please help in heat transfer problem?
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 explanation for this situation (with
supporting calculations) by considering a room whose air temperature is maintained at
20℃ throughout the year, while the walls of the room are nominally at 27℃ and 14℃
in the summer and winter, respectively. The exposed surface of a person in the room
may be assumed to be at a temperature of 32℃ 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.