Calculate your own energy use and carbon footprint. This should include food consumption, driving, electricity consumption and space heating. Calculate your total energy use/day and your carbon footprints/day and compare your numbers with the national average.
Units: 1Btu = 0.25kcal; 1therm = 25,000 kcal; 1 kwh = 850 kcal = 3600 kjoule; Burning of 1 gallon of gasoline produces 31, 470 kcal 1 kg of oil equivalent – 44,873 kjoules.
US energy Consumption (2005) = 10^17 BTU/year
Due Date : Thursday – February 25.
Addendum to Energy Audit
US Energy Use Per Year = 10^17 Btu
If 1 Btu = 1/4 kcal, then 1 kcal = 4 Btu
10^17 Btu / 4 Btu/cal = 2.5 x 10^16 calories per year (this accounts for entire US. Population)
To get per person value, divide by 300. To get per day, divide by 365.
2.5 x 10^16 calories per year/ 300 million people / 365 days = 228,310 calories/person/day
Average carbon footprint: 23 tons/year/person
Total number of g CO2/person/day = 14, 363 grams
1 ton =1000 kg
My Individual Carbon Footprint
14.363 kg x 365 days = 5242 kg/year = 5.24 tons/year/person
Compare 5.24 tons/year/person to 23 tons/year/person (significantly less)
Continuation of Janice Shen’s Energy Audit
Total number of g CO2/person/day = 15,700 grams
Total number of calories/person/day = 1640 + 44687 + 4463 = 50,790 calories
US ENERGY CONSUMPTION: 10^17 Btu
1 Btu = 0.25 kcal, so 1 cal = 4 Btu; 10^17 Btu / (4 Btu/cal) = 2.5 x 10^16 calories/ 300 million people / 365 days = 228,310 calories/person/day
Avg carbon footprint: 23 tons/year/person
1 ton =1000 kg
MY CARBON FOOTPRINT
15.7 kg x 365 days = 5730.5 kg/year = 5.73 tons/year
These are approximations!!!
Food Consumption:
approx. 1,100 calories a day
x 1 mol glucose/673 Cal = 1.63
x 6 mol CO2/1 mol glucose= 9.8
x 44 grams CO2/1 mol CO2= 431.5 grams CO2/day
Electricity:
(414 kWh/28 days/3 people) = 4.93 kWh/person/day
x 850 cal/kWh= 4,189.29
/210 cal/mol= 19.95
x 3.3 (limited efficiency) = 65.83
x 44g CO2/1 mol CO2=2,896.59 grams CO2/day
Heating:
Approx. 103.78 therms/30 days/4 people = .865 therms/day
X 25000 Cal/Therm = 21620.356
/210 Cal = 102.954
x 44g CO2/1 mol CO2= 4529.98 grams CO2/day
431.5 + 2,896.59 + 4529.98 = 7858.0693 g. of carbon
Vimal Bodiwala’s Carbon Footprint
Consumption of food:
(2600 cal/day) / (673 Cal/mol) = 3.87 moles of glucose
3.87 mols glucose x 6 moles CO2 x 44g/mol = 1019 grams CO2/day
Heating:
163 gallons of oil / (30 days x 5 people) = 1.09 gallons/person/day
(1.09 gal x 31470 cal/gal) / (1314 cal/mol) = 26 moles octane
26 moles x 8 moles CO2 x 44 g/mol = 9152 grams CO2/day
Electricity:
691 kWh/(30 days x 5 people) = 4.60 kWh/person/day
(4.60 kWh/person/day) x 850 cal/kWh = 3915.6 cal
3915.6 cal / (210 cal/mol) = 18.65 moles CO2
18.65 moles CO2 x 44 g/mol = 820 grams CO2
820 grams CO2 x 3.3 (limited efficiency) = 2706 grams CO2/day
TOTAL AMOUNT OF CARBON DIOXIDE
(grams CO2/day)
1019 g CO2/day + 9152 grams CO2/day + 2706 CO2/day = 12877 grams CO2/day
