What is Solar [energy] transmittance (@AM 1.5)
Solar energy transmittance is the rate at which solar energy enters to the indoor directly through a glass window.
The percentage of energy flowing into the indoor which the radiant energy of 300 nm to 2 500 nm being emitted from a solar surface temperature of approximately 6 500 K has passed 1.5 times (AM=1.5) of the atmosphere
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The transmission spectrum of the window is as below and
the solar energy weighting factor @AM=1.5 presented in ISO 9050 is follows fig. & Table [S(λ)Δ(λ)]:
When calculating the solar energy transmittance using solar weighting factor and transmittance spectrum:
Weighting factor at 2 500 nm : 1.02
Transmittance at 2 500 nm : 77.723%
T(λ)S(λ)Δλ = 77.723 x 1.02 =79.278
The sum of values calculated in the same way for the entire wavelength is
Σ S(λ)Δλ = 1 027.44
Σ T(λ)S(λ)Δλ = 93 439.186
Te = Σ S(λ)Δλ / T(λ)S(λ)Δλ = 93 439.186 / 1 027.44 = 90.943 (%)
It can be calculated the Solar [energy] transmittance is 90.94%
For the reference, Analysis results calculated using the program (Solar Transmission 90.94%, @AM=1.5).
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