Microsoft Word - Assignmemt1_corrected MECH 3780/6480 ASSIGNMENT 1. DUE DATE: 11:59 pm, 12 August 2022 Required:  Hand-written is not acceptable. Graphs must be produced by Excel....

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Microsoft Word - Assignmemt1_corrected MECH 3780/6480 ASSIGNMENT 1. DUE DATE: 11:59 pm, 12 August 2022 Required:  Hand-written is not acceptable. Graphs must be produced by Excel. Explanation/analysis by Word. Submitted version in PDF format.  Font size (including the excel graph): 12, Font name: Times New Roman, Font color black. 1. A centrifugal pump with backward-curved blades has the measured performance given in Table 1 at speed of 1450 rpm. Tank A and B is large and open to air. The suction pipe has length L1, inner diameter D1, and friction factor 1; the discharge pipe has length L2, inner diameter D2, and frictional factor 2. The height between two surfaces is Z. These parameters are given in Table 2. Questions: a) Plot performance curves of the pump; (20 marks) b) Determine the operation point (Q, H, ) of the pump in the system, considering all the local and frictional losses. Local loss factor at the bend (b) is given in Table 2. Density of water is =998 kg/m3, g=9.81m/s2. (60 marks) Table 1 Q [l/s] 0.00 9.8 19.6 29.4 39.2 49 58.8 68.6 H [m] 35 35.5 35.5 35 34 32.3 30.2 28 P (W) 0 8734 10987 13432 16729 22136 29467 44775 Table 2 Last digit of Student number System ID Z L1(m) D1(mm) 1 b L2(m) D2(mm) 2 1 or 6 1 8 25 100 0.023 1.2 30 120 0.025 2 or 7 2 9 18 115 0.025 1.15 25 110 0.022 3 or 8 3 7 20 120 0.028 1.05 30 100 0.02 4 or 9 4 6 23 100 0.022 1.1 25 120 0.023 5 or 0 5 8 25 110 0.025 1.15 27 115 0.022 For example your student number is C1234567, your System ID is 2 2. An model pump delivering water at 60°C at 150 m3/h and 1450 rpm begins to cavitate when the inlet pressure (vacuum) and velocity are 0.8 at at and 6 m/s, respectively. Find the required NPSH of the pump. (20 marks).