Solar glass sun room light transmittance

4 FAQs about [Solar glass sun room light transmittance]

What is visible light transmittance (VLT)?

Visible light transmittance (VLT) is a percentage of the visible portion of the solar energy spectrum coming through the glass. It is expressed as a figure between 0 (no light) and 100 (all light). This value measures the ability of the glass to transmit light and facilitate daylighting.

Are light transmittance and solar factor related?

Light transmittance (LT) and solar factor (Sg) are closely related . When we are looking for high-performance glazing, particularly to reduce summer overheating, we look for a low solar factor. It is then necessary to pay attention to light transmission, which is sometimes very low for solar protection devices.

Which material has the highest spectral transmittance of solar radiation?

This study analyse spectral transmission of solar radiation of glass and plastics. The 8 h transmittances are higher than at 12 h and are higher in winter than summer. Methacrylate and smoked glass have the highest transmittance in UV, VIS and NIR ranges. Polycarbonate has the lowest transmittance in UV, VIS and NIR ranges.

Which sun protection devices can be installed in parallel with glazing?

The method is applicable to any type of sun protection devices in parallel with glazing, such as shutters or blinds. Sun protection devices can be installed inside a protected room, outside or in a gap between double glazing. The method is applicable in cases when total solar transmittance through glazing ranges between 0.15 and 0.85.

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