FOOD:
(2200 cal/day) / (673 Cal/mol) = 3.26 moles of glucose
3.26 mols glucose x 6 moles CO2 x 44g/mol = 860 grams CO2/day
HEATING:
110.9 gallons of oil / 30 days / 3 people = 1.23 gallons/person/day
(1.23 gal x 31470 cal/gal) / (1314 cal/mol) = 29.46 moles octane
29.46 moles x 8 moles CO2 x 44 g/mol = 10369 grams CO2/day
ELECTRICITY:
480 kWh/30 days/3 people = 5.33 kWh/person/day
(5.33 kWh/person/day) x 850 cal/kWh = 4533.33 cal
4533.33 cal / (210 cal/mol) = 21.58 moles CO2
21.58 moles CO2 x 44 g/mol = 949.8 grams CO2
949.8 grams CO2 x 3.3 (limited efficiency) = 3134 grams CO2/day
TOTAL AMOUNT OF CARBON DIOXIDE
(grams CO2/day)
860 g CO2/day + 10369 grams CO2/day + 3134 CO2/day = 14363 grams CO2/day
FOOD:
2498 calories/ day:
x 1 mol glucose/673 Cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
= 979.90 grams CO2/ day
DRIVING:
94.12 miles/week
/26 miles/1 gallon
/7 days/week
= .517 gallons gas/day
.517 gallons/day
x 1 gallon/20 pounds CO2
x 1 pound/454 grams CO2
= 4694 grams CO2/day
748 kwh/4 people/30 days = 6.23 kwh/person/day
x 850 calories/1kwh
x 1 mol CH4 /210 calories
x 3.3 (efficiency)
x 1 mol CO2/ I mol CH4
x 44 grams CO2/ 1 mol CO2
= 3,666 grams CO2/ person/ day
HEATING:
290.4 therms/30 days/4 people = 2.42 therms/person/day
x 25,000 calories/ 1 therm
x 1 mol CH4/ 210 calories
x 1 mol CO2/ 1 mol CH4
x 44 grams Co2/ 1 mol CO2
= 12,666 grams CO2/ person/ day
TOTAL:
979.90
4694
3666
12666
= 22,005.9 grams CO2/day
Food
(2600 Calories/day) x (1 mole glucose/673 Calories) = 3.86 moles glucose
3.86 moles glucose/day x 6 moles CO2/1 mole glucose = 23.18 moles CO2/day
23.18 moles CO2/day x 44g/1 mole CO2 = 1019.91 grams CO2/day
Electricity
72 kWh/30 days = 2.4 kWh/day
2.4 kWh/day x 850 Cal/1 kWh = 2040 Calories/day
2040 Calories/day x 1 mol CH4/210 Cal = 9.71 moles CH4
9.71 moles CO2 x 3.3 (efficiency)= 32.05 moles of CO2/day
32.05 moles of CO2/day x 44g of CO2/1 mole of CO2 = 1410.2 grams CO2/day
Heat
(this is very approximate because its averaged across my entire building, which has apartments of many different capacities)
107 Therms/30 days = 3.5 Therms/day
3.5 Therms/2 people = 1.75 Therms/person/day
1.75 Therms x 25000 Calories/Therm = 43,750 Calories/day
43,750 Calories/day x 1 mol CH4/210 Calories = 208.3 moles CH4
1 mol CH4/1 mol CO2 = 208.3 moles CO2
208.3 moles CO2 x 44 grams CO2 / 1 mol CO2 = 9,166.66 grams CO2/day
Total Energy Consumption per Day
1019.91 + 1410.2 + 9166.66 = 11596.77
Aidah Gross’s Personal Energy Audit
FOOD CONSUMPTION:
1300 calories/ day:
x 1 mol glucose/673 Cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
= 509.96 grams CO2/ day
DRIVING:
85 miles/week
x 14 miles/1 gallon
x 7 days/week
= .867 gallons gas/day
.867 gallons gas/day
x 1 gallon/20 pounds CO2
x 1 pound/454 grams CO2
= 7,872 grams CO2/day
ELECTRICITY:
2199 kwh/5 people/30 days = 14.66 kwh/person/day
14.66 kwh
x 850 calories/1kwh
x 1 mol CH4 /210 calories
x 3.3 (efficiency)
x 1 mol CO2/ I mol CH4
