{"id":2471,"date":"2018-10-19T12:01:00","date_gmt":"2018-10-19T10:01:00","guid":{"rendered":"https:\/\/www.ntnu.no\/blogger\/teknat\/?p=2471"},"modified":"2021-09-17T02:42:38","modified_gmt":"2021-09-17T00:42:38","slug":"towards-higher-energy-efficiency-in-the-power-and-process-industry","status":"publish","type":"post","link":"https:\/\/www.ntnu.no\/blogger\/teknat\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/","title":{"rendered":"Towards higher energy efficiency in the power and process industry"},"content":{"rendered":"\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.ntnutechzone.no\/wp-content\/uploads\/2018\/10\/power-plant-2411932_1920.jpg\" alt=\"Power plant\" \/><figcaption>Power plant (Illustration from Pixabay).<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">When you are boiling water for your coffee in the morning, you are observing how energy is wasted. Water is boiling at 100<sup>o<\/sup>C, but the surface of the kettle might be about 150<sup>o<\/sup>C. This waste of energy is because the heat transfer from the wall to the liquid is not an efficient process. Unfortunately, this problem is affecting us daily.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Energy is produced in power plants by boiling water, and part of the energy is wasted due to this inefficient heat transfer. The same is occurring in your refrigerator or in an air-conditioning system. A more complex issue affecting the efficiency of boiling systems is the occurrence of flow&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Oscillation\">oscillations<\/a>. This means variation in time of the&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Velocity\">velocity<\/a>&nbsp;of the flow due to a phenomenon called two-phase flow instabilities.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Under given conditions, the flow can show oscillations, because&nbsp;the velocity increases and decreases in time spontaneously, see Figure 1. This phenomenon has been observed and studied since the 50\u2019s as power plants all over the world were constructed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The occurrence of these oscillations has been attributed to seriously affect the efficient heat transfer in addition to the potential damage of the equipment. For this reason, the operation of the plant can be restrictive by the occurrence of these oscillations. However, when, how and why the oscillations are damaging&nbsp;to the heat transfer process are questions that have puzzled the research community for several decades.<\/p>\n\n\n\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.ntnutechzone.no\/wp-content\/uploads\/2018\/10\/Figur1blogg_carlos.png\" alt=\"Example of a self-sustained density wave oscillation obtained in the Two-phase flow instability facility at NTNU\" \/><figcaption>Figure 1. Example of a self-sustained density wave oscillation obtained in the Two-phase flow instability facility at NTNU.<br><a href=\"https:\/\/www.youtube.com\/watch?v=xoD9NLzFRcQ\">Click here to see a video of density wave oscillation<\/a>.<\/figcaption><\/figure><\/div>\n\n\n\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.ntnutechzone.no\/wp-content\/uploads\/2018\/10\/Two_phase_lab-300x225.jpg\" alt=\"The two-phase flow instability laboratory at EPT\" \/><figcaption>The two-phase flow instability laboratory at EPT.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The two-phase flow instability laboratory&nbsp;at our group allows us to revisit this old question by performing a well-controlled experimental study. Our recent results show that flow oscillations are damaging to the heat transfer&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Coefficient\">coefficient<\/a>&nbsp;but only if the&nbsp;<a href=\"https:\/\/en.wikipedia.org\/wiki\/Amplitude\">amplitude<\/a>&nbsp;of the oscillations are above a given value, see figure 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This new result suggests that the well-established assumption that flow oscillations can affect the heat transfer process need to be reconsidered.<\/p>\n\n\n\n<div class=\"wp-block-image is-style-default\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/www.ntnutechzone.no\/wp-content\/uploads\/2018\/10\/Figur2_bloggcarlos-1024x647.png\" alt=\"Oscillation diagrams\" \/><figcaption>Figure 2. Example of the new results. If the oscillation of the flow is small in amplitude no effect is observed in the heat transfer coefficient h, however for larger amplitudes the deterioration in the heat transfer coefficient h is remarkable.