An environmentally friendly cooling film for buildings based on photonic crystals

Abstract

The invention relates to a photonic crystal-based environment-friendly refrigeration sticker for buildings. The refrigeration sticker sequentially comprises a scratch-resistant wear-resisting layer, an upper base material layer, a photonic crystal refrigeration layer and a lower base material layer from top to bottom, wherein the structural formula of the photonic crystal refrigeration layer is (AB)4(CD)4(EF)4(GH)4; the photonic crystal refrigeration layer is formed by sequentially stacking a first composite layer, a second composite layer, a third composite layer and a fourth composite layer from top to bottom; the first composite layer, the second composite layer, the third composite layer and the fourth composite layer are respectively formed by alternate stacking and combination of four silicon dioxide medium layers and four titanium dioxide medium layers. Compared with the prior art, the photonic crystal-based environment-friendly refrigeration sticker is lightweight and thin, most of electromagnetic waves in sunlight can be reflected through a thin-film structure parameter design by utilizing a one-dimensional photonic crystal band gap principle; and meanwhile, the photonic crystal-based environment-friendly refrigeration sticker almost has no influence on outward thermal radiation in the buildings, and is good in refrigeration effect, beneficial to reduction of energy consumption, and environment-friendly when being applied to building walls.

Description

technical field [0001] The invention belongs to the technical field of one-dimensional photonic crystals, and relates to a cooling film, in particular to an environmentally friendly cooling film for buildings based on photonic crystals. Background technique [0002] More than 99% of the solar radiation spectrum in the upper boundary of the earth's atmosphere is between the wavelength of 0.15-4.0 microns, about 50% of the solar radiation energy is in the visible spectrum (wavelength 0.4-0.76 microns), and 7% is in the ultraviolet spectrum (wavelength <0.4 microns), 43% in the infrared spectral region (wavelength > 0.76 microns), and the maximum energy is at a wavelength of 0.475 microns. Therefore, if the radiant energy of sunlight can be selectively cut off, the purpose of cooling the room can be achieved. At present, in most cases, the cooling of buildings is mainly realized by air conditioning, which consumes a lot of energy. For example, the external walls of buil...

AI Technical Summary

Problems solved by technology

The technical problem mainly solved by the above-mentioned patented technical solution is that although some existing glass films have anti-ultraviolet function, they ignore the transmittance of visible light.

The above-mentioned patent achieves better visible light transmittance and ultraviolet reflectance by adjusting the structure of photonic crystals. However, this technical solution is used in environmental protection and cooling of buildings. different, but can not effectively reflect the visible light and infrared rays in the solar radiation, therefore, the above-mentioned patented technical scheme hardly plays a role in the indoor cooling of buildings, and the scope of application is limited.

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