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.