Importance

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Abstract

Apparatus for cooling an electrical enclosure for use where headroom is limited. An imperforate top wall and a perforate ceiling wall below it define an exhaust compartment. The ceiling wall has openings above natural hot spots on heat-producing electrical components in the enclosure to receive heated air rising by convection. In one embodiment, louvered intake openings and internal baffles direct cool, external air to the bottom of the head-producing components. A fan draws heated air from the exhaust compartment and discharges it through a louvered orifice outside the enclosure, thereby augmenting the natural upflow of heated air by convection and preventing accumulation of heated air. In another embodiment, especially suited to dusty or corrosive environments, the electrical components are completely sealed, and clean inside cooling air is continuously recycled in a closed circuit between the heat-producing components and refrigerant-cooled heat-exchange apparatus. In both embodiments, the air-circulating fans and associated ductwork are supported in the housing independently of the top cover wall enabling the latter to be removed without disturbing a fan or power connection to it.

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First Claim