Thermodynamics Crash Course

Lesson 1 • Systems, Boundaries, and Surroundings

Defines open, closed, and isolated systems with boundary types. Anchors all subsequent energy analysis to correct system identification.

Lesson 2 • Processes and Thermodynamic Cycles

Introduces isothermal, isobaric, isochoric, and adiabatic processes. Cycle recognition is prerequisite to analysing heat engines and refrigeration systems.

Lesson 3 • Equations of State

Presents the ideal gas law and introduces real-gas corrections. Accurate property prediction underpins all subsequent energy and entropy calculations.

Lesson 4 • Thermodynamic Properties and State

Distinguishes intensive from extensive properties and defines thermodynamic state. Provides the property language used throughout all energy calculations.

Lesson 1 • Work Interactions and Boundary Work

Defines work sign convention and derives boundary work for common processes. Boundary work integrals are used directly in piston-cylinder and compressor problems.

Lesson 2 • Forms of Energy in Systems

Categorises kinetic, potential, and internal energy within a system. Correct energy accounting prevents errors in all first-law applications.

Lesson 3 • Heat Transfer Fundamentals

Covers conduction, convection, and radiation as heat transfer mechanisms. Distinguishes heat from work to prevent misapplication of energy balance equations.

Lesson 4 • Specific Heats and Calorimetry

Defines Cv and Cp and relates them through the ideal gas relation. Specific heat data enables internal energy and enthalpy changes without full property tables.

Lesson 1 • Compressed Liquid Approximation

Justifies using saturated liquid properties at the same temperature for compressed liquids. This approximation avoids compressed liquid tables when data is unavailable.

Lesson 2 • Phase Diagrams and Phase Change

Explains P-T and P-v diagrams, triple point, and critical point. Phase diagram literacy is required to identify substance state before reading property tables.

Lesson 3 • Saturated and Superheated States

Defines compressed liquid, saturated mixture, and superheated vapour regions. Correct region identification determines which property table or equation to use.

Lesson 4 • Mixture Properties and Quality

Calculates internal energy, enthalpy, and entropy of wet mixtures using quality. Mixture property equations bridge saturated liquid and vapour table values.

Lesson 1 • Energy Efficiency and Performance Metrics

Defines thermal efficiency, mechanical efficiency, and isentropic efficiency. These metrics benchmark real device performance against ideal thermodynamic limits.

Lesson 2 • Transient and Uniform-Flow Processes

Handles filling and emptying problems where system state changes with time. Uniform-flow assumption simplifies transient analysis to algebraic energy balances.

Lesson 3 • Steady-Flow Device Analysis

Applies the steady-flow equation to nozzles, diffusers, turbines, and compressors. Each device type has simplifying assumptions that reduce the general equation.

Lesson 4 • First Law for Open Systems

Extends energy balance to control volumes with mass flow. Steady-flow energy equation governs turbines, compressors, nozzles, and heat exchangers.

Lesson 1 • Second Law Statements

Presents Kelvin-Planck and Clausius statements and proves their equivalence. Both statements define impossible devices that violate the second law.

Lesson 2 • Carnot Cycle and Carnot Efficiency

Constructs the Carnot cycle from two isothermal and two adiabatic processes. Carnot efficiency sets the upper bound for any heat engine operating between two temperatures.

Lesson 3 • Reversible and Irreversible Processes

Identifies sources of irreversibility including friction, heat transfer, and mixing. Reversibility is the benchmark for maximum possible work output.

Lesson 4 • Thermal Reservoirs and Heat Engines

Defines thermal reservoirs and the heat engine operating between two reservoirs. Reservoir concept is the foundation for all second-law efficiency comparisons.

Lesson 1 • Isentropic Processes and Relations

Derives isentropic relations for ideal gases and applies them to turbines and compressors. Isentropic relations provide ideal outlet conditions for efficiency calculations.

Lesson 2 • Entropy as a Thermodynamic Property

Derives entropy from the Clausius inequality and establishes it as a state property. Entropy's state-function nature allows calculation along any convenient path.

Lesson 3 • Entropy Change of Pure Substances

Calculates entropy changes using property tables and T-ds relations for ideal gases. Accurate entropy change calculation is prerequisite to isentropic process analysis.

Lesson 4 • Entropy Balance for Open Systems

Extends entropy balance to steady-flow and transient control volumes. Open-system entropy balance identifies irreversibility in turbines, compressors, and mixers.

Lesson 1 • Brayton Cycle for Gas Turbines

Analyses the ideal and actual Brayton cycle for gas turbine power systems. Back-work ratio distinguishes gas turbines from steam cycles in performance analysis.

Lesson 2 • Rankine Cycle Analysis

Models the ideal Rankine cycle for steam power plants with four steady-flow devices. Rankine cycle efficiency and net work set the baseline for real plant performance.

Lesson 3 • Rankine Cycle Modifications

Covers reheat and regenerative Rankine cycles that improve thermal efficiency. Modifications reduce irreversibility and increase average heat addition temperature.

Lesson 4 • Vapour-Compression Refrigeration Cycle

Models the standard vapour-compression cycle with compressor, condenser, valve, and evaporator. COP calculation and refrigerant selection criteria are central outcomes.

Lesson 5 • Otto and Diesel Cycles

Analyses air-standard Otto and Diesel cycles as models for reciprocating engines. Compression ratio and cutoff ratio govern efficiency in each respective cycle.

Lesson 1 • Exergy Concept and Dead State

Defines exergy as maximum useful work relative to the dead state environment. Dead state selection determines the reference for all exergy calculations in a system.

Lesson 2 • Exergy Analysis of Power Cycles

Applies exergy balance to Rankine and Brayton cycle components to locate losses. Exergy destruction maps guide engineers toward the highest-impact design improvements.

Lesson 3 • Second-Law Efficiency

Defines second-law efficiency as actual performance divided by reversible performance. Second-law efficiency reveals how effectively a device uses its exergy input.

Lesson 4 • Exergy Balance for Systems

Formulates exergy balance relating exergy input, output, and destruction. Exergy destruction equals temperature times entropy generation by the Gouy-Stodola theorem.