PERSONAL/HOUSEHOLD ENERGY RESOURCE USE ASSESSMENT # 2
QUES. 1: Calculate the total amount of energy in BTU per capita used in the U.S.
82 x 1015 quads =
250 x 106 people
This large amount of energy represents 35 % of the energy used in the world by 5 % of the population.
QUES. 2: Name the major fossil fuel that supplies the majority of the energy in the U. S.
TRANSPORTATION - INVENTORY #1: Gallons of Gasoline Used:
How many cars are used in your family? ___________
Keep a record of all the gallons of gasoline purchased for all cars in the family for one month.
CAR # 1: _____ CAR # 2: ______ CAR # 3: ________
TOTAL GALLONS/MONTH: _________ TOTAL GALLONS/YEAR ___________
TOTAL GALLONS PER YEAR per person in the family
(divide by total family members including children) ____________
If one barrel of oil contains 42 gallons, how many barrels
of oil does each person in the family burn in gasoline per year?
BARRELS OF OIL as gasoline /YEAR ________
QUES. 3: First calculate the total barrels of oil consumed in one year.
QUES. 4: Calculate the barrels of oil consumed per capita in one year.
QUES. 5: a. Use the percent of gasoline (43%) to find the barrels of oil consumed as gasoline per capita per year. Percent is defined as "part" divided by the "whole" times 100. To solve for the "part": (43%/100) x ans. to QUES. 4)
b. Compare and comment on the per capita figure with that calculated in the Inventory # 1.
QUES. 6: a. How often do you walk, ride a bicycle, or ride public transit to work or the store?
b. Are there any life-style changes that you could make to use less gasoline? Explain.
INVENTORY 2: ELECTRIC LIGHTS IN YOUR HOUSE OR DORM ROOM & FLOOR
Week Night Lights: _________________ Week-end Lights _________________
NVENTORY 3: MONTHLY AND YEARLY USE OF ELECTRICITY
Month 1:
Month 2:
Month 3:
AVERAGE MONTHLY ELECTRICAL USE IN KW-HRS: ____________
Find the average for the 2 or 3 months and multiply by 12 to find the yearly usage of electricity.
AVERAGE YEARLY ELECTRICAL USE IN KW-HRS: ____________
AVERAGE YEARLY ELECTRICAL USE IN KW-HRS per person in family: ____________
QUES. 7: How many KW-HRS are consumed per person per year in the U.S.? Assume a population of 250 million (250 x 106).
QUES. 8: Compare this national average number with the yearly per person KW-HRS calculated for your house. Speculate on where the rest of the electricity is consumed to support society in general.
QUES. 9: Which is the major fuel used to generate electricity?
QUES. 10: From the percentage, calculate how many tons of coal per year are used to generate electricity.
QUES. 11: Calculate the tons of coal per capita and finally the TOTAL pounds of coal consumed per person per year.
QUES. 12: a. What is the major energy source for space heating? Which source do you have in your house?
b. What source of energy is used to heat water in your house? nat. gas or electric?
c. What source of energy is used for the clothes dryer? nat. gas or electric?
INVENTORY 4: Natural Gas or Fuel Oil for Space Heating:
Use your natural gas (or fuel oil) bills to find the cubic feet of natural gas used for an entire year. The number given must be multiplied by 100, since it is listed in 100s of cubic feet. One barrel oil = 7700 cubic feet natural gas equivalent.
CUBIC FEET NATURAL GAS/YEAR __________
QUES. 13: Interview a senior citizen, grand parent, relative (the older the better) to find out what energy source changes have occurred in the last 50-80 years. What was the major energy source for heating, lights, transportation in the 1920s or 1930s? Have there been intermediate changes in energy sources for the 1940s or 1950s?
QUES. 14: Based upon the energy inventories, list any specific life style changes that you can and will make to use less energy (specify the energy resource to be saved by your action). OR make the case that no changes are necessary.
INVENTORY 5: Carbon Dioxide Emissions
QUES. 15: (Optional - In Class) How much does each person contribute to the production of excess carbon dioxide by driving an automobile and using 1 gallon of gasoline to drive 20 miles?
An automobile burns gasoline in the combustion reaction. Although gasoline is a complex mixture of organic compounds, this problem will focus on one of them, octane - a hydrocarbon, (C8H18). Other information needed to solve the problem includes: 1 gallon = 4 quarts; 1 quart = 960 ml; density of octane = 0.69 g/ml
a. How many quarts in a gallon? (ans. 4 qt)
b. How many milliliters in a gallon? (ans. 3840 ml)
c. How many grams in a gallon? (ans. 2650 g)
d. The balanced combustion reaction for octane is:
2 C8H18 + 17 O2 ===> 16 CO2 + 18 H2O
e. What is the mole ratio of octane to carbon dioxide by reading balanced equation?
2 moles octane = 16 moles CO2
f. What is the molecular weight of octane? of carbon dioxide?
1 mole octane = 114 g; 1 mole CO2 = 44 g
g. Calculate the mass of carbon dioxide produced from 1 gallon of gasoline.
2650 g x 1 mole octane x 16 moles CO2 x 44 g CO2 = 8,182 g/gal or 8.18 kg/gal
114 g octane 2 moles octane 1 mole CO2
QUES. 16: How many kilograms of carbon dioxide do you personally produce in one year from gasoline?
_________
QUES. 17: Personal Total Carbon Dioxide Emissions per year:
To find the totals simply multiply the yearly totals from Inventories by the factors listed below.
Transportation:
Automobile: 8.18 kg carbon dioxide/gal. __________
Electricity:
Coal Fired Electrical Power Plant: 1 kg CO2 per 1 kilowatt hour __________
(Note: Commonwealth Edison uses nuclear power for about 60 % of its
electricity production, which does not produce any carbon dioxide)
Natural Gas:
Burning 1 cubic feet natural gas produces 0.062 kg carbon dioxide __________
Total Carbon Dioxide per year in kg _________