{"id":24101,"date":"2021-02-01T09:37:05","date_gmt":"2021-02-01T08:37:05","guid":{"rendered":"https:\/\/breinco.com\/breincosmartblog\/solar-reflectance-index-sri-minimizing-the-heat-island-effect-in-urban-environments\/"},"modified":"2021-02-01T09:37:05","modified_gmt":"2021-02-01T08:37:05","slug":"solar-reflectance-index-sri-minimizing-the-heat-island-effect-in-urban-environments","status":"publish","type":"post","link":"https:\/\/breinco.com\/en\/breincosmartblog\/solar-reflectance-index-sri-minimizing-the-heat-island-effect-in-urban-environments\/","title":{"rendered":"Solar Reflectance Index (SRI): Minimizing the heat island effect in urban environments"},"content":{"rendered":"<h2><\/h2>\n<h2><strong>What is SRI (Solar Reflectance Index)? <\/strong><\/h2>\n<p> The SRI value allows a finish to be categorized based on its ability to help mitigate the urban heat island effect. Dark surfaces that heat up and store heat should be avoided; instead, light-colored surfaces should be used.\u00a0 According to the ASTM E 1980-11 standard, opaque coating materials placed horizontally or with a slight slope are characterized by the so-called <strong>Solar Reflectance Index (SRI).<\/strong> This Index is calculated from solar reflectance (SR) and the thermal emissivity degree (\u03b5),\u00a0 and constitutes a measure of the relative heating of materials, taking into account the absorbed solar radiation and the heat radiated to the sky.\u00a0 Therefore, to know the <strong>(SRI)<\/strong> of a given material, we need to obtain two prior values of the material through testing:\u00a0 its solar reflectance and its thermal emissivity. <\/p>\n<ul>\u00a0 \t<\/p>\n<li>SOLAR REFLECTANCE (SR): The ratio of reflected solar flux to incident solar flux, measured in accordance with ASTM E 903, ASTM E 1918, or ASTM C 1549.<\/li>\n<p>\u00a0 \t<\/p>\n<li>THERMAL EMISSIVITY (\u03b5): A concept that measures the effectiveness in emitting energy as thermal radiation, ranging between 0.00 and 1.00. It is measured according to ASTM E 408 or ASTM C 1371.<\/li>\n<\/ul>\n<figure id=\"attachment_2331\" aria-describedby=\"caption-attachment-2331\" style=\"width: 626px\" class=\"wp-caption aligncenter\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-2331\" title=\"Testing process for SRI determination\" src=\"https:\/\/breinco.com\/wp-content\/uploads\/2021\/02\/tecnalia.jpg\" alt=\"Person performing the test for the determination of SRI of various materials\" width=\"626\" height=\"353\" \/><figcaption id=\"caption-attachment-2331\" class=\"wp-caption-text\">Testing process for SRI determination<\/figcaption><\/figure>\n<h2><\/h2>\n<h2><strong>What is the Heat Island?<\/strong><\/h2>\n<p> The urban heat island is a phenomenon that occurs in urban and suburban areas as a result of using materials with a high capacity for absorbing and retaining solar heat (albedo), far exceeding those of natural materials or less developed rural areas (Gartland, 2008).\u00a0 High urban temperatures increase energy consumption, raising electricity demand and pollution problems; furthermore, their results increase the ecological footprint, decrease thermal comfort, and create health problems for inhabitants. In order to reduce the cooling energy demand of buildings and limit the city heat island effect, within the framework of American standards, the optical properties of construction materials began to be included as design criteria.\u00a0 New projects or urban renovations must consider all sustainability variables in their design. One of the Sustainable Building certifications is that carried out by the U.S. GREEN BUILDING COUNCIL and is called LEED v4.1. This is one of the most widely used green building rating systems in the world. This certification provides a framework for healthy, highly efficient, and low-cost sustainable constructions.\u00a0 LEED defines a scoring system for the environmental and sustainable criteria of the project; specifically, it addresses the Heat Island concept in the sections that analyze project sustainability (SS Credit &#8211; Sustainable Sites), defining the following purpose: <\/p>\n<p style=\"text-align: center;\"><strong><em>To minimize effects on microclimates and human and wildlife habitats by reducing heat islands.<\/em><\/strong><\/p>\n<p> &nbsp;\u00a0 <figure id=\"attachment_2327\" aria-describedby=\"caption-attachment-2327\" style=\"width: 639px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-2327\" title=\"Urban Heat Island temperature graph\" src=\"https:\/\/breinco.com\/wp-content\/uploads\/2021\/02\/isla-de-calor.jpg\" alt=\"Heat island created due to the urbanization of the territory\" width=\"639\" height=\"451\" \/><figcaption id=\"caption-attachment-2327\" class=\"wp-caption-text\">Urban heat island<\/figcaption><\/figure>\u00a0 &nbsp;\u00a0 To this end, a series of measures to be considered in the project are designated. From these measures, we extract below those that affect the color selection of pavements: <\/p>\n<p style=\"text-align: center;\"><strong><em>Use paving materials with an initial solar reflectance (SR) value of at least 0.33.