| Energy Efficient
High Performance Glass Range available in 3 variants:
NRG Lite 1 - performance data based on 6.38mm Clear Low E
NRG Intermediate 1- performance data based on Neutral 60 Low E
NRG Optimum 1 - performance data based on Neutral HL Low E
Visible Light Transmission is simply the measurable amount of solar visible light (daylight) that travels through a glazing system. A glazing system with a high VLT allows most of the daylight to pass through while a lower VLT window restricts the majority of light from entering a room.
The U-value of a window is a measurement of the rate of heat loss indicating how well your windows are keeping valuable heat in. It is expressed as Watts per square meter Kelvin W/m2 K. The lower the U-value the better the thermal performance of the glass.
The Solar Heat Gain Coefficient is the fraction of incident solar radiation admitted through a window, both directly transmitted and absorbed and subsequently released inward. SHGC is expressed as a number between 0 and 1. The lower a window's solar heat gain coefcient, the less solar heat it transmits.
The Relative Heat Gain is the amount of heat transferred through glass or a glazing system, taking into account radiative (solar) heat gain and thermal conductive heat transfer.