ME 200 L24: Definition of Entropy & Entropy as a Property Kim See’s Office ME Gatewood Wing Room 2172 Please check your HW and Examination Grades on Blackboard.

Slides:

Advertisements

Similar presentations

ME 200 L39 Vapor Compression Cycle Read 10

Advertisements

ME 200 L36 Ground Transportation (Continued) (Air Standard Otto Cycle) 9.1 and 9.2 Kim See’s Office ME Gatewood Wing Room 2172 Examination and Quiz grades.

Second Law Analysis of Open Systems Isentropic Device Efficiency

ME 200 L38 CARNOT REFRIGERATION CYCLE Read 10.1 Material not picked up this week may be recycled! ME 200 L38 CARNOT REFRIGERATION CYCLE Read 10.1 Kim Sees.

\ ME 200 L34 Self Study Assignment 9.6 Todays Class 9.11 Material not picked up this week may be recycled! \ ME 200 L34 Gas Turbine Power Generation and.

EGR 334 Thermodynamics Chapter 6: Sections 9-10

ME 200 L19: ME 200 L19:Conservation Laws: Cycles HW 7 Due Wednesday before 4 pm HW 8 Posted Start early Kim See’s Office ME Gatewood Wing Room

Material not picked up this week may be recycled! ME 200 L37: Aircraft Propulsion Reading Assignment 9.11 Office ME Gatewood Wing Room 2172 Material not.

The First Law of Thermodynamics

Chapter 4 Mass and Energy Analysis of Control Volumes (Open Systems)

Lecture# 9 MASS AND ENERGY ANALYSIS OF CONTROL VOLUMES

Lec 13: Machines (except heat exchangers)

ME 200 L6: Energy Rate Balance, Transient Operation, Cyclic Repetitive Operation, Cycle Analysis, Efficiency & Coefficient of Performance Spring 2014.

Advanced Thermodynamics Note 4 The Second Law of Thermodynamics

Entropy Cengel & Boles, Chapter 6 ME 152.

Entropy Change Property diagrams (T-s and h-s diagrams) –From the definition of the entropy, it is known that  Q=TdS during a reversible process. –Hence.

CHAPTER 4 The First Law of Thermodynamics – Steady flow systems (steady means no change with time)

Instructors Visual Aids Heat, Work and Energy. A First Course in Thermodynamics © 2002, F. A. Kulacki Chapter 6 Module 1 Slide 1 The T-dS Equations ΔS.

Further Analysis of Reversible Machines P M V Subbarao Professor Mechanical Engineering Department Innovation of A New Property of A System!!!!

Shaft Power Cycles Ideal cycles Assumptions:

Lec 23: Brayton cycle regeneration, Rankine cycle

Entropy: A Measure of Disorder. 2 Entropy and the Clausius Inequality The second law of thermodynamics leads to the definition of a new property called.

EGR 334 Thermodynamics Chapter 6: Sections 11-13

Chapter 5 The First Law of Thermodynamics

Thermodynamics I Chapter 6 Entropy Mohsin Mohd Sies Fakulti Kejuruteraan Mekanikal, Universiti Teknologi Malaysia.

PTT 201/4 THERMODYNAMIC SEM 1 (2013/2014) CHAPTER 7: Entropy.

PTT 201/4 THERMODYNAMIC SEM 1 (2012/2013). Objectives Apply the second law of thermodynamics to processes. Define a new property called entropy to quantify.

ME 200 L13: Energy Applications: Stationary; Energy Applications: Transportation ME 200 L13: Energy Applications: Stationary; Energy Applications: Transportation.

ME 200 L14: ME 200 L14:Conservation of Mass: Control Volume HW 5 cancelled HW 6 assigned Spring 2014 MWF.

Chap. 3 (Sec. 3-5 to End of Chapter) Mass Flow Rate =  A V (kg/s) Volume Flow Rate = A V (m 3 /s) V = velocity.

ME 200 L3: Introduction to Thermodynamics ME 200 L3: Introduction to Thermodynamics Energy: Kinetic, Potential and Internal Spring 2014 MWF AM.

ME 200 L18: ME 200 L18:Conservation Laws: Heat Exchangers HW 7 Posted Due in One Week: Kim See’s Office ME Gatewood Wing Room

Calculating Entropy Change

The First Law of Thermodynamics

\ ME 200 L32 Today’s Class 8.3 Exams not picked up this week may be recycled! \ ME 200 L32 Utility Power Generation Self Study Assignment 8.2 Today’s Class.

ME 200 L31: Review for Examination 3 ME 200 L31: Review for Examination 3 Thu 4/10/14 Examination 3 (L22 – L30) 6:30 – 7:30 PM WTHR 200, CL50 224, PHY.

Lecture slides by Mehmet Kanoglu

ERT 206 THERMODYNAMICS WAN KHAIRUNNISA WAN RAMLI

Entropy Rate Balance for Closed Systems

ME 200 L35 Ground Transportation (Air Standard Otto Cycle) 9.1 and 9.2 Material not picked up this week may be recycled! ME 200 L35 Ground Transportation.

ME 200 L15: ME 200 L15:Conservation of Energy: Control Volumes 2.5, HW 5 cancelled; HW 6 assigned: Due 02/26/14

ME 200 L16: ME 200 L16:Transient & Steady State Processes Read ThermoMentor © Program Launched Spring 2014 MWF.

Entropy Change Property diagrams (T-s and h-s diagrams) from the definition of the entropy, it is known that Q=TdS during a reversible.

