Patent ID: 7658060

Claim:
A heat exchange system for use in lubricating systems for aircraft turbofan engine equipment in which a lubricant is provided under pressure to spaces bounded at least in part by surfaces moving relative to one another, the heat exchange system for providing air and lubricant heat exchanges to cool the lubricant at selectively variable rates in fan airstreams occurring on a stream side of an engine fan duct wall during at least some operations of the turbofan engine where the fan duct extends between the turbofan engine fan and a fan duct nozzle, the system comprising: a cooling duct extending through at least a portion of a stream structure that is positioned adjacent the engine fan duct wall in the airstreams occurring on the stream side of the engine fan duct wall, the cooling duct having a plurality of duct entrances separated from one another and each opening to at least some part of the fan airstreams of the turbofan engine and further having an exit opening about at the end of the fan duct; and a heat exchanger core provided in the cooling duct between the entrance and exit openings thereof and having a plurality of passageway structures therein about which air can pass in flowing therethrough with the passageway structures being coupled to an input conduit at one end thereof and coupled to an output conduit at an opposite end thereof to enable the lubricant to be provided, and removed from, interiors of the passageway structures through interiors of the input and output conduits.