Suppose a person with skin area 1.5 m and daily food intake of 2.63 x 10° kcal has skin temperature 33.2°C and is in a room with temperature 25°C. Using this information, select each of the true statements from the following. a. Assuming that all input energy must be released as heat in order for the person to maintain a constant body temperature, the person's total output heat flux density should be 5.13 x 10 J/(m2 - s). b. Assuming a skin emissivity of 1, the net flux density of thermal energy lost by radition from the person's body is 8.48 x 10 J/(m² s). c. In order to maintain a constant body temperature, the person would require an additional outgoing thermal energy flux density of 3.35 x 10 J/(m2 s). d. Assuming the additional heat transfer mechanism is conduction and given that the thermal conductivity of air is 2.3 x 10 4 W/(m - K), the distance over which the temperature drops from the person's skin temperature to that of the room is 6.76 × 10 ³ m.
Suppose a person with skin area 1.5 m and daily food intake of 2.63 x 10° kcal has skin temperature 33.2°C and is in a room with temperature 25°C. Using this information, select each of the true statements from the following. a. Assuming that all input energy must be released as heat in order for the person to maintain a constant body temperature, the person's total output heat flux density should be 5.13 x 10 J/(m2 - s). b. Assuming a skin emissivity of 1, the net flux density of thermal energy lost by radition from the person's body is 8.48 x 10 J/(m² s). c. In order to maintain a constant body temperature, the person would require an additional outgoing thermal energy flux density of 3.35 x 10 J/(m2 s). d. Assuming the additional heat transfer mechanism is conduction and given that the thermal conductivity of air is 2.3 x 10 4 W/(m - K), the distance over which the temperature drops from the person's skin temperature to that of the room is 6.76 × 10 ³ m.
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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Transcribed Image Text:Suppose a person with skin area 1.5 m and daily food intake of
2.63 x 10° kcal has skin temperature 33.2°C and is in a room with
temperature 25°C.
Using this information, select each of the true statements from the following.
a. Assuming that all input energy must be released as heat in order for the
person to maintain a constant body temperature, the person's total output heat
flux density should be 5.13 x 10 J/(m2 - s).
b. Assuming a skin emissivity of 1, the net flux density of thermal energy lost by
radition from the person's body is 8.48 x 10 J/(m² -s).
c. In order to maintain a constant body temperature, the person would require
an additional outgoing thermal energy flux density of
3.35 x 10 J/(m² - s).
d. Assuming the additional heat transfer mechanism is conduction and given that
the thermal conductivity of air is 2.3 x 10 W/(m - K), the distance
over which the temperature drops from the person's skin temperature to that of
the room is 6.76 × 10 31
m.
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