After the compressed air load has been reduced and any leaks in the distribution network have been repaired, a new correctly sized compressor can be installed to increase energy efficiency.
Since air compressors are most efficient near full load, the most energy efficient air compressor is one which is appropriately sized for the application. If the compressed air load is unavoidably variable, a combination of smaller compressors may meet the load more efficiently. One compressor is used to meet the base load, while the other compressors are brought online just to meet peak loads.
There are many types of compressors, including reciprocating, vane, screw, centrifugal, scroll, and rotary tooth. Each type of compressor has its advantages and disadvantages, but generally, reciprocating and centrifugal compressors are the most efficient. 1 Peak loads can also be reduced by using storage receivers, which can store 5-10% of compressor capacity.
See the Compressed Air technology page on the EEX website.
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