Design and Analysis of Thermal Systems

Cover
Half Title
Title Page
Copyright Page
Contents
Authors
Chapter 1: Introduction
1.1. Definition and Importance
1.1.1. Design versus Analysis
1.1.2. Synthesis for Design
1.1.3. Selection versus Design
1.2. Thermal System Design Aspects
1.2.1. Environmental Aspects
1.2.2. Safety Issues
1.3. Reliability, Availability and Maintainability (RAM)
1.4. Background Information and Data Sources
1.5. Workable, Optimal and Nearly Optimal Designs
1.6. Stages of the Design Process
1.6.1. DFX Strategies
1.6.2. Formulation of the Design Problem
1.6.2.1. Requirements
1.6.2.2. Given Parameters
1.6.2.3. Design Variables
1.6.2.4. Constraints and Limitations
1.6.2.5. Safety, Environmental and Other Considerations
1.7. Conceptual Designs
1.7.1. Modification in the Design of Existing Systems
1.7.2. Steps in the Design Process
1.7.2.1. Physical Systems
1.7.2.2. Modeling
1.7.2.3. Simulations
1.7.2.4. Acceptable Design Evaluations
1.7.2.5. Optimal Designs
1.7.2.6. Safety Features, Automation and Control
1.7.2.7. Communicating the Design
1.7.3. Computer-Aided Designs
Problems
Chapter 2: Modeling and Simulation Basics
2.1. Introduction
2.2. Types of Models
2.2.1. Analog Models
2.2.2. Mathematical Models
2.2.3. Physical Models
2.2.4. Numerical Models
2.3. Mathematical Modeling
2.3.1. Transient/Steady State
2.3.1.1. Case 1: τc→∞ (Large τc)
2.3.1.2. Case 2: τc << τr
2.3.1.3. Case 3: τc >> τr
2.3.1.4. Case 4: Periodic Processes
2.3.1.5. Case 5: Transient
2.3.2. Number of Spatial Dimensions
2.3.3. Lumped Mass Approximation
2.3.4. Simplification of Boundary Conditions
2.3.5. Negligible Effects
2.3.6. Idealizations
2.3.7. Material Properties
2.4. Sample Mathematical Modeling Examples
2.4.1. Storage Tank of Solar Collector
2.4.1.1. Lumped Mass Approximation
2.4.1.2. Material Properties
2.4.1.3. Spatial Dimensions
2.4.1.4. Simplifications
2.4.1.5. Governing Equation
2.4.1.6. Dimensionless Parameters
2.4.1.7. Dimensionless Initial/Boundary Conditions
2.4.2. An Electric Heat Treatment Furnace
2.4.2.1. Initial and Boundary Conditions
2.5. Dimensional Analysis
2.5.1. Example of an Electronic Device
2.5.1.1. Non-Dimensionalization
2.6. Curve Fitting
2.6.1. Least Square Method
2.6.2. Two Independent Variable Cases
2.6.2.1. Curve-Fitting Procedure
2.7. Numerical Modeling
2.7.1. Accuracy and Validation
2.8. Importance of Simulation
2.9. Different Classes of Numerical Simulation
2.9.1. Dynamic or Steady State
2.9.2. Continuous or Discrete
2.9.3. Deterministic or Stochastic
2.10. Flow of Information
2.11. Block Representation
2.11.1. Information Flow Diagram
2.12. Initial Design
2.13. Iterative Redesign for Convergence
2.14. Sample Thermal System Design Examples
2.14.1. A Piping Network Problem
2.14.2. A Gas Turbine Problem
2.14.3. Fin Design
2.14.3.1. Multiple Fins
2.14.3.2. An Example of a Fin Problem
Problems
References
Chapter 3: Exergy for Design
3.1. Introduction
3.1.1. Definition of Exergy
3.1.2. Environment
3.1.3. Exergy Components
3.1.3.1. Physical Exergy
3.1.3.2. Dead States
3.1.3.3. Chemical Exergy
3.2. Exergy Balance Equation
3.2.1. Closed System
3.2.1.1. Energy Balance of the Closed System
3.2.1.2. Entropy Balance of the Closed System
3.2.2. Open System
3.2.2.1. Exergy Transfers at Inlets and Outlets
3.2.3. Standard Chemical Exergy of Gases and Gas Mixtures
3.2.4. Standard Chemical Exergy of Fuels
3.3. Exergy Destruction and Exergy Loss
3.3.1. Exergy Destruction through Heat Transfer and Friction
3.3.1.1. Thermodynamic Average Temperature
3.3.1.2. Overview
3.3.2. Exergy Destruction and Exergy Loss Ratios
3.3.3. Exergetic Efficiency
3.3.3.1. How Do We Distinguish between Fuel and Product?
3.3.3.2. Compressor, Pump or Fan
3.3.3.3. Turbine or Expander
3.3.3.4. Heat Exchanger
3.3.3.5. Case 1
3.3.3.6. Case 2
3.3.3.7. Mixing Unit
3.3.3.8. Gasifier or Combustion Chamber
