THERMAL PERFORMANCE OF URBAN FACADES USING DIFFERENT CERAMIC CLADDINGS
DOI:
https://doi.org/10.46421/encac.v17i1.4117Keywords:
solar reflectance, solar orientation, facades, ceramic claddingsAbstract
The incident solar radiation on urban facades with certain coatings can generate heat accumulation in cities, so the envelopes of buildings can cause thermal discomfort to the inhabitants and increase cooling demand in buildings. Therefore, the present paper evaluates the thermal performance of facades with ceramic coatings of different solar reflectances, investigating the influence of north, south, east and west orientations. Thus, outdoor experiments was conducted in a typical summer day. Surface temperature, spectral reflectance an air temperature measurement were collected. The results show that the east facade had the highest average surface temperature during the day, 33.0°C, compared to 28.3°C, 27.8°C and 27.7°C on the north, south and west facades, respectively. However, it showed a rapid cooling at night with an average surface temperature of 26.4°C compared to 28.5°C, 26.7°C and 34.7°C on the north, south and west facades, respectively. West façade had the highest average maximum surface temperature, 63.9°C, a difference of 24.9°C from the south façade. On the other hand, coatings of different colors and reflectances present different thermal behavior on different facades. Moreover, the increase in reflectance from 3.7% (AZE_LB) to 50.5% (BR_LB) can generate a difference in the maximum surface temperature of 18.9°C (west), 15.1°C (east), 7.6°C (north) and 3°C (south). Thus, the considerable influence of surface characteristics and orientation on the thermal performance of urban facades is highlighted, for the correct use of coatings and for mitigating urban heating.
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