Environmental Engineering Reference
In-Depth Information
Nomenclature
A
surface area, m
2
=
·
10
−
16
J/(m
3
K
4
)
a
universal constant
a
7
.
564
B
exergy, J
exergy of emission, W/m
2
b
10
8
m/s
c
0
velocity of light in vacuum
c
0
=
2
.
9979
·
c
p
specific heat at constant pressure, J/(kg K)
diffusion coefficient, m
2
/s or diameter, m
D
d
n
enthalpy of devaluation, J/kmol
energy, J or W/m
2
E
density of emission energy, W/m
2
e
G
gravity input, J
gravity acceleration, m/s
2
g
H
enthalpy, J or height, m
10
−
34
J s or enthalpy, J/kg
h
Planck's constant
h
=
6
.
625
×
irradiance, W/m
2
I
irradiance (par. N.4.1.2), W/m
2
IR
monochromatic directional radiation intensity, W/(m
2
m sr)
i
λ
J
radiosity, W
radiosity density, W/m
2
j
10
−
23
J/K
k
Boltzmann constant
k
=
1
.
3805
×
convective heat transfer coefficient, W/(m
2
K)
k
L
mean distance from the Sun to the Earth
L
=
149,500,000 km.
entropy of
i
λ
, W/(m
2
K sr)
L
λ
m
mass, kg
n
mass, kmol
PAR
photosynthetically active radiation
p
pressure, Pa
Q
heat, J
heat flux, W/m
2
q
R
individual gas constant, J/(kg K), or radius of the Sun
R
=
695, 500 km
r
mole ratio of the water vapor and carbon dioxide rates
r
T
relative air pressure drop
entropy, J/K or irradiance (par. N.4.1.3 and N.4.1.4), W/m
2
S
entropy of irradiance, W/(K m
2
)
SR
entropy, J/(K m
2
) or J/K kmol)
s
entropy of radiosity density, W/(m
2
K)
s
j
t
time s, or temperature, C
T
absolute temperature, K
U
internal energy, J
specific internal energy, J/m
3
u
volume, m
3
V
W
work, J
x
distance, m
Z
eZergy, J
z
mole fraction or exergy, %
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