HIGH SPEED FLOW 1 st Semester 2007 Pawarej CHOMDEJ Jun-071.

ME 200 L27: Control Volume Entropy Balance ME 200 L27: Control Volume Entropy Balance Kim See’s Office ME Gatewood Wing Room 2172 Please check your HW.

Chapter 10 Vapor and Combined Power Cycles Study Guide in PowerPoint to accompany Thermodynamics: An Engineering Approach, 7th edition by Yunus.

ME 200 L23: Clausius Inequality and Control Volume Example Problems Kim See’s Office ME Gatewood Wing Room 2172 Please check your HW Grades on Blackboard.

Second Law of Thermodynamics Alternative Statements

Chapter 7 ENTROPY Dr. Kagan ERYURUK

1 Second Law of Thermodynamics - Entropy. 2 Introduction The second low often leads to expressions that involve inequalities.

CHAPTER 6 Entropy. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. The Clausius Inequality: This inequality.

5 Exergy Exergy and Anergy Evaluation of heat Quantity Quality 5.1 Introduction Full convertible energy: mechanical Partial convertible energy: heat Unconvertible.

Entropy (YAC- Ch. 6) Introduce the thermodynamic property called Entropy (S) Entropy is defined using the Clausius inequality Introduce the Increase of.

ME 200 L28: Control Mass Entropy Balance and Directionality of Processes ME 200 L28: Control Mass Entropy Balance and Directionality of Processes

Thermodynamics I. Examples  2.25  2.74  2.89 Wrap-up  Heat – work equivalent  Chapter 2 Equations  One-Minute Paper  Test 1: 1/27 Chapter 2 Text.

Dr. Owen Clarkin School of Mechanical & Manufacturing Engineering Summary of Energy Topics Chapter 1: Thermodynamics / Energy Introduction Chapter 2: Systems.

Dr. Owen Clarkin School of Mechanical & Manufacturing Engineering Summary of Energy Topics Chapter 1: Thermodynamics / Energy Introduction Chapter 2: Systems.

ME 200 L26: Entropy Change for an Ideal Gas Kim See’s Office ME Gatewood Wing Room 2172 Please check your HW and Examination Grades on Blackboard Please.

1 Chapter 5 Mass and Energy Analysis of Control Volumes.

Thermodynamic Property Relations

Chapter 14 Gas-Vapor Mixtures and Air-Conditioning Study Guide in PowerPoint to accompany Thermodynamics: An Engineering Approach, 8th edition.

ES 211: Thermodynamics Tutorial 5 & 6

Chapter 5 The First Law of Thermodynamics for Opened Systems

Chapter 7 Entropy: A Measure of Disorder

Chapter 5 Mass and Energy Analysis of Control Volumes Study Guide in PowerPoint to accompany Thermodynamics: An Engineering Approach, 6th edition.

Mass and Energy Analysis of Control Volumes (Open Systems)

Phase Transition Example

Chapter Four: Energy transfer by Heat, Work and Mass

Log Mean Temperature Difference (LMTD) is best suited when the temperature difference is known.

Internal Combustion Engineering Division

Presentation transcript:

ME 200 L24: Definition of Entropy & Entropy as a Property Kim See’s Office ME Gatewood Wing Room 2172 Please check your HW and Examination Grades on Blackboard Please pick up all graded Home Work ThermoMentor © Program Launched Spring 2014 MWF AM J. P. Gore Gatewood Wing 3166, Office Hours: MWF TAs: Robert Kapaku Dong Han

Entropy is a Property ►Entropy is easier to understand if thought of as a property analogous to specific volume. It is defined as:

Entropy Change Calculations Q H =1000 kJ, T H =500 K and Q C =600 kJ at T C : (a) 200 K, (b) 300 K, (c) 400 K. Find if each heat transfer is reversible find entropy change for (the material that makes up) the reservoir. Solution: Use the given Q H, Q C and T H, T C values to find the entropy change for the reservoirs:

Examples: Entropy Change for the Reservoirs (Property of materials making up the reservoirs) (a) Entropy can decrease and increase! Net entropy change can be zero! (b) (c) Net entropy change can be negative! However, can’t continue that process in a cyclic manner! Since by definition reservoir properties are fixed, these changes must be compensated by reverse actions!

Entropy Change using Tables 1 5 Given: Steam at 100 o C, 1 bar is pressurized through a diffuser to 1.5 bars, 120 o C and negligible velocity. Find: Find the change in entropy of steam in kJ/kg-K and comment on whether the diffuser can be adiabatic and the resulting impact. Assumptions: Change in PE neglected, No heat transfer, No work done other than flow work, Steady state, Steady flow, Mass is conserved. Adiabatic diffuser with given pressure gain leads to decrease in entropy. In reality, this diffuser design will not function!

6 State 1: 1bar, 100 C State 2: 1.5 bar, 120 C Saturated State: 1.5b bar, 111 C T-s Diagram and Diffuser Action (This diffuser will not work!) State 2: 1.5 bar, h2>h1, s2<S1 State 1: 1bar, 100 C

Entropy Change using Tables 2 7 Given: Consider R134 throttled from p3 =120 lbf/in 2 to p4 =40 lbf/in 2. Find: Find the change in entropy of R134. Assumptions: Change in KE, PE neglected, No heat transfer, No work done other than flow work, Steady state, Steady flow, Mass is conserved. Adiabatic throttle with a pressure loss and phase change lead to increase in Entropy while keeping Enthalpy constant.

8 State 4 State 3 T-s Diagram and Demonstration of Throttle Action; h-s diagram State 3 State 4