Use of the VFD to minimize the throttling effect of the Hostel water supply system by the automation of the system PDFSanjay N. Huse, Ravindra D. Kale, Dr. D.R.Mane, Prof. V.P.DhoteThis paper presents the case study of the water supply of the hostels buildings of the Dr. Babasaheb Ambedkar Marathwada University Aurangabad. There are about fourteen individual buildings with approximately sixty four water tanks located on the terrace of the buildings and underground tanks to collect and store the water for the individual buildings. From these underground tanks the water is pumped to the terrace tanks through electrical pumps. Each tank inlet is provided with ball cock valve to close the water supply after the tank fills up. The different valves are generally in semi closed conditions which results in the throttling of the water flow and causes overloading of the motors and also eventually causes unnecessary tripping of the motors. This also results in throttling effect and causes additional power consumption to overcome. This throttling effect can be minimized and the extra power consumption can be saved by the application of the VFD for the pump motor and the automation of the water supply system. The use of the VFD drive and the automation of the water supply system results in the significant savings in both cost and GHG emissions. Also the automation will result in the reliability of the supply with the avoiding overflow of the water which also results in the water conservation. For motors used for driving the pumps, the consumption of the electrical energy is proportional to the cube of the flow rate. Therefore relatively small reduction in the flow rate may result in significant energy savings.
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