2. The Cahora Bassa dam, located in Mozambique, is the highest dam in Africa. The hydroelectric...

2. The Cahora Bassa dam, located in Mozambique, is the highest dam in Africa. The hydroelectric facility within the dam generates an average 1,925 MWe. Nearly all of this electricity is exported to South Africa. The power station is linked to Pretoria, 1,420 km away, by a 533.0 kV high-voltage DC (HVDC) transmission line. a. The transmission line consists of eight cables made of aluminum with a steel core for strength and structural support. The total cross-sectional diameter of each cable is 28 mm, while the cross-sectional diameter of the steel core is 14 mm (consider the cross-sectional area as a steel circle in the middle of an an aluminum circle). Treat each cable as if it consisted of one steel and one aluminum resistor arranged in parallel, while the cables themselves are arranged in parallel with each other. What is the total resistance of the transmission line? Material resistivities:

ρ_steel=7.2〖*10〗^(-7) Ω•m

ρ_alum=2.7*10^(-8) Ω•m.

(15 points)

b. On average, how much current flows through the transmission lines? What is the power loss in the line? What is the percentage of power loss relative to the average power generated? (10 points)

c. If the power were transmitted at 333.0 kV over the same cables, what would the power loss percentage be? (10 points)

d. If the dam’s power is sold wholesale to South Africa for US$90.00/MWh, how much revenue would be lost per year, transmitting at 333.0 kV instead of 533.0 kV? (note: the 1,920 MW average production already accounts for the dam’s capacity factor) (5 points)

e. Say you are interested in doing a life cycle assessment to estimate the amount of energy used to build the Cahora Bassa power system, from dam to end user (not the amount energy produced by the system itself). Consider the major parts of the Cahora Bassa power system, from the dam, to the power lines, to the electrical equipment, and everything that was required to manufacture and build them. List ten energy-consuming materials or processes that would be used as inputs in a life-cycle assessment of the construction of this system. (10 points)

Expert Solution

genius_generous answered 2 years ago

The U.S. Department of Interior is planning to build a dam and construct a hydroelectric power...

The U.S. Department of Interior is planning to build a dam and construct a hydroelectric power plant. In addition to producing electric power, this project will provide flood control, irrigation, and recreational benefits. The estimated benefits and costs expected to be derived from the three alternatives under consideration are listed as follows: Design 1 - Initial invesment = $198 million - Annual recurring benefits = $37 million - Annual recurring costs = $15 million Design 2 - Initial investment =...

most developing countries such as South Africa, Zambia, Tanzania, Mozambique, Nigeria etc, are battling to contain...

most developing countries such as South Africa, Zambia, Tanzania, Mozambique, Nigeria etc, are battling to contain inflation at a desirable levels. on the other hand, some developed economies are battling with deflation. using relevant macroeconomic theories to support your arguments: a) write a detailed review of the challenges posed by deflation within an economy. your answer should cover all sectors including the business, government and the society as well as other macroeconomic indicators ( GDP, unemployment, interest rate etc.) (...

most developing countries such as South Africa, Zambia,Tanzania,Mozambique, Nigeria etc, are battling to contain inflation at...

most developing countries such as South Africa, Zambia,Tanzania,Mozambique, Nigeria etc, are battling to contain inflation at a desirable levels. on the other hand, some developed economies are battling with deflation. using relevant macroeconomic theories to support your arguments: a) write a detailed review of the challenges posed by deflation within an economy. your answer should cover all sectors including the business,government and the society as well as other macroeconomic indicators (GDP, unemployment, interest rate etc).

Africa has the highest rate of HIV in the world. Why is this the case? What...

Africa has the highest rate of HIV in the world. Why is this the case? What is it about the citizens of Africa that causes a higher rate? What other factors are responsible?

Q1. A hydroelectric power plant uses the reaction of ethylene (?2?4) with oxygen to generate vapour....

Q1. A hydroelectric power plant uses the reaction of ethylene (?2?4) with oxygen to generate vapour. The products of this reaction are carbon dioxide and water. Additionally, the reaction produces −1323.16?? per mol of ethylene consumed. a) How much ethylene is required by the power plant if 8500 kg of steam at 120 °C is produced in an hour? (assume 100% yield) (12.5 marks) b) Recalculate your answer for a 75 % yield. (12.5 marks) Assumptions. The heat capacities of...

1. Which is the earliest species of hominin to be found outside of Africa? 2. List...

1. Which is the earliest species of hominin to be found outside of Africa? 2. List a couple features of "archaic" Homo sapiens, as compared to Homo erectus 3. List a couple features of "archaic" Homo sapiens, as compared to modern humans. 4. What two groups of people made an appearance around 150,000 years ago

In fall of 2017, Sendy participated in infoDev’s XL Africa accelerator program and concluded a $2...

In fall of 2017, Sendy participated in infoDev’s XL Africa accelerator program and concluded a $2 million round of funding. Since its launch in 2015, Sendy has quickly grown into one of Africa’s top start-ups to watch and garnered attention from several investors. To date, the company has raised over $3 million in equity funding and has begun planning its expansion. Sendy’s platform works similarly to a taxi dispatch app, but focuses on moving packages instead of people. Last fall,...

2) As Africa slowly separated from Arabia, and the sea began to enter the rift, what...

2) As Africa slowly separated from Arabia, and the sea began to enter the rift, what kind of sediment would you expect to be deposited? Explain your reasoning. Write a 250 word essay to answer

Using JAVA Write a program that uses a 2-D array to store the highest and lowest...

Using JAVA Write a program that uses a 2-D array to store the highest and lowest temperatures for each month of the year. The program should output the average high, average low, and highest and lowest temperatures of the year. Your program must consist of the following methods with their appropriate parameters: a.) getData: This method reads and stores the data in the 2-D array. b.) averageHigh: This method calculates and returns the average high temperature of the year. c.)...

-Investigate the Mission, Vision, Values and Culture of 2 Higher Institutions located in 2 different countries...

-Investigate the Mission, Vision, Values and Culture of 2 Higher Institutions located in 2 different countries of your choice -Investigate the Mission, Vision, Value amd Culture of an University -Compare them

Question