CHAPTER 7 ENTROPY. Copyright Hany A. Al-Ansary and S. I. Abdel-Khalik (2014) 1
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1 CHAPTER 7 ENTROPY S. I. Abdel-Khalik (2014) 1
2 ENTROPY The Clausius Inequality The Clausius inequality states that for for all cycles, reversible or irreversible, engines or refrigerators: For internally-reversible cycles: For Irreversible cycles: S. I. Abdel-Khalik (2014) 8
3 Implications of Clausius Inequality The cyclic integral of a quantity is zero only if that quantity is a property Example: Cyclic integral of volume Therefore, ( Q/T) int.rev must be an exact differential for a property S. I. Abdel-Khalik (2014) 9
4 Definition of Entropy The formal definition of the property with an exact differential ( Q/T) int.rev is: Entropy ( S ) is an Extensive property (kj/k) s Specific entropy = Entropy per unit mass (kj/kg-k) is an intensive property S. I. Abdel-Khalik (2014) 10
5 Entropy Change The equilibrium state of a simple system is completely specified by any two independent intensive properties (e.g. Temp. & Entropy) Can show processes on a T-s diagram Entropy change between two specified equilibrium states is the same whether the process is reversible or irreversible. S. I. Abdel-Khalik (2014) 11
6 Entropy Generation Consider a cycle consisting of two processes Process 1-2 can be reversible or irreversible Process 2-1 is internally reversible According to Clausius Inequality S. I. Abdel-Khalik (2014) 12
7 Entropy Generation Some entropy is generated or created during an irreversible process due to the presence of irreversibilities The entropy generated S gen is always zero For an internally-reversible process, S gen = 0 S. I. Abdel-Khalik (2014) 13
8 The Increase in Entropy Principle The system and its surroundings form an Isolated system, therefore: 0 Above relation is known as the increase in entropy principle S. I. Abdel-Khalik (2014) 14
9 The Increase in Entropy Principle All real processes must proceed in the direction that complies with the increase in entropy principle. A process that violates this principle is impossible. Entropy is a non-conserved property (i.e. no such thing as the conservation of entropy principle) The entropy change of a system can be negative, but the entropy generation cannot S. I. Abdel-Khalik (2014) 15
10 The Increase in Entropy Principle The performance of engineering systems is degraded by the presence of irreversibilities. Entropy generation is a measure of the magnitude of the irreversibilities during the process. Entropy generation is used to establish criteria for the performance of engineering systems. S. I. Abdel-Khalik (2014) 16
11 LECTURE # 18 Chapter 7 (Session #2): Entropy S. I. Abdel-Khalik (2014) 17
12 Entropy of a Pure Substance Entropy is a property; value of entropy of a system is fixed once the state of the system is fixed. The specific entropy of a pure substance (relative to a specified datum) is determined from the tables (like other properties). The unit of entropy is kj/k. The unit of specific entropy is kj/kg.k. S. I. Abdel-Khalik (2014) 18
13 PROPERTY TABLES Saturated Liquid and Saturated Vapor Known T sat [Tables A-4 (water); A-11 (R134a)] Known P sat [Tables A-5 (water); A-12 (R134a)] How to use for saturated Liquid-Vapor Mixture? Superheated Vapor Tables A-6 (water); A-13 (R134a) Compressed (subcooled) Liquid Table A-7 (water) S. I. Abdel-Khalik (2014) 19
14 PROPERTY TABLES -- Saturated Liquid & Saturated Vapor Table A-4 (Water) -- Examples: For T sat = 50 C: s f = kj/kg.k; s g = kj/kg.k; s fg = kj/kg.k For T sat = 100 C: s f = kj/kg.k; s g = kj/kg.k; s fg = kj/kg.k or T sat = C: s f = kj/kg.k; s g = kj/kg.k; s fg =0 kj/kg.k S. I. Abdel-Khalik (2014) 20
15 PROPERTY TABLES -- Saturated Liquid & Saturated Vapor Table A-5 (Water) -- Examples: For P sat = 75 kpa: s f = kj/kg.k; s g = kj/kg.k; s fg = kj/kg.k For P sat = 2.00 MPa: s f = kj/kg.k; s g = kj/kg.k; s fg = kj/kg.k For P sat = MPa: s f = kj/kg.k; s g = kj/kg.k; s fg =0 kj/kg.k S. I. Abdel-Khalik (2014) 21
