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Craig English Omar Hafez Krista Harris Jonathan Hopkins Nakhyun Kim

Craig English Omar Hafez Krista Harris Jonathan Hopkins Nakhyun Kim. Determining Inlet Guide Vane Setting on Centrifugal Fan to Minimize Power Consumption in Barn. Virginia Tech Mechanical Engineering. Fan used for experimentation is identical to the actual one used at Bridgewater.

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Craig English Omar Hafez Krista Harris Jonathan Hopkins Nakhyun Kim

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  1. Craig English • Omar Hafez • Krista Harris • Jonathan Hopkins • Nakhyun Kim • Determining Inlet Guide Vane Setting on Centrifugal Fan to Minimize Power Consumption in Barn Virginia Tech Mechanical Engineering Fan used for experimentation is identical to the actual one used at Bridgewater November 4, 2008 Inlet guide vanes (IGVs) increase efficiency by redirecting airflow entering the centrifugal fan

  2. overview of problem, experimental setup, and testing procedure • These slides are a walk-through of the problem, test setup, procedure, results, and conclusions Resulting effect of the inlet guide vanes (IGVs) on pressure rise and power consumption Recommendation for IGV setting and application of the results

  3. Refrigerator prevents milk spoilage • The combined power needs of the ventilation and refrigeration systems frequently trip the breakers Fan keeps cows healthy and happy http://www.dkimages.com/discover/previews/888/30040809.JPG http://cowhampshire.blogharbor.com/images/1_Holstein-Cow.jpg Induction motor powers these both http://www.engnetglobal.com/images/companies/Z/ZEI001_2108.gif power requirements depend on external temperature http://www.frontiernet.net/~salkire/seasons-change.jpg

  4. Flowrate at least 2000 CFM • Two requirements need to be met in order to make a proper IGV setting selection Power consumption reduced by 15% 15% reduction Selection made through test setup and appropriate analysis

  5. The experimental setup is a practical way of assessing various operating conditions • Flowrate at least 2000 CFM Power consumption reduced by 15% 15% reduction Selection made through test setup and appropriate analysis

  6. Wall mounted pressure transducer measures the static pressure Wattmeter measures fan power consumption Inlet guide vanes direct the flow into the fan Pitot tube measures dynamics pressure ATM conditions validate generalizations • Butterfly valve simulates barn response • The experimental setup is a practical way of assessing various operating conditions Direction of flow Butterfly valve Pitot tube Inlet guide vanes http://www.engineeringtoolbox.com/docs/documents/612/pitot_tube.png http://www.sinervalve.com/clip_image002.jpg Static pressure tap ATM conditions Wattmeter

  7. A flowchart is an effective way of describing the experimental procedure http://www.sinervalve.com/clip_image002.jpg http://www.engineeringtoolbox.com/docs/documents/612/pitot_tube.png

  8. No-slip condition • Several assumptions were made that were necessary for the simplification of the experiment Steady flow, inviscid,incompressible, along streamline Fully-developed flow http://www.engineeringtoolbox.com/docs/documents/612/pitot_tube.png Axisymmetric

  9. Radii • Plot power consumption versus flowrate • The volumetric flow rate was calculated by using the Bernoulli equation and the dynamic pressure data •  Pitot Tube •  Bernoulli equation http://www.engineeringtoolbox.com/docs/documents/612/pitot_tube.png •  velocities  flowrate Plot static pressure versus flowrate

  10. Analysis of the two graphs leads to a recommended inlet guide vane setting of 60%

  11. Investigated the use of inlet guide vanes • In summary, the power can be effectively be reduced by 15% through the use of inlet guide vanes Analyzed data and plotted them against the characteristic barn curve IGV setting of 60% met the twin objectives relieved overloading the motor maintained proper ventilation http://www.engnetglobal.com/images/companies/Z/ZEI001_2108.gif Questions?

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