Cooling arrangement having a closed loop, a semi-open loop and at least one fan

A method for cooling of a heat source, the method comprising:

• causing a flow of a first cooling fluid in a closed loop, the closed loop comprising:
• a primary side of a liquid-to-liquid heat exchanger, the primary side being adapted for receiving the first cooling fluid heated by a heat source,
• a first air-to-liquid heat exchanger adapted for receiving the first cooling fluid from the primary side of the liquid-to-liquid heat exchanger, and
• a first pump adapted for receiving the first cooling fluid from the first air-to-liquid heat exchanger and for returning the first cooling fluid to the heat source;
• causing a flow of a second cooling fluid in a semi-open loop, the semi-open loop comprising:
• a tank adapted for storing the second cooling fluid,
• a second pump adapted for drawing the second cooling fluid from the tank,
• a secondary side of the liquid-to-liquid heat exchanger, the secondary side being adapted for receiving the second cooling fluid from the second pump,
• an evaporating pad adapted for receiving the second cooling fluid from the secondary side of the liquid-to-liquid heat exchanger and for returning at least a portion of the second cooling fluid to the tank, and
• an inlet fluidly connected to a source of the second cooling fluid,
• controlling the inlet for maintaining a level of the second cooling fluid in the tank;
• and
• controlling at least one fan for causing an air flow through the evaporating pad and through the first air-to-liquid heat exchanger.