本题目来源于试卷: gc textbook chater 14 heat，类别为 IB物理学
[问答题]
The floor of a house on a foundation under which the air ca8q6k/ gru*j pan flow iuuk-pd vnkj5/7 *vm y.s often cooler than a floor that rests directly on the ground (such as a concrete slap nk-d*5kmv /7v.uuyjb foundation). Explain.
参考答案:
We assume that the temperature in the house is
higher than that under the house. Thus
heat will flow through the floor out of the house. If the house sits directly on the ground or
on concrete, the heat flow will warm the ground or concrete. Dirt and concrete are relatively poor
conductors of heat, and so the thermal energy that goes into them will stay for
a relatively long time, allowing their temperature to rise and thus reducing
the heat loss through the floor. If the
floor is over a crawlspace, then the thermal energy from the floor will be
heating air instead of dirt or concrete.
If that warmed air gets moved away by wind currents or by convection and
replaced with colder air, then the temperature difference between the inside
and outside will stay large, and more energy will leave through the floor,
making the inside of the house cooler.
本题详细解析:
暂无
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