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. The infrared portion of solar energy is only one part of the total energy transmitted to earth within the solar spectrum and it does not take into account the significant effects of absorption. Most window film companies out there only display the near infrared rays wavelength of 900nm 1100nm giving the misleading data of 99 ir rejection. Window films are capable of rejecting infrared ir but oftentimes this can be mistaken for total solar energy rejection.

Most tinting shops use infra red rejection irr as a guide to the level of heat rejection. The higher the percentage the higher the percentage of solar energy deflected. 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. Total solar energy rejected tser is a factor that describes the total amount of solar energy uv visible ir that is rejected from passing through glass.

Furthermore there is no standard method to report these values and most window film product manufacturers unlike vkool report ir rejection. So if a film has a 65 ir it means the film rejects 65 but lets in 35 ir. Measured over the wavelength from 780nm 2500nm. However irr does not measure the total amount of heat that is.

Tser includes visible light infrared radiation and ultraviolet energy. 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 number the higher the infrared rays rejected. Total solar energy rejected tser is the percentage of the total solar energy that is rejected.

The total amount of infrared rays rejected by the window film glass. Two common heat rejection indexes used are irr infrared rejection and tser total solar energy rejection. When the sun is directly overhead all vertical windows with or without film have 100 total solar energy rejection.