Engineering Thermodynamics System Study Guide
This guide follows a logical framework of "basic concepts - core laws - thermodynamic properties - cycle analysis - application expansion," systematically decomposing the core knowledge modules of engineering thermodynamics. By connecting article titles to link the knowledge points, it clearly outlines the complete path from basic theory to engineering application, helping learners establish a solid theoretical framework in engineering thermodynamics and mastering the analysis methods for thermodynamic systems, thermodynamic properties, and cycle processes, thereby enhancing their ability to analyze and optimize thermodynamic devices and systems.
Basic Concepts - 6
Engineering Thermodynamics Basic Concepts (Thermodynamic System, State Parameters, Processes and Cycles)
- Disciplinary Position and Core Research Tasks of Engineering Thermodynamics
- Engineering Thermodynamics and the Significance of the Relationship Between Industrial Production and Energy Utilization
- The Definition and Engineering Selection Principles of Working Fluids (Flowability, Stable Thermal Properties, etc.)
- Common types of engineering fluids (gas, steam, humid air, etc.)
- Definition and Criteria for Division of Thermodynamic Systems (Boundary and Surroundings)
- Standards for defining closed and open systems with examples
- Definition of isolated system and adiabatic system and their thermodynamic properties
- Definition and Classification of State Parameters (Intensity Parameters, Extensive Parameters)
- The Physical Meaning of Core State Parameters (Temperature, Pressure, Specific Volume, Internal Energy, Enthalpy, Entropy)
- Definition and the conditions under which the process is realized (isothermal process, reversible process)
- The Essential Difference Between Reversible and Irreversible Processes
- Definition and Engineering Purpose of Thermodynamic Cycle (Energy Conversion)
- Distinguishing between positive and negative cycles (power cycle, refrigeration/heat pump cycle)
- Initial Understanding of Circular Economy Evaluation Indicators
Core Law
First Law of Thermodynamics (Energy Conservation and Conversion, Energy Equations for Closed/Open Systems)
- The Essence of the First Law of Thermodynamics (Energy Conservation and Conversion Law)
- Textual Expression of the First Law of Thermodynamics and Its Universal Applicability
- Definition of heat and work, units, and thermodynamic symbols
- Method for Calculating Volumetric Work and the Expression for Work in a Quasi-Static Process
- Closed system first law of thermodynamics energy equation derivation
- Applications and Calculation Steps of the Closed System Energy Equation
- Energy Balance Analysis of an Open System (Combined with Mass and Energy Conservation)
- Derivation and Simplification of the Energy Equation for a Steady Flow in an Open System
- Background of the introduction of enthalpy and the enthalpy expression form of the steady-flow energy equation
- Energy equation of open systems applied in thermal devices (boilers, turbines)
- First Law of Thermodynamics: Foundation in Energy Conversion Efficiency Analysis
Second Law of Thermodynamics (Entropy Principle, Carnot Cycle and Carnot Theorem, Availability Analysis)
- Research Objectives of the Second Law of Thermodynamics (Directionality and Limits of Energy Conversion)
- Classical formulation (Clausius statement, Kelvin-Planck statement)
- Equivalence Proof Approach for Two Expressions
- Construction process of the Carnot cycle (comprising four reversible processes)
- Calculation of Thermal Efficiency of the Carnot Cycle and Influencing Factors
- The content and physical significance of the Carnot theorem (maximum thermal efficiency of a reversible cycle)
- Carnot's theorem's significance for optimizing actual cycles
- Definition of Entropy and the Method of Calculation of Entropy Change
- Expression of the Second Law of Thermodynamics and Criteria for Irreversible Processes in Isolated Systems
- Application of the Second Law of Thermodynamics in Engineering Thermodynamics
- Exergy (availability) definition and energy quality characterization
- Calculation Methods for Thermal Exergy and Technical Work Exergy
- Exergy Loss: Causes and Computational Analysis
- Exergy-based energy utilization optimization approach
Properties of a Working Fluid
Thermodynamic properties of pure substances (p-v-T relations, phase diagrams, saturation states, and critical states)
