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Unformatted text preview: wn and production use began.
keep the temperature of the molten solder constant at the operating temperature. The equation to
approximate the break even point was thus t = Eheat (5.3) Pidle where the Eeat is the energy required to heat the solder from room temperature to operating temperature, and Pisde is the average power used by the equipment in idle mode to keep the solder
molten. This equation assumes that electricity costs are constant over the course of the day. For
the wave solder machine we measured, Eheat = 35 kWh, Pidle = 5 kW and Theat = 200 min, which yields a break even time of t = 7 hrs. Therefore, if the equipment is scheduled to be idle for more
than 7 hours, there will be electricity savings, as long as the machine is turned on precisely 200 min
before it is scheduled to be used. The cycle savings can then be determined by
S = CPide(Tidle - t), (5.4) where C is the cost of electricity per kilowatt-hour and Tidle is the time the equipment is idle during
a cycle. Using these methods, we determined the typical weekly savings for a single wave solder
machine in CCA is appr...
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- Spring '14