16 PROPERTY TABLES -- Superheated vapor Example: Water (superheated vapor) at 200 C and 0.1 MPa Table A-6: v = m 3 /kg u = kj/kg h = kj/kg s = kj/kg K S. I. Abdel-Khalik (2014) 22
17 PROPERTY TABLES -- Compressed Liquid Example: Compressed Liquid Water at 200 C and 10 MPa Table A-7: v = m 3 /kg u = kj/kg h = kj/kg s = kj/kg K S. I. Abdel-Khalik (2014) 23
18 Isentropic Processes A process during which the entropy remains constant is called an isentropic process. An internally-reversible (i.e. frictionless) adiabatic process is automatically isentropic S. I. Abdel-Khalik (2014) 24
19 Isentropic Processes Closed System Undergoing Isentropic Expansion Isentropic Expansion in Steady- Flow Open System (Turbine) State 1 State 2 No Heat Transfer and No Friction S. I. Abdel-Khalik (2014) 25
20 Property Diagrams Involving Entropy For internally-reversible processes, the area under the process line on a T-S diagram represents the amount of heat transferred during the process. Reversible processes are shown as solid lines on the T-S diagram Irreversible processes are shown as dashed lines on the T-S diagram S. I. Abdel-Khalik (2014) 26
21 Understanding Entropy Entropy is a measure of the level of molecular disorder of a substance. The higher the level of disorder, the higher the entropy. Gases have higher molecular disorder they have higher entropy. The higher the level of disorder, the more disorganized energy becomes the less useful effect it can have. S. I. Abdel-Khalik (2014) 27
22 Understanding Entropy A pure crystalline substance at absolute zero temperature is in perfect order, and its entropy is zero. S. I. Abdel-Khalik (2014) 28
23 Understanding Entropy Work is an organized form of transferring energy. All molecules are moving in the same direction. Work does not involve entropy. EXAMPLE Raising a weight by a rotating shaft does not create any disorder (entropy) Energy is not degraded during this process. S. I. Abdel-Khalik (2014) 29
24 Understanding Entropy The paddle-wheel work done on a gas increases the level of disorder (entropy) of the gas. Energy is degraded during this process. Converting work into heat degrades energy FRICTION: dissipation of energy that otherwise could do work into a heating effect S. I. Abdel-Khalik (2014) 30
25 Understanding Entropy During a heat transfer process between a hot and a cold body, the entropy of the hot body decreases, while the entropy of the cold body increases. Net entropy increases (according to the Increase of Entropy Principle). Heat transfer across a finite temperature difference always involves generation of entropy, and degrades energy. S. I. Abdel-Khalik (2014) 31
26 The T- ds Relations Applying the first law of thermodynamics to a system undergoing an internally-reversible process: Therefore, This is called the First T ds Equation or Gibbs Equation S. I. Abdel-Khalik (2014) 32
27 The T- ds Relations By applying the definition of enthalpy (h = u + Pv) on the first T ds equation, we get: This is called the Second T ds equation S. I. Abdel-Khalik (2014) 33
28 The T- ds Relations Dividing the two T- ds equations by T, we get: Above relations can be used to determine changes in entropy S. I. Abdel-Khalik (2014) 34
29 Entropy Change for Liquids and Solids Liquids and solids can be approximated as incompressible substances since their specific volumes remain nearly constant during a process, i.e. dv 0 0 As shown earlier, for liquids and solids: c p = c v = c AND du = c dt S. I. Abdel-Khalik (2014) 35
30 Entropy Change of Ideal Gases From the first T ds relation: Also, for ideal gases: and Therefore, S. I. Abdel-Khalik (2014) 36
31 Entropy Change of Ideal Gases From The second T ds relation: Also, for ideal gases: and Therefore, S. I. Abdel-Khalik (2014) 37
32 Constant Specific Heat (Approximate Analysis) Under the constant-specific-heat assumption, the specific heat is assumed to be constant and equal to some average value. In this case: S. I. Abdel-Khalik (2014) 38
