Electric generator

An electric generator comprising:

• a sealed housing to prevent a significant flow of air into the sealed housing and exiting the sealed housing, the sealed housing including:
• a rotor having channels;
• a stator enclosing the rotor;
• a water operated cooling device, comprising a water inlet for allowing cooling water to enter the sealed housing, and a water outlet for allowing the cooling water to discharge from the sealed housing, wherein the water operated cooling device is the only cooling device of the generator;
• wherein the channels in the rotor and the stator guide the cooling water through the rotor and the stator for the cooling water to absorb the heat in the rotor and the stator that heat up during operation of the electric generator;
• wherein the scaled housing includes internal air, wherein the internal air heats up during operation of the electric generator, wherein the cooling water absorbs the heat contained in the internal air in the sealed housing, and wherein the cooling water discharges the heat absorbed from the rotor, the stator and the internal air through the water outlet to outside of the sealed housing;
• wherein the sealed housing comprises an air inlet and an air outlet, at least one of the air inlet and the air outlet is provided with an adjustable opening width for adjusting air leakage, wherein except for the air inlet and the air outlet the sealed housing is hermetically sealed;
• a heat exchanger arranged to receive and reduce the temperature of the cooling water discharged through the water outlet.