- Research significance of thermodynamic properties of pure substances (state description and process calculation of working fluids)
- Phase changes (solid, liquid, gas) of pure substances and the conditions for phase transitions
- Physical significance and expression forms of P-V-T relationships (equations, charts)
- Structure and Interpretation Methods of Pure Substance's p-v and T-s Diagrams
- Definition of the saturated state (saturation liquid, saturation vapor, wet steam)
- Correspondence between Saturation Temperature and Saturation Pressure
- Definition and Calculation of the Dryness Fraction of Wet Steam
- Definition of critical state and critical parameters (critical temperature, pressure, specific volume)
- Interpretation of the P-T diagram of pure substances and the significance of the triple point
- Methods of Retrieval and Engineering Applications of Thermodynamic Property Tables for Pure Substances
Ideal Gas and Real Gas (Ideal Gas Equation, Gas Constant, Compressibility Factor)
- Definition of an ideal gas with the molecular assumptions (molecules have no volume, no intermolecular forces)
- Derivation and Expression of the Ideal Gas Law (pν = RT)
- Difference between the universal gas constant and the gas constant, and conversion
- Properties of Ideal Gas Internal Energy and Enthalpy (Only Related to Temperature)
- Definition and Calculation of Specific Heat Capacity (Constant Pressure, Constant Volume)
- Conditions for the Applicability of Ideal Gases (Low Pressure, High Temperature)
- Causes of Deviations Between Actual and Ideal Gases
- Definition of the Compressibility Factor and Correction of the Real Gas State Equation
- Development Concept of the Van der Waals Equation and Its Application to Real Gases
- Law of Corresponding States and Application of the Universal Compressibility Factor Diagram in Real Gases
- Classification and Handling of Ideal and Real Gases in Engineering
Gas Mixtures and Humid Air (Component Calculation, Humidity Parameters, Processes of Humid Air)
- Definition of Gas Mixtures and Common Types in Engineering
- Method of Representing Components of Gas Mixtures (Mass Fraction, Mole Fraction)
- Application of Dalton's Law of Partial Pressures and the Partition Volume Law
- Combined Gas Constant and Specific Heat Capacity Calculation for Gas Mixtures
- Definition of moist air (mixture of dry air and water vapor)
- Basic Humidity Parameters of Moist Air (Specific Humidity, Relative Humidity, Dew Point Temperature)
- Psychrometric Chart Construction and Interpretation of Wet Air (h-d Chart)
- Method of Retrieval of h-d Diagrams (Given Known Parameters to Determine Unknown Parameters)
- Typical Process of Moist Air (Heating, Cooling, Humidification, Dehumidification)
- Thermodynamic Analysis of Moist Air Processes and Parameter Calculation
- Application of Moist Air in Air Conditioning and Drying Engineering
Cycle Analysis
Thermodynamic Process Analysis (Constant Pressure, Constant Volume, Constant Temperature, Adiabatic Process Parameter Calculation)
- The Core Purpose of Thermodynamic Process Analysis (Parameter Changes, Energy Conversion Calculations)
- Definition of Constant Volume Process and Process Equations
- Calculation of Work, Heat, and Internal Energy Changes in a Constant Volume Process
- Definition and Process Equations of the Constant Pressure Process
- Calculation of Work, Heat, and Enthalpy Changes in a Constant Pressure Process
- Definition and characteristics of the ideal gas isothermal process
- Work and Heat Calculation for an Ideal Gas in an Isothermal Process
- Definition and process equations of adiabatic process (ideal gas reversible adiabatic process)
- Entropy Variation Characteristics of Adiabatic Processes and Adiabatic Index
- Changes in Parameters and Energy Calculation for an Adiabatic Process of an Ideal Gas
- Definition and Process Equations of Variable Processes (Covering Typical Processes)
- Heat, Work Calculation, and Process Curve Plotting for Polytropic Processes
Steam Power Cycle (Rankine Cycle, Reheat Cycle, Regenerative Cycle Optimization)
- The core purpose of the steam power cycle (conversion of heat energy into mechanical energy)
- Rankine cycle processes (constant pressure heating, isentropic expansion, constant pressure heat rejection, isentropic compression)
- Drawing T-s Diagrams for the Rankine Cycle and Thermal Efficiency Calculation
