3-24 Supplement

When the heat loss from the plate by convection and radiation equals the solar radiation absorbed, the equation now is:

As this is a nonlinear equation, we use the iteration. First rewrite the equation as

Choose the initial guess (Since it is the solution without radiation),  then

Told

Tnew

306.40

305.56

305.56

305.65

305.65

305.64

305.64

305.64

Answer: 32.6 C

3-115 Supplement

 

A wind chill temperature table

V(wind velocity)

T(wind chill temperature)

10

7.52

20

3.18

30

0.53

40

-1.24

50

-2.47

60

-3.29

70

-3.82

80

-4.11

90

-4.21

100

-4.15