| A compressor generates a certain amount of waste heat depending on its drive rating. On air-cooled compressors this heat must be extracted by a flow of cooling air  C.
The volume of cooling air  C is influenced by several factors as well as the drive rating of the compressor :
- Transmission heat.
A part of the heat generated is emitted as transmission heat by the walls enclosing the installation room (including the windows and doors). The constitution of the walls, the ceiling, the floor, doors and windows have a considerable influence on the flow of cooling air  C.
- Room temperature.
The higher the temperature of the installation room, the
greater the requirement for cooling air.
- Temperature gradient.
The greater the difference Dt between the outside and inside
temperature, the lower the requirement for cooling air.
- Room height and site.
The greater the height and size of the room, the better the
distribution of the generated heat, and the requirement for
cooling air drops accordingly.
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