What's the Solar Heat Gain Coefficient

Time:2019/03/29 14:53:00 Browse:844

Many customers will pay attention the Solar Heat Gain Coefficient value when choosing window film and glass. What is Solar Heat Gain Coefficient?  We can measure SHGC value using LS182  window tint meter and help users choose the product that suits them.

1. What is SHGC?

As radiative heat from the sun comes from a surface at 11,000F, different calculation techniques are needed to account for the heating effect. The solar heat gain coefficient (SHGC) is defined for this purpose. When sunlight hits a window, some of it goes right through the window, some is reflected back and some is absorbed, heating up the various parts of the window. The absorbed heat can either flow to the inside of the house or the outside. The SHGC represents the fractional amount of the solar energy that strikes the window that ends up warming the house.

spectrum transmission meter

LS182 SHGC Window Tint Meter

A look at the NFRC website will find the explanation "The lower the SHCG, the better a product is at blocking unwanted Sun.” This is true, but it should be followed with"The lower the SHGC, the more a product blocks wanted sun.” For most area, most solar heat gain is unwanted, as it will increase electric bills for air conditioning. However, in cold area, solar heat gain is normally desired,especially in a winter. A window with a high SHGC will raise cooling bills, but it will generally reduce heating costs more.

LS182 SHGC Window Tint Meter is self-contained light sources and self -calibration. No manual adjustment is needed. The users only need plug the power supply, turn on the switch to choose 940nm, SHGC(Solar heat gain coefficient) and 1400nm,then put the window film in the opening. The resulting performance data appear on the display. 

Built-in four kinds of light sources: 365nm UV,380-760nm VL, 940nm and 1400nm IR
This device allows you to evaluate the thermal, UV and light transmittance properties of Window film or window tint
Can measure glass with thickness less than 47mm



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