Cooling apparatus for a closed housing

A cooling apparatus for a housing which is provided with an opening at the upper part thereof, comprising:

• a casing located on the upper part of the housing and including a bottom plate to close the opening and a chamber;
• a partition wall provided in the casing to divide the chamber into a first chamber section and a second chamber section;
• said bottom plate having a first inlet opening and a first outlet opening, said first chamber section communicating with the interior of the housing by means of the first inlet opening and the first outlet opening, and said casing having a second inlet opening and a second outlet opening, said second chamber section communicating with the exterior of the housing by means of the second inlet opening and the second outlet opening;
• heat exchange means including a plurality of heat pipes provided in the casing through the partition wall with coolant therein for exchanging heat in the first chamber section with heat in the second chamber section, each of said heat pipes having one end portion in the second chamber section above the first inlet opening and the other end portion in the second chamber section under the second inlet opening, wherein said plurality of heat pipes are disposed in an inclined plane such that said one end portion is located lower than said other end portion;
• a first fan provided in the first chamber section to generate a first air stream passing through the first inlet opening and the first outlet opening and passing by the one end portion of the heat pipe;
• a second fan provided in the second chamber section to generate a second air stream passing through the second inlet opening and the second outlet opening and passing by the other end portion of said heat pipe;
• and
• driving means provided in the casing for driving the first and second fans.