Solution to HW4

19 kgm 3 rt 0287 kpa m 3 kg k 50 273 k v v 0045

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1.13 kg/m 3 41.7 m/s 2 A D hole / 4 V1 V piston V hole V piston Apiston V hole Ahole V piston hole V hole 2 Apiston D piston / 4 V piston D hole D piston 2 2 V1 0.3 cm (41.7 m/s) 0.15 m/s 5 cm 5-69 (a) W pump, u pump-motor Welectric (0.70)(3 kW) 2.1 kW P P V2 V2 m 1 1 1 gz1 W pump m 2 2 2 gz 2 W turbine E mech,loss 2 2 E mech, loss E mech loss, pump E mech loss, piping and W pump, u W pump E mech loss, pump W pump, u mgz 2 W pump, u 1000 m 2 /s 2 7.14 kg/s 1 kJ gz 2 (9.81 m/s 2 )(30 m) 7.14 kg/s m V 7.14 10 3 m 3 /s 1000 kg/m 3 m (b) V3 2.1 kJ/s V V V V 7.14 10 3 m 3 /s 7.14 10 3 m 3 /s 1.86 m/s , V 4 3.64 m/s 2 2 A3 D3 / 4 A4 D 4 / 4 (0.07 m) 2 / 4 (0.05 m) 2 / 4 z3 = z4 , P P V2 V2 m 3 3 3 gz 3 W pump m 4 4 4 gz 4 W turbine E mech loss, pump 2 2 2 2 (V3 V 4 ) W pump, u P4 P3 2 V 2 2 (1000 kg/m3 )(1.0) 1.86 m/s 3.64 m/s 1 kN P4 P3 2 2 1000 kg m/s 4.9 294.1 kN/m 2 289.2 kPa 289 kPa 2.1 kJ/s 1 kN m -3 3 7.14 10 m /s 1 kJ 5-74 P P V2 V2 m 1 1 1 gz1 W pump m 2 2 2 gz 2 W turbine E mech,loss W pump, u mgz 2 E mech loss, piping 2 2 and W W E . E E E mech, loss mech loss, pump mech loss, piping pump, u pump Noting that E mech loss, piping mgh L , the useful pump power is 4 mech loss, pump W pump,u mgz 2 mgh L Vg ( z 2 h L ) pump 1 kN (1000 kg/m 3 )(0.025 m 3 /s)(9.81m / s 2 )[(25 7) m] 1000 kg...
View Full Document

Ask a homework question - tutors are online