{"id":395,"date":"2023-10-19T13:22:41","date_gmt":"2023-10-19T13:22:41","guid":{"rendered":"https:\/\/uneedtalk.com\/config\/tredword\/?page_id=395"},"modified":"2023-12-01T13:01:52","modified_gmt":"2023-12-01T13:01:52","slug":"limitations-of-approaches-in-international-standards","status":"publish","type":"page","link":"https:\/\/radi-cal.org\/method\/limitations-of-approaches-in-international-standards\/","title":{"rendered":"Limitations of approaches in international standards"},"content":{"rendered":"<div class=\"row\"  id=\"row-337496690\">\n<div class=\"col small-12 large-12\"  ><div class=\"col-inner\"  >\n<h1>Limitations of approaches in international standards<\/h1>\n<p>The proposed method for modelling the performance of glazings with or without shading devices is unsatisfactory. Significant deviations to real-world performance values have to be expected due to the following issues: <\/p>\n<ul>\n<li>global radiation propagating through the system is modelled as quasi-parallel, near-normal incidence only (ISO 9050, EN 410)<\/li>\n<li>in combination with a shading layer, ISO 15099 suggests considering an additional perfectly diffused radiation component but does not specify how glazings and coatings should be modelled accordingly.<\/li>\n<li>ISO 52022 suggests the consideration of a diffuse component for shading devices but feeds the calculation results back into the direct-normal radiation model.<\/li>\n<li>ISO 15099 and ISO 52022 provide calculation methods for shading devices only for the case of Venetian blinds.<\/li>\n<li>the Venetian blind model in both standards is oversimplified: perfectly flat, ideal diffusely reflecting, infinitely extended and infinitely thin slats are assumed. <\/li>\n<\/ul>\n<p>Many issues may be caused by the fact that the initial purpose of the international standards was to provide a transparent, neutral and objective performance measure for windows and shading systems. The assumed boundary conditions, therefore, rather reflect a lab-like environment that does not reflect real-world conditions, as required for building performance simulation.<\/p>\n<\/div><\/div>\n<\/div>\n<style>\n#menu-main li:nth-child(3) .sub-menu{display:block !important;}\n<\/style>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"page-right-sidebar.php","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/pages\/395"}],"collection":[{"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/comments?post=395"}],"version-history":[{"count":3,"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/pages\/395\/revisions"}],"predecessor-version":[{"id":1954,"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/pages\/395\/revisions\/1954"}],"wp:attachment":[{"href":"https:\/\/radi-cal.org\/method\/wp-json\/wp\/v2\/media?parent=395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}