33 Constant Specific Heat (Exact Analysis) We choose absolute zero as the reference temperature and define a function s as The entropy of an ideal gas depends on both T and P. The function s 0 represents only the temperaturedependent part of entropy. S. I. Abdel-Khalik (2014) 39
34 Isentropic Process of Ideal Gases (Approximate Analysis) = zero Therefore, For an ideal gas: & Therefore, Similarly, and S. I. Abdel-Khalik (2014) 40
35 Isentropic Process of Ideal Gases (Exact Analysis) exp(s /R) is called the relative pressure P r It is listed in Table A-17 for air 41
36 Isentropic Process of Ideal Gases (Exact Analysis) T/P r is called the relative specific volume v r It is listed in Table A-17 for air 42
37 Reversible Steady Flow Work For a reversible steady flow process, the First Law can be written as: We also know that: When Δke & Δpe are negligible S. I. Abdel-Khalik (2014) 43
38 Remarks on Reversible Steady Flow Work The larger the specific volume, the greater the work produced (or consumed) by a steady-flow device. It can be shown that work-producing devices (e.g. turbines) deliver more work when they operate reversibly. It can also be shown that work-consuming devices (e.g. compressors) require less work when they operate reversibly. S. I. Abdel-Khalik (2014) 44
39 Reversible versus Irreversible Steady Flow Work Heat input and work output are positive Actual Reversible Since end states are the same: Since and Work-producing devices such as turbines deliver more work, and work-consuming devices such as pumps and compressors require less work when they operate reversibly. S. I. Abdel-Khalik (2014) 45
40 Remarks on Reversible Steady Flow Work If an adiabatic steady flow device (e.g. turbine, compressor, etc.) involves no irreversibilities: The process becomes isentropic. The device will produce (or consume) reversible work 0 (adiabatic) 0 (internally reversible) In this case, reversible work can be used as a reference for the performance of the equivalent real devices. The comparison is made through a quantity called isentropic efficiency. S. I. Abdel-Khalik (2014) 46
41 Isentropic Efficiencies of Adiabatic Turbines (Negligible Δke & Δpe) S. I. Abdel-Khalik (2014) 47
42 Isentropic Efficiencies of Adiabatic Pumps and Compressors (Negligible Δke & Δpe) For a pump, quantifying reversible (isentropic) work is simple: Since v is nearly constant: S. I. Abdel-Khalik (2014) 48
43 Isentropic Efficiency of Adiabatic Nozzles The purpose of the nozzle is to increase the KE of the fluid If the inlet velocity of the fluid is small compared to the exit velocity, the First Law yields: Therefore, S. I. Abdel-Khalik (2014) 49
44 Entropy Balance Entropy change of a system: S. I. Abdel-Khalik (2014) 50
45 Mechanisms of Entropy Transfer, S in and S out 1. Entropy Transfer by Heat Transfer Heat transfer is always accompanied by entropy transfer in the amount of Q/T, where T is the boundary temp. S. I. Abdel-Khalik (2014) 51
46 Mechanisms of Entropy Transfer, S in and S out 2. Entropy Transfer by Work No entropy accompanies work as it crosses the system boundary. But entropy may be generated within the system as work is dissipated into a less useful form of energy (a heating effect by friction) S. I. Abdel-Khalik (2014) 52
47 Mechanisms of Entropy Transfer, S in and S out 2. Entropy Transfer by Mass Mass contains entropy as well as energy, and thus mass flow into or out of a system is always accompanied by energy and entropy transfer S. I. Abdel-Khalik (2014) 53
48 Closed Systems The entropy change of a closed system during a process equals the sum of the net entropy transferred through the system boundary by heat transfer and the entropy generated within the system boundaries. S. I. Abdel-Khalik (2014) 54
49 Control Volumes The entropy of a control volume changes as a result of mass flow as well as heat transfer S. I. Abdel-Khalik (2014) 55
50 Control Volumes The entropy of a substance always increases (or remains constant in the case of a reversible process) as it flows through a single stream adiabatic, steady-flow device S. I. Abdel-Khalik (2014) 56
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