Cesium tungsten oxide powder may be applied for producing a new type of window heat insulation film to provide an excellent heat insulating effect and high visible light transmittance for building. The thermal insulation effect of the cesium tungsten oxide film is derived from the near-infrared (800-2500nm) shielding performance of the cesium tungsten oxide nano particles. The better the near-infrared shielding performance, the better the heat insulating performance. And the near-infrared shielding performance of the cesium tungsten oxide film is enhanced with the increase of the cesium content, so the heat insulating effect is also enhanced with the increase of the cesium content.
Some experts have tested different cesium content of cesium tungsten oxide coated architectural glass and blank architectural glass. It is found that the temperature rise rate between the cesium tungsten oxide coated architectural glass and the blank architectural glass is different. The heating rate of the architectural glass of the cesium tungsten oxide coating film with different cesium content is obviously lower than that of the blank glass. This shows that the different cesium content of the cesium tungsten oxide film has a good thermal insulation effect.
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