{"id":215,"date":"2025-12-15T03:39:49","date_gmt":"2025-12-15T03:39:49","guid":{"rendered":"https:\/\/fair-msc-project.eu\/?p=215"},"modified":"2025-12-15T03:39:49","modified_gmt":"2025-12-15T03:39:49","slug":"non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa","status":"publish","type":"post","link":"https:\/\/fair-msc-project.eu\/zu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/","title":{"rendered":"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa"},"content":{"rendered":"<section class=\"wpb-content-wrapper\"><div class=\"vc_row wpb_row vc_row-fluid\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_text_column wpb_content_element\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p><strong>Authors:\u00a0<\/strong> <span class=\"TextRun SCXW232602418 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW232602418 BCX0\">Tamara Rosemary Govindasamy; and Naven Chetty<\/span><\/span><span class=\"EOP SCXW232602418 BCX0\" data-ccp-props=\"{&quot;335551550&quot;:6,&quot;335551620&quot;:6}\">\u00a0<\/span><\/p>\n<p><strong>Date:\u00a0 <\/strong><span class=\"TextRun SCXW250701413 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW250701413 BCX0\">16 May 2019<\/span><\/span><\/p>\n<p><strong>Short Description:\u00a0 <\/strong><span class=\"TextRun SCXW13051284 BCX0\" lang=\"EN-US\" xml:lang=\"EN-US\" data-contrast=\"auto\"><span class=\"NormalTextRun SCXW13051284 BCX0\">South Africa continues to lag globally in the adoption of renewable energy systems despite a notable decrease in the cost of applicable renewable energy technologies over the past five years. Most applications of potential solar renewable energy systems are currently in various stages of investigation, leaving this readily accessible resource capacity idle. The present study proposes linear and non-linear analysis of multivariate models for estimating global solar radiation (GSR) received across five cities in South Africa. The significance of this study is to provide effective GSR estimation in the application of solar technologies, while increasing their implementation. The dependency of GSR on meteorological variables such as air temperature, relative humidity and relative sunshine duration was evaluated\u00a0<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">for<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0January 2007 to June 2018 to\u00a0<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW13051284 BCX0\">realise<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0estimation models for each of the study sites. The Hargreaves-Samani and Angstrom-Prescott empirical models served as the basis for single variable analysis of GSR reliance on each meteorological parameter and their relative variations.\u00a0<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">The results indicated that the proposed non-linear, multivariate equations perform better than the empirical models as well as linear, single variable regression equations.<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0The suggested models are site-specific and\u00a0<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">demonstrate<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0a strong correlation to historic GSR values with low, acceptable error indicators. It was also\u00a0<\/span><span class=\"NormalTextRun SpellingErrorV2Themed SCXW13051284 BCX0\">recognised<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0that second- and third-order relationships between the clearness index and multiple meteorological variables provide a more\u00a0<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">accurate<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0description of GSR for most of the cities under study. These methods are cost-effective, easily\u00a0<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">accessible<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0and\u00a0<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">appropriate for<\/span><span class=\"NormalTextRun SCXW13051284 BCX0\">\u00a0the evaluation of the feasibility of solar photovoltaic technologies in South Africa.<\/span><\/span><\/p>\n<p><strong>External Link:\u00a0 <\/strong><a href=\"https:\/\/doi.org\/10.17159\/2413-3051\/2019\/v30i2a6076\" target=\"_blank\" rel=\"noopener\">Click here.<\/a><\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t<div class=\"wpb_raw_code wpb_content_element wpb_raw_html\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<div style=\"display:flex; flex-direction:column; align-items:center; justify-content:center; width:100%; margin:20px 0;\">\n  <!-- PDF Embed -->\n  <object data=\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.pdf\" \n          style=\"width:80%; max-width:800px; height:600px; border:1px solid #ccc; border-radius:8px;\"\n          aria-label=\"PDF embed\">\n    <p>Your browser does not support PDFs. \n       <a href=\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.pdf\" style=\"color:#1e4494; text-decoration:underline;\">Download the PDF<\/a> instead.\n    <\/p>\n  <\/object>\n\n  <!-- Download Button -->\n  <a href=\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.pdf\" download style=\"display:inline-block; background-color:#1e4494; color:#ffffff;             padding:12px 28px; border-radius:50px; text-decoration:none;             font-weight:600; font-family:Arial, sans-serif;             margin-top:20px; transition:background-color 0.3s ease; text-align:center;\">\n    Download\n  <\/a>\n<\/div>\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n<\/section>","protected":false},"excerpt":{"rendered":"Authors:\u00a0 Tamara Rosemary Govindasamy; and Naven Chetty\u00a0","protected":false},"author":1,"featured_media":163,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-215","post","type-post","status-publish","format-standard","hentry","category-thematic-pillars-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa | Fair<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fair-msc-project.eu\/zu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa | Fair\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fair-msc-project.eu\/zu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\" \/>\n<meta property=\"og:site_name\" content=\"Fair\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-15T03:39:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png\" \/>\n\t<meta property=\"og:image:width\" content=\"2481\" \/>\n\t<meta