Der er fundet flere materialer, som kan udstråle infrarød stråling i bølgelængdeintervallet 8-13 um. Sådanne materialer kan også anvendes til at køle objekter både dag og nat - fx huse og huses tage, mure mellem 5°C-12°C (resultat 2014-2021) i forhold til omgivelsestemperaturen, når der er klar himmel.<ref>[http://www.sciencedaily.com/releases/2014/11/141126133821.htm Stanford School of Engineering. (2014, November 26). High-tech mirror beams heat away from buildings into space. ScienceDaily] {{Webarchive|url=https://web.archive.org/web/20141220171950/http://www.sciencedaily.com/releases/2014/11/141126133821.htm |date=20. december 2014 }} Citat: "..."As a result of professor Fan's work, we can now [use radiative cooling], not only at night but counter-intuitively in the daytime as well."...The first part of the coating's one-two punch radiates heat-bearing infrared light directly into space...This multilayered coating also acts as a highly efficient mirror, preventing 97 percent of sunlight from striking the building and heating it up...Together, the radiation and reflection make the photonic radiative cooler nearly 9 degrees Fahrenheit [5 °C] cooler than the surrounding air during the day...Its internal structure is tuned to radiate infrared rays at a frequency that lets them pass into space without warming the air near the building..."</ref><ref>[https://www.sciencemag.org/news/2019/05/engineered-wood-radiates-heat-space-potentially-slashing-cooling-costs May. 23, 2019, sciencemag.org: This engineered wood radiates heat into space, potentially slashing cooling costs] {{Webarchive|url=https://web.archive.org/web/20190717024521/https://www.sciencemag.org/news/2019/05/engineered-wood-radiates-heat-space-potentially-slashing-cooling-costs |date=17. juli 2019 }} Citat: "..."...If used on a building’s exterior, such as in siding and roofs, the material could drop a building’s temperature as much as 10°C and reduce cooling costs as much as 60%...But in the past 2 years, researchers have devised plastic films and paints that absorb heat and re-emit that energy at longer mid-IR wavelengths, which air doesn’t absorb. If emitted toward the sky, these photons pass unimpeded and dump their energy into deep space. But to use these materials in buildings, engineers need to laminate rooftop or siding materials with the plastics or apply the heat-emitting paints...The researchers hit upon a simple chemical procedure. They soaked basswood in a solution of hydrogen peroxide, which chops normally long lignin molecules into small fragments...it turns white, reflecting virtually all incoming light. The new composite also absorbs heat from its surroundings and reradiates it as mid-IR light. That allows the material to cool surfaces to which it is attached by up to 10°C..."</ref>
<ref>[https://scitechdaily.com/radiative-cooling-and-solar-heating-from-one-system-no-electricity-needed/ March 6, 2021, scitechdaily.com: Radiative Cooling and Solar Heating From One System – No Electricity Needed. Study describes passive cooling system that aims to help impoverished communities, reduce cooling and heating costs, lower CO2 emissions] Citat: "...A study published on February 8, 2021, in the journal Cell Reports Physical Science describes a uniquely designed radiative cooling system that: [] Lowered the temperature inside a test system in an outdoor environment under direct sunlight by more than 12 degrees Celsius (22 degrees Fahrenheit). [] Lowered the temperature of the test box in a laboratory, meant to simulate the night, by more than 14 degrees Celsius (25 degrees Fahrenheit). [] Simultaneously captured enough solar power that can be used to heat water to about 60 degrees Celsius (140 degrees Fahrenheit)...The system consists of what are essentially two mirrors, made of 10 extremely thin layers of silver and silicon dioxide, which are placed in a V-shape...", [https://doi.org/10.1016/j.xcrp.2021.100338 kilde]</ref>
Samfund Teknologi