Abstract
A skin-cooling system has been developed to reject heat from high-power electronic equipment onboard a CL-600 Challenger aircraft. This concept calls for baffled ducts at the aircraft skin to cool the air in the aft cabin, where the equipment is located. The hot air from the rack with the equipment that dissipates the most heat is exhausted Into a ceiling plenum, from which it is distributed by fans Into the baffled ducts. These ducts, which are bounded by the cold skin on one side, are used as a heat exchanger to reject the heat. The cooled air is then recirculated into the aft cabin. This paper describes a series of tests that were performed to evaluate the feasibility of providing a common inhale/exhale opening in the ceiling plenum. This opening is to prevent the ceiling fans from starving when some of the equipment is off (inhale), and to avoid excessive pressurization of the system when some or all of the ceiling fans are off (exhale). The tests were performed using a representative plenum configuration. We also describe a simulation model of the plenum flow distribution system
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