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Unformatted text preview: erviews, it was found that the lack of understanding
largely stemmed from the fact that there was no existing process in which to use the data to improve energy efficiency. Nevertheless, the lack of general institutional knowledge and data in this area was
found to be a critical barrier to overcome during process improvement activities.
Estimation from Equipment Documentation
The easiest, cheapest, and least accurate way to determine how much energy a piece of equipment uses is to use the power supply label on the machine itself. In most cases, this label will include
the maximum power draw of the equipment. In some cases, however, it will only include maximum
current for different voltages the device supports. In that case, it is possible to estimate real power
using the equation,
Preali = VIP (4.1) for a single phase circuit, where Pre,, is real power, V is voltage, I is current, and p is the power
factor. If I is measured in amps, then Prea is in units of watts. The power factor, p,...
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- Spring '14