Table 11 Radiant Fraction for Casual Gains
|
Source
|
r.f.
|
|
fluorescent light
|
0.45
|
|
tungsten light
|
0.85
|
|
high-pressure discharge lamp
|
0.62
|
|
people
|
0.20
|
|
computer equipment
|
0.22
|
Radiant fractions for plane surfaces in a room at 20°C.
Surfaces are assumed to have emissivity of 0.9.
|
Surface
Temperature (°C)
|
Vertical
surface
|
Horizontal
Surface looking down
|
Horizontal
Surface looking up
|
|
|
|
|
|
|
5
|
0.58
|
0.53
|
0.79
|
|
30
|
0.64
|
0.83
|
0.6
|
|
50
|
0.58
|
0.8
|
0.53
|
|
70
|
0.56
|
0.8
|
0.52
|
|
100
|
0.56
|
0.8
|
0.51
|
|
200
|
0.6
|
0.84
|
0.56
|
|
300
|
0.67
|
0.87
|
0.62
|
|
400
|
0.73
|
0.9
|
0.69
|