x 44 grams CO2/ 1 mol CO2
= 8,616.17 grams CO2/ person/ day
HEATING:
420 therms/30 days/5 people = 2.8 therms/person/day
420 therms
x 25,000 calories/ 1 therm
x 1 mol CH4/ 210 calories
x 1 mol CO2/ 1 mol CH4
x 44 grams Co2/ 1 mol CO2
= 14,666 grams CO2/ person/ day
TOTAL:
509.96 grams CO2/p/day
7,872 grams CO2/p/day
8,616.17 grams CO2/p/d
14,666 grams CO2/p/d
= 31,644.13 grams CO2/day
My carbon footprint is pretty huge because I actually need to drive to school at least 3 times a week! Do not judge! 🙂
Eva Raparia’s Carbon Footprint:
I- FOOD
1672 Cal/Day
x 1 mol glucose/673 Cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
————————————–
655.88 grams CO2/ day
II- HEATING (natural gas, methane CH4)
1.50 gal/person-day
x 31,470 Cal/ gal
x 1 mol C8H18/1314 Cal
x 8 mol CO2/1 mol C8H18
x 44 g CO2/1 mol CO2
————————————–
12,645.5 grams CO2/day
III- ELECTRICITY
(electricity is a secondary energy source; the primary energy source is CH4, methane)
7.8 kWh/ person-day
x 850 Cal/1 kWh
x 1 mol CH4/210 Cal
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
x 3.3 (30% limited efficiency)
————————————–
4595.1 grams CO2/ day
**TOTAL ENERGY CONSUMPTION & CARBON FOOTPRINT
(grams CO2/day)
Food consumption + Heating + Electricity
655.88 grams CO2/ day
+ 12,645.5 grams CO2/day
+4595.1 grams CO2/ day
————————————–
17,896 grams CO2/ day
[WORDPRESS HASHCASH] The poster sent us ‘718723051 which is not a hashcash value.
Oliver Lamb, and here’s the energy Audit:
Food Consumption:
2,724 Cal/day x 1 mole of glucose/673 Cal =4.05 moles per day
4.05 moles of glucose/day x 6 mol CO2/1 mole glucose = 24.29 moles of CO2/day
24.29 moles CO2/day x 44g/1 moles CO2 = 1,068.55 grams CO2/day
Electricity:
69.75 kWh/30 days = 2.325 kWh/day
2.325 kWh/day x 850 Cal/1 kWh = 1,976.25 Cal/day
1,976.25 Cal/day x 1 moles of CH4/210 Cal = 9.41 moles of CH4
9.41 mol CH4 x 3.3 (Energy just ain’t that efficient… it’s only a 30% return) = 31.37 moles of CH4/day
31.37 moles of CH4/day x 1 mole of CO2/1 mole of CH4 = 31.37 moles of CO2/day
31.37 moles of CO2/day x 44g of CO2/1 mole of CO2 = 1,380.24 grams of CO2/day
Heating:
I still don’t have heating in my Apartment… 🙁
The food I eat plus the Electricity I use:
1,068.55 + 1,380.24 = 2,448.79
Food:
1532 cal per day/673 cal→ 2.276 moles of glucose per day.
Multiply by 6 mol CO2 →13.656 moles of CO2 per day.
Multiply by 44 g CO2 →600.864 grams CO2 per day
Heating/Cooling:
~1866 therms per year/365=5.112 per day.
Divided by 6 people living at home = .852 per person per day.
Multiply by 25000 cal per therm→21300 cal.
Divide by 210 cals of CH4→101.429 moles of CH4 per day
Multiply by 1 mole CO2→101.429 moles of CO2 per day
Multiply by the 44 grams of CO2 per C)2 molecule→
4462.876 grams of C02 per day
Electricity:
~4401 kwh per year divided by 6 people in the family→733.5 per person per year. Divided by 12 months of the year →61.125 per person per month. Divided by 30 days of the month→2.038 kwh per day.
