How does an air compressor save electricity?

Update:13-06-2022

Summary:Whether the screw air compressor saves electricity or not, the loading depends on the specific power, and the unloading depends on the internal pressu...

Whether the screw air compressor saves electricity or not, the loading depends on the specific power, and the unloading depends on the internal pressure. Specific power is an important indicator to measure whether an air compressor saves energy. What is specific power? The specific power is to divide the input power of the air compressor unit (Note: if the motor power of an air compressor is 37KW, then it refers to the output power, and the actual operation is larger than 37KW) by the actual gas production. The value is the input specific power of the air compressor, the unit is KW/M3/min. According to the GB19153-2009 standard, by querying the motor power, exhaust pressure, cooling method, etc., you can see whether each air compressor belongs to the first-level energy efficiency, or the second-level or third-level energy efficiency.

For example, a screw air compressor with 37KW, gas output of 6 cubic meters per minute and working pressure of 8 kg, after inquiry, 7.2KW/M3/min is the dividing line between the first-level energy efficiency and the second-level energy efficiency. Level energy efficiency; 8.1KW/M3/min is the dividing line between Level 2 energy efficiency and Level 3 energy efficiency, between 7.3-8.1 belongs to Level 2 energy efficiency, 8.9KW/M3/min is whether the air compressor can be produced and put into the market. The value between 8.2 and 8.9 is the third-level energy efficiency, and if it is greater than 8.9, it is a super power-consuming product, and the state does not allow it to be produced. (Note: The input specific power of the air compressor can be inquired on the official website of the China Energy Efficiency Labeling website, and can be found by regular air compressor manufacturers.)

Now let's make a comparison. For a 6 cubic air compressor, one manufacturer's target specific power is 7.1KW/M3/min (first-level energy efficiency), while another air compressor manufacturer's target is 8.6KW/M3/min (Three-level energy efficiency), then the air compressor with the first-level energy efficiency saves electricity per hour than the third-level energy efficiency air compressor = (8.6-7.1)*6=9 kWh of electricity, according to 1 yuan per hour of industrial electricity, working 10 hours per day If you work 300 days a year, you can save 9*10*300=27,000 yuan a year.

The investment of the air compressor used in the factory consists of three parts, one is the initial purchase cost, the other is the daily operation cost, which is the electricity cost, and the third is the maintenance cost. Usually, the initial purchase cost actually only accounts for the total investment. very small portion. Therefore, when users buy an air compressor, they should know more about the specific power of the air compressor. The purchase price of a good air compressor is more expensive than that of some cheap brands of air compressors, but the electricity bills saved can be recovered within a year. now,