{"id":10128,"date":"2026-07-17T09:55:03","date_gmt":"2026-07-17T06:55:03","guid":{"rendered":"https:\/\/coatinginstitute.org\/?p=10128"},"modified":"2026-07-17T09:59:34","modified_gmt":"2026-07-17T06:59:34","slug":"passive-daytime-radiative-cooling-pdrc-paints","status":"publish","type":"post","link":"https:\/\/coatinginstitute.org\/en\/passive-daytime-radiative-cooling-pdrc-paints\/","title":{"rendered":"Passive Daytime Radiative Cooling (PDRC) Paints"},"content":{"rendered":"<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">The growing demand for cooling in buildings and infrastructure, under conditions of climate crisis and energy stress, is creating the need for new technologies that reduce thermal loads without additional electricity consumption. In this context, Passive Daytime Radiative Cooling (PDRC) is emerging as one of the most promising solutions: a purely passive technology that allows surfaces to cool below ambient temperature even under full sunlight.<\/p>\n<h2 id=\"what-is-passive-daytime-radiative-cooling\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&amp;]:clear-end text-base first:mt-0\">What is Passive Daytime Radiative Cooling?<\/h2>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">PDRC is a form of passive cooling that exploits the emission of thermal radiation towards the \u201ccold sky\u201d through the so\u2011called atmospheric window, i.e. the 8\u201313 \u03bcm region in the infrared spectrum where the atmosphere is relatively transparent.<br \/>\nA surface designed for PDRC aims to achieve two things simultaneously:<\/p>\n<ul class=\"marker:text-quiet list-disc pl-8\">\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">very high solar reflectance (0.3\u20132.5 \u03bcm), in order to avoid absorption of solar radiation,<\/p>\n<\/li>\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">very high thermal emittance in the 8\u201313 \u03bcm region, in order to reject heat to outer space.<\/p>\n<\/li>\n<\/ul>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">When these conditions are met, the net radiative heat flux can exceed the thermal gains from the sun and warm air, leading to sub\u2011ambient cooling.<\/p>\n<h2 id=\"optical-design-and-materials-for-pdrc-paints\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&amp;]:clear-end text-base first:mt-0\">Optical design and materials for PDRC paints<\/h2>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">The core of PDRC technology lies in the spectral engineering of coatings. The goal is to tailor an optical response such that the surface behaves almost like an ideal mirror in the solar spectrum and almost like an ideal emitter in the infrared region of the atmospheric window.<\/p>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">Representative material strategies include:<\/p>\n<ul class=\"marker:text-quiet list-disc pl-8\">\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">high\u2011whiteness polymeric coatings containing TiO\u2082, BaSO\u2084 or other inorganic fillers that provide strong scattering and reflectance in the visible and NIR,<\/p>\n<\/li>\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">inorganic fillers such as Al\u2082O\u2083 or Bi\u2082O\u2083, which exhibit strong emittance in the 8\u201313 \u03bcm region,<\/p>\n<\/li>\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">multilayer thin\u2011film structures with alternating materials of different refractive index, enabling fine tuning of the spectral response.<\/p>\n<\/li>\n<\/ul>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">Microstructure plays a critical role: scattering particles with appropriate size (Mie scattering), porous structures and rough surfaces increase the optical path length and the overall reflectance. At the same time, from a coating chemistry perspective, binders with high UV\u2013Vis transparency, stable dispersion at high PVC, and resistance to UV, humidity and pollution are required.<\/p>\n<h2 id=\"energy-and-environmental-benefits\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&amp;]:clear-end text-base first:mt-0\">Energy and environmental benefits<\/h2>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">In contrast to active cooling technologies, which consume electricity and discharge heat into the immediate environment, PDRC systems reject heat directly to outer space without moving parts or power consumption.