{"id":43013,"date":"2009-11-09T09:51:00","date_gmt":"2009-11-09T09:51:00","guid":{"rendered":"https:\/\/matis.is\/?p=43013"},"modified":"2021-08-25T09:53:08","modified_gmt":"2021-08-25T09:53:08","slug":"varmaflutningslikan-af-graludu-frysting-og-thiding-taekifaeri-til-frekari-verdmaetaskopunar","status":"publish","type":"post","link":"https:\/\/matis.is\/en\/frettir\/varmaflutningslikan-af-graludu-frysting-og-thiding-taekifaeri-til-frekari-verdmaetaskopunar\/","title":{"rendered":"Heat transfer model of halibut, freezing and thawing - an opportunity for further value creation"},"content":{"rendered":"<h4 class=\"wp-block-heading\">The Mat\u00eds report &quot;Freezing and thawing of halibut - experiments and CFD simulation&quot; has been published, which was prepared in the project Simulation of cooling processes.&nbsp;<\/h4>\n\n\n\n<p>The freezing and thawing of halibut was experimentally studied and CFD models were constructed using the thermal and hydrological software FLUENT. The project has already demonstrated the unequivocal utility of such models for the transport processes of fresh produce, but the results of this report show that the same applies to frozen products.&nbsp;<\/p>\n\n\n\n<p>In the freezing experiment, whole pallets of semi-frozen halibut were placed in a cold store and the air temperature and the temperature of halibut in different places on the pallet were measured with thermometers. The time taken for the halibut to freeze from -10 to -5 \u00b0 C below -15 \u00b0 C ranged from one to four days depending on the location of the pallet.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/gamla.matis.is\/media\/ljosmyndir\/grein\/Varmaflutningslikan_graludu_3_nov_2009-2.jpg\" alt=\"Varmaflutningslikan_graludu_3_nov_2009-2\"\/><figcaption>Heat distribution in the horizontal plane in the middle<br>height in a single halibut bag after 10 hours. heat load (12.6 \u00b0 C ambient temperature) according to CFD model. The initial product temperature was -26.0 \u00b0 C<\/figcaption><\/figure>\n\n\n\n<p>In thawing experiments, both individual bags and twenty bags, stacked on pallets, were examined in the temperature-controlled cold rooms of Mat\u00eds and UI. Heating of a frozen product was mapped under conditions that may occur during unloading from freezer trawlers or 10 - 20 \u00b0 C air temperature. The results of the experiments were compared with the results of three-dimensional heat transfer models, and there was generally a good agreement between them. At 10 p.m. storage at 12.6 \u00b0 C air temperature raised the temperature in individual bags from about -26 \u00b0 C to approx. -5 \u00b0 C. At such a long temperature load, the temperature in pallet bags rose from -22.5 \u00b0 C to -17 to -3 \u00b0 C, which shows how homogeneous the heat distribution can be with prolonged heat load. The results of the CFD model showed that 10 m \/ s wind during loading significantly accelerates the thawing of frozen fish on pallets.<\/p>\n\n\n\n<p>For further information, please contact Bj\u00f6rn Margeirsson, PhD student at Mat\u00eds and the University of Iceland,&nbsp;<a href=\"mailto:bjorn.margeirsson@matis.is\">bjorn.margeirsson@matis.is<\/a>.&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Komin er \u00fat Mat\u00eds sk\u00fdrslan \u201eFrysting og \u00fe\u00ed\u00f0ing gr\u00e1l\u00fa\u00f0u \u2013 tilraunir og CFD hermun\u201c, sem unnin var \u00ed verkefninu Hermun [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":43014,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"templates\/template-cover.php","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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