摘要 |
A system for removing heat from the engine compartment (9) of a heavy dut y truck (2). A first ventilating system (21) removes heat from the radiator (7). It is separated from a second ventilating system (51) that removes heat from the engine compartment (9). The first system takes heat from the radia tor through a plenum (23) by centrifugal squirrel cage blowers (27), and is directs it out to ambient by ductwork. The second system draws ambient air g enerally from back to front of the engine compartment, preferably by cowl in duction (53), without the use of ram air from the vicinity of the radiator. The exits of the two systems are into a slip stream of the heavy duty truck, and the exit of the second ventilating system is into a slip stream of the first, to scavenge air out of the engine compartment. |