Multiply by 850 cals per kwh→1732.3 cal per day
Divide by 210 cals of one mol CH4→8.250 mol CH4
Multiply by 3.3→27.225 mol Ch4 per day
Multiply by 1 mol CO2→27.225 mol CO2 per day
Multiply by 44 grams CO2→
1197.9 grams CO2 per day
Transportation:
N/a, because I use public transportation/my feet/my bike.
Totals:
600.864 + 4462.876 + 1197.9 = 6261.64 grams of CO2 per day.
The average person in the US uses 20 tons C02 per year.
1 ton=907184.74 grams.
Multiply by 20 = 18143694.8 grams per year for the average American.
If I uses 1197.9 grams per day, multiply by 365,
then I use 437233.5 grams of C02 per year.
This is mostly approximate, since I don’t know the exact caloric content of most of my foods (how many calories in a slice of homemade bread? In salmon, since I don’t weigh it before eating?), and because my mom just threw out all the bills.
Brigida Pirraglia’s Personal Energy Audit
—————————————————————
Food Consumption:
(1450 kcal/1 person-day)(1 mol glucose/673 kcal)(6 mol CO2 /1 mol glucose)(44 g CO2 /1 mol CO2) = 568.80 g CO2/person-day
—————————————————————
Electricity:
(220 kWh)/((7 people)(30 days)) = 1.04762 kWh/person-day
(1.04762 kWh/1 person-day)(850 kcal/1 kWh)(1 mol CH4 /210 kcal)(1 mol CO2 /1 mol CH4)(44 g CO2 /1 mol CO2)(3.3) = 615.70 g CO2/person-day
—————————————————————
Heating:
(403 thms)/((7 people)(34 days)) = 1.69328 thms/person-day
(1.69328 thms/1 person-day)(25,000 kcal/1 thm)(1 mol CH4 /210 kcal)(1 mol CO2 /1 mol CH4)(44 g CO2 /1 mol CO2) = 8,869.56 g CO2/person-day
—————————————————————
Total:
568.80 g CO2/person-day + 615.70 g CO2/person-day + 8,869.56 g CO2/person-day = 10,054.06 g CO2/person-day
—————————————————————
—————————————————————
Compared to the National Average:
U.S. energy consumption (2005) = 10^17 BTU/year
(10^17 BTU/1 year)(0.25 kcal/1 BTU)(365.25 days/1 year) = 9.13 x 10^18 kcal/day
(1450kcal/1 person-day) + ((1.69328 thms/1 person-day)(25,000 kcal/1 thm)) + ((1.04762 kWh/1 person-day)(850 kcal/1 kWh)) = 4.47 x 10^4 kcal/day
U.S. daily energy consumption: 9.13 x 10^18 kcal/day
My daily energy consumption: 4.47 x 10^4 kcal/day
Energy Audit
Food Consumption: 1450 kcal/person-day
Electricity: (1.04762 kWh/1 person-day)(850 kcal/1 kWh) = 890.48 kcal/person-day
Heating: (1.69328 thms/1 person-day)(25,000 kcal/1 thm) = 42,332 kcal/person-day
Total: 44,672.48 kcal/person-day
—————————————-
My Energy Audit Compared to the National Average
U.S. energy consumption (2005) = 10^17 BTU/year
(10^17 BTU) / ((300,000,000 people)(365.25 days)) = 912,616.93 Btu/person-day
(912,616.93 Btu/person-day)((0.25 kcal)/(1 Btu)) = 228,154.23 kcal/person-day
My Energy Audit: 44,672.48 kcal/person-day
The Average American’s Energy Audit: 228,154.23 kcal/person-day
—————————————-
My Carbon Footprint Compared to the National Average
My Daily Carbon Footprint: 10,054.06 g CO2/person-day
(10,054.06 g CO2/person-day)(1 kg CO2 / 1,000 g CO2)(365.25 days/1 year)(1 ton CO2 / 1,000 kg CO2) = 3.67 tons CO2/person-year
My Annual Carbon Footprint: 3.67 tons CO2/person-year
The Average American’s Annual Carbon Footprint: 23 tons CO2/person-year
Lashika Yogendran’s Carbon Footprint.
