18
Hence, the following equation is computed as the energy deliberation from the
earth surface, which origin is the photon irradiance and ambient temperature of the
solar energy:
P
A G
PV
pvg pvg t
K
(2.1)
Here, η pvg denotes the earth surface performance rate, A pvg denotes the earth surface array (m
2
), and G t denotes the photon irradiance intake rate on the plane (W/
m
2
) of earth surface and thus η pvg could be rewritten as follows:
Fig. 2.3 The solar energy-state hydrogen depicting the absorption and emission modes, and
energy deliberation rate revealing the energy density by clarifying the optimum solar irradiance
deliberation from a photon particle at various wavelengths and frequencies of 10
17 –10
14  Hz. Then
the electron-state hydrogen energy clarification is expressed by considering a downward transition
involving emission of a solar energy with respect to ground state and excited state of solar energy
2 Solar Energy
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