International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2015): 6.391 Volume 5 Issue 5, May 2016 www.ijsr.net Licensed Under Creative Commons Attribution CC BY Energy Conservation in Air Supply Unit Used for Ventilation Purpose in Automobile Industries Prakash B. Salunkhe 1 , P. P. Mahajan 2 1 PG. Student, Department of Electrical Engineering, AISSMS Institute of Information Technology, Pune, Maharashtra, India 2 Assistant Professor, Department of Electrical Engineering, AISSMS Institute of Information Technology, Pune, Maharashtra, India Abstract: In the application of Air Supply Unit (ASU) high power rating three phase induction motor is used. The electric drive systems used in industrial applications are increasingly required to meet the higher performance and reliability. Today about 90% of all industrial motor applications use three phase induction motors because they are simple in design, easy to maintain, and are less costly than other designs. The traditional method of such flow control of ASU is use an induction motor run at constant speed with 50-Hz power supply and then control the flow by means of a throttle. As per the fan affinity law where the load torque and power vary with the square and cube, respectively of the speed. If reducing RPM by 10% decrease the power requirement by 27%. This change gives a large power reduction compared to fixed-speed operation. Relatively small reduction in speed gives large saving in energy consumption. Also by Using a variable frequency drive to control the air flow with a fully open throttle saves a considerable amount of power. The ASU does not need to be run at full speed throughout the day and therefore, a variable frequency drive can be employed to reduce the ASU motor speed. The main aim of this paper is to reduce the energy consumption by the implementation of VFD. Hence the proper control of air flows is achieved and increases the motor life. For the flow control with energy saving in centrifugal fan we propose to use variable speed drive. Keywords: Air supply unit, Centrifugal fan, Variable frequency drive, Fans law 1. Introduction Air Supply Unit (ASU) is equipment used in industry to circulate, supply or replace air. ASU is commonly known as Air Replacement Plant, Air Handling Unit, and Air Makeup Unit etc. ASU was very popular in areas where the air has low humidity, and hotter climate. Mainly ASU is required to comfort the human conditions in such climate. As technology has changed for better development, even in the field of paint and painting equipments, more and more expansions have added up to make a dust free painted product .To attain such a clean paint film on the product free from dust above 5 micron, ASU have become a necessity of today’s market. ASU uses the atmospheric air from outside, refines the air, and supplies it via ducting, thus creating a constant flow of dust free air. The volume of air supplied from the ASU also helps to maintain a positive pressure in the shop, thus not allowing external dust. ASU creates an enclosed environment safer for workers by facilitating the elimination of toxic fumes. ASU are not only used to provide make up air for the paint booth, but also used as a spot cooling device for the workers in molding and welding shops, assembly shops and other otter areas. Basically welding operation is carryon in weld shop, it produces lot of heat. Therefore atmospheric temperature is high, to reduce this temperature fresh ASU is required. As per area and temperature required ASU is installed at various locations. ASU is nothing but a centrifugal fan driven by high power three phase induction motor. Fans generate a pressure to move air against a resistance caused by ducts, dampers, or other components in a fan system. The fan rotor receives energy from a rotating shaft and transmits it to the air. Figure 1: Centrifugal Fan and Motor 2. Working of ASU ASU has three sections filter, motor and water spray section (see Fig-2). Inlet air is taking from atmosphere in filter section, it filtered air. These clean airs is suck by centrifugal fan and through in the water spray section with pressure. After this clean air is passed though water cooled cellular pad. This clean and cool air is dispatch to workstation through duct. Paper ID: NOV163444 737