(All calculations are for 1 person, since I live alone.)
—————————————————————-
Food Consumption:
1426 Cal/day x 1 mol glucose/673 Cal = 2.119 moles of glucose/day
2.119 mol glucose/day x 6 mol CO2/1 mol glucose = 12.714 moles of CO2/day
12.714 mol CO2/day x 44 g CO2/1 mol CO2 = 559.42 grams CO2/day
—————————————————————-
Heating:
28 therms/30 days = 0.933 therms/day
0.933 therms/day x 25000 Cal/therm = 23325 Cal/day
23325 Cal/day x 1 mol CH4/210 Cal = 111.071 mol CH4/day
111.071 mol CH4/day x 1 mol CO2/1 mol CH4 = 111.071 mol CO2/day
111.071 mol CO2/day x 44 g CO2/1 mol CO2 = 4887.12 grams CO2/day
—————————————————————-
Electricity:
160 kWh/30 days = 5.33 kWh/day
5.33 kWh/day x 850 Cal/1 kWh = 4530.5 Cal/day
4530.5 Cal/day x 1 mol CH4/210 Cal = 21.574 mol CH4
21.574 mol CH4 x 3.3 (for 30% limited efficiency) = 71.194 mol CH4/day
71.194 mol CH4/day x 1 mol CO2/1 mol CH4 = 71.194 mol CO2/day
71.194 mol CO2/day x 44 g CO2/1 mol CO2 = 3132.54 g CO2/day
—————————————————————-
Total Grams of CO2 Per Day:
Food Consumption + Heating + Electricity
Total = 559.42 g CO2/day + 4887.12 g CO2/day + 3132.54 g CO2/day
—————————————————————-
Total = 8579.08 grams of CO2/day
Don’t you get lonely?
hahaha sometimes! but i live in an apartment off campus, and i have friends in my building so i’m not really alone =]
Extension of Energy Audit:
# of grams of CO2/day = 8579.08 g/day.
# of Cal/day = 1426 Cal + 23325 Cal + 4530.5 Cal = 29281.5 Cal/day.
US Energy Consumption = 10^17 Btu
1 Btu = 0.25 Cal, therefore 1 Cal = 4 Btu.
10^17 Btu x 1 Cal/4 Btu = 2.5 x 10^16 Cal (US Consumption)
2.5 x 10^16 Cal / 300 million people / 365 days = 228,310 Cal/person/day (US Consumption)
Avg. carbon footprint = 23 tons/person/year
1 ton = 1000 kg.
8.579 kg x 365 days = 3131.335 kg/year = 3.13 tons/year
How I compare to the national average…
# of Cal of Energy:
228,310 Cal/day – 29281.5 Cal/day = 199,028.5 Cal/day
Carbon Footprint:
23 tons/year – 3.13 tons/year = 19.7 tons/year difference
I am way below the national average in both categories. Since I don’t own a car, I guess that’s what contributes to this big difference.
