{"id":390093,"date":"2024-10-16T16:51:22","date_gmt":"2024-10-16T16:51:22","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-needed-solar-calculator-solar-bc-boundary-conditions\/"},"modified":"2024-10-25T17:05:07","modified_gmt":"2024-10-25T17:05:07","slug":"help-needed-solar-calculator-solar-bc-boundary-conditions","status":"answered","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-needed-solar-calculator-solar-bc-boundary-conditions\/","title":{"rendered":"Help needed &#8211; Solar calculator, Solar BC boundary conditions"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;I have a skylight for roof top modeled with two different materials&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoListParagraphCxSpFirst&#8221; style=&#8221;text-align: justify; text-indent: -18.0pt; mso-list: l0 level1 lfo1;&#8221;&gt;&lt;!&#8211; [if !supportLists]&#8211;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-fareast-font-family: &#8216;Aptos Display&#8217;; mso-fareast-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-bidi-font-family: &#8216;Aptos Display&#8217;; mso-bidi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;&lt;span style=&#8221;mso-list: Ignore;&#8221;&gt;1.&lt;span style=&#8221;font: 7.0pt &#8216;Times New Roman&#8217;;&#8221;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;!&#8211;[endif]&#8211;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp;&lt;\/span&gt;regular window glass which is opaque for longwave radiation. &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoListParagraphCxSpLast&#8221; style=&#8221;text-align: justify; text-indent: -18.0pt; mso-list: l0 level1 lfo1;&#8221;&gt;&lt;!&#8211; [if !supportLists]&#8211;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-fareast-font-family: &#8216;Aptos Display&#8217;; mso-fareast-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-bidi-font-family: &#8216;Aptos Display&#8217;; mso-bidi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;&lt;span style=&#8221;mso-list: Ignore;&#8221;&gt;2.&lt;span style=&#8221;font: 7.0pt &#8216;Times New Roman&#8217;;&#8221;&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;!&#8211;[endif]&#8211;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;ZnS glass is 75% (0.75) transparent to the longwave radiation. &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;&#8221;&gt;I used Discrete Ordinates (DO) Model since it is the only model with &#8216;semi-transparent&#8217; and &#8216;non-gray&#8217; mode.&lt;\/span&gt;&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;&#8221;&gt;I made four bands, 0 &ndash; 4, 4 &ndash; 8, 8-14, 14-50 &micro;m in Model &#8211; Radiation &#8211; Number of Bands,&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;&#8221;&gt;Lets assume that : &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;&#8221;&gt;Topside window glass and top side ZnS glass are exposed to ambient surroundings at 296 K&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;&#8221;&gt;bottom side window glass and bottom side ZnS glass are located inside building space at 298 K&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Now, I turned on solar calculator, &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Input the data such as Latitude, longitude and time and data, (this is fine). &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Direct solar &lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp;&lt;\/span&gt;irradiation as 660 W\/m&lt;sup&gt;2&lt;\/sup&gt; &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Diffuse solar irradiation as 125 W\/m&lt;sup&gt;2&lt;\/sup&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Then, I turned on solar BC options for both top side window glass and top side ZnS glass. &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Direct and diffuse irradiation values are directly calculated by Ansys Fluent, &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;I think, Diffuse fraction = Diffuse irradiation\/(direct irradiation + diffuse irradiation). &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<strong>&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Now, the question is: &lt;\/span&gt;<\/strong>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<strong>&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;For bottom side window glass, for bottom side ZnS glass, I want to set &lt;\/span&gt;<\/strong>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<strong>&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Direct irradiation = ? Perhaps it is zero in all bands&acute;(1 to 4)&lt;\/span&gt;<\/strong>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<strong>&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Diffuse irradiations = band 1 to band 4 = (need help here). &lt;\/span&gt;<\/strong>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<strong>&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Diffuse fraction= band 1 to band 4 = (need help here). &lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/span&gt;<\/strong>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;Please find the attached screen shots for better idea. &lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<strong>&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-family: &#8216;Aptos Display&#8217;,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;&#8221;&gt;&nbsp;&lt;\/span&gt;<\/strong><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/16-10-2024-1729097350-mceclip0.png\" \/>&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/16-10-2024-1729097434-mceclip2.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390093","topic","type-topic","status-answered","hentry","topic-tag-fluent-ansys-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I have a skylight for roof top modeled with two different materials\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/help-needed-solar-calculator-solar-bc-boundary-conditions\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Help needed \u2013 Solar calculator, Solar BC boundary conditions | Ansys Learning 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