3.3.3.9. Boiler
3.3.3.10. Guidelines for Defining Exergetic Efficiency
3.3.3.11. Subsystem A
3.3.3.12. Subsystem B
3.4. Exergy Analysis of a Gas Turbine-Based Power Plant
3.4.1. Guidelines for Evaluating and Improving Thermodynamic Effectiveness
3.4.2. Additional Guidelines
3.5. Exergy Analysis of a Heat Exchanger
3.5.1. Area Constraint
3.5.2. Volume Constraint
3.5.3. Combined Area and Volume Constraint
3.5.4. Unbalanced Heat Exchanger
3.5.5. Counter-Flow Heat Exchanger
3.5.6. Parallel Flow Heat Exchanger
3.6. Exergy Analysis of a Refrigeration System
3.7. Exergy Storage System
3.8. Solar Air Collector
3.8.1. Heat Transfer Coefficient
3.8.2. Air Mass Flow Rate
3.8.2.1. Energy and Exergy Efficiency
3.8.2.2. Parametric Study
3.9. Ocean Thermal Energy Conversion
3.9.1. Hydrogen Production Using OTEC
3.9.1.1. Energy Analysis
3.9.1.2. Flat Plate Solar Collector
3.9.1.3. Organic Rankine Cycle
3.9.1.4. PEM Electrolyzer
3.9.1.5. Energy Efficiency
3.9.1.6. Exergy Efficiency
3.9.2. Simulation Results
Problems
References
Chapter 4: Material Selection
4.1. Material Properties
4.2. Software
4.3. Material Attributes
4.4. Selection Strategies
4.4.1. Material Indices
4.5. Case Studies
4.5.1. Case 1: Heat Sink Material
4.5.2. Case 2: Material for Sensible Thermal Energy Storage
4.5.3. Case 3: Phase Change Material for Cold Thermal Energy Storage
4.5.3.1. Thermophysical Properties
4.5.3.2. Kinetic Properties
4.5.3.3. Chemical Properties
4.5.3.4. Economics
4.5.4. Case 4: Selection of Insulation Material
4.5.5. Case 5: Heat Transfer Fluids for Solar Power Systems
4.6. Summary
Problems
References
Chapter 5: Heat Exchangers
5.1. Introduction
5.2. Classification of Heat Exchanger
5.3. Overall Heat Transfer Coefficient
5.4. Log Mean Temperature Difference (LMTD)
5.5. The ε–NTU Method
5.6. Variable Overall Heat Transfer Coefficient
5.7. Heat Exchanger Thermal Design
5.7.1. Rating Problem
5.7.2. Sizing Problem
5.8. Forced Convection Correlation for Single–Phase Side of a Heat Exchanger
5.9. Effect of Variable Properties
5.9.1. For Liquids
5.9.2. For Gases
5.10. Flow in Smooth Straight Non-Circular Ducts
5.11. Heat Transfer from Smooth Tube Bundles
5.12. Pressure Drop in Tube Bundles in Cross-Flow
5.13. Shell and Tube Heat Exchangers
5.14. Tube Passes
5.15. Tube Layout
5.16. Baffle Type
5.17. Tube-Side Pressure Drop
5.18. Bell–Delaware Method
5.18.1. Shell-Side Heat Transfer Coefficient
5.18.2. Shell-Side Pressure Drop
5.19. Kern Method
5.19.1. Shell-Side Heat Transfer Coefficient
5.19.2. Shell-Side Pressure Drop
5.20. Basic Design Process
5.21. Preliminary Design Estimation
5.22. Compact Heat Exchanger Design
5.22.1. Heat Transfer and Pressure Drop
5.22.2. Pressure Drop for Finned-Tube Exchangers
5.22.3. Pressure Drop for Plate-Fin Exchangers
5.23. Optimization of Heat Exchangers
Problems
References
Chapter 6: Piping Flow
6.1. Introduction
6.2. Energy Equations
6.2.1. Minor Losses
6.2.2. Graphics Symbol Conventions
6.2.3. General Considerations
6.2.4. Resistance Analogy
6.2.5. Classification of Pumps
6.2.6. Pump Selection
6.3. Pump Performance Using Dimensional Analysis
6.3.1. Dimensional Analysis
6.3.2. Specific Speed
6.4. Pump Curve for Viscous Fluid
6.4.1. Procedure to Obtain the Correction Factor and Pump Curve for Viscous Fluid
6.5. Effective Pump Performance Curve
6.5.1. Computer Implementation
6.5.1.1. Pumps in Series
6.5.1.2. Pumps in Parallel
6.6. System Characteristics
6.7. Pump Placement
6.7.1. Cavitation
6.7.2. Net Positive Suction Head
6.7.3. Recirculation Problem
6.8. Suction-Specific Speed
6.9. Net Positive Suction Head Available
6.10. Uncertainty Effect on Pump Selection
6.11. Uncertainty Analysis Procedure
6.11.1. Piping Network Design
6.12. Piping System Design
6.12.1. Hardy Cross Method
6.12.2. Hazen–Williams Coefficient
6.12.3. Basic Idea
