fan ventilates at 500rev/min, the airflow is measyured at 150cubic meters/second. the ventilation pressure is 0.40kPa while thepressure along fan is0.85kPa.the mine requires 100cubic meters/second of air flow on an off day.efficiency=0.75. 1.new slow down speed required on an off day 2. Annual savings in electricty if the costs is R0.63/kWh 3. Comment on any savings in the maximum demand. 4. methods for reduction of speed on off-day.

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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.