Engineering Thermodynamics

Engineering thermodynamics studies energy, matter, and entropy at the scale of devices: engines, turbines, compressors, pumps, nozzles, boilers, condensers, heat exchangers, refrigerators, air conditioners, reacting flows, and high-speed gas systems. These notes follow the scope of Cengel, Boles, and Kanoglu's Thermodynamics: An Engineering Approach, 9th edition, with emphasis on the modeling sequence used in engineering work: choose the system, identify the state, select properties, write balances, simplify only with stated assumptions, and check the answer physically.

The section begins with the vocabulary of systems, properties, equilibrium, units, temperature, and pressure, then builds the first law for closed systems and control volumes. The second law introduces heat-engine limits, entropy generation, and exergy destruction. Later pages apply those principles to gas and vapor power cycles, refrigeration, real-fluid property relations, mixtures, psychrometrics, combustion, chemical equilibrium, and compressible flow. Property-table workflow is included as a separate page because table lookup and interpolation recur throughout the subject.

The pages are written as working notes rather than formula sheets. Each topic includes definitions, key results, a visual anchor, two worked examples, code for repeatable calculation, common pitfalls, and links to neighboring SJ Wiki sections. The repeated pattern is intentional: thermodynamics is easiest to learn when every problem is forced through the same questions about boundary choice, property model, balance law, reversibility, and physical reasonableness.

Pages​

Pages