Variable frequency drives : how to Improve Energy Efficiency in Food Frozen and processing field
Variable frequency drives (VFDs) have long been known to save energy, specifically in pump and fan applications. In fact, studies have shown the payback period is often less than one year.
In most food processing facilities, pumps and fans run at constant speeds, and flow rates are adjusted by automatic valves or other mechanical means. This can be highly inefficient because motors running at constant speed always consume the maximum amount of energy, even during periods when lower speed operation would suffice.
VFDs provide more efficient operation by regulating motor speed - and therefore flow rate - electronically in response to changing operating conditions.
In addition, VFDs can be used to improve process control. If a plant uses constant-speed motors to run conveyors on the line, it either must run without material during the time required to change temperature in a heat zone or produce scrap during this period.
When using a VFD, the time needed to change speed is significantly less than the time it takes to change heat-zone temperature. By adjusting the material flow continuously to match heat zone conditions, a plant can operate continuously. The results are decreased energy usage and less scrap.
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