Variable Speed Drive reduces the overall load on the power grid and minimizes sudden spikes in demand that can overload the grid and cause an outage. As a result, governments and power companies may provide incentives for manufacturers to upgrade to energy-saving systems such as a VSD air compressor. These incentives can significantly offset the costs of upgrading to a new VSD air compressor and accelerate the payback period.
The optimal design of a compressed air system will reflect the specific needs of your processes, your facility and your approach to capital projects. To learn more about how Variable Speed Drive can address your needs, talk to an air system professional.
First, a little background on fixed and variable-speed drive.
A fixed-speed compressor operates at the same speed continuously, cranking along at the same RPM, no matter what the systems demand. And, unless you change the pressure, the compressors output of CFM will also remain the same.
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A VSD air compressor, on the other hand, is equipped with a variable frequency drive or inverter that allows it to adjust its motor speed or RPM (and thus its CFM) to match the real-time demand for compressed air. When the demand drops, the inverter dials back the motor operation to a lower speed (and lower CFM). It thus consumes proportionately less energy (and money), creating a relatively linear output-to-input efficiency curve.
VSDs are an extremely energy-efficient way to address rapid cycling, which occurs when your air compressor switches back into the loaded state before the transition to the no-load state is complete. If that happens too frequently, it can cause increased wear and reduce compressor reliability and lifespan.
VSDs are recommended when the compressor operates at a load between 30% and 80% of its total capacity most of the time. They are not recommended when your compressor is running at 100% load most of the time as the VSD drive itself has some losses (that can be overcome by optimizing tip speeds). But they are very valuable as a trim compressor complementing a base load compressor (see System Reconfiguration section below).
Variable-speed drives complement rotary screw air compressor technology exceptionally well.
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