Total Solar Energy Rejection Vs Infrared Rejection

Improperly educated window film dealers crafty marketing on the part of manufactures and a lack of standardized testing can propagate misinformation leading a consumer to conclude that a window film will reject up to 98 of the heat.

Total solar energy rejection vs infrared rejection.

Sunlight solar radiation is made up of 2 ultraviolet 49 visible light and 49 infrared energy and all of this energy generates heat if it enters a room through a window. Window films are capable of rejecting infrared ir but oftentimes this can be mistaken for total solar energy rejection. The ir rejection rate is a number that lets customer understand that the film can reject majority of the heat from infrared it does not mean that if a large portion of the ir is blocked. Furthermore there is no standard method to report these values and most window film product manufacturers unlike vkool report ir rejection.

Most window film companies out there only display the near infrared rays wavelength of 900nm 1100nm giving the misleading data of 99 ir rejection. However irr does not measure the total amount of heat that is. Irr measures only the amount of ir infrared component that is rejected by the window film. The total amount of infrared rays rejected by the window film glass.

Although it may be natural to consider heat when you think of ir this is not accurate because infrared rays only account for just over half of the total solar energy. The higher the percentage the higher the percentage of solar energy deflected. Measured over the wavelength from 780nm 2500nm. Total solar energy rejected tser is the percentage of the total solar energy that is rejected.

When the sun is directly overhead all vertical windows with or without film have 100 total solar energy rejection. So if a film has a 65 ir it means the film rejects 65 but lets in 35 ir. The higher the number the higher the infrared rays rejected. Most tinting shops use infra red rejection irr as a guide to the level of heat rejection.

Two common heat rejection indexes used are irr infrared rejection and tser total solar energy rejection. Tser includes visible light infrared radiation and ultraviolet energy. A lot of people think that infrared ir rejection and total solar energy rejection are the same thing but this is not the case.