96
K. V. S. Teja et al.
m
Refractive index
˙
m
Mass flow rate of air (kg/s)
n
Day of the year
p
Pressure (Pa)
P
Power (kW)
Q
Heat (W)
Q
Hourly average incident heat flux (W/m
2 )
r
Radius (m)
R
Characteristic gas constant (J/kg K), R = 287 J/kg K
T
Temperature (°C)
v
Velocity (m/s)
Greek symbols
ε
Emissivity
η
Efficiency (%)
ρ
Density (kg/m
3 )
σ
Stefan-Boltzmann’s constant (W/m
2 K
4 ), σ = 5.67 × 10
−8 W/m
2 K
4
τ
Transmissivity
Subscripts
chim
Chimney
coll
Collector
conv
Convection
i
Inlet of turbine/chimney
o
Ambient
ovr
Overall
rad
Radiation
turbine Turbine
7.1 Introduction
Over the past few decades, the population has been rising at a very steep rate. This
leads a proportional growth in the energy requirement. Current major sources of
energy production have been through fossil fuels like coal, oil, natural gas. These
fossil fuels account for about 80% of total energy supply. But these resources are
not infinite and are going to deplete sometime in the near future. So, in order to
K. V. S. Teja et al.
m
Refractive index
˙
m
Mass flow rate of air (kg/s)
n
Day of the year
p
Pressure (Pa)
P
Power (kW)
Q
Heat (W)
Q
Hourly average incident heat flux (W/m
2 )
r
Radius (m)
R
Characteristic gas constant (J/kg K), R = 287 J/kg K
T
Temperature (°C)
v
Velocity (m/s)
Greek symbols
ε
Emissivity
η
Efficiency (%)
ρ
Density (kg/m
3 )
σ
Stefan-Boltzmann’s constant (W/m
2 K
4 ), σ = 5.67 × 10
−8 W/m
2 K
4
τ
Transmissivity
Subscripts
chim
Chimney
coll
Collector
conv
Convection
i
Inlet of turbine/chimney
o
Ambient
ovr
Overall
rad
Radiation
turbine Turbine
7.1 Introduction
Over the past few decades, the population has been rising at a very steep rate. This
leads a proportional growth in the energy requirement. Current major sources of
energy production have been through fossil fuels like coal, oil, natural gas. These
fossil fuels account for about 80% of total energy supply. But these resources are
not infinite and are going to deplete sometime in the near future. So, in order to