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Unformatted text preview: ample, Figure 5-10 depicts a
common operator practice of turning ovens on well before product was likely to be placed inside the
oven. SME input and equipment documentation, however, indicate that it usually takes no more
than 30 min to warm the oven up to temperatures used in the process. For the day depicted in
Figure 5-10, turning the oven on only when necessary would have shaved about 2.5 hours of idle
energy usage off. If we assume the oven was in operation for the remainder of the day (18.5 hours),
then that, would have resulted in a 13.5% reduction in electricity usage that day. If we combine that
result with similarly observed behavior in terms of operators leaving ovens on unnecessarily until the
end of shift, a conservative estimate is that an additional 15-20% of electricity usage could be saved
based on diligent manual oversight of oven usage. Furthermore, installing timers and automating
vacuum pressure monitoring could save even more electricity for instances when ovens are left on
unnecessarily overnight and during weekends after minimum bake times and vacuum pressure are
achieved. It is...
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- Spring '14