{"id":12519,"date":"2026-10-21T08:00:00","date_gmt":"2026-10-21T05:00:00","guid":{"rendered":"https:\/\/kopar.fi\/?p=12519"},"modified":"2026-08-28T10:37:30","modified_gmt":"2026-08-28T07:37:30","slug":"how-to-heat-circular-economy-materials-efficiently","status":"publish","type":"article","link":"https:\/\/kopar.fi\/en\/miten-kuumat-kiertotalousmateriaalit-jaahdytetaan-energiatehokkaasti\/","title":{"rendered":"How can hot circular economy materials be cooled efficiently?"},"content":{"rendered":"<p>Cooling hot circular economy materials is a process step that directly affects the safety, energy efficiency, and success of the entire production line. The slag from steelmaking, the ash from combustion processes, and other by-products can arrive at the processing facility at temperatures of hundreds of degrees Celsius, and their controlled cooling requires careful planning. The wrong method or an under-sized system leads to blockages, excessive wear, or energy losses that eat up the entire recycling process.<\/p>\n<p>This guide goes through four steps that help you choose and implement an energy-efficient cooling solution for your circular economy process. <a href=\"https:\/\/kopar.fi\/en\/cooling\/\">Discover our cooling solutions<\/a> and see which devices are best suited for your own application.<\/p>\n<h2>Identify the material properties before choosing a cooling solution<\/h2>\n<p>The design of a cooling solution always starts with the material, not the device. The range of recycled materials is vast: hot metallurgical slag behaves completely differently from fine-grained aggregate material or wet sludge. Each material imposes its own requirements on the cooling system, and these requirements must be considered before any equipment is selected.<\/p>\n<p>Collect the following information about the material to be processed before starting the design:<\/p>\n<ul>\n<li><strong>Incoming temperature<\/strong> and the targeted output temperature<\/li>\n<li><strong>Capacity of the material flow<\/strong> in tons per hour<\/li>\n<li><strong>Size and composition of the herd<\/strong>, including the proportion of fine material<\/li>\n<li><strong>Moisture content<\/strong> and possible tendency to liquefaction<\/li>\n<li><strong>Consumability<\/strong> i.e., abrasion caused by the material on the surfaces of the equipment<\/li>\n<li><strong>Chemical reactivity<\/strong>, For example, the risk of oxidation or the presence of toxic compounds<\/li>\n<\/ul>\n<p>In particular, check whether the material is prone to clogging or liquefaction at high temperatures. For example, extremely hot bottom ash can behave uncontrollably if the cooling system does not control these phenomena. The material\u2019s true behavior is best revealed by testing, and in uncertain cases, advance testing in a test facility is clearly a better option than living with uncertainty during the commissioning phase.<\/p>\n<p>Once the material\u2019s characteristics are clear, you have the foundation on which the design of the entire cooling solution is built.<\/p>\n<h2>Choose the correct cooling method based on the material and process<\/h2>\n<p>Based on the material data, you can assess which cooling method is best suited for your process. The most commonly used methods in industrial circular economy applications are cooling screws, cooling drums, and cooled shuttle conveyors. Each has its strengths, and the choice depends on the temperature levels, capacity, and material properties.<\/p>\n<ol>\n<li><strong>Estimate the temperature level:<\/strong> Very high inlet temperatures, such as 700\u2013900 \u00b0C, require high-power cooling, for which rotating coolers or cooling drums are best suited. At more moderate temperatures, a traditional cooling screw may suffice.<\/li>\n<li><strong>Check the capacity requirement:<\/strong> In applications with high capacity, a single high-power device is often more cost-effective than multiple smaller devices in parallel.<\/li>\n<li><strong>Note the material's cost:<\/strong> The structure and coatings of the device determine the lifespan of the device without significant maintenance measures.<\/li>\n<li><strong>Estimate space usage:<\/strong> If the process space is limited, a compact solution that produces the same cooling power in a smaller size can be a decisive factor.<\/li>\n<\/ol>\n<p>In the recycling of pet material, such as the handling of gravel or granulates in jaw crushers, the combination solution often works best: a cooling screw conveyor, a rummular conveyor and pneumatic transport form a functioning unit together. In the cooling of the cones, however, high temperatures and abrasion are emphasized, which dictate the choice of more robust solutions.<\/p>\n<p>At this stage, ensure that the selected method is compatible with the other stages of the process. The subsequent screening, storage, or pneumatic transport after cooling imposes its own requirements on the output temperature and the material's state. <a href=\"https:\/\/kopar.fi\/en\/contact\/\">Contact us<\/a>, If you want to discuss the choice of method with our experts, please do so.<\/p>\n<h2>Measure the cooling system's energy efficiency above all else<\/h2>\n<p>The right sizing is the foundation of energy efficiency. An oversized system consumes unnecessary energy and increases investment costs. An undersized system, on the other hand, does not reach the target temperature, which can stop the entire production line or cause a safety risk. The goal of sizing is to find the exact balance between cooling power, capacity, and energy consumption.