Cesium tungstate, such as Cs0.33WO3 nanopowder, is known as a NIR-shielding material for preparing sunshade glass – an energy saving glass. And the Cs0.33WO3 nanoparticles can be integrated with a phase change material such as paraffin wax to obtain a new energy-efficient composite window.
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According to the experts, Cs0.33WO3 in the window can reduce solar heat gain of the buildings. Meanwhile, the paraffin wax component can accumulate the Cs0.33WO3-captured thermal energy by its endothermic molting processes, protecting the window from overheating. When the ambient temperature drops low enough, the stored thermal energy in the paraffin wax can be gradually released back by reverse solidifying processes. Therefore, this paraffin wax–Cs0.33WO3 composite window should be very effective to keep indoor temperature stable and comfortable. Performed on a homemade house model, the paraffin wax–Cs0.33WO3 composite window can depress indoor temperature variation from 24.2 down to 7.3 °C, compared with a bare glass window. This composite window is expected to improve energy efficiency of buildings locating in areas with high day-night or summer-winter temperature fluctuations.
