| 摘要 |
A passive thermal actuator is used to control the position of a vent door mounted on an enclosure, to thereby selectively permit cooling air flow to one or more electronic units disposed within the enclosure. The passive thermal actuator is coupled to the vent door, is at least thermally coupled the electronics unit, and is comprised at least partially of a material, such as a shape memory alloy (SMA), that has a shape or volume that varies with electronics unit temperature variations. The passive thermal actuator, in response to the electronics unit temperature variations, selectively moves the vent door between its open and closed positions.
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