Extended Data Fig. 8: Urban canyon simulation results.
From: Photoluminescent radiative cooling for aesthetic and urban comfort
a, Schematic of 2D urban canyon configurations and corresponding radiative heat fluxes for PUCM simulations. Diffusive reflection/absorption was considered for walls and ground. Multiple reflection for shortwave/longwave radiation was included to obtain surface temperature and corresponding radiative heat fluxes. The aspect ratio of urban canyon is defined as W/H. b-d, Simulated temperature (maximum values in daytime, averaged over 1 month) of walls (b), ground (c), and MRT (d) with varying surface albedos of walls and aspect ratio of urban canyons. The wall temperature is lower with high albedos and small aspect ratios, while ground and MRT are higher with high albedos and large aspect ratios. e-f, Shortwave (e) and longwave (f) contribution of the MRT in (d). The increase of MRT at high albedos is predominantly due to the shortwave radiation. g-h, TDP (g) and VDP (h) with varying urban parameters (albedo and aspect ratio). The dashed lines denote the thresholds for different levels of thermal/visual comfort.
