Exergy analysis of solar radiation processes - Solar Energy Sciences and Engineering Applications - page 95

Greek
α

absorptivity of radiation,%

β declination, deg

ε emissivity,%

ϕ azimuth, deg or view factor

γ radiation weakening factor

λ wavelength, m

η efficiency,%

overall entropy growth, J/K

ψ exergy/energy radiation ratio

ν oscillation frequency, 1/s

density, kg/m 3 or reflectivity of radiation,%

ρ

σ entropy of devaluation reaction, J/(K kmol)

10 − 8 W/(m 2 K 4 ) σ Boltzmann constant for black radiation σ = 5 . 6693 ×

τ transmissivity of radiation,%

ω solid angle, rd

Subscripts

B exergetic

ch chemical

E energetic

k convection

m mechanical

n standard (normal)

ph physical

r reflection

S Sun

sky sky

0 environment

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