<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">The details of the study are available in this publication:<a href=\"https:\/\/aip.scitation.org\/doi\/10.1063\/1.5046429\">&nbsp;Applied Physics Letters, 113, 154102 (2018)<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator\" \/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Blog post originally published on <a href=\"https:\/\/www.ntnutechzone.no\/\">www.ntnutechzone.no<\/a> on October 19th, 2018<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you are boiling water for your coffee in the morning, you are observing how energy is wasted. Water is boiling at 100oC, but the surface of the kettle might be about 150oC. This waste of energy is because the heat transfer from the wall&#8230;<\/p>\n","protected":false},"author":473,"featured_media":2472,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[126,19],"tags":[448,132,538,540],"class_list":["post-2471","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-energy-en","category-engineering","tag-energy-en","tag-ept-en","tag-heat-transfer-en","tag-two-phase-facility-en"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Towards higher energy efficiency in the power and process industry - NTNU TekNat<\/title>\n<meta name=\"description\" content=\"Energy is produced in power plants by boiling water, and part of the energy is wasted due to this inefficient heat transfer. 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The same is occurring in your refrigerator or in an air-conditioning system. A more complex issue affecting the efficiency of boiling systems is the occurrence of flow oscillations. This means variation in time of the velocity of the flow due to a phenomenon called two-phase flow instabilities.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/\" \/>\n<meta property=\"og:site_name\" content=\"NTNU TekNat\" \/>\n<meta property=\"article:published_time\" content=\"2018-10-19T10:01:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-09-17T00:42:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/09\/power-plant-2411932_1920.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1279\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Gorm R\u00f8dder\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Skrevet av\" \/>\n\t<meta name=\"twitter:data1\" content=\"Gorm R\u00f8dder\" \/>\n\t<meta name=\"twitter:label2\" content=\"Ansl. lesetid\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutter\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/\"},\"author\":{\"name\":\"Gorm R\u00f8dder\",\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/#\\\/schema\\\/person\\\/eebdac823cfa66c759dc9640424c33ee\"},\"headline\":\"Towards higher energy efficiency in the power and process industry\",\"datePublished\":\"2018-10-19T10:01:00+00:00\",\"dateModified\":\"2021-09-17T00:42:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/\"},\"wordCount\":428,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/wp-content\\\/uploads\\\/sites\\\/65\\\/2021\\\/09\\\/power-plant-2411932_1920.jpg\",\"keywords\":[\"energy\",\"energy and process engineering\",\"heat transfer\",\"two-phase-facility\"],\"articleSection\":[\"Energy\",\"Engineering\"],\"inLanguage\":\"nb-NO\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/\",\"url\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/\",\"name\":\"Towards higher energy efficiency in the power and process industry - NTNU TekNat\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/en\\\/2018\\\/10\\\/19\\\/towards-higher-energy-efficiency-in-the-power-and-process-industry\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/wp-content\\\/uploads\\\/sites\\\/65\\\/2021\\\/09\\\/power-plant-2411932_1920.jpg\",\"datePublished\":\"2018-10-19T10:01:00+00:00\",\"dateModified\":\"2021-09-17T00:42:38+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.ntnu.no\\\/blogger\\\/teknat\\\/#\\\/schema\\\/person\\\/eebdac823cfa66c759dc9640424c33ee\"},\"description\":\"Energy is produced in power plants by boiling water, and part of the energy is wasted due to this inefficient heat transfer. 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This means variation in time of the velocity of the flow due to a phenomenon called two-phase flow instabilities.","og_url":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/","og_site_name":"NTNU TekNat","article_published_time":"2018-10-19T10:01:00+00:00","article_modified_time":"2021-09-17T00:42:38+00:00","og_image":[{"width":1920,"height":1279,"url":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/09\/power-plant-2411932_1920.jpg","type":"image\/jpeg"}],"author":"Gorm R\u00f8dder","twitter_card":"summary_large_image","twitter_misc":{"Skrevet av":"Gorm R\u00f8dder","Ansl. lesetid":"3 minutter"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#article","isPartOf":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/"},"author":{"name":"Gorm