The following figure shows a pump that extracts water from a reservoir with a volumetric discharge rate of Q L/s. Assume all losses are negligible. a) What would be the pressure at points A and B, when the pump-motor system extracts P kW from the electric grid. The combined efficiency of the pump-motor system is 60%. b) Draw the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) for this system. Q = 0.055 L/s; P = 20 kW B 1.2 m Atmosphere 3.0 m Diameter: 10 cm A Pump Diameter: 15 cm

The following figure shows a pump that extracts water from a reservoir with a volumetric discharge rate of Q L/s. Assume all losses are negligible. a) What would be the pressure at points A and B, when the pump-motor system extracts P kW from the electric grid. The combined efficiency of the pump-motor system is 60%. b) Draw the Energy Grade Line (EGL) and Hydraulic Grade Line (HGL) for this system. Q = 0.055 L/s; P = 20 kW B 1.2 m Atmosphere 3.0 m Diameter: 10 cm A Pump Diameter: 15 cm

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter18: Energy Storage

Section: Chapter Questions

Problem 20P

See similar textbooks

Similar questions

Water is pumped 14.5 km from a reservoir at elevation 30 m to another reservoirat elevation 70 m. The steel pipeline connecting the reservoirs has a nominal diameter of 1400mm (the actual inside diameter is 1372 mm) with C = 90. If the flow is 1.18 m3/s, the pumpingefficiency is 82%, and electricity costs $0.14/kWh. Assuming that the density of water is 1000kg/m3, what will be the monthly power bill? Sketch the hydraulic and energy grade lines.
In the figure shown, water (ν = 1 x 10-6 m2/s) flows at a rate of 5 L/s on a system of pipes. There are 40 m of 50-mm diameter pipe, 22 m of 150-mm diameter pipe, and 45 m of 75-mm diameter pipe, all cast-iron. There are two 90o elbows and an open globe valve. If the exit elevation is zero, determine the following:a) friction loss on each pipeb) total minor loss from the surface of the reservoir to the exitc) head extracted by the turbined) mechanical power extracted by the turbine
PROBLEM 5: A turbine, located at an elevation 255 m below that of the water surface at intake, carries a flow of 3.5 m^3/s. The head loss in the pipeline leading to it is 10 m. Find the horsepower delivered by the turbine if its efficiency is 92%. (746 watts = 1 HP). Illustrate the problem and show your complete solution.
A centrifugal pump discharging 10 lps against 25 m of head and operating with an efficiency of 60% requires 4.1 kW at 1000 rpm. What is the theoretical discharge if the speed is increased to 1500 rpm assuming the efficiency remains constant? What is the theoretical head and kW at 1500 rpm?
b) Water flows from a large reservoir through a pipe system which consists of 200 mm diameter ofpipe and 50 mm diameter of nozzle as shown in Figure 3. By neglecting all energy losses, calculate;(ii) Velocity and pressure at A
Explain the relationship between efficiency n ,head H, inflow power Pi and the best efficiency point (BEP) of a centrifugal pump.
Water flows from an upper reservoir to a lower one while passing a turbine as shown. 1. Compute the total head loss due to friction when the discharge is 150 lit/s. a. 4.25 m b. 3.84 m c. 5.67 m d. 2.54 m 2. Find the velocity of water. a. 2.05 m/s b. 4.12 m/s c. 3.06 m/s d. 6.57 m/s 3. Find the power input of the turbine. a. 213.5 kW b. 210.6 kW c. 115.2 kW d. 356.2 kW
Apply Hazen William’s Equation to the pumped system shown in the following figure, having a pumping head of 77 mwc. Determine diameter of the pipe to deliver a flow of Q =4000 m 3 /hr maintaining pressure of 50 mwc at the entrance of the city through a pipe of L =1200m having Hazen William’s roughness coefficient C=120. Also calculate increase in the flow when the pressure at the entrance of the city drop to 40 mwc.
A pump delivers water from a lower to a higher reservoir. The difference in elevation between thereservoirs is 10 m. The pump provides an energy head of 11 m and the frictional losses amounts to 0.7 m. If the pipe diameter is 250 mm, calculate thedischarge. *can you also provide its figure, Thank you.
A turbine, located at an elevation 255m below that of the water surface at intake, carries a flow of 3.5m^3/s. The head loss in the pipeline leading to it is 10m. Illustrate the problem and show your complete solution. Find the horsepower delivered by the turbine if its efficiency is 92%. (746 watts = 1 HP). Illustrate the problem and show your complete solution
What is the required pump power (Pa) for the system below? The source reservoir is on the right side of the figure The outflow is released as a water jet to the atmosphere (on the left) Discharge rate is 0.11 m3/s Pipe total length is 180 m Pipe diameter is 0.2 m Friction factor (f) is 0.01 Minor losses are negligibleCHOOSE ONE: 25 KiloWatt 169 KiloWatt 269 KiloWatt 112 KiloWatt
9.The pump shown delivers 115 li/s of oil, sg = 0.84, toreservoir D at elevation 72 m. The energy lost in thesuction line is 3.2 J/N and in the discharge line is 7.6 J/N. a.Compute the total head added by the pump. b.How many kW does the pump supply the system? c.If the pump is 85% efficient, how much power does it need?