The thermal conductivities of human tissues vary greatly. Fat andskin have condu

Question

The thermal conductivities of human tissues vary greatly. Fat andskin have conductivities of about 0.20W/mK and 0.020 W/mK,respectively, while other tissues inside the body haveconductivities of about 0.50W/mK. Assume that between the coreregion of the body and the skin surface lies a skin layer of 1.0mm,fat laer of 0.50cm, and 3.2cm of other tissues.

a.) Find the R-factor for each of these layers, and the equivalentR-factor for all layers taken together, retaining two digits.

b.) Find the rate of energy loss when the core temperature is 37degrees C and the exterior temperature is 0 degrees C. Assume thatboth a protective layer of clothing and an insulating layer ofunmoving air are absent, and a body area of 2.0 m2.

How do you solve this problem?

Explanation / Answer

by using P=A (Tn-Tc)/sum of R and , R=L/K

R skin= 0.050m^2k/w

R fat =0.025 m^2k/w

R other=0.064m^2k/w

b) 2.0m^2(37c-0c)/0.139m^2 =  

530w

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