Browse Prior Art Database

Air Cooling Scheme

IP.com Disclosure Number: IPCOM000079384D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Chu, RC: AUTHOR [+3]

Abstract

Conventional forced air approaches for cooling computers introduce ambient air at (or near) the bottom of the machine and force flow upward over the components. The necessary filtration of the cooling air is accomplished with individual filters mounted at the inlet of the air moving devices.

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Air Cooling Scheme

Conventional forced air approaches for cooling computers introduce ambient air at (or near) the bottom of the machine and force flow upward over the components. The necessary filtration of the cooling air is accomplished with individual filters mounted at the inlet of the air moving devices.

With the reverse air flow scheme shown in the figure, air is introduced near the top of the machine where it can be passed through a single large filter. The increase in available filter area makes possible substantial decreases in the required frequency of filter changes. At the same time, the location of the air inlets away from the floor, and the reduced blower suction power at this location, results in relatively cleaner air entering the filter.

Multiple air moving devices are contained in a common housing at the bottom of the machine, providing active cooling redundancy. Should one air moving device fail, the other continues to suck air through both board columns. Hinged lightweight flappers are provided to prevent the possibility of an air flow short circuit, or bypass through the air moving device which has failed. These flappers are normally held open by the air moving device outlet pressure, but close under their own weight in the event of an air moving device failure, and are held close by the suction pressure within the housing.

A further advantage of this cooling scheme is that the air exhausted out the bottom of the machine tends to dissipate a...