Concept explainers
The performance data of Problem 10.57 are for a 36-in.-diameter fan wheel. The fan also is manufactured with 42-, 48-, 54-, and 60-in.-diameter wheels. Pick a standard fan to deliver 600 ft3/s against a 1-in. water static pressure rise. Determine the required fan speed and input power required.
Performance data for a centrifugal fan of 3-ft diameter tested at 750 rpm are
Plot the performance data versus volume flow rate. Calculate static efficiency, and show the curve on the plot. Find the best efficiency point, and specify the fan rating at this point.
Want to see the full answer?
Check out a sample textbook solutionChapter 10 Solutions
Fox And Mcdonald's Introduction To Fluid Mechanics
Additional Engineering Textbook Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
Automotive Technology: Principles, Diagnosis, and Service (5th Edition)
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Degarmo's Materials And Processes In Manufacturing
Introduction To Finite Element Analysis And Design
- Calculate the disposition, pipe diameter and specific speed of a centrifugal pump, the impeller rotation speed of 1750 rpm, used in a sprinkler system with a pressure of 280 kPa, a friction loss of 3.5 m, a compressor velocity of 0.5 m, a static drawdown of 3 m at the bottom of the pump, and a static expulsion of 2 m at the top of the pump. The pump has a capacity of 6.35 kilowatts and an efficiency of 80%.arrow_forwardcomplete soln..arrow_forwardA centrifugal pump impeller has an external diameter of 1.2 m and internal diameter of 0.8 m. The width of the impeller at outlet is 0.175 m and the blade angle at outlet is 65 degrees. The flow velocities at inlet and outlet are the same (Va1 = Va2). This pump delivers 1.55 m3/s of water at 210 rpm. For theoretical performance, calculate: 1-The flow velocity . 2-blade speed at outlet. 3-blade angle at inlet (in degrees). 4-the developed head. 5-The pressure rise across the impeller. 6-The number of blades . 7-The NPSH . %3Darrow_forward
- 1. A pump pumping liquid propellant operates at 10,000 rpm. The volumetric flow rate through the pump is 5,000 gpm. The pressure drop across the pump is 750 psi. Propellant density is 71lbm/ft³. Calculate the head produced by the pump. b. Calculate the pump specific speed. Is this a high-performance pump or a low- performance pump? Calculate the input power to the fluid, i.e. the fluid horse power, fnp. а. С.arrow_forwardI need the answer as soon as possiblearrow_forwardA. A water jet of diameter 180 mm impinges on the buckets of a Pelton turbine having overall efficiency of 85% while operating under a net head of 500 m and at speed of 420 rpm. Find the specific speed of the turbine. Take coefficient of velocity of the jet as 0.98 and speed ratio as 0.46. B. The pitch circle diameter of a Pelton wheel is 0.9 m. A jet of water of diameter 80 mm gets deflected by an angle of 170° when it impinges on the buckets. The bucket friction coefficient and coefficient of velocity of jet can be taken as 0.93 and 0.97 respectively. If the net head available on the wheel is 500 m and speed ratio is 0.45, calculate (a) the power transferred to to the wheel by the jet, (b) hydraulic efficiency, and (c) specific speed of the turbine. Take mechanical efficiency of wheel as 0.9.arrow_forward
- Solve the problem given in image. Assume any data if it is missing.arrow_forwardA centrifugal pump was designed for a 1940 rpm operation and a head of 63.4 m has a capacity of 201.2 l/s (lps) with a power of 135. kW. What effect will a speed reduction to 1200 rpm have on the head, capacity and power input of the pimp? What will be the changes in these variables if the impeller diameter is reduced from 332.5 mm to 275 mm while the speed is constant at 1800 rpm? Required a. For D = c, find Q2, H2 and P2 b. For N = c, find Q2, H2 and P2arrow_forwardAn idelaized centrifugal pump, data given as follows; Blade outer radius of blade = 40 mm Power = 1 KW Running speed = 2000 rpm Entry of liquid into the pump is axial and exit from the pump is radial with respect to impeller. Determine the mass fow rate of the liquid through the pump?arrow_forward
- It is desired to deliver 5gpm at a head of 640ft in a single stage pump having a specific speed not to exceed 50. If the operating speed is not to exceed 1352 rpm. How many stages are required? Select the correct response: 4. 5. 3 2.arrow_forwardComplete the following tasks: QUESTION 1: A centrifugal pump consists out of an impeller, diffuser and casing and is powered by 300 kW (shaft power) and rotates at 96.3 rad/s. The flow rate generated by the machine is 54.7 Kilo-litres/min. The impeller blade inlet angle and width is 23° and 180 mm respectively. The blades occupy 12% of the impeller area and the water is assumed to enter the impeller radially. Suction and delivery pipes are equal in size. Determine: 1.1. The impeller inlet (i) diameter and inlet blade velocity. (Hint - Substitution: Vn in terms of Di and U, in terms of D; both sub into Tan of Blade inlet angle, only unknown is then solving for D?) ANS: 300 mm; 14.42 m/s If the pump has a mechanical efficiency of 80%, calculate the blade velocity at outlet (Uo) and outlet whirl velocity Vwo. Assume the blade exit angle equal to the guide vane angle. (Hint - Substitution: Write Vwo in terms of U. sub in Euler equation only unknown then is solve for Vwo) ANS: Vwo = 11.54…arrow_forwardFigure below shows the performance curve family of Model 5009 Centrifugal pumps of Taco Pump Inc., running at a fixed speed of N = 1160 rpm. For the pump with the impeller diameter D = 8.625 in., calculate the power coefficient (Cp*) of the given pump at BEP if water is the fluid. HEAD IN FEET 0000 50 40 20 10 8.625" 30 (219mm). 0 O 0.821 O 0.731 O 0.467 aco 10 O 0.235 L/SEC 5 9.25" (235mm) 8.00" (203mm) 7.375" (187mm) 6.75" (171mm) 125 Model 5009 FI & CI Series 25 15 20 -do CURVES BASED ON CLEAR WATER WITH SPECIFIC GRAVITY OF 1.0 72% 75% 30 79% 1160 RPM FEBRUARY 19. 2002 40 3,5 45 REQUIRED NPSH 1.5HP (1.1KW) 79% 1⁰⁰ of 15² Curve no. 2140 Min. Imp. Dia. 6.75" Size 6 x 5 x 9.0 50 55 60 250 375 500 625 FLOW IN GALLONS PER MINUTE 72% 2HP(1.5KW) colo & 2⁰. It & SC- 09. 55% 5% 3HP (2.2KW) 7.5HP(5.6KW) 45% de 750 875 NGFEET 15 12 -9 -6 3 0 10 8 50 SHP(3.7KW) NPSH HEAD IN METERS 1000 r45 36 F27 18 -9 0 -100 --80 4 -40 -60 2 -20 -O HEAD IN KILOPASCALSarrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY