❄️ HVAC & Refrigeration

HVAC — Lesson 9 · Superheat and Subcooling — Reading a System's Vital Signs The core idea Two temperatures tel

Heat Loads — Sizing a Cooler From First Principles The core idea A heat load is the rate at which heat enters

Duct Sizing — Why Area Beats Velocity The core idea A duct's job is to move a set volume of air (m³/h) with th

HVAC — Lesson 3 · Humidity, Relative vs Absolute, and the Dew Point The core idea Air's appetite for water vap

COP — Why a Heat Pump Can Be "400% Efficient" The core idea An engine's efficiency is useful output divided by

The Vapour-Compression Cycle: How Machines Move Heat The core idea Nothing actually makes cold. Heat is energy