Compressed air systems: a guidebook on energy and cost by E. M Talbott

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By E. M Talbott

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Example text

Since the ac motor presents a load that is part inductance and part resistance, the current will lag the voltage by a phase angle whose cosine is proportional to the ratio of the active current to the apparent current. Low values of the pf indicate more inductance (vs resistance) in the load and a great phase angle. , kVA). These relationships are shown diagrammatically in Figure 3-11, B and C. The actual line current to the motor, as measured by an ammeter, is the vector sum of the active and reactive currents.

Speed changing gears in the driving train are seen less frequently, most often for powering centrifugal compressors with electric motors. 3 Controls There is a growing variety of control systems available for compressed air installations. These most often concern electric driver controls and compressor controls. 1 Electric Motor Starters Four types of mechanisms for starting various sizes of three phase induction motors are common and commercially available. The controls for synchronous motors, which are used less frequently, are more complex and should be specifically tailored to each installation by the electrical equipment supplier.

5 Existing System Improvement 177 5. 3 Pressure Drop and Leakage Cost Reduction 200 6. S. S. Government Reports NTIS SAN-1731-Tl and SAN 1731-T2, Comparative Study of the Energy Characteristics of Powered Hand Tools. This previous work by United States Department of Energy (DOE) contractors, most especially the authors of this report, while performing another DOE contract, have led to firsthand, factory-level experience with compressed air systems and the energy factors associated with them. These observations of factory operations, and how compressed air is being used, were made by objective engineers having no economic interest either in the factory operation or in the marketing of compressed air equipment.

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