Also called self-draft ventilation, the formula applies at an average ambient temperature of 20˚C and a maximum of 1000m above sea level.
The formula applies at an average ambient temperature of 20°C.
Refers to the losses that become heat during idle operation of the transformer.
Refers to the losses that become heat when the transformer has a load at 120°C.
Refers to the height difference between the air intake and the emission in the room in question.
The total hole area that is necessary for both inlet and outlet of the air in order to be able to get cooling through natural ventilation.
| Natural ventilation: |  |
|---|---|
| Forced ventilation: |  |