- Factors Affecting the Thermal Efficiency of the Rankine Cycle (Steam Parameters, Back Pressure)
- The Design Concept for the Reheat Cycle (Solving the Wet Steam Problem)
- Analysis of thermal efficiency in reheat cycles and optimization effects
- Construction approach for a recuperative cycle (utilizing waste heat to heat the feedwater)
- Regenerative cycle's thermal efficiency calculation and economic efficiency improvement
- Actual Irreversible Factors in Steam Power Cycles and Efficiency Corrections
- Direction of Cycle Optimization in Modern Steam Power Plants
Refrigeration Cycle (Vapor-compression Refrigeration Cycle, Absorption Refrigeration Cycle)
- The core purpose of the refrigeration cycle (absorbing heat from a low-temperature heat source and discharging it to a high-temperature heat source)
- Coefficient of Performance for Refrigeration and Heat Pumps: Definition and Calculation
- Vapor-compression refrigeration cycle components (isothermal compression, constant pressure heat rejection, throttling expansion, constant pressure heat absorption)
- T-s diagram, p-h diagram drawing and parameter calculation for vapor-compression refrigeration cycles
- Selection Requirements and Common Types of Refrigerants
- Factors of Irreversible Loss in Actual Vapor Compression Refrigeration Cycles (Throttling Loss, Compression Loss)
- Absorption Refrigeration Cycle Principle (Heat-Driven)
- Components of an Absorption Refrigeration Cycle and Energy Conversion Process
- Comparison of Applicable Scenarios for Vapor-Compression and Absorption Refrigeration Cycles
- Energy-Efficient Optimization of a Refrigeration Cycle
Gas Turbine Cycle (Otto Cycle, Diesel Cycle, Brayton Cycle)
- Features of a gas dynamics cycle (with gas as the working substance and work done by volume change)
- Otto cycle components (constant volume heating cycle)
- Otto Cycle's p-v Diagram, T-s Diagram, and Thermal Efficiency Calculation
- Effect of Compression Ratio on Otto Cycle Thermal Efficiency
- Diesel Cycle Composition Process (Constant Pressure Heating Cycle)
- Thermal efficiency calculation of the Diesel cycle and the influence of compression ratio and pre-expansion ratio
- Otto cycle and Diesel cycle's applicable engine types comparison
- Brayton cycle components (constant pressure heating gas turbine cycle)
- Thermal Efficiency Calculation of the Brayton Cycle and Its Influence on Compressor Pressure Ratio
- Optimization Approach and Efficiency Enhancement for Brayton Cycle with Heat Recovery
- Gas Dynamic Cycle's Actual Irreversible Factors and Efficiency Correction
Application Extension
Thermal Analysis of Chemical and New Energy Equipment (Fuel Cells, Biomass Energy Utilization)
- Engineering Thermodynamics: Core Applications in Chemical Plants (Energy Balance and Optimization)
- Thermodynamic Analysis of Chemical Reaction Processes (Reaction Heat, Gibbs Free Energy)
- Thermodynamic calculations for distillation and drying in chemical engineering
- Fuel Cell Principle (Chemical Energy to Electric Energy)
- Thermodynamic Cycle Analysis and Efficiency Calculation of Fuel Cells
- Thermal Characteristics of Different Types of Fuel Cells (Proton Exchange Membrane, Solid Oxide)
- Utilization forms of biomass energy (combustion, gasification, liquefaction)
- Thermodynamic Analysis of a Power Cycle in Biomass Combustion
- Evaluation Metrics for Energy Conversion Efficiency of New Energy Devices
- Thermal Optimization Direction in the Chemical Industry and New Energy Devices
Efficiency Calculation and Energy-Saving Analysis of Thermal Equipment
- Common thermal equipment types (boiler, turbine, compressor, heat exchanger)
- The working principle and thermal efficiency calculation methods of a boiler
- Calculation of Relative Internal Efficiency and Isentropic Efficiency for Turbines
- Adiabatic efficiency, isothermal efficiency calculation, and energy-saving measures for compressors
- Analysis of Thermal Processes in Heat Exchangers and Thermal Efficiency Calculation
- Analysis of Irreversible Losses in Thermal Equipment (Exergy Loss)
- Core ideas for energy saving in heat systems: reducing exergy loss and recycling residual heat
- Thermodynamic Analysis and Economic Evaluation of Heat Recovery Systems
- Industrial Thermal Systems Overall Energy Optimization Method
- The Practical Significance of Engineering Thermodynamics in Energy Conservation and Emission Reduction