There are some simple design considerations that will have an impact on energy or operating cost savings with minimal or no increase in first cost. The cost of variable frequency drives (VFDs) is approaching the cost of traditional motor starters. Originally the drives provided a means of saving energy because they would maintain a high level of efficiency while reducing motor speeds and using less power. These are traditionally used in variable air and water flow systems. However, use in some constant flow applications has proven this cost-effective in some circumstances: by using a VFD in lieu of a motor starter, you can save air balancing costs due to sheave and belt changes. This translates to low first cost, less labor, and maintained system efficiency.
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