Mechanical)Systems)) ENGR8903) Winter,2013 · ENGR8903%Mechanical%Systems:%Dr.%Y.%Muzychka...
Transcript of Mechanical)Systems)) ENGR8903) Winter,2013 · ENGR8903%Mechanical%Systems:%Dr.%Y.%Muzychka...
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