Fans and Blowers

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Fans and Blowers

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This session is intended to discuss the following:Types and working principle of fans and blowers, applications of various fans and blowers, pressure rise flow coefficient and efficiency Pressure rise, flow coefficient and efficiency, velocity triangles, performance characteristics, fan laws

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PEMP<br /> RMD 2501<br /> <br /> Fans and Blowers<br /> Session delivered by:<br /> Prof. Q H<br /> Prof Q.H. Nagpurwala<br /> <br /> 06a<br /> <br /> © M.S. Ramaiah School of Advanced Studies<br /> <br /> 1<br /> <br /> Session Objectives<br /> <br /> PEMP<br /> RMD 2501<br /> <br /> This session is intended to discuss the following:<br /> <br /> • Types and working principle of fans and blowers<br /> • Applications of various fans and blowers<br /> • Pressure rise flow coefficient and efficiency<br /> rise,<br /> • Velocity triangles<br /> • Performance characteristics<br /> • Fan laws<br /> <br /> 06a<br /> <br /> © M.S. Ramaiah School of Advanced Studies<br /> <br /> 2<br /> <br /> What is a Fan?<br /> <br /> PEMP<br /> RMD 2501<br /> <br />  Any device that produces a current of air by the movement of<br /> broad surfaces can be called a fan.<br />  Fans fall under the general classification of “turbomachinery”<br /> turbomachinery<br /> and have a rotating impeller at least partially encased in a<br /> stationary housing.<br />  Fans are similar in many respects to pumps. Both are<br /> turbomachines that transfer energy to a flowing fluid. It is easy to<br /> distinguish between fans and pumps: pumps handle liquids; fans<br /> handle gasses.<br />  Broadly speaking, the function of a fan is to propel, displace, or<br /> move air or gas.<br /> 06a<br /> <br /> © © M.S. Ramaiah School of Advanced Studies<br /> M. S. Ramaiah School of Advanced Studies, Bangalore<br /> <br /> 3<br /> <br /> Fans, Blowers and Compressors<br /> <br /> PEMP<br /> RMD 2501<br /> <br /> Fans, bl<br /> F<br /> blowers and compressors are diff<br /> d<br /> differentiated b the method used to<br /> i d by h<br /> h d<br /> d<br /> move the air, and by the system pressure they must operate against.<br /> Difference Between Fans, Blower and Compressors<br /> Difference Between Fans Blower and Compressors<br /> Equipment<br /> <br /> Specific Ratio<br /> <br /> Pressure Rise (mmWC)<br /> <br /> Fans<br /> <br /> Up to 1.11<br /> Up to 1 11<br /> <br /> 1136<br /> <br /> Blowers <br /> <br /> 1.11 to 1.20<br /> <br /> 1136 to 2066<br /> <br /> Compressors<br /> <br /> More than <br /> More than<br /> 1.20<br /> <br /> As per American Society of Mechanical Engineers<br /> (ASME) the specific ratio – the ratio of the<br /> discharge pressure to the suction pressure – is used<br /> for defining the fans and blowers<br /> 06a<br /> <br /> © © M.S. Ramaiah School of Advanced Studies<br /> M. S. Ramaiah School of Advanced Studies, Bangalore<br /> <br /> 4<br /> <br /> Components of Fan/Blower System<br /> <br /> PEMP<br /> RMD 2501<br /> <br /> Turning Vanes<br /> (typically used on<br /> short radius elbows)<br /> Outlet Diff<br /> O tl t Diffusers<br /> <br /> Provide air for<br /> ventilation and<br /> industrial<br /> processes that<br /> need air flow<br /> Filter<br /> <br /> Heat<br /> Exchanger<br /> Baffles<br /> <br /> Inlet<br /> Vanes<br /> Motor<br /> Controller<br /> <br /> Centrifugal Fan/Blower<br /> Belt Drive<br /> <br /> 06a<br /> <br /> Variable Frequency Drive<br /> Motor<br /> <br /> © © M.S. Ramaiah School of Advanced Studies<br /> M. S. Ramaiah School of Advanced Studies, Bangalore<br /> <br /> 5<br /> <br />
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