Patent ID: 8004839

Claim:
A cooling apparatus comprising: a plurality of server-cooling systems and at least one connection passage are placed in an air-conditioned room, each of the plurality of server-cooling systems is connected with another of the plurality of server-cooling systems by a connection passage of the at least one connection passage; the each of the plurality of server-cooling systems is one of: a first type server-cooling system having a first inlet portion for entering air of the air-conditioned room and a first outlet portion for exhausting the air through the connection passage; a second type server-cooling system having a second inlet portion for entering the air from the connection passage and a second outlet portion for exhausting the air into the air-conditioned room; and a third type server-cooling system having a third inlet portion for entering the air from a first one of the connection passage and a third outlet portion for exhausting the air through a second one of the connection passage; the plurality of server-cooling systems comprises the first type server-cooling system and at least one of the second type server-cooling system or the third type server-cooling system; the each of the plurality of server-cooling systems comprising a plurality of minimum units, respectively; each of the plurality of minimum units comprising a rack having a plurality of cases, each of the plurality of cases housing boards, the plurality of cases are stacked, a cooling coil having a coolant passage and a cooling fin, and the cooling coil is capable of cooling the air, a fan unit having at least one axial-flow fan for producing an air current of the air, a shell for placing the rack, the cooling coil and the fan unit therein and having a ventilation passage, and seal members provided between the shell and each of the cooling coil and the fan unit, each of the rack, the cooling coil and the fan unit are arranged in the shell so as to align towards a direction of the air current, and the shell of a first one of the plurality of minimum units is connected to the shell of an adjacent one of the plurality of minimum units; and a first air filter provided at the first inlet portion for filtering the air of the air-conditioned room.