{"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 – Solar calculator, Solar BC boundary conditions"},"content":{"rendered":"

<p class=”MsoNormal” style=”text-align: justify;”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>I have a skylight for roof top modeled with two different materials<\/span><\/p><p class=”MsoListParagraphCxSpFirst” style=”text-align: justify; text-indent: -18.0pt; mso-list: l0 level1 lfo1;”><!– [if !supportLists]–><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-fareast-font-family: ‘Aptos Display’; mso-fareast-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-bidi-font-family: ‘Aptos Display’; mso-bidi-theme-font: major-latin; mso-ansi-language: EN-US;”><span style=”mso-list: Ignore;”>1.<span style=”font: 7.0pt ‘Times New Roman’;”>       <\/span><\/span><\/span><!–[endif]–><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”><span style=”mso-spacerun: yes;”> <\/span>regular window glass which is opaque for longwave radiation. <\/span><\/p><p class=”MsoListParagraphCxSpLast” style=”text-align: justify; text-indent: -18.0pt; mso-list: l0 level1 lfo1;”><!– [if !supportLists]–><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-fareast-font-family: ‘Aptos Display’; mso-fareast-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-bidi-font-family: ‘Aptos Display’; mso-bidi-theme-font: major-latin; mso-ansi-language: EN-US;”><span style=”mso-list: Ignore;”>2.<span style=”font: 7.0pt ‘Times New Roman’;”>       <\/span><\/span><\/span><!–[endif]–><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>ZnS glass is 75% (0.75) transparent to the longwave radiation. <\/span><\/p><p class=”MsoNormal” style=”text-align: justify;”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;”>I used Discrete Ordinates (DO) Model since it is the only model with ‘semi-transparent’ and ‘non-gray’ mode.<\/span><span style=”mso-spacerun: yes;”>  <\/span><\/p><p class=”MsoNormal” style=”text-align: justify;”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;”>I made four bands, 0 – 4, 4 – 8, 8-14, 14-50 µm in Model – Radiation – Number of Bands,<\/span><\/p><p class=”MsoNormal” style=”text-align: justify;”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;”>Lets assume that : <\/span><\/p><p class=”MsoNormal” style=”text-align: justify;”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;”>Topside window glass and top side ZnS glass are exposed to ambient surroundings at 296 K<\/span><\/p><p class=”MsoNormal” style=”text-align: justify;”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; color: black; background: #FBFBFB; mso-ansi-language: EN-US;”>bottom side window glass and bottom side ZnS glass are located inside building space at 298 K<\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Now, I turned on solar calculator, <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Input the data such as Latitude, longitude and time and data, (this is fine). <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Direct solar <span style=”mso-spacerun: yes;”> <\/span>irradiation as 660 W\/m<sup>2<\/sup> <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Diffuse solar irradiation as 125 W\/m<sup>2<\/sup><\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Then, I turned on solar BC options for both top side window glass and top side ZnS glass. <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Direct and diffuse irradiation values are directly calculated by Ansys Fluent, <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>I think, Diffuse fraction = Diffuse irradiation\/(direct irradiation + diffuse irradiation). <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Now, the question is: <\/span><\/strong><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>For bottom side window glass, for bottom side ZnS glass, I want to set <\/span><\/strong><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Direct irradiation = ? Perhaps it is zero in all bands´(1 to 4)<\/span><\/strong><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Diffuse irradiations = band 1 to band 4 = (need help here). <\/span><\/strong><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Diffuse fraction= band 1 to band 4 = (need help here). <span style=”mso-spacerun: yes;”> <\/span><\/span><\/strong><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”>Please find the attached screen shots for better idea. <\/span><\/p><p class=”MsoNormal”><span lang=”EN-US” style=”font-family: ‘Aptos Display’,sans-serif; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;”> <\/span><\/strong><\/p><p class=”MsoNormal”><\/p><\/p>\n","protected":false},"template":"","class_list":["post-390093","topic","type-topic","status-answered","hentry","topic-tag-fluent-ansys-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["19394","62293"],"_bbp_author_ip":["130.232.83.188"],"_btv_view_count":["392"],"_bbp_topic_status":["answered"],"_bbp_likes_count":["1"],"_bbp_topic_id":["390093"],"_bbp_forum_id":["27792"],"_bbp_engagement":["19394","62293"],"_bbp_voice_count":["2"],"_bbp_last_reply_id":["395162"],"_bbp_last_active_id":["395162"],"_bbp_last_active_time":["2024-11-25 11:14:08"]},"test":"gopalakrishna-gangisettyabo-fi"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390093","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390093\/revisions"}],"predecessor-version":[{"id":391416,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/390093\/revisions\/391416"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=390093"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}