Refrigeration load is the total amount of heat that a cooling system must remove from a space to maintain desired temperature and humidity conditions. Measured in BTU/hour or tons, refrigeration load determines required system capacity. Accurate load calculations are essential for proper equipment sizing and energy efficiency.
Load Components
Sensible cooling load includes heat from outdoor conditions, solar radiation, internal equipment, and occupants. Latent cooling load addresses moisture removal. Commercial buildings may have loads of 2-5 tons per 1000 square feet, while residential homes typically require 1-2 tons per 1000 square feet. Peak loads occur during afternoon hours in summer conditions.
Calculation Methods
ASHRAE guidelines and Manual J calculations account for building construction, orientation, insulation, window characteristics, and climate zone. Dynamic load calculations consider time-varying factors and thermal mass. Undersized systems cannot maintain setpoints; oversized systems cycle inefficiently and waste energy.
Design Importance
Proper load analysis ensures equipment efficiency and occupant comfort. Seasonal variation means summer cooling loads differ significantly from winter heating loads. Professional load calculations typically cost $200-500 but prevent costly sizing errors.