Plain-language explanation.
Thermodynamics studies energy — how it flows, converts, and is constrained by fundamental laws. Heat transfer studies how energy moves through conduction, convection, and radiation. Together they underpin power generation, refrigeration, and climate control.
Core concepts and standard treatment.
Core thermodynamics covers the four laws: zeroth (thermal equilibrium), first (conservation of energy — steady-flow energy equation — turbines, compressors, nozzles), second (entropy — Clausius inequality — Carnot efficiency 1-TC/TH — exergy — Gouy-Stodola theorem), and engineering cycles (Rankine — steam power — reheat — regeneration; Brayton — gas turbine — isentropic efficiency; Otto, Diesel; vapour-compression refrigeration — COP; CCGT). Heat transfer covers conduction (Fourier's law — thermal resistance analogy — fins — fin efficiency — Biot number — transient — Heisler charts), convection (Nusselt number — Dittus-Boelter correlation — natural convection — Grashof, Rayleigh; boiling — Rohsenow — critical heat flux; film condensation — Nusselt), and radiation (Stefan-Boltzmann; view factors; grey body; greenhouse radiative balance).
Deeper theory, debates and edge cases.
Advanced thermodynamics covers computational heat transfer (FVM — SIMPLE algorithm — conjugate CHT in ANSYS Fluent, OpenFOAM; discrete ordinates radiation; Monte Carlo; VOF boiling/condensation CFD), advanced energy systems (exergy analysis — Grassmann diagram; supercritical CO2 Allam cycle; ORC low-grade heat recovery — working fluid selection; thermoelectric generation — ZT figure of merit; PCM thermal energy storage; molten salt CSP), and heat exchanger design (LMTD and epsilon-NTU methods; shell-and-tube — TEMA — HTRI; plate HE — Alfa Laval; PCHE printed circuit — aerospace; fouling — Kern method; vibration-induced fatigue analysis).
How it is applied in practice.
At the chartered thermofluids engineer (CEng, IMechE) level, practitioners contribute to Int. J. Heat and Mass Transfer; design power generation systems (Hinkley Point C PWR primary circuit thermal hydraulics; CCGT optimisation — Frame 7HA; industrial CHP — CHPQA; H2 combustion NOx — lean premixed — Ansaldo H-class); lead electronics thermal management (TIM — solder, phase-change, graphite; immersion cooling — Novec — data centre PUE; heat pipe — vapour chamber — satellite thermal control — ESATAN TMS); and advise on building energy performance (dynamic thermal modelling — IES-VE, EnergyPlus; PHPP Passive House; Part L / SAP 10.2; net zero fabric-first — LETI Carbon Primer).