Mapping Nighttime and All-Day Radiative Cooling Potential in Europe and the Influence of Solar Reflectivity

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2021Suggested citation
Vilà Miró, Roger;
Medrano Martorell, Marc;
Castell, Albert;
.
(2021)
.
Mapping Nighttime and All-Day Radiative Cooling Potential in Europe and the Influence of Solar Reflectivity.
Atmosphere, 2021, vol. 12, núm. 9, 1119.
https://doi.org/10.3390/atmos12091119.
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Radiative cooling is a natural process to cool down surfaces through the rejection of
thermal radiation using the outer space as a cold sink, taking advantage of the transparency of the
atmospheric windows (8–14 µm), which partially matches the infrared radiation band. With the
development of new materials that have a high reflectivity of solar radiation, daytime radiative
cooling can be achieved. This phenomenon depends on the optical properties of the surface and the
local weather conditions. In this research, climatological data from 1791 weather stations were used
to present detailed nighttime and all-day radiative cooling maps for the potential implementation
of radiative cooling-based technologies. The paper offers a parametric study of the variation of the
potential as a result of decreasing the solar reflectivity. The results show that southern Europe is
the region with the highest potential while northern Europe holds more hours of available radiative
cooling. After varying the solar reflectivity from 1 to 0.5 the average power reduces from 60.18 to
45.32 W/m2
, and energy from 527.10 to 264.87 kWh/m2
·year. For solar reflectivity lower than 0.5,
all-day radiative coolers behave as nighttime radiative coolers, but power and energy values improve
significantly for high values of solar reflectivity. Small variations of solar reflectivity have greater
impacts on the potential at higher reflectivity values than at lower ones.
Is part of
Atmosphere, 2021, vol. 12, núm. 9, 1119European research projects
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Except where otherwise noted, this item's license is described as cc-by (c) Roger Vilà, Marc Medrano, Albert Castell, 2021
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