Abstract
Spectrally selective glazing system attracts great attention for energy efficient radiator applications. The present work reports the possibility of a specific shield (Stainless steel/Borosilicate glass) to provide passive cooling for the purpose of reducing the use of classical active method. Radiative cooling devices require a convective shield that blocks all incoming solar radiation, but should selectively reemit radiation in the “atmospheric-window” region. In this study, borosilicate glass substrate coated with a stainless steel thin film was prepared by thermal evaporation and low pressure (6.3 × 10-3 bar) DC plasma sputtering, in order to achieve the radiative cooling effect. The optical properties of the optimal thickness thin film were measured in the wavelength range of 0.3-20 μm by an OL-750 double-beam spectroradiometer. The thin film has high visible band reflectance with high infrared band emissivity across the full 8-13 μm; which indicates that stainless steel thin film can be used as good radiative cooling material.
Highlights
Radiator serves an important role in buildings to enhance high quality of life
Most thermal energies are passing through a glazing system in modern buildings, and it is important to control them for energy efficient radiator applications
Stainless steel thin films coating on borosilicate glass substrate and their optical properties were discussed in order to assess the possibility of stainless steel thin film for radiative cooling system uses
Summary
Radiator serves an important role in buildings to enhance high quality of life. In architecture, borosilicate glass is prestigious for its carrying positive images such as transparency, natural brightness, modernity, freshness and. The use of stainless-steel as an optical thin-film material on borosilicate glass for production of elements for regulating thermal energy emittance, especially for highly reflecting mirrors of solar thermal devices, requires appropriate environmental protection. Stainless steel thin films coating on borosilicate glass substrate and their optical properties were discussed in order to assess the possibility of stainless steel thin film for radiative cooling system uses. We use the sputtering technique for stainless steel film preparation This method appears promising for the design of radiative cooling shield, where specific properties are required [12]
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