<\/p>\n<ol>\n<li><strong>Calculate the required cooling capacity:<\/strong> Use the material's specific heat capacity, mass flow, and temperature difference (input minus target output) to calculate the required power in kilowatts or megawatt hours.<\/li>\n<li><strong>Note process variations:<\/strong> Scale the system to the maximum capacity, but ensure that it also operates at partial loads without significant energy losses.<\/li>\n<li><strong>Estimate the cooling water consumption:<\/strong> In water-cooled devices, the temperature and flow of the cooling water directly affect the output temperature that can be achieved. Optimize these parameters in conjunction with the device manufacturer.<\/li>\n<li><strong>Check the device's efficiency:<\/strong> Compare the cooling performance of different types of equipment relative to their space requirements and maintenance costs. A single high-power device can offer a better efficiency ratio than two smaller devices operating in parallel.<\/li>\n<\/ol>\n<p>Energy efficiency does not only mean minimizing electricity consumption. It also means that the cooling system does not cause unnecessary outages or excessive wear and tear, which increases indirect costs. <a href=\"https:\/\/kopar.fi\/en\/the-undersizing-or-oversizing-of-a-cooling-system-will-affect-the-lifespan-of-the-appliance\/\">Read about how sizing affects the device's lifespan<\/a> and why it\u2019s worth doing carefully right from the planning stage.<\/p>\n<p>Also check whether there is a possibility to utilize the heat released during cooling in another part of the plant. Heat recovery is not always feasible, but in circular economy projects it can significantly improve the energy balance of the entire process. <a href=\"https:\/\/kopar.fi\/en\/contact\/\">Ask our experts<\/a> of sizing calculations and energy efficiency optimization.<\/p>\n<h2>Ensure the cooling system is operational during the commissioning phase<\/h2>\n<p>Careful planning and sizing create a good foundation, but the true behavior of the material often only becomes apparent during the commissioning phase. At this stage, it is important to systematically monitor the system\u2019s performance and react quickly to any observed deviations before they develop into larger problems.<\/p>\n<ol>\n<li><strong>Start the system gradually:<\/strong> Start with a lower capacity and gradually increase the load. This gives time to detect any blockages, uneven material flow, or temperature deviations before full production.<\/li>\n<li><strong>Measure the output temperature at each stage:<\/strong> Compare the measured values with the planned target values. Significant deviations indicate either a design error, unexpected material properties, or a malfunction of the device.<\/li>\n<li><strong>Check for wear after the first few hours of use:<\/strong> Especially with consumer materials, wear can be faster at the beginning as the surfaces are ground down. Check the critical points and assess whether the wear rate meets expectations.<\/li>\n<li><strong>Document the observations:<\/strong> Write down the results of the start-up phase measurements, any deviations, and any adjustments made. This information is valuable for both subsequent optimization and any potential troubleshooting.<\/li>\n<\/ol>\n<p>If problems arise during the commissioning phase, do not try to solve them by simply adjusting process parameters. The root cause may lie in the material properties, the installation or dimensioning of the equipment, and the right solution can only be found by systematically analyzing the situation. In this phase, close collaboration with the equipment supplier is particularly valuable.<\/p>\n<p>After commissioning, system performance is best ensured through regular monitoring and proactive maintenance. A well-functioning cooling system is the foundation of the reliability of the entire circular economy line. <a href=\"https:\/\/kopar.fi\/en\/references\/\">View our case studies<\/a> and see how we have implemented cooling solutions for various circular economy applications.<\/p>\n<p>Kopar designs and delivers cooling solutions for the most demanding applications in the circular economy, from hot metallurgical billets to fine-grained battery materials. Our pilot plant allows the behavior of new by-products to be tested in advance, reducing commissioning risks and improving the solution\u2019s operational reliability. <a href=\"https:\/\/kopar.fi\/en\/cooling\/\">Discover our cooling solutions<\/a> or <a href=\"https:\/\/kopar.fi\/en\/contact\/\">Get in touch<\/a>, Let\u2019s go through together which solution best suits your process.<\/p>","protected":false},"excerpt":{"rendered":"<p>Cooling hot circular economy materials requires the right method. Four steps to a energy-efficient solution.<\/p>","protected":false},"featured_media":5163,"menu_order":0,"template":"","class_list":["post-12519","article","type-article","status-publish","has-post-thumbnail","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/article\/12519","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/article"}],"about":[{"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/types\/article"}],"version-history":[{"count":1,"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/article\/12519\/revisions"}],"predecessor-version":[{"id":12524,"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/article\/12519\/revisions\/12524"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/media\/5163"}],"wp:attachment":[{"href":"https:\/\/kopar.fi\/en\/wp-json\/wp\/v2\/media?parent=12519"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}