Air Compressors Info

The power consumed by a compressor is proportional to the specific volume, which is proportional to the absolute temperature of the gas at a given pressure. It is also clear that the compressor work is directly proportional to the inlet temperature of air. Therefore, the lower the inlet temperature of the air, the smaller the compressor work. Then the power reduction factor, which is the fraction of compressor power reduced as a result of taking intake air from the outside, becomes f reduction = (W comp, inside - W comp, outside ) / W comp, inside f reduction = (T inside - T outside ) / T inside f reduction = 1 - (T outside /T inside ) where T inside and T outside are the absolute tempertaure (in K or R) of the ambient air inside and outside the facility, respectively. Thus reducing the absolute inlet temperature by 5%, for example, will reduce the compressor power input by 5%. As a rule of thumb, for a specified amount of compressed air, the power consumption of the compressor ...

To understand how to save the energy in compressed air system , it is useful to start with theory background of how the air compressors work and how the energy is consumed. As we know from Thermodynamic principle that the compressor work is, where: rev = reversible in = input Our objective is to minimize the air compressor work that means to approach the reversible process i.e. minimize the friction, and turbulence Practical way to do this is to make v (specific volume) small by maintaining T (temperature) at low temperature during compression because v a T. In other words, to reduce the work input to a compressor, air should be cooled as it is compressed. Effect of Cooling Isentropic process: No cooling during compression Polytropic process: Involve some cooling Isothermal process: Involve maximum cooling Which process yields the minimum required compressor work? Let's consider the following equations of each process. Assumptions: All three processes are executed between the same...