R\u00f8dder","@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/#\/schema\/person\/eebdac823cfa66c759dc9640424c33ee"},"headline":"Towards higher energy efficiency in the power and process industry","datePublished":"2018-10-19T10:01:00+00:00","dateModified":"2021-09-17T00:42:38+00:00","mainEntityOfPage":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/"},"wordCount":428,"commentCount":0,"image":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#primaryimage"},"thumbnailUrl":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/09\/power-plant-2411932_1920.jpg","keywords":["energy","energy and process engineering","heat transfer","two-phase-facility"],"articleSection":["Energy","Engineering"],"inLanguage":"nb-NO","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/","url":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/","name":"Towards higher energy efficiency in the power and process industry - NTNU TekNat","isPartOf":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#primaryimage"},"image":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#primaryimage"},"thumbnailUrl":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/09\/power-plant-2411932_1920.jpg","datePublished":"2018-10-19T10:01:00+00:00","dateModified":"2021-09-17T00:42:38+00:00","author":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/#\/schema\/person\/eebdac823cfa66c759dc9640424c33ee"},"description":"Energy is produced in power plants by boiling water, and part of the energy is wasted due to this inefficient heat transfer. 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This means variation in time of the velocity of the flow due to a phenomenon called two-phase flow instabilities.","breadcrumb":{"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#breadcrumb"},"inLanguage":"nb-NO","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/"]}]},{"@type":"ImageObject","inLanguage":"nb-NO","@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#primaryimage","url":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/09\/power-plant-2411932_1920.jpg","contentUrl":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/09\/power-plant-2411932_1920.jpg","width":1920,"height":1279,"caption":"Power plant"},{"@type":"BreadcrumbList","@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/en\/2018\/10\/19\/towards-higher-energy-efficiency-in-the-power-and-process-industry\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Hjem","item":"https:\/\/www.ntnu.no\/blogger\/teknat\/"},{"@type":"ListItem","position":2,"name":"Towards higher energy efficiency in the power and process industry"}]},{"@type":"WebSite","@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/#website","url":"https:\/\/www.ntnu.no\/blogger\/teknat\/","name":"NTNU TekNat","description":"En blogg om teknologi, naturvitenskap, forskning og undervisning ved NTNU","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ntnu.no\/blogger\/teknat\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"nb-NO"},[{"@type":["Person"],"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/#\/schema\/person\/eebdac823cfa66c759dc9640424c33ee","name":"Il Woong Park","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/087a73835edbf8b926e4058158b3a9efeffc0359004e9a59a88b46505b320509?s=96&d=mm&r=g","inLanguage":"nb_NO","url":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/08\/Il_Woong_Park-150x150.jpg","caption":"Il Woong Park"}},{"@type":["Person"],"@id":"https:\/\/www.ntnu.no\/blogger\/teknat\/#\/schema\/person\/eebdac823cfa66c759dc9640424c33ee","name":"Joengrim Ryu","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/087a73835edbf8b926e4058158b3a9efeffc0359004e9a59a88b46505b320509?s=96&d=mm&r=g","inLanguage":"nb_NO","url":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-content\/uploads\/sites\/65\/2021\/08\/JoengrimRyu-150x150.jpg","caption":"Joengrim Ryu"}}]]}},"_links":{"self":[{"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/posts\/2471","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/users\/473"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/comments?post=2471"}],"version-history":[{"count":2,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/posts\/2471\/revisions"}],"predecessor-version":[{"id":2663,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/posts\/2471\/revisions\/2663"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/media\/2472"}],"wp:attachment":[{"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/media?parent=2471"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/categories?post=2471"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ntnu.no\/blogger\/teknat\/wp-json\/wp\/v2\/tags?post=2471"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}