Introduction to Heat Transfer
Introduction to Heat Transfer
6th Edition
ISBN: 9780470501962
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 3, Problem 3.10P

The wind chill, which is experienced on a cold, windyday, is related to increased heat transfer from exposedhuman skin to the surrounding atmosphere. Consider alayer of fatty tissue that is 3 mm thick and whose interiorsurface is maintained at a temperature of 36 ° C . Ona calm day the convection heat transfer coefficient atthe outer surface is 25 W/m 2 K, but with 30 km/hwinds it reaches 65 W/m 2 K . In both cases the ambientair temperature is 15 ° C .

  1. What is the ratio of the heat loss per unit area fromthe skin for the calm day to that for the windy day?
  2. What will be the skin outer surface temperature forthe calm day? For the windy day?
  3. What temperature would the air have to assume onthe calm day to produce the same heat loss occurringwith the air temperature at 15 ° C on the windy day?

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Chapter 3 Solutions

Introduction to Heat Transfer

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