Homework 5_ Solar Energy and Hydropower_ EGEE 101 (SP24 WC ONLINE MERGED)
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School
Pennsylvania State University *
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Course
101
Subject
Aerospace Engineering
Date
Apr 3, 2024
Type
Pages
3
Uploaded by tfjahjdhwjfhks
Homework 5: Solar Energy and Hydropower Due Mar 25 at 11:59pm
Points 100
Questions 6
Available Mar 11 at 12am - Apr 4 at 11:59pm
Time Limit None
Allowed Attempts Unlimited
Attempt History
Attempt
Time
Score
KEPT
Attempt 2
5 minutes
100 out of 100
LATEST
Attempt 2
5 minutes
100 out of 100
Attempt 1
9 minutes
65 out of 100
Score for this attempt: 100 out of 100
Submitted Mar 11 at 12:27am
This attempt took 5 minutes.
Question 1
20 / 20 pts
Correct!
Take the Quiz Again
The nearby town of Bellefonte, PA features the Gamble Mill, an old mill originally used to grind grain into
flour - 1800s hydropower. The mill dam, pond, millrace and tail race are still in place and functional. The
mill building is now a restaurant (currently for sale), but all the water-works are owned by the borough.
The municipal manager wants to put the system back to work as a small hydroelectric system to help
supply the borough's electricity. Does this idea make sense? How much power could this system
produce?
The height difference between the mill race and the tailrace is ten feet (3 meters), and the stream can
supply, on average, 100 cubic feet of water per second (2.8 m^3 / sec). The planned turbine would be
61% efficient under those conditions. Power (watts) = density of water * height * flow rate * acceleration
of gravity * coefficient of efficiency
NOTE: the coefficient of gravity is 9.81 for this problem
Don't round your answers.
50,266.44
Correct Answer
50,266 margin of error +/- 30
Question 2
20 / 20 pts
Correct!
81.46
Correct Answer
81.46 margin of error +/- 0.5
Question 3
20 / 20 pts
Correct!
3
Correct Answer
3 margin of error +/- 0.1
Question 4
15 / 15 pts
Correct!
0.51
Correct Answer
0.51 margin of error +/- 5%
If the system produces 48,486 watts, what is the energy worth per day? Assume electricity costs of
$0.07 per kWh.
If the system costs $105,884, how many years would it take to pay off the investment? Assume the
energy is worth $113 per day. Assume there are 309 operational days per year (the rest are
maintenance days).
In Arizona, photovoltaic (PV) panels can generate an average annual power of 1 MW/acre. If there are
305 sunny days per year in Arizona, but only 155 sunny days per year in Pennsylvania, how much
average power (in MW/acre) could the same PV panels generate in Pennsylvania? Please include two
decimal places in your answer. Note: assume that a cloudy day delivers 0 watts/acre of solar power. This
is not true, but it simplifies the problem for us.
Question 5
15 / 15 pts
Correct!
676.62
Correct Answer
677 margin of error +/- 5%
Question 6
10 / 10 pts
Wind energy
Correct!
Active solar
Correct!
Photovoltaic cells
Correct!
Solar thermal energy conversion
Correct!
Passive solar
Tidal power
Quiz Score: 100 out of 100
In Arizona, where there are 327 sunny days per year, it requires 329 acres of land to generate 300 MW
of average annual power. If there are only 159 sunny days per year in Pennsylvania, how many acres of
land would it require to generate the same average annual power? Please round to the nearest acre.
Note: assume that a cloudy day delivers 0 watts/acre of solar power. This is not true, but it simplifies the
problem for us.
What are the four types of solar energy utilization?
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