thermal insulation performance of heat rejection window film
With the impact of global warming, the window film has been recognized by more people. Due to the advantages of UV protection, explosion-proof, heat insulation, energy saving, privacy protection, durability, and environmental protection, the heat rejection window film industry occupies a huge market share in terms of environmental protection and energy saving. With the increasing awareness of energy conservation among the people , Has heated up the entire market of heat rejection window film, and has also made it an energy-saving product widely used in developed countries in Europe and America. Let's take a look at the thermal insulation performance of the heat rejection window film!
The main purpose of the heat rejection window film is to save energy, with UV protection and safety and explosion-proof functions. This building heat rejection window film can be a heat-reflective film and a low-radiation film.
The heat rejection window film is a new type of energy-saving building material. The heat rejection window film uses a special polyester film as the base material. The polyester film is coated with various high-reflectivity metals or Metal oxide coating is a kind of functional glass film that is transparent and highly heat-insulating, which is compounded and pressed by a special process. It can transform cheap ordinary transparent flat glass into a heat-insulating window film with multiple colors and multiple functions. , Equivalent to a transparent sun protector.
Unlike curtains and blinds that only block light but not heat insulation, the metal spray layer of the heat rejection window film can reflect and absorb up to 80% of infrared rays. When the outdoor temperature of the heat rejection window film is 38℃～39℃, the room temperature of the room with heat rejection window film is 3℃～5℃ lower than the indoor temperature of the ordinary glass room. Tests show that it can save more than 30% of air conditioning electricity. The membrane is especially suitable for houses with south, west, east and large glass areas.
The thermal insulation performance of the thermal window film can be seen through two indicators: E value and K value (U value). The first indicator is the emissivity coefficient, and the latter is the heat transfer coefficient. The smaller the value, the better the heat preservation performance. The thermal insulation performance of the heat rejection window film, as far as the heat rejection window film currently on the market, has yet to be improved, compared with the design indicators for building doors and windows or exterior walls, it is still relatively poor. For example: the design index requires the heat transfer coefficient to reach 2.5, but the index of the heat rejection window film is between 4.5-6.5.
So, don't be fooled by exaggerated and irresponsible propaganda. In the past few years, because of this problem, some areas have adopted a large number of thermal window films in residential buildings, which has caused very irresponsible waste and errors.
Reasonable use of heat rejection window film needs to be evaluated by experts, and the thermal insulation effect of heat rejection window film should be calculated based on the condition of the original glass doors and windows and the overall building.
The above is an introduction to the thermal insulation performance of the heat rejection window film. At present, the heat rejection window film industry has huge development potential, and the use of heat rejection window film has a great effect on energy saving.
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