My Carbon Footprint:
Food:
1510 Cal/day
x 1 mol glucose/673 Cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
__________________________________
592.33 grams CO2/day
Heating: (natural gas, methane CH4):
142 therms/30 days = 4.73333 therms/day
4.73333 therms/4 people = 1.18333 therms/person-day
1.18333 therms/person-day
x 25,000 Cal/ therm
x 1 mol CH4/210 Cal
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
____________________________________
9603.17 grams CO2/day
Electricity:(electricity is a secondary energy source; the primary energy source is CH4, methane)
542 kWh/30 day = 18.1 kWh/day
18.1kWh/4 people = 4.517 kWh/person-day
4.517 kWh/person-day
x 850 Cal/1 kWh
x 1 mol CH4/210 Cal
x 3.3 (30% limited efficiency)
___________________________________
60.3342 mol CH4
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
___________________________________
2654.71 grams CO2/ day
Total energy consumption and carbon footprint
(grams CO2/day)
Food consumption + Heating + Electricity
592.33 grams CO2/ day
+ 9603.17 grams CO2/day
+ 2654.71 grams CO2/ day
_________________________________________________________________
12850.21 grams CO2/ day
Nora Curry: Personal Energy Audit/Carbon Footprint:
Part I: Food Consumption
1365 cal/day
x 1 mol glucose/675 cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
= 535.45 grams/CO2 per day
Part II: Heating
116 therms/30 days = 3.86 therms/day
3.86 therms/day/3 people = 0.965 therms/person/day
x 25000 cal/therm
x 1 mol CH4/210 cal
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
= 5054.76 grams/CO2/day
Part III: Electricity
520 kWh/30 days = 17.3 kWh/day
17.3 kWh/day/3 people = 5.77 kWh/person/day
x 850 cal/1 kWh
x 1 mol CH4/210 cal
x 3.3 (for inefficiency)
= 77.175 mol CH4
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
= 3395.68 grams/CO2/day
Total:
535.45 grams/CO2/day + 5054.76 grams/CO2/day + 3395.68 grams/CO2/day
= 8985.89 grams CO2/day
One correction– I accidentally wrote 675 cal instead of 673 cal in the food part, but the calculations were correct.
Energy Audit:
Food: 1365 cal
Electricity: 24,125 cal
Heating: 4904.5
Total: 1365 cal + 24,125 cal + 4904.5 cal = 30,394.5 cal
Compared to National Average:
10^17 Btu/year
10^17/300,000,000 people/365 days
=913,242 Btu/person/day
=228,310.5 cal/person/day
So my energy audit is 30,394.5 cal/day compared to a national average of 228,310.5 cal/day
Average carbon footprint = 23 tons/person/year
My carbon footprint = 8.99 kg/day
x 365 days
= 3,281 kg/year
= 3.28 tons/year
Sunny Liu’s Personal Energy Audit
Personal Energy Audit
FOOD CONSUMPTION:
1250 Cal/day
x 1 mol glucose/673 Cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
————————————–
490.34 grams CO2/ day
————————————————————–
HEATING (natural gas, methane CH4):
0.50 gal/person-day
x 31,470 Cal/ gal
x 1 mol C8H18/1314 Cal
x 8 mol CO2/1 mol C8H18
x 44 g CO2/1 mol CO2
————————————–
4,215 grams CO2/day
————————————————————–
ELECTRICITY:
(electricity is a secondary energy source; the primary energy source is CH4, methane)
5.00 kWh/ person-day
x 850 Cal/1 kWh
x 1 mol CH4/210 Cal
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
x 3.3 (30% limited efficiency)
————————————–
2,938 grams CO2/ day
————————————————————–
TOTAL ENERGY CONSUMPTION & CARBON FOOTPRINT
(grams CO2/day)
Food consumption + Heating + Electricity
490 grams CO2/ day
+ 4,215 grams CO2/day
+ 2,938 grams CO2/ day
————————————–
7,193 grams CO2/ day
Janice Shen’s Carbon Footprint
FOOD:
(1640 cal/day) / (673 Cal/mol) = 2.44 moles of glucose
2.44 mols glucose x 6 moles CO2 x 44g/mol = 643 grams CO2/day
HEATING:
169.9 gallons of oil / 30 days / 4 people = 1.42 gallons/person/day
(1.42 gal x 31470 cal/gal) / (1314 cal/mol) = 34 moles octane
34 moles x 8 moles CO2 x 44 g/mol = 11971 grams CO2/day
ELECTRICITY:
588 kWh/28 days/4 people = 5.25kWh/person/day
(5.25 kWh/person/day) x 850 cal/kWh = 4462.5 cal
4462.5 cal / (210 cal/mol) = 21.25 moles CO2
21.25 moles CO2 x 44 g/mol = 935 grams CO2
935 grams CO2 x 3.3 (limited efficiency) = 3086 grams CO2/day
TOTAL AMOUNT OF CARBON DIOXIDE
(grams CO2/day)
643 g CO2/day + 11971 grams CO2/day + 3086 CO2/day = 15700 grams CO2/day
My brother came home midway through last month, so I adjusted the heating and electricity to the average usage between six and seven people in the house.