<\/em><\/strong><\/p>\n<p> In the description of the classification process, it is detailed that either the SRI (Solar Reflectance Index) or SR (Solar Reflectance) value can be used alternatively for scoring calculations. <\/p>\n<h2><\/h2>\n<h2><strong>What SRI &amp; SR values are obtained in the testing of BREINCO materials?<\/strong><\/h2>\n<p> At Breinco, we have tested some of our paving materials in the TECNALIA and APPLUS laboratories, specifically the colors White Est\u00e1ndar, Listomat Snow White, and Listomat Terra Beige. The values obtained meet LEED requirements. <\/p>\n<p style=\"text-align: left;\"><strong> <\/strong><\/p>\n<p style=\"text-align: center;\"><strong>COLOR WHITE\u00a0 BREINCO<\/strong><\/p>\n<p style=\"text-align: center;\">Solar Reflectance (SR) = 0.42<\/p>\n<p style=\"text-align: center;\">Thermal Emissivity = 0.97<\/p>\n<p style=\"text-align: center;\"><strong>(SRI) <\/strong>(Solar Reflectance Index) = <strong>51.6<\/strong><\/p>\n<p> &nbsp;\u00a0 SR only deals with solar reflectance without delving deeper into the thermodynamic behavior of the material. In this case, <strong>58 is absorbed and 42 is reflected.<\/strong>\u00a0 SRI changes the value because it also takes into account the ability to emit heat, and the emissivity of the material is also factored in, which does not depend solely on heat.\u00a0 This distinction is made based on the architectural element we are considering: <\/p>\n<ul>\u00a0 \t<\/p>\n<li>In the case of a building roof where there is occupied space underneath, it is relevant to consider the SRI because it is not only important for the radiation to bounce off, but it is also crucial that the spaces below do not overheat. That is why we also consider the emissivity component.<\/li>\n<p>\u00a0 \t<\/p>\n<li>In the case of an urban development, a garden, or something completely outdoors without contact with a habitable space, we will only consider the SR and we will only assess how much radiation remains absorbed and how much is reflected.<\/li>\n<\/ul>\n<figure id=\"attachment_2330\" aria-describedby=\"caption-attachment-2330\" style=\"width: 652px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-2330\" title=\"Llosa Petra\" src=\"https:\/\/breinco.com\/wp-content\/uploads\/2021\/02\/Llosa-petra-taco-square-white-soto-lezkairu-pamplona-scaled.jpg\" alt=\"Llosa petra paver by Breinco in White color in Pamplona\" width=\"652\" height=\"371\" \/><figcaption id=\"caption-attachment-2330\" class=\"wp-caption-text\"><a href=\"https:\/\/www.breinco.com\/es\/pavimentos-de-exterior\/adoquines\/programa-petra\/?medida=2\">Llosa petra<\/a> White color in Pamplona<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><strong>COLOR SNOW WHITE<\/strong><\/p>\n<p style=\"text-align: center;\">Solar Reflectance (SR) = 0.56<\/p>\n<p style=\"text-align: center;\">Thermal Emissivity = 0.92<\/p>\n<p style=\"text-align: center;\"><strong>(SRI)<\/strong> (Solar Reflectance Index) = <strong>66<\/strong><\/p>\n<figure id=\"attachment_2340\" aria-describedby=\"caption-attachment-2340\" style=\"width: 638px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2340\" title=\"Listomat pavement in Snow White color\" src=\"https:\/\/breinco.com\/wp-content\/uploads\/2021\/02\/BRE_XXSS-Image-LISTOMAT4-scaled.jpg\" alt=\"Listomat pavement by Breinco in Snow White color\" width=\"638\" height=\"351\" \/><figcaption id=\"caption-attachment-2340\" class=\"wp-caption-text\"><a href=\"https:\/\/www.breinco.com\/es\/listomat\/\">Listomat<\/a> Snow White color<\/figcaption><\/figure>\n<p style=\"text-align: center;\"><strong>COLOR TERRA BEIGE<\/strong><\/p>\n<p style=\"text-align: center;\">Solar Reflectance (SR) = 0.31<\/p>\n<p style=\"text-align: center;\">Thermal Emissivity = 0.91<\/p>\n<p style=\"text-align: center;\">Solar Reflectance Index (SRI) = <strong>34<\/strong><\/p>\n<figure id=\"attachment_2328\" aria-describedby=\"caption-attachment-2328\" style=\"width: 643px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2328\" title=\"Listomat Pavement in Terra Beige Color\" src=\"https:\/\/breinco.com\/wp-content\/uploads\/2021\/02\/Breinco_Listomat_RRSS8.jpg\" alt=\"Listomat Pavement in Terra Beige Color\" width=\"643\" height=\"381\" \/><figcaption id=\"caption-attachment-2328\" class=\"wp-caption-text\"><a href=\"https:\/\/www.breinco.com\/es\/listomat\/\">Listomat<\/a> Terra Beige Color<\/figcaption><\/figure>\n<h2>References:<\/h2>\n<ul>\u00a0 \t<\/p>\n<li><a href=\"https:\/\/www.breinco.com\/breincosmartblog\/canopia-nuevo-color-glories\/\">Breinco Smart Blog (A new color for the Gl\u00f2ries pavement: Can\u00f2pia)<\/a>\n<p class=\"bh-article-title\">\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>With a correct choice of materials and their shades, it is possible to minimize the effects on microclimates and human and wildlife habitats by reducing heat islands.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1098],"tags":[1612,1613,1614,1615],"class_list":["post-24101","post","type-post","status-publish","format-standard","hentry","category-corporative","tag-isla-de-calor","tag-reflectancia-solar","tag-solar-reflectance-index","tag-sri"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - 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