ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Mechanical  Systems    ENGR  8903  Winter,  2013  Dr.  Y.  Muzychka  

EN  3058  

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Course  Outline  •  Major  Topics  Covered:  – System  Modelling  

– OpJmizaJon  – System  SimulaJon  – Thermodynamic  OpJmizaJon  

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•  Grade  Scheme:  – Assignments  (3-­‐4)  10%  

– Project          20%  – Midterm        20%  – Final  Exam        50%  

ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Important  Dates  •  Dates  to  remember:  –  January  7th,  Lectures  Begin  – February  18th  –  20th,  Mid  Term  Break  – February  14th,  Midterm  –  January  31st,  Project  Part  1  is  Due  – February  28th,  Project  Part  2  is  Due  – April  2nd,  Project  Part  3  is  Due  – Assignments:  January  31,  February  28th,  March  28th    

– April  5th,  Lectures  End  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

IntroducDon  to  Thermal  Design    and  OpDmizaDon  

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Thermal-­‐Fluid  System  Design  •  Manufacturing  and  Materials  Processing  Systems  •  Energy  Systems  •  Electronics  Cooling  Systems  •  Environmental  and  Safety  Systems  •  Aerospace  Systems  •  TransportaJon  Systems  •  HVAC  Systems  •  Piping  Systems  •  Thermal  Equipment  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Workable  versus  OpDmal  Systems  •  Workable   System:   is   a   soluJon   to   a   given   problem  which  

performs   the   desired   task   within   some   set   of   prescribed  criteria.  

•  OpDmal   System:   is   one   in   which   the   desired   task   is  performed   within   some   set   of   prescribed   criteria,   but   for  which   a   parJcular   variable   of   interest   such   as   cost   or  energy  input  are  minimized,  or  in  other  cases  where  profit  and  energy  output  are  maximized.  

•  Nearly  OpDmal   System:   implies   that   there   is   some   give   in  the   value   of   the   opJmizaJon   variable,  which   provides   for  an   opJmal   soluJon   under   which   some   of   the   condiJons  may   be   relaxed   without   imparJng   a   huge   penalty   on   the  objecJve  funcJon.  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

System  IdenDficaDon  •  System:  consists  of  mulJple  units  or   items  which  interact  with   each   other   to   perform   the   desired  task.  

•  Sub-­‐Systems:   are   complete   parts   for   which   a  system  may  be  sub-­‐divided.    

•  Components:  are  independent  units   in  which  the  interacJon   between   its   consJtuents   is   either  absent  or  unimportant.  

•  Process:   refers   to   the   technique  or  methodology  used  in  achieving  the  the  desired  goal.  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

System  IdenDficaDon  System:  Simple  Steam  Power  GeneraJon  Plant  

Components:  Boiler,  Turbine,  Condenser,  Pump,  and  Piping  

Process:  Rankine  Steam  Cycle  

•  In  the  ideal  analysis  model,  each  of  the  four  thermodynamic  states  are   known,   and   it   becomes   a   simple   exercise   to   find   the   power  generaJon  and  thermal  efficiency.  

•  In   an   actual   system   analysis,   real   component   behaviour  (performance)   is  required  to  calculate  the  state  points  and  hence  find  the  power  generaJon  and  thermal  efficiency.    

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Design  Process  Flow  Diagram  

•   Two  other  examples  in  lecture  notes.  

•   No  one  diagram  is  more  or  less  correct.  

•   This  course  focuses  mainly  on  block  3.      

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Example  -­‐  1  •  Using   simple   methods   determine   the   opJmal  locaJon   of   the   circuit   board   which   generates   a  constant   heat   rate   Q   with   mean   board  temperature   Tw,   such   that   either   the   heat  transfer  rate  is  maximum  for  fixed  temperature  or  temperature   is   minimum   for   fixed   heat   transfer  rate.  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Example  -­‐  2  •  For   the   second   example,   we   will   examine   a   closed   loop  

liquid  cooled  electronics  system.  The  system  consists  of  the  following   components:   a   pump,   a   liquid   cooled   heat   sink,  an   air   cooled   heat   exchanger,   a   storage   vessel   for   the  coolant,   and  piping   for   circulaJng   the   coolant.   In  order   to  undertake   a   system  analysis  we  need   the   characterisJc  of  each   component.   Individually,   we   could   analyze   or   obtain  the  following  informaJon  for  each  component:  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Example  -­‐  3  •  Let  us  examine  the  simplest  thermal  power  generaJon  cycle  examined  in  thermodynamics.  The  basic  thermal  power   plant   consists   of   five   components:   a   pump,   a  boiler,   a   turbine,   a   condenser,   and   the   piping  connecJng  all  of  these  components.  

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ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka  

Example  -­‐  3  14  

•  Energy  wheel  for  the  simple  power  plant.    

ENGR  8903  Mechanical  Systems:  Dr.  Y.  Muzychka