{"id":41000,"date":"2025-02-21T09:44:06","date_gmt":"2025-02-21T08:44:06","guid":{"rendered":"https:\/\/biblus.accasoftware.com\/en\/?p=41000"},"modified":"2025-02-21T09:44:06","modified_gmt":"2025-02-21T08:44:06","slug":"solar-factor-what-it-is-and-how-to-calculate-it","status":"publish","type":"post","link":"https:\/\/biblus.accasoftware.com\/en\/solar-factor-what-it-is-and-how-to-calculate-it\/","title":{"rendered":"Solar Factor: What It Is and How to Calculate It"},"content":{"rendered":"<p class=\"sommario\">The solar factor indicates the amount of heat that can enter an environment. Discover why it is important in the choice of glass<\/p>\n<p><!--more--><\/p>\n<p>Window glass is not just an element that separates the inside from the outside, but it is a fundamental component that can influence thermal insulation, natural lighting, and consequently, living comfort. Choosing the right glass can help reduce energy costs, improve thermal efficiency, and optimize the intake of natural light.<\/p>\n<p>To understand the performance of glass, there are parameters to consider such as the <strong>solar factor<\/strong> and <strong>light transmission<\/strong> (<strong>TL<\/strong>). The solar factor helps us understand how much solar energy passes through the glass surface. Light transmission, on the other hand, represents the amount of light that the glass of a fixture allows to filter inside.<\/p>\n<p>The solar factor is a determining parameter in the design of a building, especially when the environments have large transparent surfaces, as it is able to <strong>quantify the heat that enters the internal environments<\/strong>. Therefore, it is an important value in the choice of frames and windows as it influences comfort and energy savings within buildings.<\/p>\n<h2 id=\"solar-factor-and-glass\">Solar factor and glass<\/h2>\n<p>To understand what the solar factor indicates, one must first know what happens when solar radiation hits a glass.<\/p>\n<p>Glass, by its nature, is considered transparent to light, but it is only partially transparent to solar radiation. When a ray of sunlight hits a glass surface, the following phenomena occur:<\/p>\n<ul>\n<li><strong>reflection<\/strong>: part of the total incident solar radiation is reflected by the glass;<\/li>\n<li><strong>transmission<\/strong>: part of the total incident solar radiation passes through the glass;<\/li>\n<li><strong>absorption<\/strong>: part of the solar radiation is absorbed by the glass;<\/li>\n<li><strong>emission<\/strong>: part of the incident solar radiation absorbed by the glass is gradually released into the surrounding environment.<\/li>\n<\/ul>\n<p>The measured values for each of these phenomena, which are interrelated, determine the so-called <strong>solar gain<\/strong> or <strong>solar transmission<\/strong>, indicated by the parameter <strong>g<\/strong>.<\/p>\n<p>This value, which ranges from 0 to 1, indicates the ratio between the amount of solar radiation transmitted inside the building and the total radiation incident on the outer surface of the glass.<\/p>\n<p>A value tending to <strong>zero<\/strong> indicates a <strong>lower capacity of the glass for solar transmission<\/strong>, while a value close to <strong>one<\/strong> indicates a <strong>high transmission capacity<\/strong>.<\/p>\n<h2 id=\"what-is-the-solar-factor\">What is the solar factor<\/h2>\n<p>The <strong>solar factor<\/strong>, also known as the <strong>solar energy gain coefficient<\/strong> or total energy transmission, is a value that measures the amount of solar energy that can pass through a glass element. It is therefore able to quantify the heat that enters the internal environments and is of great importance in determining the <strong>overall energy balance<\/strong>.<\/p>\n<p>In the <strong>winter months<\/strong>, in fact, free solar gains positively contribute to reducing the energy demand for heating. Conversely, in the <strong>summer season<\/strong>, if not properly considered during the design phase or during the choice of glazing products for construction, they can create overheating problems, particularly for Mediterranean countries.<\/p>\n<p>The <strong>solar factor g<\/strong> of a glass surface, therefore, <strong>represents the percentage of thermal energy, \u03c4<sub>e<\/sub>, that directly passes through the pane compared to the total incident energy.<\/strong> It is an index expressed as a percentage % and is useful for evaluating the energy performance of a glass element.<\/p>\n<p>The value of this parameter can vary greatly, ranging from a minimum of 0.1 to a maximum of 0.9 (10% \u2013 90%).<\/p>\n<p>In the case of <strong>single glass<\/strong>, <em>g<\/em> coincides with <em>\u03c4<sub>e<\/sub><\/em>:<\/p>\n<p style=\"text-align: center;\"><strong>g = \u03c4<sub>e<\/sub><\/strong><\/p>\n<p>In the case of <strong>insulating glass<\/strong>, the solar factor takes into account an additional contribution, q<sub>i<\/sub>, from the radiation reflected and transmitted by the double glazing towards the inside. Thus, the solar factor is equal to:<\/p>\n<p style=\"text-align: center;\"><strong>g = \u03c4<sub>e<\/sub> + q<sub>i <\/sub><\/strong><\/p>\n<h2 id=\"what-is-the-difference-between-solar-factor-thermal-transmittance-and-light-transmittance\">What is the difference between solar factor, thermal transmittance, and light transmittance<\/h2>\n<p>The main values in the choice of glass are thermal transmittance, light transmittance, and the solar factor.<\/p>\n<p>The <strong>solar factor<\/strong> g is the ratio between the solar energy that manages to pass through the glass entering the environment and the total solar energy that strikes the outer surface of the glazing. It is expressed as a percentage % and is useful for evaluating the energy performance of a glass element.