During winter, when people are in a well-insulated house, they usually feel comf

Question

During winter, when people are in a well-insulated house, they usually feel comfortable if the is near 22°c (72°F). If you have ever spent a night in a poorly insulated cabin air temperat 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 hicher. 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 persorn 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.)

Explanation / Answer

In case of poorly insulated buildings,the heat loss from the inside to out side occurs via radiation and this cannot be restricted due to poor insulation.in case of insulated buildings,the outer walls are able to absorb the infra red radiation at a rate of about 90% and 60-80% of this heat passes through the outside of the wall to inside via radiation.In case of insulated buildings, the interior surfaces of the walls also prevent heat loss from the inside to outside.This results in differences in how people feel the warm in insulated and non insulated houses even if the air is at 220C.

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