FOOD
1171 calories a day / 673 cal * 6 mol * 44g
= 459 grams of carbon a day
HEATING
162 thermal units for 30 days = 5.4 thermal units a day
/ 6 people for 20 days, 7 people for 10 days = 0.775
0.9 for 66.6% and 0.771 for 33.3% of the time.
Average: (0.9 + 0.9 + 0.771) / 3
= 0.857 thermal units per person a day
* 25,000 cal / 210 cal * 44g
= 4489.05 grams of carbon a day
ELECTRICITY
507 kwh for 30 days = 16.9 a day
/ 6 people for 20 days, 7 people for 10 days
2.817 for 66.6% and 2.414 for 33.3% of the time.
Average: (2.817 + 2.817 + 2.414) / 3
= 2.683 kwh a person a day
* 850 cal / 210 cal = 10.858 mol
* 3.3 (for inefficiency)
= 35.833 mol
* 1 mol * 44g
= 1576.64 grams of carbon a day
TOTAL
459g + 4489.05g + 1576.64g
= My carbon footprint- 6524.69 grams of carbon a day
Please disregard the “= 0.775” in the second line of Heating- that was before I realized that I had to compensate for the change of household members.
Catherine Chan’s Personal Energy Audit
Personal Energy Audit
FOOD CONSUMPTION:
1356 Cal/day
x 1 mol glucose/673 Cal
x 6 mol CO2/1 mol glucose
x 44 grams CO2/1 mol CO2
————————————–
531.92 grams CO2/ day
————————————————————–
HEATING (natural gas, methane CH4):
134 therms/30 days = 4.46667 therms/day
4.46667 therms/4 people = 1.11667 therms/person-day
1.11667 therms/person-day
x 25,000 Cal/ therm
x 1 mol CH4/210 Cal
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
————————————–
5849.22 grams CO2/day
————————————————————–
ELECTRICITY:
(electricity is a secondary energy source; the primary energy source is CH4, methane)
537 kWh/30 days = 17.9 kWh/ day
17.9 kWh/4 people = 4.475 kWh/ person-day
4.475 kWh/ person-day
x 850 Cal/1 kWh
x 1 mol CH4/210 Cal
x 3.3 (30% limited efficiency)
————————————–
59.7732 mol CH4
x 1 mol CO2/1 mol CH4
x 44 g CO2/1 mol CO2
————————————–
2630.02 grams CO2/ day
————————————————————–
TOTAL ENERGY CONSUMPTION & CARBON FOOTPRINT
(grams CO2/day)
Food consumption + Heating + Electricity
531.92 grams CO2/ day
+ 5849.22 grams CO2/day
+ 2630.02 grams CO2/ day
————————————–
9011.16 grams CO2/ day
Extension of Energy Audit:
Personal:
# of grams of CO2/day = 9011.16 g/day.
# of Cal/day = 27,500 Cal + 1356 Cal + 3808 Cal = 32,664 Cal/day.
1 BTU = 0.25 Cal,
32664 Cal/day
x 1Btu/ 0.25 Cal
————————————–
130,656 BTU/ day
US Energy Consumption
10^17 BTU/ year/ nation
x 1 year/ 365 days
x 1 nation/ 300,000,000 people
————————————–
913, 242 BTU/person-day
Avg. carbon footprint
23 tons/person/year
x 1000 kg/ ton
x 1 year/ 365 days
————————————–
630 kg/ day-person or 630, 000 grams of CO2/ day-person
Comparison to National Average
# of BTU of Energy:
(national) 913,242
– (personal) 130,656
————————————–
(difference) 782,586 BTU/ day
Carbon Footprint:
(national) 630,000 grams CO2
– (personal) 9011.16 grams CO2
————————————–
(difference) 620,989 grams CO2/day
Comparing to the national average based on both amount of carbon and energy exhausted per day per person, I am significantly lower than the national average.
Hello…not quite sure if I did all this correctly, the heating and food portions were not too difficult, but I got a little confused with the electricity portion. If anyone notices any errors or has any recommendations/corrections please write me. Thanks!