<br \/>\nIntegrating PDRC paints into roofs, fa\u00e7ades and urban elements can:<\/p>\n<ul class=\"marker:text-quiet list-disc pl-8\">\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">reduce surface temperatures and, consequently, building cooling loads,<\/p>\n<\/li>\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">mitigate the urban heat island effect,<\/p>\n<\/li>\n<li class=\"py-0 my-0 prose-p:pt-0 prose-p:mb-2 prose-p:my-0 [&amp;&gt;p]:pt-0 [&amp;&gt;p]:mb-2 [&amp;&gt;p]:my-0\">\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">lower peak electricity demand for air conditioning, contributing to reduced CO\u2082 emissions.<\/p>\n<\/li>\n<\/ul>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">Recent studies show that, under favorable climatic conditions, a properly designed PDRC surface can achieve significant levels of sub\u2011ambient cooling, with temperatures several degrees below the surrounding air.<\/p>\n<h2 id=\"challenges-for-industrial-implementation\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&amp;]:clear-end text-base first:mt-0\">Challenges for industrial implementation<\/h2>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">Although the underlying principle is scientifically mature, large\u2011scale deployment of PDRC via commercial paints comes with practical challenges. The accumulation of dust and pollutants on the surface reduces both reflectance and emittance, leading to a gradual decline in cooling performance. In addition, the effectiveness is strongly dependent on climatic factors (cloud cover, humidity, atmospheric composition), which necessitates tailored solutions for each geographical region.<\/p>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">From the viewpoint of the coatings industry, issues such as adhesion to different substrates, mechanical durability, UV stability, color requirements (e.g. non\u2011white surfaces) and compatibility with existing coating systems must be addressed systematically.<\/p>\n<h2 id=\"outlook-for-the-coatings-industry\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&amp;]:clear-end text-base first:mt-0\">Outlook for the coatings industry<\/h2>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">For the paint and coatings industry, PDRC represents a characteristic example of a \u201cfunctional coating\u201d that directly links microstructure design with the energy performance of the building envelope. Current trends include the development of superhydrophobic PDRC coatings with self\u2011cleaning behavior, biomimetic structures inspired by natural high\u2011reflectance surfaces, and combinations of PDRC with other technologies such as cool roofs, thermochromic materials and photovoltaics.<\/p>\n<h2 id=\"references\" class=\"font-editorial font-bold mb-2 mt-4 [.has-inline-images_&amp;]:clear-end text-base first:mt-0\">References<\/h2>\n<p class=\"my-2 [&amp;+p]:mt-4 [&amp;_strong:has(+br)]:inline-block [&amp;_strong:has(+br)]:align-top\">Yang, S., Li, T., Zhang, X., &amp; others. (2021). Passive daytime radiative cooling: Fundamentals, material designs, and applications. <em>EcoMat, 3<\/em>(3), e12153.<br \/>\nLi, Z., Ni, Y., &amp; others. (2021). Review on passive daytime radiative cooling: Fundamentals, recent researches, challenges and opportunities. <em>Renewable and Sustainable Energy Reviews, 141<\/em>, 110794.<br \/>\nZhao, Z., &amp; others. (2025). Progress in passive daytime radiative cooling from spectral design to real application. <em>Carbon Future, 4<\/em>(1), 33\u201352.<br \/>\nRecent advances in passive daytime radiative cooling coatings: Fundamentals, strategies and prospects. (2024). <em>Progress in Organic Coatings, 190<\/em>, 107123.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The growing demand for cooling in buildings and infrastructure, under conditions of climate crisis and energy stress, is creating the [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":10129,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_vp_format_video_url":"","_vp_image_focal_point":[],"footnotes":""},"categories":[405],"tags":[529],"class_list":["post-10128","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-trends","tag-pdrc-paints"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Passive Daytime Radiative Cooling (PDRC) Paints - Institute of Coating Technologies<\/title>\n<meta name=\"description\" content=\"The growing demand for cooling in buildings and infrastructure, under conditions of climate crisis and energy stress, is creating the need for new technologies that reduce thermal loads without additional electricity consumption. 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