本题目来源于试卷: gc textbook chater 14 heat，类别为 IB物理学
[问答题]
Ceiling fans are sometimes reversiblednts3eu (,qo) ,bd9xl 6+h s3czi( tm dzg/y7:v so that they drive the air down in one season and pull it up in another season. Which way should you set the fan for summer? For wilh szmvci+g7 td :bx(yz36d9/ nter?
参考答案:
A ceiling fan makes more of a “breeze” when it
is set to blow the air down (usually called the “forward” direction by fan
manufacturers). This is the setting for
the summer, when the breeze will feel cooling since it accelerates evaporation
from the skin. In the winter, the fan
should be set to pull air up. This forces
the warmer air at the top of the room to move out towards the walls and
down. The relocation of warmer air keeps
the room feeling warmer, and there is less “breeze” effect on the occupants of
the room.
本题详细解析:
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