water vapor cooling

The solar optical properties of micro- and meso-porous materials that can be building integrated or roof added for evaporating cooling purposes were studied and compared with conventional building materials. The results are interpreted in correlation with their water absorption capacity. For further studying their solar optical properties, absorbance measurements were solar-weighted in accordance with the ASTM G173 standard. Mesoporous materials presented high irradiation absorbance in the IR spectrum with significant variation depending on the water loading at different relative humidity.