Avoided Cost-Replacement of Older Variable Frequency Drive

At a large cheese and whey processing facility, a variable frequency drive (VFD) was being used to control a 700-hp vapor recompression fan on a multi-effect evaporator. The system had been in operation for more than 15 years and facility staff believed that newer, more efficient technology would justify replacement of VFD. Synchronized metering of the VFD indicated that it was performing well and that replacement on the basis of efficiency would provide no cost savings at all.

While installation of new technology is often justifiable, this relatively simple assessment saved the facility over $50,000 in estimated drive replacement costs.