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With the development of large electrical equipment, more and more cooling technologies are introduced to deal with the large amount of heat produced by the consumption. Close-loop self-circulation (CLSC) evaporative cooling technology is a newly developed technique for the cooling of the large electrical equipment. In certain circumstances, the air-cooling condenser is used as the secondary cooler in the evaporative cooling system of large electrical equipments. This paper mainly deal with the start-up of the CLSC evaporative cooling system, experiments and numerical simulations are carried out separately, and the results show that the structure of the inlet has great affect on the start-up of the evaporative cooling system. A reasonable structure can do great help to the start-up and the restart of cooling system.