property=\"og:image:height\" content=\"3509\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\/\/fair-msc-project.eu\/#\/schema\/person\/567e1c7f75306188ddcde30d879c8084\"},\"headline\":\"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa\",\"datePublished\":\"2025-12-15T03:39:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\"},\"wordCount\":438,\"image\":{\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png\",\"articleSection\":[\"Thematic Pillar 2\"],\"inLanguage\":\"zu\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\",\"url\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\",\"name\":\"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa | Fair\",\"isPartOf\":{\"@id\":\"https:\/\/fair-msc-project.eu\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png\",\"datePublished\":\"2025-12-15T03:39:49+00:00\",\"author\":{\"@id\":\"https:\/\/fair-msc-project.eu\/#\/schema\/person\/567e1c7f75306188ddcde30d879c8084\"},\"breadcrumb\":{\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#breadcrumb\"},\"inLanguage\":\"zu\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"zu\",\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage\",\"url\":\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png\",\"contentUrl\":\"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png\",\"width\":2481,\"height\":3509,\"caption\":\"42\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/fair-msc-project.eu\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/fair-msc-project.eu\/#website\",\"url\":\"https:\/\/fair-msc-project.eu\/\",\"name\":\"Fair\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/fair-msc-project.eu\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"zu\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/fair-msc-project.eu\/#\/schema\/person\/567e1c7f75306188ddcde30d879c8084\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zu\",\"@id\":\"https:\/\/fair-msc-project.eu\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/9f3813c15483ae184d0ab59b95d231bdf6625b9084abf6a14272f373cf4bad1d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/9f3813c15483ae184d0ab59b95d231bdf6625b9084abf6a14272f373cf4bad1d?s=96&d=mm&r=g\",\"caption\":\"admin\"},\"sameAs\":[\"https:\/\/fair-msc-project.eu\"],\"url\":\"https:\/\/fair-msc-project.eu\/zu\/author\/fairwpadmn\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa | Fair","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/fair-msc-project.eu\/zu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/","og_locale":"en_US","og_type":"article","og_title":"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa | Fair","og_url":"https:\/\/fair-msc-project.eu\/zu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/","og_site_name":"Fair","article_published_time":"2025-12-15T03:39:49+00:00","og_image":[{"width":2481,"height":3509,"url":"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png","type":"image\/png"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"Written by":"admin","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#article","isPartOf":{"@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/"},"author":{"name":"admin","@id":"https:\/\/fair-msc-project.eu\/#\/schema\/person\/567e1c7f75306188ddcde30d879c8084"},"headline":"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa","datePublished":"2025-12-15T03:39:49+00:00","mainEntityOfPage":{"@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/"},"wordCount":438,"image":{"@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage"},"thumbnailUrl":"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png","articleSection":["Thematic Pillar 2"],"inLanguage":"zu"},{"@type":"WebPage","@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/","url":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/","name":"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa | Fair","isPartOf":{"@id":"https:\/\/fair-msc-project.eu\/#website"},"primaryImageOfPage":{"@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage"},"image":{"@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage"},"thumbnailUrl":"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png","datePublished":"2025-12-15T03:39:49+00:00","author":{"@id":"https:\/\/fair-msc-project.eu\/#\/schema\/person\/567e1c7f75306188ddcde30d879c8084"},"breadcrumb":{"@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#breadcrumb"},"inLanguage":"zu","potentialAction":[{"@type":"ReadAction","target":["https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/"]}]},{"@type":"ImageObject","inLanguage":"zu","@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#primaryimage","url":"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png","contentUrl":"https:\/\/fair-msc-project.eu\/wp-content\/uploads\/2025\/12\/42.png","width":2481,"height":3509,"caption":"42"},{"@type":"BreadcrumbList","@id":"https:\/\/fair-msc-project.eu\/non-linear-multivariate-models-for-estimating-global-solar-radiation-received-across-five-cities-in-south-africa\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/fair-msc-project.eu\/"},{"@type":"ListItem","position":2,"name":"Non-linear multivariate models for estimating global solar radiation received across five cities in South Africa"}]},{"@type":"WebSite","@id":"https:\/\/fair-msc-project.eu\/#website","url":"https:\/\/fair-msc-project.eu\/","name":"Fair","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/fair-msc-project.eu\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"zu"},{"@type":"Person","@id":"https:\/\/fair-msc-project.eu\/#\/schema\/person\/567e1c7f75306188ddcde30d879c8084","name":"admin","image":{"@type":"ImageObject","inLanguage":"zu","@id":"https:\/\/fair-msc-project.eu\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/9f3813c15483ae184d0ab59b95d231bdf6625b9084abf6a14272f373cf4bad1d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9f3813c15483ae184d0ab59b95d231bdf6625b9084abf6a14272f373cf4bad1d?s=96&d=mm&r=g","caption":"admin"},"sameAs":["https:\/\/fair-msc-project.eu"],"url":"https:\/\/fair-msc-project.eu\/zu\/author\/fairwpadmn\/"}]}},"_links":{"self":[{"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/posts\/215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/comments?post=215"}],"version-history":[{"count":0,"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/posts\/215\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/media\/163"}],"wp:attachment":[{"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/media?parent=215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/categories?post=215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fair-msc-project.eu\/zu\/wp-json\/wp\/v2\/tags?post=215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}