Free, in-depth courses on ventilation, natural convection, heat and mass transfer, heat exchangers, thermal comfort, and indoor air quality. Written by engineers, grounded in established textbooks and peer-reviewed research, with worked calculations in every course.
The physics everything else stands on: how heat moves by natural and forced convection, the dimensionless groups that govern it, and the correlations engineers actually use.
Buoyancy-driven flow from first principles: the governing equations, the Boussinesq approximation, the dimensionless groups that rule the physics, boundary-layer behavior, and the classic heat-transfer correlations, closing with a complete hand calculation.
Start course →From the differentially heated cavity to glazing gaps and attics: flow regimes, aspect-ratio effects, inclined enclosures, practical correlations, and the benchmark case every CFD engineer validates against.
Start course →Internal-flow heat transfer and pressure drop for real HVAC ducts: entrance effects, Dittus-Boelter and Gnielinski, rectangular ducts, mixed convection, and a full duct-sizing worked example.
Start course →The equipment and processes at the heart of every air system: heat exchangers, moist air, coils, towers, and evaporative processes.
The two great sizing methods, LMTD and epsilon-NTU, plus finned-tube coils, fouling, and a chilled-water coil selection example with latent load.
Start course →Moist-air properties and the psychrometric chart from the ground up: coil processes, mixing, humidification, and a complete air-handling-unit worked example.
Start course →Where heat and mass transfer meet: cooling towers, evaporative cooling, condensation control, and desiccant dehumidification, with a tower sizing check.
Start course →Getting the right air to the right place: air distribution strategies, buoyancy-driven ventilation, and the ventilation rates that protect health.
Mixing, displacement, and underfloor air distribution: jet behavior, diffuser selection, ventilation effectiveness and age of air, with a conference-room layout example.
Start course →Designing with buoyancy: stack effect, wind interaction, opening sizing, atria, solar chimneys, and night flushing, with a classroom sizing example.
Start course →Contaminants, the CO2 mass balance, the ASHRAE 62.1 ventilation rate procedure step by step, demand-controlled ventilation, and filtration.
Start course →Comfort science, simulation best practice, and squeezing more efficiency out of every cubic meter of ventilation air.
How comfort is quantified: human heat balance, PMV and PPD, the adaptive model, local discomfort factors, and a full worked comfort assessment.
Start course →What it takes to trust an indoor-airflow simulation: turbulence models, buoyancy and radiation, meshing, boundary conditions, validation benchmarks, and a pre-run checklist.
Start course →Reclaiming energy from exhaust air: HRV vs ERV, equipment types, frost control, savings calculations, and a simple payback sketch.
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