Cooling circuit for an electric generator

A nacelle comprising:

• an electric generator, wherein the electric generator comprises a stator and a rotor, the rotor being rotatable with respect to the stator about a rotation axis, an air gap being interposed between the stator and the rotor, wherein the electric generator further comprises a first liquid cooling circuit for cooling the stator and at least a portion of a second cooling circuit, a liquid first coolant being circulated in the first liquid cooling circuit, wherein the first liquid cooling circuit comprises a first heat exchanger for exchanging heat between the liquid first coolant and a second coolant being circulated in the second cooling circuit, wherein the second coolant is air, wherein the second cooling circuit comprises an inlet for receiving air from a first ambient, the air flowing from the inlet to the first heat exchange, an outlet for delivering air towards a second ambient, the air flowing from the first heat exchanger to the outlet, a by-pass for delivering a stream of air from the inlet to the air gap, and a fan located between the inlet and the outlet and downstream from the first heat exchanger and the air gap to circulate the air through the first heat exchanger and the stream of air to the air gap,
• a nacelle cooling circuit for providing cooling power to the nacelle, wherein the nacelle cooling circuit and the second cooling circuit are separated, and
• a converter and/or a transformer and/or a mechanical equipment, the nacelle cooling circuit for providing cooling power to the converter and/or transformer and/or mechanical equipment.