{"id":8569,"date":"2022-05-13T12:46:57","date_gmt":"2022-05-13T10:46:57","guid":{"rendered":"https:\/\/www.tempco.it\/blog\/?p=8569"},"modified":"2022-05-13T12:47:28","modified_gmt":"2022-05-13T10:47:28","slug":"fluids-flow-in-heat-exchangers-counter-flow-vs-parallel-flow","status":"publish","type":"post","link":"https:\/\/www.tempco.it\/blog\/en\/8569\/fluids-flow-in-heat-exchangers-counter-flow-vs-parallel-flow\/","title":{"rendered":"Fluid\u2019s flow in heat exchangers, counter-flow vs. parallel-flow"},"content":{"rendered":"<p>What\u2019s the difference between <strong>counter-flow and parallel-flow<\/strong> <a href=\"https:\/\/en.tempco.it\/solutions-en\/heat-exchangers\/\" target=\"_blank\" rel=\"noopener\"><strong>heat exchangers<\/strong><\/a>, and why and when the two typologies of thermal transfer are employed?<\/p>\n<p>We\u2019re talking about the <strong>flowing of fluids in heat exchangers<\/strong>, which means counter-flow and parallel-flow exchangers. The meaning is said in the word itself: in a counter-flow exchanger, the two fluids exchanging thermal energy each other flow within the exchanger in opposite directions.<\/p>\n<p>This is easy to understand with <strong><a href=\"https:\/\/www.tempco.it\/blog\/en\/8426\/plate-heat-exchangers-and-hydraulics\/\" target=\"_blank\" rel=\"noopener\">plate heat exchangers<\/a><\/strong>, where <strong>counter-flow<\/strong> means that one fluid flows top-down and the other goes bottom-up. In one-pass <a href=\"https:\/\/en.tempco.it\/solutions-en\/heat-exchangers\/shell-and-tube-heat-exchangers\/\" target=\"_blank\" rel=\"noopener\"><strong>shell and tube exchangers<\/strong><\/a>, there is a fluid flowing inside the shell and the other flowing inside the tubes in the opposite direction. A little more complicated to understand with <a href=\"https:\/\/www.tempco.it\/blog\/en\/8492\/multi-pass-plate-heat-exchanger-for-hydraulic-power-unit\/\" target=\"_blank\" rel=\"noopener\">multi-pass exchangers<\/a>. In an <strong>air-cooled exchanger<\/strong>, a finned exchanger, finally, the air flows in the opposite direction compared to the water.<\/p>\n<p><strong>Parallel-flow<\/strong> is the exact contrary working principle, with both fluids flowing in the same direction.<\/p>\n<p><iframe loading=\"lazy\" width=\"750\" height=\"422\" src=\"https:\/\/www.youtube.com\/embed\/r6OAlhPqgtY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n<p>The most relevant difference is that a <strong>counter-flow exchanger achieves higher thermal transfer rates<\/strong>, allowing to obtain output temperatures of one fluid very close to the inlet temperature of the other. And it works for both cooling and heating. In addition, in plate heat exchangers is it also possible to have <a href=\"https:\/\/www.tempco.it\/blog\/en\/6675\/how-does-a-plate-heat-exchanger-work-tempco-video\/\" target=\"_blank\" rel=\"noopener\"><strong>temperature crossing<\/strong><\/a>, obtaining much higher efficiency and thermal transfer coefficients than comparable temperature crossing in other kind of exchangers.<\/p>\n<p><strong>Parallel-flow<\/strong> thermal transfer doesn\u2019t therefore allow temperature crossing, because the temperatures of the two fluids will tend to be very close during the overall process, from start to finish. This is employed when a process requires <strong>heating, cooling or thermal transfer tasks that are less intense and invasive<\/strong>, and so more \u2018soft\u2019, involving a lower thermal impact upon the product which gets cooled or heated. For example, thermal transfers in the <a href=\"https:\/\/www.tempco.it\/blog\/en\/8197\/mono-fluid-thermoregulation-in-pharmaceutical-industry\/\" target=\"_blank\" rel=\"noopener\"><strong>pharma sector<\/strong><\/a> or the <a href=\"https:\/\/www.tempco.it\/blog\/en\/8361\/temperature-regulation-for-flaking-and-lamination-in-food-and-pharma\/\" target=\"_blank\" rel=\"noopener\"><strong>food industry<\/strong><\/a>, where the product to be cooled\/heated needs specific thermal schemes with no shocks, that otherwise could cause an alteration of the product itself compromising the quality of the final product.<\/p>\n<p>Stay updated on the latest applications by subscribing our monthly <strong><a href=\"https:\/\/en.tempco.it\/newsletter-solid-temperature\/\" target=\"_blank\" rel=\"noopener\">Tempco Newsletter &#8211; Solid Temperature<\/a><\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Differences and employs of counter-flow and parallel-flow heat exchangers, high thermal transfer rates and temperature crossing with the first kind and more &#8216;soft&#8217; cooling or heating with the other for delicate products in pharma and food processing. <\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[64,61,63,66,113,473,84],"tags":[3278,127,3275,486,3277,1758,556,138,137,3276,148,866,123,1627,1543,3274,125,1837],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.5 - 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