Show HN: Free textbook on engineering thermodynamics

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TLDR

  • Olivier Cleynen’s free 10-chapter thermodynamics textbook covers closed/open systems, cycles, entropy, and steam/air power cycles with 59 worked examples.

Key Takeaways

  • Covers the full undergrad thermodynamics sequence: ideal gas, phase changes, Rankine, Otto, Diesel, and turbojet cycles.
  • 59 step-by-step worked examples and 96 problems with solutions included alongside the core chapters.
  • Appendices include Steam Tables sourced from freesteamtables.com and SI unit conversion references.
  • Short historical explorations connect Carnot, Boltzmann, and other foundational ideas to their engineering impact.
  • Available free online; a print edition exists for roughly 50 EUR with the author earning under 15% of cover price.

Hacker News Comment Review

  • Commenters noted the book under-covers equations of state (SAFTs, cubics, multiparameter EOS) and suggest pointing readers to CoolProp for custom fluid property generation.
  • The pricing breakdown sparked discussion: author earns under 15% on a ~50 EUR print copy, with printing estimated at 2-5 EUR and the remainder absorbed by publisher and retailer margins.
  • The payment processor takes 25% of author earnings, raising questions about platform choice for independent academic authors.

Notable Comments

  • @alan-stark: asks for reading on thermodynamics-to-ML links, noting TD ideas appear in diffusion models, VAEs, and neural net training dynamics.
  • @ginkgotree: quotes Goodstein’s States of Matter intro on Boltzmann and Ehrenfest, both of whom died by suicide while working on statistical mechanics.

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