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March 2011 -
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Many pumping applications with variable-duty requirements offer great potential for savings, which often go well beyond energy costs. These savings can include improved performance, increased reliability, and reduced life-cycle costs.
Most existing pumping systems that require flow control use bypass lines, throttling valves, or pump-speed adjustments. The most efficient of these strategies is pump-speed control, which managers can implement in a number of ways.
Most rotodynamic pumps in service today are oversized — many are more than 20 percent oversized. So retrofitting many of these systems with VSDs could help to match systems to actual load requirements more accurately and save energy.
VSDs offer several benefits for facilities. Some benefits are relatively easy to quantify, while others are less tangible. They include:
Pumping Systems: How to Calculate Life-Cycle Costs
Pumping Systems: Variable-Duty Requirements Bring Savings
Eight Symptoms of an Inefficient Pumping System
Two Methods for Analyzing Pumping Systems