Freezing and thawing of halibut were studied experimentally and computerized thermodynamics (CFD) models. Whole pallets of semi-frozen halibut were placed in a cold store and the air temperature and halibut temperature in different places on the pallet were measured by 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 pallets. 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. The 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 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. \u20105 \u00b0 C. At such a long temperature load, the temperature in pallet bags rose from -22.5 \u00b0 C to from -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
Freezing and thawing of Greenland halibut was investigated with experiments and computational fluid dynamics (CFD) models. A whole pallet of half \u2010 frozen halibut was put in a frozen storage and ambient temperature and fish temperature at different locations in the stack monitored. The required freezing time from \u201010 - \u20105 \u00b0 C down to \u201015 \u00b0 C was one to four days depending on the location within the stack. In the thawing experiments, both single, free standing halibut bags and twenty halibut bags stacked on a pallet, were investigated in an air climate chamber. The warm up of full \u2010 frozen product was mapped under typical temperature conditions during unloading of products from freezer trawlers, ie at 10 - 20 \u00b0 C ambient temperature. A good comparison between the CFD simulation and experimental results was obtained. Fish temperature increased from \u201026 \u00b0 C to - 5 \u00b0 C inside single bags when thermally loaded for 10 hours at 12.6 \u00b0 C ambient temperature. Equally long temperature abuse for the whole pallet, initially at \u201022.5 \u00b0 C, resulted in a very inhomogeneous temperature distribution from \u201017 to \u20103 \u00b0 C. The results from the CFD modeling showed that 10 m \/ s wind during unloading seriously accelerates thawing of frozen fish.<\/p>","protected":false},"excerpt":{"rendered":"
Frysting og \u00fe\u00ed\u00f0ing gr\u00e1l\u00fa\u00f0u \u2013 tilraunir og CFD hermun \/ Freezing and thawing of Greenland halibut \u2013 experiments and CFD […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[1615,1616,763,529,1617,1618,1361,368,1619,372],"class_list":["post-32238","post","type-post","status-publish","format-standard","hentry","category-skyrsla","tag-cfd-hermun","tag-cfd-simulation","tag-freezing","tag-frysting","tag-graluda","tag-halibut","tag-hitaalag","tag-thawing","tag-thermal-load","tag-thiding"],"acf":[],"yoast_head":"\n