1. Humans are able to control their rates of heat production and heat loss to maintain anearly constant core temperature of Te = 37°C under a wide range of environmentalconditions. This process is called thermoregulation. From the perspective of calculatingheat transfer between a human body and its surroundings, we focus on a layer of skin:fat, with its outer surface exposed to the environment and its inner surface at atemperature slightly less than the core temperature, T = 35°C = 308 K. Consider a personwith a skin/fat layer of thickness L =mm and effective thermal conductivity k = 0.3"- The person has a surface area A = 1.8 m? and is dressed in a bathing suit. Them· Kemissivity of the skin is ɛ = 0.95.a). When the person is in still air at T = 282 K, what is the skin surfacetemperature and rate of heat loss to the environment? Convection heat transferto the air is characterized by a free convection coefficient of h 2m2 -Kb). When the person is in water at T = 282, what is the skin surface temperatureand rate of heat loss? Heat transfer to the water is characterized by a convectioncoefficient of h = 200 W

Answered: Image /qna-images/answer/bd18c356-6dee-41d9-9063-a481b70e4cb3.jpg

a). When the person is in still air at Tm = 282 K, what is the skin surface temperature and rate of heat loss to the environment? Convection heat transfer to the air is characterized by a free convection coefficient of h= 2- m-K b). When the person is in water at T= 282, what is the skin surface temperature and rate of heat loss? Heat transfer to the water is characterized by a convection coefficient of h = 200 m.K

a). When the person is in still air at Tm = 282 K, what is the skin surface temperature and rate of heat loss to the environment? Convection heat transfer to the air is characterized by a free convection coefficient of h= 2- m-K b). When the person is in water at T= 282, what is the skin surface temperature and rate of heat loss? Heat transfer to the water is characterized by a convection coefficient of h = 200 m.K

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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Question

1. Humans are able to control their rates of heat production and heat loss to maintain a
nearly constant core temperature of Te = 37°C under a wide range of environmental
conditions. This process is called thermoregulation. From the perspective of calculating
heat transfer between a human body and its surroundings, we focus on a layer of skin:
fat, with its outer surface exposed to the environment and its inner surface at a
temperature slightly less than the core temperature, T = 35°C = 308 K. Consider a person
with a skin/fat layer of thickness L =
mm and effective thermal conductivity k = 0.3
"- The person has a surface area A = 1.8 m? and is dressed in a bathing suit. The
m· K
emissivity of the skin is ɛ = 0.95.
a). When the person is in still air at T = 282 K, what is the skin surface
temperature and rate of heat loss to the environment? Convection heat transfer
to the air is characterized by a free convection coefficient of h 2
m2 -K
b). When the person is in water at T = 282, what is the skin surface temperature
and rate of heat loss? Heat transfer to the water is characterized by a convection
coefficient of h = 200 W

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