During winter, when people are in a well-insulated house,they usually feel comfortable if the air temperature is near22°C (72°F). If you have ever spent a night in a poorly insulatedcabin in winter, however, you will recognize that paradoxically,when people are in poorly insulated buildings, they often feelchilly even when the air inside is heated to 22°C or higher. Oneimportant reason for the difference in how warm people feel inthe two sorts of buildings is that even if a well-insulated andpoorly insulated building are identical in the air temperatureinside, they differ in thermal-radiation heat transfer. Specifically,a person standing in the two types of buildings experiencesdifferent heat exchange by thermal radiation in the two. Explainhow thermal-radiation heat transfer accounts for the sense ofchill in the poorly insulated building. (Hint: Think of the outerwalls of the two types of buildings, and think specifically of thetemperatures of the interior surfaces of those walls.)
During winter, when people are in a well-insulated house,
they usually feel comfortable if the air temperature is near
22°C (72°F). If you have ever spent a night in a poorly insulated
cabin in winter, however, you will recognize that paradoxically,
when people are in poorly insulated buildings, they often feel
chilly even when the air inside is heated to 22°C or higher. One
important reason for the difference in how warm people feel in
the two sorts of buildings is that even if a well-insulated and
poorly insulated building are identical in the air temperature
inside, they differ in thermal-radiation heat transfer. Specifically,
a person standing in the two types of buildings experiences
different heat exchange by thermal radiation in the two. Explain
how thermal-radiation heat transfer accounts for the sense of
chill in the poorly insulated building. (Hint: Think of the outer
walls of the two types of buildings, and think specifically of the
temperatures of the interior surfaces of those walls.)
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