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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.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.62P
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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.
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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