ME2320 Thermodynamics I. Summer I Instructor: Dr. William W. Liou
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1 ME2320 Thermodynamics I Summer I 2016 Instructor: Dr. William W. Liou
2 Syllabus
3 Homework Solutions Format 3
4 How to get, and stay, ahead in this class? Preview Book to Class Review Homework Will it work if I Preview, but not Book to Class? Well, yes, maybe, but
5 Chapter 1 INTRODUCTION AND BASIC CONCEPTS
6 Objectives Identify the unique thermodynamics vocabulary. Review the metric SI and the English unit systems. Explain the basic concepts of thermodynamics such as system, state, state postulate, equilibrium, process, and cycle. Review temperature, temperature scales, pressure, and absolute and gage pressure. Introduce an intuitive systematic problem-solving technique and the format of homework solution. 6
7 Application Areas of Thermodynamics 7
8 1-1 THERMODYNAMICS AND ENERGY Thermodynamics: The science of energy. Energy: The ability to cause changes. thermodynamics stems from therme (heat) and dynamis (power). Conservation of energy principle: During an interaction, energy can change from one form to another (transform) but the total amount of energy remains constant. Energy cannot be created or destroyed. The first law of thermodynamics: An expression of the conservation of energy principle. The first law asserts that energy is a thermodynamic property. Energy cannot be created or destroyed; it can only change forms (the first law). 8
9 The second law of thermodynamics: It asserts that energy has quantity as well as quality. Actual processes occur in the direction of decreasing quality of energy. Heat flows in the direction of decreasing temperature. Classical thermodynamics: A macroscopic approach to the study of thermodynamics that does not require a knowledge of the behavior of individual particles (continuum). - EASY Statistical thermodynamics: A microscopic approach, based on the average behavior of large groups of individual particles. NOT EASY! 9
10 1-2 IMPORTANCE OF DIMENSIONS AND UNITS Any physical quantity can be characterized by dimensions. Primary or fundamental dimensions Basic dimensions, such as mass m, length L, time t, temperature T secondary or derived dimensions such as velocity V, energy E, volume V are expressed in terms of the primary dimensions. The magnitudes assigned to the dimensions are called units. 10
11 11
12 Some SI and English Units Force 12
13 Some SI and English Units Energy (such as Work) Work = Force Distance 1 joule (J) = 1 N m 1 calorie (cal) = J 1 Btu = kj Time Rate of Energy (such as Power) Power = Energy/Time 1 watt (W) = 1 J/s 1 horsepower (hp) = 746 W 13
14 Dimensional homogeneity All equations must be dimensionally homogeneous. Every term in an equation must have the same unit. Unity Conversion Ratios LAST page! Unity conversion ratios are identically equal to 1 and are unitless, and thus such ratios (or their inverses) can be inserted conveniently into any calculation to properly convert units. 14
15 1-3 SYSTEMS AND CONTROL VOLUMES System: A quantity of matter or a region in space chosen for study. Surroundings: The region outside the system Boundary (------): The real or imaginary surface that separates the system from its surroundings. fixed or movable. Systems may be considered to be closed or open. piston-cylinder device Closed System (control mass): Fixed amount of mass No mass can cross its boundary No mass + No energy = isolated system. 15
16 Open System (control volume): Encloses a device that involves mass flow o such as compressor, turbine, or nozzle. Both mass and energy can cross the boundary of a control volume. Control surface (-----): The boundaries of a control volume. It can be real or imaginary. 16
17 1-4 PROPERTIES OF A SYSTEM Property: Any characteristic of a system, such as pressure P, temperature T, volume V, and mass m, etc. Properties are considered to be either intensive or extensive. Intensive properties: Values independent of the mass of a system, o temperature, pressure, and density, etc Extensive properties: Values depend on the size or extent of the system. o mass and volume Specific properties: Extensive properties per unit mass. 17
18 1-5 DENSITY AND SPECIFIC GRAVITY Density Specific volume Specific weight: The weight of a unit volume of a substance. Specific gravity (SG): The ratio of the density of a substance to the density of water at 4 C. 18
