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Chapter 4.6 - Fans and Blowers

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Selected questions Chapter 4.6: Fans and Blowers Short type questions 1. Mention the basic parameters that have to be measured during performance testing of a Fan. Ans. a. Static pressure b. Dynamic pressure c. Power input to the motor d. Cross sectional area of the duct. e. Temperature f. RPM of Fan 2. Define dynamic Pressure? Ans: 3. Dynamic Pressure is the rise in static pressure which occurs when air moving with specified velocity at a point is bought to rest without loss of mechanical energy. It is also known as velocity pressure Give the formulae to calculate volumetric flow by using Dynamic pressure and area. Ans. Volume Metric flow (NM /sec) = A Cp 2 9.81 P Where, A= Area of cross section of duct, m Cp= The picot tube coefficient (Take manufacturer s value or assume 0.85) P= The average velocity pressure measured using picot tube and inclined manometer by taking number of points over the entire cross-section of the duct, mm Water Column 4. Gas density, kg/m3 corrected to normal temperature Give the equation to calculate static efficiency of fan? Ans. 5. = Static Fan Efficiency = Volume in m / sec x total static pressure in mm WC 102 x Power input to the shaft in kW What is the relationship between static pressure, dynamic pressure and total pressure? Total pressure = Static pressure + Dynamic pressure 6. List at least three different flow control methods adopted in a fan system? Ans. The three important flow control methods are: Variable speed drives Change in Pulley size Inlet guide vane control 7. Give the formula to evaluate the velocity by using dynamic pressure for air system? Ans. Velocity (m/s) = Cp 2 g P Where, Cp : Pitot tube coefficient (take manufacturers value or assume 0.85) 4.6 - Fans and blowers (table format) 34

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