Process Management Principles for Increasing the Energy Efficiency

The power factor p is a dimensionless number between

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Unformatted text preview: is a dimensionless number between 0 and 1 and is defined as the ratio of the real power flowing to the load to the apparent power in the circuit. Usually, p, or the power factor, is not included on the label. Based on measurement of a variety of equipment in the facility, however, we assume for simplicity that when we need to estimate p, inductive loads (motors, pumps etc.) have p = 0.75, resistive loads (heating elements) have p = 1, and older computerized test equipment have p = 0.6. For a three phase circuit, which most of the large industrial equipment in the IADC operates on, the equation becomes 3 Preal = \/5( i=1 VIp (4.2) where i indexes each phase. While this method is fast and inexpensive, there are significant drawbacks stemming from the fact that the label only indicates maximum power draw rather than a profile of energy use over different operational modes. Occasionally, this information may be furnished by other equipment documentation or manufacturer support, though based on experience the likelihood of those resources existing tends to decline with the age of the equipment. In general, experience sug...
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This document was uploaded on 03/03/2014 for the course ADMIN 1 at Universidad Nacional de Colombia.

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