1.29 Under conditions for which the same room temperatureis maintained by a heating or cooling system, it is notuncommon for a person to feel chilled in the winter butcomfortable in the summer. Provide a plausible expla-nation for this situation (with supporting calculations)by considering a room whose air temperature is main-tained at 20°C throughout the year, while the walls ofthe room are nominally at 27°C and 14°C in the sum-mer and winter, respectively. The exposed surface of aperson in the room may be assumed to be at a tempera-ture of 32°C throughout the year and to have an emis-sivity of 0.90. The coefficient associated with heattransfer by natural convection between the person andthe room air is approximately 2 W/m².K.

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Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible expla- nation for this situation (with supporting calculations) by considering a room whose air temperature is main-

Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible expla- nation for this situation (with supporting calculations) by considering a room whose air temperature is main-

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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1.29 Under conditions for which the same room temperature
is maintained by a heating or cooling system, it is not
uncommon for a person to feel chilled in the winter but
comfortable in the summer. Provide a plausible expla-
nation for this situation (with supporting calculations)
by considering a room whose air temperature is main-
tained at 20°C throughout the year, while the walls of
the room are nominally at 27°C and 14°C in the sum-
mer and winter, respectively. The exposed surface of a
person in the room may be assumed to be at a tempera-
ture of 32°C throughout the year and to have an emis-
sivity of 0.90. The coefficient associated with heat
transfer by natural convection between the person and
the room air is approximately 2 W/m².K.

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