Specific power---Energy efficiency rating--Energy efficiency label

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Specific power—efficiency class—efficiency label: When measuring the efficiency of compressors, specific power is the only indicator. Specific power refers to the power consumed by a compressor per unit volume flow rate. It is an important indicator for evaluating the efficiency of compressors. (For compressing the same gas at the same discharge pressure) Specific power = Input shaft power/Displacement (kW/m3·min-1). Shaft power: The power required to drive the compressor’s shaft. P-axis = √3×U×I×cosφ×η_motor×η_transmission. The lower the specific power value, the higher the efficiency of the compressor. Based on this specific power, there is a standard, GB19153-2009 \"Efficiency Limits and Efficiency Grades for Positive Displacement Compressors\", which specifies the different efficiency grades corresponding to various levels of specific power. Energy efficiency levels are divided into three grades, with grade 1 being the highest. An energy efficiency label, indicating the energy efficiency grade, must be attached to a prominent position on the machine’s outer box at the time of its manufacture. Similar to the energy efficiency label for household air conditioners. Please refer to the following explanations regarding energy efficiency labels: The Outline of the 11th Five-Year Plan for National Economic and Social Development sets mandatory targets for the 11th Five-Year period, aiming to reduce energy consumption per unit of GDP by around 20% and to cut the total emissions of key pollutants by 10%. **The \"Comprehensive Work Plan for Energy Conservation and Emission Reduction\" formulated by the National Development and Reform Commission in conjunction with relevant departments further clarifies the goals and overall requirements for achieving energy conservation and emission reduction. Meanwhile, using electricity rationally, conserving electricity, and converting some waste energy into electrical energy have become top priorities in efforts to conserve energy and reduce emissions. In terms of business operations, rising energy costs are placing significant pressure on corporate profits. As air compressors are major energy consumers, saving electricity not only helps to comply with relevant policies but also brings substantial benefits to the development of the enterprise itself. How can air compressors save energy? In addition to carrying out the necessary technical upgrades, optimizing process design, preventing leaks, and maintaining good usage habits, it is important to choose energy-efficient models; in other words, this is the most fundamental solution. Choose energy-efficient air compressors; it doesn’t matter what type of compressor it is. What’s important is the ratio of electricity consumption to air output, in other words, whether the investment in the compressor yields the best economic results. **In 2009, the standard \"GB19153-2009 Efficiency Limits and Efficiency Grades for Positive Displacement Compressors\" was adopted, and the efficiency labeling system came into effect in 2010. It is stipulated that as of March 1, 2010, all positive displacement air compressors produced, sold, and imported in the Chinese mainland must be equipped with energy efficiency labels; products that fall below energy efficiency level 3 are not allowed to be produced, sold, or imported in the Chinese mainland. Products manufactured or imported before March 1, 2010, can have their energy efficiency labels applied by March 1, 2011. Well, at the very least, all positive-displacement air compressors available on the market today (including piston and screw compressors) must have an energy efficiency label displayed in a visible location. Otherwise, it is not allowed to be sold. The energy efficiency grades for positive displacement air compressors are divided into three levels: Level 3 energy efficiency represents the minimum required energy efficiency value; products that meet this level are considered to have satisfactory energy efficiency. Those that achieve Level 2 or higher energy efficiency, including Level 1, are classified as energy-saving products. Level 1 offers the highest energy efficiency, the lowest energy consumption, and thus represents the most energy-efficient products. The criterion for determining energy efficiency grades is specific power, that is, the power consumed to produce each unit volume of air. Energy efficiency grades cannot be determined by companies themselves; they must be assessed by **authorized professional testing institutions**. The only such institution for screw air compressors is the Hefei General Machinery and Electrical Products Testing Institute, and the assessment is carried out in accordance with the standard GB19153-2009 “Energy Efficiency Limits and Grades for Positive Displacement Compressors”. There are many manufacturers that produce screw-type air compressors, and the parameters listed in their product catalogs – such as power and airflow volume – are almost identical. How can there then be any talk of differences in energy efficiency or energy savings? ? This is because different manufacturers use various measurement standards and technical specifications, and some unscrupulous manufacturers deliberately overstate the gas production volume and conceal the actual power values in order to deceive customers; therefore, it is impossible to determine the level of energy efficiency based solely on the parameters provided in the manufacturer’s product samples.