Solution to HW4

81 ms 2 30 m 714 kgs m v 714 10 3 m 3 s 1000

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Unformatted text preview: m/s 2 7.85 kNm/s 7.85 kW W pump, u 7.85 kW 0.785 78.5% 10 kW W shaft 5-77 P V2 P1 V2 1 1 z1 hpump, u 2 2 2 z 2 h turbine, e h L 2g 2g g g hL P1 P2 (V12 V 22 ) g 2g 0.035 m 3 /s 0.035 m 3 /s V V V V where V1 2 1.98 m/s ; V 2 6.96 m/s 2 A1 D1 / 4 (0.15 m) 2 / 4 A2 D 2 / 4 (0.08 m) 2 / 4 1 kN/m 2 (1000 kg/m 3 )(9.81 m/s 2 ) 1 kPa 3.06 2.38 0.68 m hL (470 - 440) kPa 1000 kg m/s 2 1 kN 1.05[(1.98 m/s ) 2 (6.96 m/s) 2 ] 2(9.81 m/s 2 ) 5-81 P1 V2 P V2 1 1 z1 hpump, u 2 2 2 z 2 h turbine, e h L 2g 2g g g hL 1000 kg m/s 2 kN/m 1 kN (1000 kg/m 3 )(9.81 m/s 2 ) 2 2 hL P1 P2 g 0.204 m W pump, u mgh L Vgh L 1N (1000 kg/m 3 )(0.020 m 3 /s)(9.81 m/s 2 )(0.204 m) 1 kg m/s 2 5 1 W 1 N m/s 40 W...
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This document was uploaded on 02/05/2014.

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