How Variable Speed Drive is a Cost-Effective Solution for Your Application?

For applications where variable speeds are required, usually, an AC motor with an inverter or brush motors are used. Brushless DC motors are an innovative option due to their extensive speed range, low heat, and maintenance-free operation. High stepper motors provide high torque and smooth low-speed operation.

To govern when to apply this technology, end users must deportment detailed calculations to confirm the cost-effectiveness of using a VSD. It is ideal to find a reliable variable speed drive manufacturer to buy a high-quality product. Below, I’m going to share how VSD is a cost-effective option for your application. 

• VFD Benefits
  
  A VFD contrasts the speediness of a three-phase, alternating current induction motor by altering the voltage and frequency of the motor’s input power. Changing the speed of the motor progresses efficiency by varying the pump’s output for matching genuine pressure or flow necessities.
  
  Any new or prevailing pump system with a dynamic request is an applicant for a VSD installation. If the pump frequently functions at a low flow rate, monitoring motor speed with a VSD will affect much lower energy costs related to running the motor at full speed and controlling its flow output with a control valve.
  
  Because essential pump motor power rises at a much faster rate than flow, pumping fluid faster than essential can alter energy use suggestively. In addition to dropping power consumption, a VSD can also help decrease automatic wear, maintenance, and associated costs.

A VSD's capability to intensely grow energy efficiency when used to rheostat a centrifugal pump.

• Calculating VFD Cost & Savings
  
  To regulate if a VFD is an effective and cost-effective choice for either a new or retrofit design, the operator must first consider working circumstances and then analyze cost and energy investments by following some steps.
  
  
• Regulate the pump's minimum to extreme pressure/flow curve.
  
  
• Contain alternative flow paths and connected system bends for all effective modes.
  
  
• Stipulate the motor and pump to meet both the lowest and highest needs on the pump presentation curve.
  
  
• Estimate the time the pump turns at low, medium, and high flow rates.
  
  
• Estimate cost of kilowatt-hours (kWh) at each flow rate, counting a 3-percent VFD loss.
  
  
• Interpret these costs into annual savings associated with consecutively the pump at full speed.
  
  
• Improve in any rebates from the usefulness for VFD installations.
  
  
• Add in condensed preservation and longer pump life ensuing from running the pump at lower speeds.
  
  
• Consider the cost of the VFD afterward installation.
  
  
• Complement the cost of mandatory additional apparatus for power factor alteration, noise sifting, etc.
  
  
• Compare costs and aids to control feasibility.

To appraise possible cost savings, consider the operating speed range. Pumping system features are well-defined by the system curve, which designates the flow rate at an exact pressure. To regulate the system curve, static and friction heads must be known.

To evaluate potential savings from condensed power consumption, consider the amount of time the pump runs at the dissimilar working points on the scheme curve. Times spent operating at lower flow rates and head compressions along the system curve provides the highest prospects for cost savings. Dissimilarities in the on-peak versus the off-peak price of electricity should also be determined.

Conclusion:

VSD decreases energy consumption, eradicates the need for a throttling valve, streamlines piping design and installation, and cuts maintenance costs. It is ideal to find a reliable variable speed drive manufacturer for buying the high and general-purpose VSD for your application.

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Created on Dec 10th 2020 06:30. Viewed 390 times.

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