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Subramaniyan C FIRST LAW OF THERMODYNAMICS ENGINEERING THERMODYNAMICS
Mechanical Engineering 2ND YEAR UG STUDENTS IN MECHANICAL ENGINEERING BIT (Anna university)
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MICROPLANNING (TIMING OF CLASS)
Values are in minute(s), Starts from Alpha breathing (clockwise)
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ALPHA BREATHING BREATHE IN (DEEPLY) BREATHE OUT (SLOWLY)
HOLD THE BREATH
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Topic for Learning through evocation
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PREREQUISITE KNOWLEDGE
Temperature Various forms of energy closed system law of conservation of energy
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Out-of-class Activity Design -1
Learning Objective(s) of Out-of-Class Activity To examine the moving boundary work or PdV work commonly encountered in reciprocating devices such as automotive engines and compressors (Engineering) To identify the first law of thermodynamics as simply a statement of the conservation of energy principle for closed (fixed mass) systems (Science) To develop the general energy balance applied to closed systems (Engineering) Key Concept(s) to be covered Various forms of energy Closed system Law of conservation of energy
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Taxonomy of Objectives The Cognitive Process Dimension
Knowledge Dimension The Cognitive Process Dimension Remember Understand Apply Analyse Evaluate Create A. Factual Knowledge B. Conceptual Knowledge 2 1 C. Procedural Knowledge 3 D. Meta Cognitive Knowledge Explanatory Notes: (This is not the notes for the topic. It is an explanatory notes to remember the reason for doing a particular mapping in the table above) Factual Knowledge: It is a knowledge that contains the basic element sstudents must know if they are to be acquainted with the discipline or to solve any of the problems in it. Conceptual Knowledge: It includes knowledge of categories and classifications and the relationships between and among them. Procedural Knowledge:It is the knowledge that takes the form of series of logical steps to be followed. It is more skill oriented and can include algorithms, techniques and methods. Meta Cognitive Knowledge:It is the knowledge of one’s own cognition.
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Guidelines for Video Selection - 1
First check in National Repositories NPTEL Videos: ( Second Look in International Repositories Text Book: Thermodynamics: An Engineering Approach Book by Michael A. Boles and Yunus A. Cengel
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Formative Assessment -1
1.An open system is one in which (a) mass does not cross boundaries of the system, though energy may do so (b) neither mass nor energy crosses the boundaries of the system (c) both energy and mass cross the boundaries of the system (d) mass crosses the boundary but not the energy 2. Which of the following quantities is not the property of the system? pressure (b) temperature (c) specific volume (d) heat (e) density 3. Extensive property of a system is one whose value (a) depends on the mass of the system like volume (b) does not depend on the mass of the system, like temperature, pressure, etc. (c) is not dependent on the path followed but on the state (d) is dependent on the path followed and not on the state
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Formative Assessment 1.An open system is one in which
(a) mass does not cross boundaries of the system, though energy may do so (b) neither mass nor energy crosses the boundaries of the system (c) both energy and mass cross the boundaries of the system (d) mass crosses the boundary but not the energy 2. Which of the following quantities is not the property of the system? pressure (b) temperature (c) specific volume (d) heat (e) density 3. Extensive property of a system is one whose value (a) depends on the mass of the system like volume (b) does not depend on the mass of the system, like temperature, pressure, etc. (c) is not dependent on the path followed but on the state (d) is dependent on the path followed and not on the state
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Formative Assessment - 2
(A) volume of an ideal gas at (B) and (C) is compressed adiabatically to (D). It is then cooled at constant volume and further expanded isothermally so as to reach the condition from where it started. calculate all salient points and W,Q, change in path functions. Cp= (E), Cv= (F) (A=0.1m3, B= 300K, C=1 bar, D=8 bar, E=14.3 kJ/kg, F= 10.2 kJ/kg) A heat exchanger receives air at a velocity of (A) and (B). The temperature of air increases to (C) in a heat exchanger. The air then passes through the turbine. The velocity of air while entering the turbine is (A). The air expands in the turbine, where its temperature falls to (D). On leaving the turbine, air passes through the nozzle. The velocity of the air entering the nozzle is (E). The air expands in the nozzle till its temperature falls to (F). the air flow rate of air is 2.5kg/s. Determine a)Rate heat transfer to air in heat exchanger. b) Power output from the turbine. C) Exit velocity of nozzle. (A=25m/s, B= 20oC, C=780oC, D=630oC,E=60 m/s, F= 500oC) A B C D E F 1) +0.05 ( ) +5 ( ) +0.1 ( ) +0.5 ( ) - -0.05 ( ) +10 ( ) ( ) +1 ( ) 2) ( ) +2 ( ) ( ) +20 ( ) +30 ( ) ( ) -5 ( ) +4 ( ) -10 ( ) ( ) +15 ( ) ( ) Submit this Formative Assessment – 2, two hours before the next class
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DISCUSSION
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MIND MAP
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SUMMARY Students are able to understand:
To understand about the first law of thermodynamics
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ASSESSMENT THROUGH STIMULATING QUESTIONS/ANALOGY/NEW IDEAS AND CONCEPTS
Earth is an open system or closed system……?
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REFERENCES Yunus A. Cengel and Michael A. Boles, Thermodynamics - An Engineering Approach in SI Units, Tata McGraw Hill Publishing Company, New Delhi, 2010 P. K. Nag, Engineering Thermodynamics, Tata McGraw-Hill Publishing Company Limited, New Delhi, 2008 T. D. Eastop and McConkey, Applied Thermodynamics for Engineering Technologists, Pearson, New Delhi, 2004
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Thank You
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