##### A person has a thermal conductivity of 0.18 W/m·K between his inner core and his

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1. A person has a thermal conductivity of 0.18 W/m·K between his inner core and his skin with an effective shell thickness of 1.6 cm between his core and skin. If his inner core is at the normal 98.6°F, and his skin has a surface area of 1.62 m2, what will be his rate of loss of thermal energy due to conduction through his skin if his skin temperature is 25.0°C?

 a. 137 W b. 350 W c. 219 W d. 354 W e. 134 W
Jun 28th, 2015

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Heat flow per unit time (dQ/dt ) =k A dT/dx

k =0.18  w/mk , T2=98.6F or 37°C  ; T1= 25°C  dx=1.6cm =0.016  m

hence dT = 37-25 = 12

therefore dQ/dt= 0.18 * 1.62 * (12/0.016) = 218.7 W

Option - C

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Jun 28th, 2015

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Jun 28th, 2015
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