Question

QUESTION 2 A medium-growth coniferous tree planted in an urban or suburban setting after being raised in a nursery for 1 year can sequester 10.5 Kg of CO2 over a 10-year period of growth. If you lived in an average home in Australia, how many trees would you need to plant to remove the CO2 you would produce from driving your car, using electricity in your home using natural gas heating for a period of 10 years? In order to answer the question you may need to make use of the following data: a. Average household energy use is 24 kWh per day. b. 20% of household energy use is due to gas heating. . The calorific value of natural gas is 10 kWh/kg ii. Natural gas has specific carbon dioxide emissions of 0.2kgCO2/kWh c. The distance travelled by car per annum is 20,000 km i. The car's fuel efficiency is 0.1 lt/km ii. The engine's efficiency is 20%. i. The calorific value of petrol is 10 kWh/lt iv. Petrol has specific carbon dioxide emissions of 0.25 kgCO2/kWh d.Electricity if produced from coal i. The power station and transmission efficiency is 35% ii. The calorific value of coal is 8.4 kWh/kg ii. Coal has specific carbon dioxide emissions of 0.34 kgCO2/kWh

Answer 1

GIven 24 Kwh lday eneagd nousehold use= avesage household eneng is due to gas 20% of healing 24kwh/day 4.8 Kwh/day co emissions in natunal gas= o2 kaco kwh 48 kwh day RAAFSS emitled is Co2 Foの 48 kidA O2 day 0.96 K8 C02 day Fon 1o yeansaco emitted by heating natural gas dags 096 K8 C0, x 365 x (O 35040 K8CO COm natunal 7s hea Eing)

Given, 20,000 m/an um ker distance thavellad b ca annum cars fuel etficten cy =ol / m Fuel caa 20000bm used by annum 2000 num G Calonific value of petahol 10 .eneng Paoduced by kt yeh annu 20000 Kwh 11 annum GIven Dengine's eneng phodured efficency 20 = 2000o kwh 20 annum 4000 kwh annum Gi ven o.25 KA CO2 KWh Co, emiteed 17 400okat ko 25 K emitted CO2 annum annum 1000 kg cos 1 annum

5 Foh toyeaas, emitted Co, 10 years annum Kасо 0yeans t0000 emitted . Total of amount natunal gas heating= (0000 35040 45040 K.g o 1 Gven Co2 abso9bed by Plant Kgco (0-5 10 Heans . No of plants neguined 45040 10.S -4289-S2 fhaction be in Thees Caun not 4290 heguai ed - tnees No of