AOS2 Assignment 2OL W21 (1)
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School
University of California, Los Angeles *
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Course
2
Subject
Aerospace Engineering
Date
Jan 9, 2024
Type
Pages
4
Uploaded by CoachOxide5237
AOS 2 Assignment 2 W21
ONLINE VERSION
1
AOS 2: Air Pollution
Online Discussion Assignment #2, Week 3
Name____________________________________________
ID#_______________________
Name____________________________________________
Rating: _____
Name____________________________________________
Rating: _____
Name____________________________________________
Rating: _____
Section (time/day)__________________
Scan (or complete electronically) this assignment and upload to the CCLE site as soon as possible
after the end of the discussion section (or hand in the hardcopy to a TA). Remember to put
everyone’s name on this sheet (your name and ID goes at the top) and rate everyone’s level of
participation. Feel free to discuss the questions among yourselves or with the instructor.
In this assignment we will try to estimate how much
you
contribute to the emission of carbon
dioxide, CO
2
.
CO
2
is emitted every time you use electric energy, drive your car, use hot water, etc.
Fill out the worksheet on the next page. Estimate the average for your group, or calculate it by
writing down the contribution of every member of your group and divide it by the number of
group members.
Example
: Computing the group average of miles driven per year:
Miles driven per year
Student 1
10,000
Student 2
5,000
Student 3
20,000
Student 4
1,000
Total miles for all students (add up all the individual miles)
36,000
Average between 4 students (divide by 4)
36,000
÷
4 = 9,000
Once you filled out the worksheet, discuss and answer the questions on the last page
1 No video, no audio
2
3
4
5 Adequate participation
6
7
8
9 Dominated the activity
AOS 2 Assignment 2 W21
ONLINE VERSION
2
Suggestions for automobile carbon footprint calculation
Miles driven per year: Include all miles traveled by motor vehicles, including when you are a
passenger (you may divide by the number of occupants if you are frequently in a multi-occupant
vehicle, except for Uber/Lyft, where you must not count the driver as an occupant). For
significant travel by bus, use an average load of 20 passengers (so divide by 20, but use 4 mpg for
the fuel economy of the bus). The number for this factor does not need to be particularly accurate;
a rough estimate is adequate.
An average of 20 mpg is good enough for conventional automobiles (city/highway driving,
mostly city). Use higher values if you primarily travel in a hybrid electric car (ex., ~50 mpg for a
Prius). Full-electric vehicles may use the equivalent fuel mileage of 150-180 mpg. Public transit
buses should be 4 mpg.
Suggestions for electricity usage:
Refrigerators do not run for 24 hours per day; the compressor may run for only about 10-15 hours
per day, depending on ambient temperature and age of the refrigerator.
Assume electric space heating, even if your furnace actually runs on natural gas. The AC/heating
is an annual daily average, so if you only have heating and no AC, you will need to estimate how
much the furnace runs per day (usually 12-16 hours/day) during the 90-day heating season instead
of a 365-day year.
If you primarily eat food cooked by others (take-out, delivery, residence hall dining commons,
etc.), make an estimate of how long it would have taken you to prepare these meals for yourself
each day. As with space heating, use the electric usage for cooking even if your stove/oven runs
on natural gas.
Suggestions for gas usage:
Assume you use natural gas for water heating, even if your water heater is electric or you have
electric on-demand heating near each set of faucets. This still applies even if your hot water
comes from a common source, such as a building water heater.
Suggestions for garbage disposal:
Do not include recycled mass in your discarded garbage, even though recycling is nowhere near
100% efficient in reducing the carbon footprint.
AOS 2 Assignment 2 W21
ONLINE VERSION
3
CO
2
Worksheet
(see previous page for suggestions regarding some line items)
kg CO
2
emitted
per year
Yours
Group
average
Automobile:
______ miles driven per year
÷
_____ mpg (mileage of car) = __________ gallons fuel used per year.
__________ gallons fuel used per year
´
9 kg CO
2
emitted per gallon fuel = _____________ kg CO
2
/ year
Airplane:
______ miles traveled per year
´
0.5 kg CO
2
emitted per mile = __________ kg CO
2
/ year
Electricity:
_____ h refrigerator use per day
´
0.15 kWh per hour
´
365 days/year
= _______ kwh / year
_____ h TV per day
´
0.2 kWh per hour
´
365 days/year
= _______ kwh / year
_____ h Computer per day
´
0.2 kWh per hour
´
365 days/year
= _______ kwh / year
_____ h light per day
´
0.2 kWh per hour
´
365 days/year
= _______ kwh / year
_____ h A/C or heating per day
´
2 kWh per hour
´
365 days/year = _______ kwh / year
_____ h cooking per day
´
2.5 kWh per hour
´
365 days/year
= _______ kwh / year
sum of all uses ________ kwh / year
´
0.6 kg CO
2
per kwh = _________kg CO
2
/ year
Gas
_____ h hot water (shower,washer, etc) per day
´
(0.4 therms / hr)
´
(365 days/year)
= _________ therms / year
_________ therms / year
´
(6 kg CO
2
/ therm) = __________kg CO
2
/ year
Garbage
_______ lbs of trash discarded per day
´
1.5
kg CO
2
per lbs trash
´
365 days/year = _________kg CO
2
/ year
Sum
sum of all the CO
2
emissions you calculated
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AOS 2 Assignment 2 W21
ONLINE VERSION
4
1.
Multiply the kg of CO
2
you emit per year with the population of the Earth (7.7 billion) to
calculate the total global annual CO
2
emission if every person lived your lifestyle.
2.
Compare this number with the current total anthropogenic global annual CO
2
emission of
3.7
´
10
13
kg CO
2
/ year. Is this number larger or smaller than the one you calculated in (1)?
Explain why the numbers are different.
3.
List three things that you could do to reduce your CO
2
emissions. [relative to your carbon
emission allocations]