{"id":305,"date":"2015-01-27T01:03:14","date_gmt":"2015-01-26T23:03:14","guid":{"rendered":"http:\/\/54.93.104.239\/?p=305"},"modified":"2022-11-09T16:50:06","modified_gmt":"2022-11-09T14:50:06","slug":"minimize-tempering-line-energy-consumption-12","status":"publish","type":"post","link":"https:\/\/www.glastory.net\/fi\/minimize-tempering-line-energy-consumption-12\/","title":{"rendered":"How to minimize your tempering line energy consumption (1\/2)"},"content":{"rendered":"<p>It is no surprise that energy efficiency discussions have widely spread to include\u00a0glass tempering lines. After all, glass tempering can\u2019t be considered\u00a0a\u00a0&#8220;green process&#8221;. How we look at energy consumption is not only about green values, the environment and government subsidies, it\u2019s also about decreasing operating costs.<\/p>\n<p>The topic, however, is also maybe the most misunderstood one\u00a0in the industry. Line manufacturers and processors talk constantly using\u00a0the terms without fully comprehending what certain\u00a0terms and numbers actually mean. We wanted to give you some\u00a0insight into your real\u00a0line energy consumption and how to minimize it. No matter if you are thinking of going into the business or are already running a tempering line, we believe\u00a0this information will be helpful.<\/p>\n<p>In Part 1, I will concentrate on helping you understand where the energy is actually going. And Part 2 will include practical guidelines to minimize your energy consumption.<\/p>\n<p>Let\u2019s start from\u00a0defining\u00a0the main terms. To make things simple, there are 3 terms you need to understand:<\/p>\n<ul>\n<li>Energy consumption<\/li>\n<li>Installed power<\/li>\n<li>Average process power<\/li>\n<\/ul>\n<p>Energy consumption is the amount of <strong>kWh\u00a0<\/strong>you use to get a certain amount of glass processed. Note! The unit of energy consumption is kWh, <em>not<\/em>\u00a0kW or kVA. Energy consumption should always be mentioned as\u00a0the function of produced glass per area, and thus, the energy consumption unit should always be kWh\/m<sup>2 <\/sup>(or ft<sup>2<\/sup>).<\/p>\n<p>Installed power, which has <em>nothing<\/em>\u00a0to do with energy consumption, is the power of all electrical components calculated together. This figure alone does not mean anything. However, the heating power directly tells the tempering line\u2019s ability to run at high-capacity production. When combined with information on\u00a0how much of this power is used at different stages in\u00a0the process, it\u00a0can be used to dimension\u00a0transformers. As a comparison, this is like looking closely only at the engine size when buying a car without looking at the fuel consumption figures.<\/p>\n<p>The average process power (APP) means the average power demand during one tempering cycle with a given\u00a0product. The unit of APP is usually kVA or kW. APP always changes with the glass type and thickness. APP can be easily decreased \u2013 just run less glass. In other words, APP is always higher the more glass you run. So for instance, if you have a fast and efficient tempering line, your\u00a0APP will be higher. Note! This does not apply to energy consumption (kWh). If you have a fast and efficient tempering line, the energy consumption per produced m<sup>2<\/sup> will actually\u00a0<strong><em>decrease<\/em><\/strong>.<\/p>\n<p>Now, let\u2019s look more closely at the\u00a0tempering line&#8217;s energy consumption.<\/p>\n<p><strong>Tempering line energy consumption breakout<\/strong><\/p>\n<p>To understand which of these machine parts has\u00a0a bigger impact, here is an example of\u00a0one glass tempering line\u00a0when it runs\u00a0different glass types.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-4236 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption-300x269.jpg\" alt=\"Energy consumption\" width=\"315\" height=\"282\" data-sizes=\"auto\" data-srcset=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption-300x269.jpg 300w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption-640x574.jpg 640w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption.jpg 725w\" sizes=\"(max-width: 315px) 100vw, 315px\" \/><noscript><img decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-4236\" src=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption-300x269.jpg\" alt=\"Energy consumption\" width=\"315\" height=\"282\" srcset=\"https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption-300x269.jpg 300w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption-640x574.jpg 640w, https:\/\/www.glastory.net\/wp-content\/uploads\/2015\/01\/Energy-consumption.jpg 725w\" sizes=\"(max-width: 315px) 100vw, 315px\" \/><\/noscript><\/p>\n<p>Let\u2019s look more in detail into each section of the line. As loading and unloading conveyors are peanuts in terms of overall line energy consumption, let\u2019s concentrate on the furnace and the quench.