glassdbase: Velux

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Velux: 59

(int) 4mm V6, 16mm 95% Argon, 4mm tempered (ext)
Velux

Reference number: X003

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
0.547	0.795	0.689	0°
0.544	0.793	0.686	15°
0.534	0.785	0.680	30°
0.507	0.752	0.675	45°
0.490	0.727	0.674	50°
0.466	0.690	0.675	55°
0.431	0.636	0.678	60°
0.382	0.560	0.682	65°
0.352	0.513	0.685	67.5°
0.317	0.460	0.688	70°
0.277	0.401	0.691	72.5°
0.234	0.337	0.694	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
0.265	0.269	15°
0.269	0.272	30°
0.288	0.291	45°
0.301	0.303	50°
0.324	0.324	55°
0.355	0.354	60°
0.401	0.397	65°
0.434	0.428	67.5°
0.471	0.465	70°
0.512	0.504	72.5°
0.555	0.548	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
0.192	0.187	15°
0.197	0.194	30°
0.204	0.202	45°
0.208	0.207	50°
0.211	0.210	55°
0.214	0.215	60°
0.217	0.220	65°
0.215	0.220	67.5°
0.212	0.219	70°
0.211	0.219	72.5°
0.211	0.219	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
0.633*	0.603*	0°
0.632	0.601	15°
0.625	0.593	30°
0.601	0.569	45°
0.586	0.553	50°
0.563	0.530	55°
0.529	0.497	60°
0.482	0.449	65°
0.450	0.419	67.5°
0.414	0.383	70°
0.374	0.344	72.5°
0.331	0.300	75°

* Extrapolated value

Selectivity index T_v/g [info] Diagram

Selectivity index T_v/g

T_v/g	Angle of incidence
1.257*	0°
1.256	15°
1.257	30°
1.251	45°
1.241	50°
1.227	55°
1.202	60°
1.163	65°
1.140	67.5°
1.111	70°
1.072	72.5°
1.019	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 = 17.12°C

Coefficients of functions
T_e, T_v, A_e [info]

T_e	T_v	A_e
-0.1211	-0.19729	-0.25518
-0.00039231	-0.00015956	0.00046733
0.76044	0.90896	0.64968
76.827	77.941	88.219
9.9938	9.8882	3.9416
1.1344	0.91468	1.4769

Secondary internal heat transfer factor [info]

q_i/A_e(φ=0°) = 0.459

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]