Implementation of Variable Frequency Drive on Underground Main Fans for Energy Savings—Case Study

Energy is a fundamental need for industries in every part of the world. The cost of electricity has increased significantly in the recent years and this trend is expected to continue in the coming years as well. Ventilation is a key component in the design and execution of all underground mine operations. Energy-efficient ventilation design is crucial for maintaining safe working conditions in underground coal or metal mines. Ventilation demand in metal mines may vary throughout the year, and a careful redesign of the ventilation system can optimize energy costs to a good extent. This paper investigates the potential for energy savings in underground metal mines by installing variable frequency drives (VFDs) on the main ventilation fans to provide variable control of airflow. VFDs are cost-effective, easy to control and require little maintenance. It has been found that significant amounts of electrical energy can be saved by installing VFDs on the main ventilation fans.