6.12.4. Correction Factor
6.12.5. Implementation Procedure
6.13. Generalized Hardy Cross Analysis
6.13.1. Block Diagram
Problems
References
Chapter 7: Artificial Intelligence for Thermal Systems
7.1. Introduction
7.2. Expert System
7.2.1. Advantages of Expert Systems
7.2.2. Disadvantages of Expert Systems
7.2.3. Structure of Expert Systems
7.2.4. An Example for Feed Water Pump Selection
7.3. Artificial Neural Network (ANN) Overview
7.3.1. Structure of ANNs
7.3.2. Training of ANNs
7.4. ANNs for Heat Exchanger Analysis
7.5. ANNs for a Thermophysical Property Database
7.6. Physics Informed ANNs
7.7. ANNs for Dynamic Thermal Systems
7.8. Summary
References
Chapter 8: Numerical Linear Algebra
8.1. Bisection Method
8.1.1. Convergence of Bisection Method
8.2. Newton–Raphson Method
8.3. Eigenvalues and Eigenvectors
8.4. Power Iterations
8.5. Convergence
8.6. Inverse Power Iterations
8.7. Curve Fitting
8.8. Fitting of a Straight Line
8.9. Fitting of a Polynomial
8.10. Error Estimation
8.11. Solution of Algebraic Equations
8.12. Gaussian Elimination
8.12.1. Forward Elimination
8.12.2. Back Substitution
8.12.3. How to Improve the Solution
8.13. Jacobi and Gauss–Seidel Iterations
8.13.1. Vector and Matrix Norms
8.13.2. Convergence of the Jacobi Iteration
8.13.3. Gauss–Seidel Iteration
8.14. Extension to Nonlinear Systems
Chapter 9: Ordinary Differential Equations
9.1. Introduction
9.2. Euler Method
9.3. Runge–Kutta Method
9.4. Higher-Order IVP
9.5. Boundary Value Problems: Shooting Method
9.6. Boundary Value Problems: Finite Difference Method
Chapter 10: Numerical Differentiation and Integration
10.1. Introduction
10.2. Numerical Differentiation
10.3. Nonuniform Grid
10.4. Double Derivative
10.5. Numerical Integration: Newton–Cotes Formulas
10.5.1. Trapezoidal Rule
10.5.2. Simpson’s One-Third Rule
Chapter 11: Partial Differential Equations
11.1. Introduction
11.2. Classification
11.2.1. Marching Problem
11.2.2. Equilibrium Problem
11.2.3. Eigenvalue Problem
11.3. Second-Order Linear PDE
11.3.1. Parabolic Problem
11.3.2. Hyperbolic Problem
11.3.3. Elliptic Problem
11.4. One-Dimensional Transient Diffusion
11.5. Numerical Schemes
11.5.1. Explicit Scheme
11.5.2. Implicit Scheme
11.5.3. Crank–Nicolson Scheme
11.6. Stability and Consistency
11.6.1. Round-Off Error
11.6.2. Truncation Error
11.6.3. Consistency
11.6.4. Stability
11.7. Two-Dimensional Transient Diffusion
11.7.1. Explicit Scheme
11.7.2. Implicit and Crank–Nicolson Schemes
11.8. Elliptic Equations
11.8.1. Discretization
11.8.2. Solution Procedure
11.8.3. Pseudo-Transient Approach
Chapter 12: Computational Fluid Dynamics
12.1. Introduction
12.1.1. Non-Dimensionalization
12.2. Stream Function, Vorticity (ψ – ω) Formulation
12.2.1. Stream Function
12.2.2. Vorticity
12.2.3. Vorticity Transport Equation
12.2.4. Solution Strategy
12.3. Primitive Variable Formulation
Chapter 13: Electrochemical Systems
13.1. Introduction
13.1.1. Fuel Cells
13.1.2. Batteries and Fuel Cells
13.2. Fuel Cell Thermodynamics
13.2.1. Reversible Voltage
13.2.2. Reversible Efficiency
13.3. Classifications
13.3.1. PEMFC
13.3.2. SOFC
13.4. Losses in Fuel Cells
References
Chapter 14: Inverse Problems
14.1. Introduction
14.2. Inverse Heat Conduction: Conjugate-Gradient Approach
14.2.1. Sensitivity Problem
14.2.2. Adjoint Problem
14.2.3. Descent Direction and Step Size
14.3. Regularization and Stopping Criterion
14.3.1. Discrepancy Principle
14.3.2. Additional Measurement Approach
14.3.3. Smoothing of Experimental Data
14.4. Complete Algorithm
References
Appendix A: Thermophysical Properties (Working Fluids)
Appendix B: Thermophysical Properties (Exergy Calculation)
Appendix C: Thermophysical Properties (Emissivity)
Appendix D: Standard Pipe Dimension
Appendix E: Pump Performance Curve
Appendix F: Minor Loss Coefficient
Appendix G: Sample Project Topics
Index