Transmission Flashcards
1
Q
Rate of heat flow
A
/\Q/ /\t = KA/\T /l
2
Q
Unit of thermodynamics constant K
A
Wm-1K-1
3
Q
Convection
A
Is the transfer of heat by actual motion of matter
4
Q
Carriers of radiant energy
A
Electromagnetic waves
5
Q
Absorptive power (a)
A
a = energy absorbed/ energy incident
6
Q
For a perfect black body a =
A
1
7
Q
For a perfect black body integral of specific absorptive power
A
=a
8
Q
Emissive power (e)
A
e= (/\Q/ /\t)/A
9
Q
Emissivity
A
It’s the ratio of emissive power of a body to the emissive power of a perfectly black body
10
Q
Amount of heat incident =
A
Qabsorbed + Qrelflected + Qtransmitted
11
Q
absorptivity
A
a= Qa/Qi
12
Q
Reflectivity
A
r = Qr/Qi
13
Q
Transitivity
A
t= Qt/Qi
14
Q
No material body is
A
Perfectly black
15
Q
Nearly perfect black body
A
Platinum and lamp black
