Question

(3 pts) A power utility produces 500 g of CO2e per kWh of energy consumed. If using such a power facility to power up a computer, how much CO2e does the computer contribute during a year, assuming 240 working days annually and an average power of 30W during an 8-hour working day?

Answer 1

Given working days= 240 days

working time = 8 hrs per day

So, Total no of hours in a year = 8 * 240 = 1920 hrs

Average power consumption by computer = 30 W

Total energy consumption in kWh = $\frac{watts * time (hrs)}{1000}$ = $\frac{30 * 1920}{1000}$ = 57.6 kWh

1 kWh produces 500g of CO2e per year

Therefore, amount of CO2e produced by 57.6 kWh = 57.6 * 500 g = 28800 g

Hence, The computer contributes 28800 g ( or 28.8 Kg ) of CO2e in a year.