Pumped storage is receiving increased attention, as it is a cost-effective approach to store excess electricity...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Pumped storage is receiving increased attention, as it is a cost-effective approach to store excess electricity generation (e.g. during the day from Photovoltaics) and to release this energy during the evening, when demand is highest. For Brisbane, a storage scheme is proposed, which has a reservoir on Mt Cootha, and a pumping/turbine station in Indooroopilly, so that water from the Brisbane river can be used. The pipe connecting the reservoir and turbine has a diameter of 2 m and wall roughness of 2 mm and is 2.5 km long. The pressure in the pipe at point A, a short distance after exit from the reservoir, at an altitude of 300 m, is 250 kPa (absolute). The pressure at point B, just before the inlet to the turbine, at an altitude of 15 m is 2500 kPa. a) In 2-3 sentences, explain why the water flows from point A at low pressure to point B at high pressure. b) Find the flow rate of water in the pipe. Hint: for part (b) you need to iterate as friction factor f and thus frictional head loss hr depend on flow rate. Use an initial guess for the friction factor of 0.02. Substitute this estimation of friction factor into the head equation and solve for velocity V, then calculate a value for f using Haaland's formula. After 2-3 iterations you should find that f and V have converged. Pumped storage is receiving increased attention, as it is a cost-effective approach to store excess electricity generation (e.g. during the day from Photovoltaics) and to release this energy during the evening, when demand is highest. For Brisbane, a storage scheme is proposed, which has a reservoir on Mt Cootha, and a pumping/turbine station in Indooroopilly, so that water from the Brisbane river can be used. The pipe connecting the reservoir and turbine has a diameter of 2 m and wall roughness of 2 mm and is 2.5 km long. The pressure in the pipe at point A, a short distance after exit from the reservoir, at an altitude of 300 m, is 250 kPa (absolute). The pressure at point B, just before the inlet to the turbine, at an altitude of 15 m is 2500 kPa. a) In 2-3 sentences, explain why the water flows from point A at low pressure to point B at high pressure. b) Find the flow rate of water in the pipe. Hint: for part (b) you need to iterate as friction factor f and thus frictional head loss hr depend on flow rate. Use an initial guess for the friction factor of 0.02. Substitute this estimation of friction factor into the head equation and solve for velocity V, then calculate a value for f using Haaland's formula. After 2-3 iterations you should find that f and V have converged.
Expert Answer:
Answer rating: 100% (QA)
a Water flows from point A at low pressure to point B at high pressure because it follows the natura... View the full answer
Related Book For
Financial Reporting Financial Statement Analysis and Valuation a strategic perspective
ISBN: 978-1337614689
9th edition
Authors: James M. Wahlen, Stephen P. Baginski, Mark Bradshaw
Posted Date:
Students also viewed these accounting questions
-
IV. Disturbance Accommodating Controller (DAC): Use the same (A,B,C) as in Problem II. (x=. =Ax+ Bu+Tup Let [up=0zD with Disturbance Generator &r= y=Cx ZD=FZD = a) Let u, sint+, cost (sint & cost)....
-
The demand for electric power is usually much higher during the day than it is at night, and utility companies often sell power at night at much lower prices to encourage consumers to use the...
-
The demand for electric power is usually much higher during the day than it is at night, and utility companies often sell power at night at much lower prices to encourage consumers to use the...
-
A horizontal jet of water (at 10C) that is 6 cm in diameter and has a velocity of 20 m/s is deflected by the vane as shown. If the vane is moving at a rate of 7 m/s in the x-direction, what...
-
Molecules Condensed Matter How many protons and how many neutrons are there in a nucleus of the most common isotope of (a) Silicon 2814Si; (b) Rubidium 8537Rb; (c) Thallium 20581?
-
An archaeological dig turns up large numbers of pottery shards, broken stone tools, and other artifacts. Students working on the project classify each artifact and assign a number to it. The counts...
-
With reference to Exercise 3.25, suppose that three of the spark plugs are defective. In how many ways can 4 spark plugs be selected so that (a) one of the defective plugs is selected; (b) two of the...
-
On September 18, 2014, Gerald received land and a building from Frank as a gift. Frank's adjusted basis and the fair market value at the date of the gift are as follows: No gift tax was paid on the...
-
J. Clancy owns Clancy Consulting. On December 31 of the prior year, the Retained Earnings account balance was $27,000. During the current year, the company paid $13,800 in cash dividends. Clancy...
-
Create and insert an ERD showing the constellation ERD schema below. Please see requirements in the next two sections. Determine four to five (non-date/time) dimension tables a. SCDs need to be...
-
Let F be a pseudorandom function and G be a pseudorandom generator with expansion factor p(n) = n +1. Suppose the shared key is a uniform k = {0,1}. (a) Consider an encryption scheme as follows. To...
-
Explain how a hospital CEO could be guilty of healthcare fraud? Explain
-
Tom is an ex-convict who served time for murder twenty-five years ago. He is now a reformed citizen living an outstanding life in a new community. Bill finds out about Tom's past and lets everyone...
-
in your opinion does the "conduit theory" promote law office efficiency and better client relationships? If so, how? If not, why not
-
It takes the same amount of time to double all three accounts ($100, $200, $500). All three accounts take 13.863 to double We can determine that the starting amount is irrelevant because any starting...
-
Determine the factory overhead application rates for each department. (b) Compute the cost to be assigned to the Washington County job. The job had been bid to the customer at a sales price of $35...
-
20. Choose the bond below that is most polar. A) H-I B) H-Br H-F D) H-CI E) C-H 21. Choose the best Lewis structure for CH2C12. A) H-8-8-8-H B D) E) H Co H H-H---: D) +2 E) +3 H CICIE H 22. Identify...
-
Find a polar equation for the curve represented by the given Cartesian equation. 4y 2 = x
-
Texas Instruments (TI) designs and manufactures semiconductor products for use in computers, telecommunications equipment, automobiles, and other electronics-based products. The manufacturing of...
-
Alpha Computer Systems (ACS) designs, manufactures, sells, and services networked computer systems; associated peripheral equipment; and related network, communications, and software products....
-
All leases for financial reporting purposes are treated as either capital (finance) leases or operating leases. The effects of the two reporting techniques on the financial statements differ...
-
In the winter sport of curling, two teams alternate sliding 20 kg stones on an icy surface in an attempt to end up with the stone closest to the center of a target painted on the ice. During one...
-
The acceleration of the spacecraft in which the Apollo astronauts took off from the moon was 3.4 m/s 2 . On the moon, g = 1.6 m/s 2 .What was the apparent weight of a 75 kg astronaut during takeoff?
-
A vendor at the local art fair ties her tent to the concrete-filled coffee can shown in Figure P5.34. A stiff breeze comes up and the string becomes taut. What is the maximum value that the string...
Study smarter with the SolutionInn App