“The World We Create” NATS 101 Section 6. Be aware! Cooperate! You will be asked to actively participate in the Debate today. . Remember , Project 1 due this Tuesday. 02/11. UNIT 1: Energy Sources, Conventional or Alternative ?. Alternative Sources. Our Focus.
Be aware! Cooperate!You will be asked to actively participate in the Debate today.
Remember, Project 1 due this Tuesday
Evaluate an alternative energy source considering a variety of factors such as:
Two different types of solar energy:
You’re building a new house, and are particularly concerned with “Going Green”, you’re thinking of installing Solar Panels.
How many do you need?
How much does it cost?
Is it worth doing?
1. Energy used per day:
(24 h) x (1.2 kWh / h) = 28.8 kWh
28.8 kWh x (1000 Wh / kWh) = 28,800 Wh
2. Energy generated per day In Tucson:
(5.4 h ) x (10 Wh / h / ft2) = 54 Wh / ft2
(total during Tucson’s daylight hours)
3. Square feet of solar panels needed:
(28,800 Wh) x (1 ft2 / 54 Wh) = 533 ft2 in Tucson
Again discuss with your group the following calculations (you have ~5 minutes) :
You have 5 minutes
4. Cost for a single home in Tucson:
(533 ft2) x ($56 / ft2) = $29,866
5. Cost over 20 years in Tucson:
($29866) x (100 cents / $1) = 2986666 cents
(total cost in cents) / (total energy requirements) =
(2986666 cents) / (210240 kWh) = 14.205 cents/kWh
6. Given all the data you have, would you install solar panels to operate your home? Why or why not?
7. What considerations did you have to think about in making your decision whether or not to install solar panels.
8. Which of your considerations did you value the most? Why?
You have 5 minutes
Renewable, availability, peak service, long-lasting, no emissions, low maintenance.
Cost, device efficiency, intermittency, storage.
However, when and where electricity is delivered is often more important than price.
Should we us Ethanol as an alternative Fuel?
Upon completion of all debates, you should be able to:
Energy Supply Pro
Pro Con Environment
Energy Supply Con
Moderator presents question
1 minute per initial response
30 seconds per rebuttal
Repeat for other side
Questions from other group members (time permitting)
Same rules apply from above
Take Notes (Hint, Hint)
Q#1: (Pros) If the U.S. stopped producing ethanol, how would it hurt our economy?
Q#2: (Cons) If the U.S. increased the production of ethanol, using current methods, how would it hurt our economy?
Q#1: (Cons) Using ethanol (as an alternative) has been reported to reduce pollution. Do you agree with this claim? Please elaborate
Q#2: (Pros) Would you say that ethanol use is good for the environment as a whole?
Q#1: Ethanol contains approximately 34% less energy per unit of volume than gasoline, and therefore burning pure ethanol in a vehicle would result in a 34% reduction in miles per gallon, why would we possibly want to use ethanol as an alternative fuel for gasoline?
Q#2: The U.S. produces most of its ethanol from corn what makes this way less efficient and effective than places like Brazil who produce their ethanol from sugar cane?
Dependence on Foreign Oil
Q#1: (Pros) In regards to our country’s “dependence,” why should our country invest in ethanol production?
Q#2: (Cons) Will production of ethanol be a means to an end of our “dependence?” Justify
We watched 4 different debates on whether or not we should use ethanol as an alternative source of fuel.
We heard differing opinions on those debates.
Those debating shared with us their reasons and justifications for their opinions.
Did your opinion (either for or against the use of ethanol as an alternative fuel source) change after watching or taking part in the debate? Please write it down individually on a piece of paper.
What’s something that you learned today from the debate?