Thermal Performance of White Solar-Reflective Paints for Cool Roofs and the Influence on the Thermal Comfort and Building Energy Use in Hot Climates

Experimental and Numerical Analysis on a Thermal Barrier Coating with Nano-Ceramic Base: A Potential Solution to Reduce Urban Heat Islands?

“…The ambient temperature within the zone where the scaled-down prototype is situated is consistently maintained at 26 • C. In a general sense, as it can be seen in Table 5, there is an observed inclination for the blue-colored coating to manifest higher surface temperatures in the majority of scenarios, while the studied HE-HR-TBC is the most effective one to reduce roof surface temperatures in all scenarios, even compared to the white coating. This is in agreement with previous works [33][34][35]45].…”

“…TBC studies, for building applications, can mainly be classed into two parts: experimental and numerical. Experimental ones mainly compare TBCs with traditional coatings or other insulation systems, with the aim of reducing building energy needs or improving indoor thermal comfort [33][34][35][36][37]. Simulations focus on evaluating building energy savings or optimizing building envelope design to improve user comfort and decrease energy consumption [38][39][40][41][42][43][44][45][46].…”

“…• TBCs are often called "cool paints" in UHI papers and as reflective coatings even if some high emissive properties are mentioned; • Reflective paints are more efficient for avoiding solar energy absorption and reducing wall surface temperatures, with higher solar reflectances [33][34][35]45]; • Reflective paints can reduce inside air temperature in summer and increase it in winter, and so on, to be closer to the inside comfort temperature [35,[38][39][40][41][42][43][44] The TBC has to be placed outside the wall to be the most effective [38];…”

Low-energy building envelope design in Lebanese climate context: the case study of traditional Lebanese detached house

“…Three different solar absorption coefficient values corresponding to different colors (and textures) of the external opaque envelope surface (walls and roof) were considered: 0.3 (light color), 0.6 (medium color, base case), and 0.9 (dark color) [22,23]. A low solar absorptance allows a better reflection of solar radiations on the opaque building envelope and thus reducing their influence on the building thermal behavior; however, these radiations are beneficial in winter conditions allowing us to get a free additional heating source, but are undesirable in summer.…”

Comparison of the performance of different facade materials for reducing building cooling needs

“…Several studies about urban radiative cooling attempt to develop special materials in order to maximize cooling derived from this source (Cheng et al, 2005;Dornelles et al, 2011;Doya et al, 2012;Kai et al, 2010;Karlessi et al, 2009;Synnefa et al, 2005). Usually, the component of the building that is recommended for use as a radiating surface is the roof, as it turns out to be the most advantageous orientation to "see" the sky (Givoni, 1998).…”