glassdbase: Velux

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Velux: 73G

(int) 6mm laminated, 14,5mm 95% Argon, 4mm tempered V6 (ext)
Velux

Reference number: X009

Brief information Transmittance Total solar energy transmittance Selectivity index General color rendering index

Transmittance T_e, T_v, T_e/T_v Diagram

	Solar direct transmittance T_e [info]
	Light transmittance T_v [info]
	T_e/T_v [info]

T_e	T_v	T_e/T_v	Angle of incidence
0.477	0.770	0.620	0°
0.473	0.767	0.617	15°
0.464	0.758	0.611	30°
0.439	0.726	0.605	45°
0.425	0.703	0.604	50°
0.403	0.669	0.603	55°
0.373	0.617	0.604	60°
0.331	0.546	0.607	65°
0.305	0.501	0.609	67.5°
0.274	0.449	0.611	70°
0.239	0.390	0.613	72.5°
0.200	0.325	0.613	75°

Reflectance R_e, R_e' Diagram

	Solar direct reflectance R_e [info]
	Solar direct reflectance, inverted light propagation R_e' [info]

R_e	R_e'	Angle of incidence
0.269	0.242	15°
0.270	0.244	30°
0.285	0.259	45°
0.295	0.269	50°
0.313	0.288	55°
0.340	0.315	60°
0.380	0.356	65°
0.409	0.385	67.5°
0.445	0.420	70°
0.481	0.458	72.5°
0.519	0.499	75°

Absorptance A_e, A_e' Diagram

	Solar direct absorptance A_e [info]
	Solar direct absorptance, inverted light propagation A_e' [info]

A_e	A_e'	Angle of incidence
0.258	0.285	15°
0.266	0.293	30°
0.276	0.302	45°
0.281	0.306	50°
0.283	0.309	55°
0.287	0.312	60°
0.289	0.313	65°
0.286	0.310	67.5°
0.281	0.306	70°
0.280	0.303	72.5°
0.281	0.301	75°

Total solar energy transmittance g, g' Diagram

	Total solar energy transmittance g [info]
	Total solar energy transmittance, inverted light propagation g' [info]

g	g'	Angle of incidence
0.553*	0.567*	0°
0.551	0.565	15°
0.544	0.558	30°
0.523	0.537	45°
0.509	0.523	50°
0.489	0.503	55°
0.460	0.474	60°
0.418	0.432	65°
0.391	0.405	67.5°
0.359	0.373	70°
0.324	0.337	72.5°
0.284	0.297	75°

* Extrapolated value

Selectivity index T_v/g [info] Diagram

Selectivity index T_v/g

T_v/g	Angle of incidence
1.392*	0°
1.391	15°
1.394	30°
1.389	45°
1.381	50°
1.367	55°
1.343	60°
1.304	65°
1.281	67.5°
1.251	70°
1.206	72.5°
1.143	75°

* Extrapolated value

Transmittance Reflectance Absorptance Color rendering
Dynamic temperature simulation of a standard room

Spectral transmittance T [info] Diagram


0°	15°	30°	45°	50°	55°	60°	65°	67.5°	70°	72.5°	75°

Spectral reflectance R [info] Diagram


15°	30°	45°	50°	55°	60°	65°	67.5°	70°	72.5°	75°

Spectral reflectance, inverted light propagation R' [info] Diagram


15°	30°	45°	50°	55°	60°	65°	67.5°	70°	72.5°	75°

Spectral absorptance A [info] Diagram


15°	30°	45°	50°	55°	60°	65°	67.5°	70°	72.5°	75°

Spectral absorptance, inverted light propagation A' [info] Diagram


15°	30°	45°	50°	55°	60°	65°	67.5°	70°	72.5°	75°

Maximum temperature rise in temperature simulation (°C) [info]

ΔT_max = 14.98°C

Coefficients of functions
T_e, T_v, A_e [info]

T_e	T_v	A_e
-0.078993	-0.15901	-0.53251
-0.00046984	-0.000311	0.0005962
0.74531	0.96127	0.88794
74.84	76.585	91.484
9.6285	9.4759	4.4963
1.3348	1.033	1.1351

Secondary internal heat transfer factor [info]

q_i/A_e(φ=0°) = 0.302

Dynamic temperature simulation of a standard room [info]

Location: ZÃ¼rich
Time period: 1. August - 10. August
Orientation of windows: South
Air change rate: 1.0
initial temperature: 20° C
Standard room: 1A [info]