19 1-6 STATE AND EQUILIBRIUM State: Condition of a system Thermodynamics deals with equilibrium states. Equilibrium: A state of balance with no unbalanced potentials (or driving forces) within the system. Thermal equilibrium: temperature is the same throughout the entire system. Mechanical equilibrium: no change in pressure at any point of the system with time. Phase equilibrium: If a system involves multiple phases and when the mass of each phase reaches an equilibrium level and stays there. Chemical equilibrium: chemical composition of a system does not change with time, that is, no chemical reactions occur. A closed system reaching thermal equilibrium. 19
20 The State Postulate The state of a simple compressible system is completely specified by two independent, intensive properties. Simple compressible system: If a system involves no electrical, magnetic, gravitational, motion, and surface tension effects. 20
21 1-7 PROCESSES AND CYCLES Process: Any change that a system undergoes from one equilibrium state to another. Path: The series of states through which a system passes during a process. A process : initial state, final states, as well as the path it follows, and the interactions with the surroundings. Process Diagram Quasistatic or quasi-equilibrium process: A process proceeds in such a manner that the system remains infinitesimally close to an equilibrium state at all times. 21
22 Some common properties that are used as coordinates are temperature T, pressure P, and volume V (or specific volume v). Prefix iso- designates a process for which a particular property remains constant Isothermal process: A process during which the temperature T remains constant. Isobaric process: pressure P. Isochoric (or isometric) process: specific volume v. Cycle: A process during which the initial and final states are identical. The P-V diagram of a compression process. 22
23 fluid properties within the control volume may change with position but not with time. The Steady-Flow Process steady implies no change with time. Steady-flow process: A process during which a fluid flows through a control volume steadily. A large number of engineering devices operate for long periods of time under the same conditions, and they are classified as steady-flow devices. turbines, pumps, boilers, condensers, and heat exchangers power plants refrigeration systems. mass and energy contents of a control volume remain constant. 23
24 1-8 TEMPERATURE AND THE ZEROTH LAW OF THERMODYNAMICS The zeroth law of thermodynamics: If two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. By replacing the third body with a thermometer, the zeroth law can be restated as two bodies are in thermal equilibrium if both have the same temperature, even if they are not in contact. 24
25 Temperature Scales All temperature scales are based on some easily reproducible states such as the freezing and boiling points of water: the ice point and the steam point. Ice point: A mixture of ice and water that is in equilibrium with air saturated with vapor at 1 atm pressure (0 C or 32 F). Steam point: A mixture of liquid water and water vapor (with no air) in equilibrium at 1 atm pressure (100 C or 212 F). Celsius scale: in SI unit system Fahrenheit scale: in English unit system Thermodynamic temperature scale: A temperature scale that is independent of the properties of any substance. Kelvin scale (SI) Rankine scale (E) A constant-volume gas thermometer would read C, or 0 K, at absolute zero pressure. 25
26 26
27 1-9 PRESSURE Pressure: A normal force exerted by a fluid per unit area Some basic pressure gages. 27
28 Absolute pressure: The actual pressure (relative to absolute vacuum) Gage pressure: The difference between the absolute pressure and the local atmospheric pressure. Most pressure-measuring devices are calibrated to read zero in the atmosphere, and so they indicate gage pressure. Vacuum pressures: Pressures below atmospheric pressure. 28
29 THE BAROMETER AND ATMOSPHERIC PRESSURE Atmospheric pressure is measured by a device called a barometer; thus, the atmospheric pressure is often referred to as the barometric pressure. standard atmosphere: Pressure produced by a column of mercury 760 mm (= h) in height at 0 C ( Hg = 13,595 kg/m 3 ) under standard gravitational acceleration (g = m/s 2 ). Barometer 29
30 PROBLEM-SOLVING TECHNIQUE Step 1: Problem Statement Step 2: Schematic Step 3: Assumptions and Approximations Step 4: Physical Laws Step 5: Properties Step 6: Calculations Step 7: Reasoning, Verification, and Discussion 30
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