<\/p>\n<p><strong>Energy consumption in heating<\/strong><\/p>\n<p>The furnace section accounts for the biggest share\u00a0of the total glass tempering line energy consumption. The most significant amount of energy actually goes to heating the glass. The nice thing is that heating the glass is constant. It cannot be affected, since it is determined by the nature of float glass as a material and the laws of physics. This means no matter what technology you have, the glass will always need the same amount of energy to be heated up.<\/p>\n<p>In the theoretical world, the only energy needed would be the theoretical minimum for\u00a0glass heating. In real life, however, we have losses. These losses are:<\/p>\n<ul>\n<li>Heat loss through walls: some heat energy is released to the environment through the furnace walls.<\/li>\n<li>Heat loss due to convection compressed air: if compressed air is used as the convection method, the air that goes into the furnace also needs to come out. From an energy consumption point of view, this is lost energy.<\/li>\n<li>The energy needed to generate the convection, such as compressor power or motor power for circulated convection systems.<\/li>\n<\/ul>\n<p><strong>Energy consumption in quenching and cooling<\/strong><\/p>\n<p>The quench also forms a significant part of the total energy consumption in the tempering process. With thinner glasses, it actually accounts for\u00a0approximately the same amount of total energy consumed as the\u00a0heating.<\/p>\n<p>The component that consumes energy in the quench is blower motor(s), which\u00a0create an\u00a0air pressure that tempers the glass. The main factors that affect the total energy consumption in the quench are:<\/p>\n<p><em>Loading efficiency<\/em>: The bigger the loading efficiency, the lower the energy consumption.<\/p>\n<p><em>System used to run the\u00a0blower motor<\/em> (like inverters): Inverters allow the motor power to run down in between the heating cycles in an oscillating furnace. The more you can run the power down, the more energy you can save.<\/p>\n<p><em>Pressurized area in quenching: S<\/em>ometimes thin glass is run with lower loading efficiency. The solution is to limit the pressurized area in the quench. <em>\u00a0<\/em><\/p>\n<p><em>Capacity of the furnace<\/em>: The capacity of the furnace has a direct impact on the kWh\/m<sup>2<\/sup>. The higher the line capacity, the lower the blower idling time and power. Even though blower motors have inverters, they still consume some energy in between the loads.<\/p>\n<p><strong>What next?<\/strong><\/p>\n<p>In\u00a0Part 1, I concentrated on defining\u00a0the main sources of energy consumption. You hopefully can\u00a0pick up some actionable points just by understanding the concepts correctly. In Part 2, I will include practical advice regarding the\u00a0parts you should concentrate on when aiming to minimize\u00a0your tempering line&#8217;s energy consumption. Stay tuned!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is no surprise that energy efficiency discussions have widely spread to include\u00a0glass tempering lines. After all, glass tempering can\u2019t be considered\u00a0a\u00a0&#8220;green process&#8221;. How we look at energy consumption is not only about green values, the environment and government subsidies, it\u2019s also about decreasing operating costs. The topic, however, is also maybe the most misunderstood [&hellip;]<\/p>\n","protected":false},"author":75,"featured_media":202,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[1041],"tags":[777,2306,1139,722,2253,774,2294,2256,674,694,2257,2565,804,775],"acf":[],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to minimize your tempering line energy consumption?<\/title>\n<meta name=\"description\" content=\"How to minimize your tempering line energy consumption?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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