Internal loads
Short definitionThe heat given off inside the room by lighting, workers, forklifts and evaporator fans.
Everything that runs inside the room produces heat. Lighting and evaporator fan motors are a continuous load. Workers and forklifts add load for as long as they are inside.
In small rooms internal loads look negligible, but in large, busy cold stores they become a significant part of the total. The difference between an electric forklift and an engine-powered one is also large.