Potential for Application of Retroreflective Materials instead of Highly Reflective Materials for Urban Heat Island Mitigation

Table 1

Summary of influence of HR envelopes on the surface temperatures.

Reference	Methodology	Surface temperature change
[30]	Using CFD simulation and TRNSYS.	In a typical summer period, the surface temperature decreased up to 12°C.
[31]	Using weather research and forecasting (WRF) v3.2.1 model.	Summer afternoon temperature in urban locations reduces by 0.11–0.53°C and some rural locations show temperature increases of up to 0.27°C.
[32]	Monitoring roof surface units by experiment.	Daytime temperature of gray paint is almost 10°C higher than that of white paint in August.
[33]	Installing a cooling roof and measuring temperature and so forth.	From April to September, temperature of roof decreased up to 20°C.
[34]	Monitoring white and black roofs.	On a warm day, a reduction of 26°C by white roof in midafternoon occurs.
[35]	Applying reflective roofs on two small nonresidential buildings and measuring temperature and so forth.	Average reduction of about 10°C in daytime during the summer period occurs.
[36]	Using energy balance model.	Temperature reduction of up to about 15°F in July occurs.
[37]	Using TRNSYS software.	Temperature reduction of up to 25°C during summer occurs.