance Accumulation = flow in flow out + generation consumption Buildup within system Produced Consumed within system Enters Leaves through system boundaries Can use for Simplify for •tota l±stream • individual component •mass •mo les (no generation / consumption terms if total stream + mass) • Continuous (open) + steady-state [ a ċ c = 0] • Batch (closed) [ in = 0 = out => acc = g
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Copyright 2010 D.B. Dadyburjor and J. A. Shaeiwitz Now Energy Balance Accumulation = flow in flow out + generation consumption Buildup within system Produced Consumed within system Enters Leaves through system boundaries Use for total stream only, not individual component No generation / consumption terms Energy in/out terms – associated with streams (material) other contributions: Heat Work (acc) sys = Σ input – Σ output + (in - out) heat + (in - out) work all streams all streams
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Terms in Energy Balance ± ( acc ) sys = Σ input Σ output + ( in - out) heat + (in - out) work all streams all streams ± Associated with streams/material input , output (streams) , accumulation (system) terms in EB -- Kinetic Energy: motion -- Potential Energy: position -- Internal Energy: molecular motion (vibration, rotation, translation) ± Not associated with material in, out (heat , work) terms in EB -- Heat : Energy flow with T as the driving force
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This note was uploaded on 05/14/2010 for the course CHE 102 taught by Professor Dadyburjor during the Spring '10 term at WVU.

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1-Energy Balances_S10 - Energy Balances ChE 202 Spring 2010...

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