Heating vs. Cooling Load Calculation: Steady-State, Thermal Mass & Time Lag Explained

Why are heating and cooling loads calculated differently? This video breaks down the fundamental distinction between steady-state heating design and dynamic cooling load analysis. We explain the U-factor, thermal bridging, area-weighted averaging, and why the heating system is sized for the dead of night while cooling requires a time-lag analysis of solar radiation and thermal mass. Learn how radiant heat creates a thermal battery effect in building materials, delaying peak heat transfer by hours and preventing simultaneous peak loads. Discover why simply adding worst-case component loads leads to oversized chillers, short cycling, and poor dehumidification. Mastering these principles is essential for accurate HVAC design and energy-efficient buildings. For in-depth technical breakdowns and more engineering insights, visit STEPX Journal at https://stepxjournal.org/. #HVAC #Engineering #LoadCalculation #ThermalMass #BuildingScience #MechanicalEngineering #EnergyEfficiency #HeatTransfer #STEPXJournal