Benefits of site specific simulation models for assessing electrical energy savings potential on mine cooling systems

A simulation model was used to simulate and ascertain the electrical energy savings potential of a variable flow strategy on a mine cooling system. This strategy will be achieved by installing Variable Speed Drives (VSDs) on the Bulk Air Cooler (BAC) and refrigeration plant pumps. The simulation model was verified and updated by means of on-site testing. This is made possible by manually throttling supply valves to the BAC and refrigeration plant. The simulation model was updated using the results from the on-site tests. The updated model shows a 150 kW increase in predicted demand savings. There was little change to the spray pattern in the BACs and in turn no reduction in chilled air service delivery. This paper highlights the benefits of accurate specific simulation models and discusses some of the problems encountered during the testing of the simulations models.