My Energy Consumption Over Three Days

As an exercise in estimation and in looking at energy consumption, I monitored my activities over three days. One of those days I went into Boston using bus and subway. I also did laundry and showered. Here is the break down of my estimations:

Electronics

Phone Charger (20 hours)

Laptop Charger (20 hours)

Speaker (10 hours)

Lights

-in dorm--50 hours

-classrooms/public spaces 50 hours (split with other classmates using it)

Heating/Cooling

shower water (1 hour)

Hot water boiler (2 hours)

AC/Heat (72+ hours)

Refrigeration (72 hours/number of students)

Oven heat (20 hours/number of students)

Washing Machine/Dryer: 4 hours

Fossil Fuel

Peter pan bus (2.5 hours)+5 trains (1.5 hours)

Unit: Joules

J/s=Watts

To find Joules: (Watts*sec)/# of people using it

Wattage estimation:

Electronics:

phone charger: 50W/hour-->20 hours-->72000 seconds

50W*72000s=3600000 Joules

Laptop charger: 100W/hour-->20 hours-->72000 sec

100W*72000s=7200000 Joules

Speaker: 20 W/Hour-->10 hours-->36000 sec

20W*36000s=720000 Joules

TOTAL: 11520000 Joules

Lights

Dorm: 60W-->50 hours-->180000 sec (split between 3 people)

(60W*180000s)/3=3600000 Joules

Classroom 60W*15000 light bulbs-->50 hours→ 180000 (split between 1000 people)

(60W*15000bulbs*180000s)/1000=162000000 Joules

TOTAL:165600000 Joules

Heating cooling:

Shower/water heater: 20,000 W/hour-->1 hour-->3600 sec

20,000W*3600s=72000000 Joules

Personal hot water boiler: 500 W/hour-->2 hour-->7200 sec

500W*7200s=3600000 Joules

AC/Heating: 40,000 W/hour-->72 hour-->259200 sec (split between 1000 people)

(40,000W*259200s)/1000= 10368000 Joules

Refrigeration: 700W/Hour-->72 hours-->259200 sec (split between 500 people)

(700W*259200s)/500=362880 Joules

Oven Heat:3000W/hour-->20 hours→ 72000 sec (split between 500 people)

(3000W*72000s)/500= 432000 Joules

Washing/Drying: 3000W/Hour→ 4 hours→ 14400sec

3000W*14400s=43200000 Joules

TOTAL: 129962880

Transportation

Peter Pan Bus (fossil fuel): 4000W/hour→ 9000sec (split between 50 people)

(4000W*9000s)/50=720000 Joules

Subway trains: 70,000W/hour→ 1.5 hours-->5400sec (split between 2000 people)

(70,000W*5400s)/2000=189000 Joules

TOTAL: 909000

TOTAL ENERGY CONSUMPTION OF ALL CATEGORIES:

307991880 Joules over 3 days (3x10^8 joules)