Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 02 Oct 2017 My Price 7.00

environmental conditions

EXAMPLE 1.7

 

Humans are able to control their heat production rate and heat loss rate to maintain a nearly constant core temperature of Tc = 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 and fat, with its outer surface exposed to the environment and its inner surface at a temperature slightly less than the core temperature, Ti = 35°C = 308 K. Consider a person with a skin/fat layer of thickness L = 3 mm and effective thermal conductivity k = 0.3 W/m · K. The person has a surface area A = 1.8 m2 and is dressed in a bathing suit. The emissivity of the skin is s = 0.95.

 

 

1. When the person is in still air at T00 = 297 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 W/m2 · K.

2. When the person is in water at T00 = 297 K, what is the skin surface temperature and heat loss rate? Heat transfer to the water is characterized by a convection coefficient of h = 200 W/m2 · K

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Maurice Tutor
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Status NEW Posted 02 Oct 2017 02:10 PM My Price 7.00

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