Provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20°C throughout the year, while the walls of the room are nominally at 27°C and 14°C in the summer and winter respectively. The exposed surface of a person may be assumed to be at a temperature of 32°C throughout the year and to have an emissivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m2
Heat Transfer
Radiation: Under conditions a room’s 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 summer. Provide a plausible
explanation for this situation (with supporting calculations) by considering a room whose air temperature is
maintained at 20°C throughout the year, while the walls of the room are nominally at 27°C and 14°C in the
summer and winter respectively. The exposed surface of a person may be assumed to be at a temperature of
32°C throughout the year and to have an emissivity 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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