Baking & Snack - March 2009 - 43

ENERGY ENGINEERING

45

Power

PURSUIT

Know the difference between power-quality improvements and energy reduction.

BY PAUL H. STILLER, PE, CEM
nergy prices are likely to continue to escalate for
the foreseeable future. Bakeries and other food
processing plants that effectively manage energy
will have a competitive advantage as utilities become a larger portion of conversion cost. The question
many operators ask is, "How do power-quality devices fit
into my overall energy reduction strategy?"
Electric power-quality products such as filters, surge
suppressors and capacitors can effectively solve common electric equipment problems. They protect against
damage caused by voltage sags, surges, harmonics and
other transients. Bakeries that experience these problems
should consider the many power-quality solutions that
are available.
However, most power-quality devices do not save significant amounts of energy. If your primary goal is to improve energy management and reduce usage, you should
direct your attention and limited resources to areas more
likely to yield significant results. It is important, none the
less, to understand the role power quality devices play in
your operation.

E

POWER QUALITY/ENERGY SAVINGS. As noted, power-quality solutions generally do not significantly reduce
energy cost. Devices such as capacitors, filters, zig-zag
reactors, soft starters and surge suppressors solve reliability and equipment availability problems. The benefits can
be critical if you have these problems. While there may be
a small energy-saving benefit, it is generally insignificant
in evaluating the investment and should be ignored.
Ideal electric power systems are balanced with 50 to
60 Hz sine-wave voltage and current. There are no interruptions or momentary deviations from these conditions, and voltage level is always within nominal range.
Of course, the real world is far from ideal, and modern
bakeries face a variety of power-quality defects. These
may include voltage sags and surges, harmonic distortion, unbalance, momentary interruptions or excessive

ᮣ Large rooftop HVAC units are typically
sources of significant energy usage -
improved control of these units can lead to
energy consumption reductions.

March 2009 / BAKING & SNACK



Baking & Snack - March 2009

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