) What is the ratio of the heat lost from the unit area of the skin on the calm day to the windy day. b) What will be the outer surface temperature of the skin on a calm day? What is this for the windy day. c) What should be the temperature of the air in a calm day to obtain the equivalent of the heat loss at -150C air temperature on a windy day?
The chill felt on a cold windy day is related to the increase in the heat transfer coefficient between the body skin and the surrounding atmosphere. Let's consider a 3mm thick oily skin layer, the inner surface of which is kept at 360C. On a calm day, the heat transfer coefficient on the outer surface reaches 65W / m2K with a wind speed of 25W / m2K 30km / h.
a) What is the ratio of the heat lost from the unit area of the skin on the calm day to the windy day.
b) What will be the outer surface temperature of the skin on a calm day? What is this for the windy day.
c) What should be the temperature of the air in a calm day to obtain the equivalent of the heat loss at -150C air temperature on a windy day?
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 3 images
