Air System Basics

Air System Basics

     Compressed air system ━ power-hungry

According to the U.S. Department of Energy ’s statistics, in the United States, the compressor is the industry’s largest power equipment. Although the U.S. Department of Energy was once considered the most motors are power equipment, improved design and operation of the compressed air system energy savings obtained greatly exceed the motor efficiency resulting energy savings.

Through improved design and operation of the compressed air system energy savings of 20-50 % . Many companies will air as equivalent to coal, electricity, water it supplies . It is different from other real products , few people know that every cubic meter / min compressed air costs.

Per cubic meter / costs of the compressed air

Available through the following calculation ,

· Assumptions:

Motor Service Factor = 110%

Power factor = 0.9

· A typical compressor can produce 4CFM per 1 HP

· 1 HP = 110% x0.746kW/0.9 = 0.912kW

· Therefore, the compressed air generated 1CFM need 0.228kW

• If electricity is 0.65 yuan per kWh : 1CFM = 0.1482 yuan / hour

· 1 m3 / min = 35.315CFM

· So one cubic meter / min = 5.23 yuan / hour

· So a 10 m3 / min compressor will run 8,000 hours Power consumption : 10 x 8,000 x 5.23 = 418,694 yuan

Where you can save your electricity bill ?

In a typical plant , air leakage 20% of the total demand .

Suppose a factory compressed air system

· Run 8,000 hours per year

· 0.65 yuan per kWh electricity

· Line pressure = 7.0 kgf/cm2

· Plant air : 10 m3 / min

· Pipeline leak: 20% : 2 m3 / min

· Total required volume : 12 cubic meters / min.

Compressed air electricity

10 x 8,000 hours x 5.23 yuan = 418,694 yuan

2 x 8,000 hours x 5.23 yuan = 83,738 yuan

Total 502,433 yuan

Leak also generate enough additional load forcing two air compressors running simultaneously.

· There is no backup machine

• You can not carry out any maintenance of a

At 7.0 kgf/cm2 pressure generated under 2 m3 / min leak leak points required :

· 3 3mm leak : 2.2 m3 / min, or

· A 6mm leak points : 2.832 m3 / min