ELECTRICITY
K/W used monthly = 700 k/w (6 People, 30 Days)
Per person, per day = 3.8 k/w
3.8kw x 850 Cal = 3230 Cals/day
3,230Cals ÷ 210Cals/m (methane) = 1.5 m/day
1.5m x 1m (carbon) = 1.5m of carbon daily
1.5 m x 44g = 66g of carbon daily
66g carbon x 3.3 (limited efficiency) = 217.8g of carbon daily
HEATING
Avg. Monthly heating bill = $230
82 gal/month (6 People, 30 Days)
Per person, per day = .45gal
.45 gal x 31,370cal/gal = 14,116.5 Cals/day
14,116.5 ÷ 1,314Cal/m = 10.7 m/day
10.7m x 8m (carbon) = 85.6 moles of carbon daily
85.6 m x 44g = 3766.4 g of carbon daily
DIET FOR FIVE DAYS
DAY FOOD CALORIES
2/11/10 Turkey Sandwich 361
Potato Chips 250
Edamame (2 cups) 200
Shrimp and Veg Tempura 320
Ice Cream (1/2 cup) 270
Daily Total 1401
2/12/10 Bacon, Egg, and Cheese 540
Cobb Salad 280
2 Chocolate Chip Cookies 440
Nature Valley Bar 180
Chicken and Veg Stir Fry 250
Daily Total 1690
2/13/10 Kellogg’s Cereal + Milk 350
2 Cups Green Grapes 124
Raviolis + Sauce 280
Eggplant Parmesan 504
Ice Cream (1/2 Cup) 270
Daily Total 1528
Daily Average: 1401
+ 1690
1528
4619 ÷ 3 = 1540 Calories
1540 Cals ÷ 673 Cal/mole (glucose) = 2.3 moles of glucose daily
2.3 m x 6 m (carbon) = 13.8 moles of carbon daily
13.8 m x 44g = 607.2 g of carbon daily
TOTAL:
217.8g (ELECTRICITY)
3766.4g (HEATING)
607.2g (FOOD)
_______________________________
4581.4g of Carbon Daily
I realized after comparing to Catherine’s energy audit that I made an error in calculating the electricity section. Here is my edit…
ELECTRICITY
K/W used monthly = 700 kWh (6 People, 30 Days)
Per person, per day = 3.8 kWh/day
3.8kWh/day x 850 Cal = 3230 Cals/day
3,230Cals / 210Cals/m (methane) = 15.4m/day
15.4m x 1m (carbon) = 15.4m of carbon daily
15.4 m x 44g = 677.6g of carbon daily
667.6g carbon x 3.3 (limited efficiency) = 2203.1g of carbon daily
NEW TOTAL:
2203.1g (ELECTRICITY)
3766.4g (HEATING)
607.2g (FOOD)
____________________
6576.7g of carbon daily
ENERGY AUDIT & CARBON FOOTPRINT COMPARED TO NATIONAL AVERAGE:
ENERGY AUDIT
ELECTRICITY: 10, 659 cal/day
HEATING: 14,116.5 cal/day
FOOD: 1,540 cal/day
_____________________________________
TOTAL: 26,315.5 cal/day
CARBON FOOTPRINT
4,581.1g of carbon daily
COMPARISON TO NATIONAL AVERAGE:
10^17 Btu/year
10^17/300,000,000 People/365 days
=913,242 Btu/Person/Day
=228,310.5 cal/Person/Day
My Energy Audit = 26,315.3 cal/Day, which is 201,995.2 cal/day less than the national average. This is a significant difference. I share a 4 bedroom apartment with 6 people and use exclusively public transportation. I would guess that these circumstances account for most of the disparity.
Average carbon footprint = 23 tons/person/year
My carbon footprint = 4,581.4g of Carbon Daily
= 4.58 kg of Carbon daily
x 365 days
= 1,671.2 kg/year
= 1.7 tons of carbon/year
My carbon footprint is also significantly less than the national average, about 21.3 tons less, presumably due to the aforementioned circumstances.