<\/p>\n<p>Thermal transmittance U is the amount of heat that passes from a heated environment to a cold environment through a given surface. It measures the efficiency with which a material resists the passage of heat and primarily answers two questions: <strong>how much heat does a building retain<\/strong> and <strong>how much does it lose<\/strong>. The unit of measurement for thermal transmittance is W\/m<sup>2<\/sup>K, Watts per square meter per Kelvin.<\/p>\n<p>The <strong>light transmittance<\/strong> (TL) expresses the amount of light transmitted through the glass. It is the percentage of light, visible to our eyes, that the glass of a fixture allows to filter into the internal environment. The higher the % value, the more the room will be naturally lit, saving on the use of artificial light sources.<\/p>\n<p>&nbsp;<\/p>\n<div class=\"international-product-banner-desktop\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/en\/dynamic-energy-analysis-and-simulation-software\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/termus-plus-en.jpg\" alt=\"termus-plus\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto\/termus-plus-en.jpg\" alt=\"termus-plus\" \/><\/noscript><\/a><\/div>\n<div>\n<div class=\"international-product-banner-mobile\" style=\"text-align: center;\"><a class=\"product-banner-link\" href=\"https:\/\/www.accasoftware.com\/en\/dynamic-energy-analysis-and-simulation-software\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" class=\"lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAIAAAAAAAP\/\/\/yH5BAEAAAAALAAAAAABAAEAAAIBRAA7\" data-src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/termus-plus-en.jpg\" alt=\"termus-plus\" \/><noscript><img decoding=\"async\" class=\"lazyload\" src=\"\/wp-content\/themes\/enfold-child\/img\/banner_prodotto_mobile\/termus-plus-en.jpg\" alt=\"termus-plus\" \/><\/noscript><\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The solar factor indicates the amount of heat that can enter an environment. Discover why it is important in the choice of glass<\/p>\n","protected":false},"author":54,"featured_media":41002,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_data_scadenza_evento":"","_evento_nome":"","_evento_data":"","_evento_luogo":"","_evento_cta":"","keyword_en":"solar factor","keyword_es":"","keyword_fr":"","keyword_de":"","keyword_ptb":"","_note_content":"<table dir=\"ltr\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\" data-sheets-root=\"1\" data-sheets-baot=\"1\"><colgroup><col width=\"42\" \/><col width=\"543\" \/><col width=\"93\" \/><\/colgroup>\r\n<tbody>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>solar factor<\/td>\r\n<td>30<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor formula solar<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor of solar energy<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor of solar panels<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor of solar power plant<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor of solar pv<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor of solar pv panels<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor solar calculation<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor solar formula<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>capacity factor solar panels<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>factor solar<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>EN<\/td>\r\n<td>factors affecting solar radiation<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur solaire<\/td>\r\n<td>390<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur solaire vitrage<\/td>\r\n<td>260<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>vitrage facteur solaire<\/td>\r\n<td>140<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur de charge solaire<\/td>\r\n<td>50<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur solaire g<\/td>\r\n<td>50<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur solaire g et sw<\/td>\r\n<td>40<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>sw facteur solaire<\/td>\r\n<td>40<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur solaire fenetre<\/td>\r\n<td>30<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>calcul facteur solaire<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur de charge panneau solaire<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur de concentration solaire<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>FR<\/td>\r\n<td>facteur de protection solaire<\/td>\r\n<td>20<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>PTB<\/td>\r\n<td>Fatores solares<\/td>\r\n<td>110<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>ES<\/td>\r\n<td>factor solar<\/td>\r\n<td>210<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>ES<\/td>\r\n<td>factor solar vidrio<\/td>\r\n<td>170<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>ES<\/td>\r\n<td>factor solar del vidrio<\/td>\r\n<td>70<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>ES<\/td>\r\n<td>factor solar g<\/td>\r\n<td>40<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>DE<\/td>\r\n<td>Solarer Gewinnfaktor<\/td>\r\n<td>0<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>","footnotes":""},"categories":[5081],"tags":[5197],"class_list":["post-41000","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bim-energy","tag-newsletter-381"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.8 (Yoast SEO v28.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Solar Factor: What It Is and How to Calculate It - BibLus<\/title>\n<meta name=\"description\" content=\"The solar factor indicates the amount of heat that can enter an environment. 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