Diesel vs Bensín, CO2 útlosun

Hver er hinn eiginlegi munur á dieselolíu og bensínu með tilliti til CO2 útlosunar?

1 Líter af Bensíni:
Orkuinnihald : 9,7 kWh
CO2 útlosun  : 2,325 kg
~ 240g CO2/kwh

1 Líter af Diesel:
Orkuinnihald : 10,7 kwh
CO2 útlosun  : 2,664 kg
~ 248g CO2/kwh

Mér þykir mjög líklegt að kolefnisskatturinn hafi verið reiknaður út frá CO2 útlosuninni hér að ofan, án þess að taka tillit til orkuinnihalds orkugjafanna tveggja.

Ef svo yrði gert myndi skatturinn skiptast svona: Bensín 5.57 kr/L og Diesel 5.76 kr/L 

Bensínhákar óseljanlegir?

Athugasemdir

[Rauða Ljónið, 6.6.2008 kl. 22:38]

Sæll. Stefán varstu með þetta eða eitthvað annað svipað.

Derivation of conversion factors - technical

Coal-fired power stations burning: black coal, about 1.2MWh electricity is produced from 1 tonne of coal; brown coal, about 0.8MWh electricity is produced from 1 tonne of coal;

Calculation of kg of CO2 released from burning a litre of liquid fuel: LPG Specific gravity of LPG is 0.52; Formula of LPG is approximately C4H10; Molecular weight = 58; Atomic weight of 4 carbon atoms = 48; Proportion of carbon in molecule = 48/58 = 0.83;

Petrol (gas in USA) Specific gravity of petrol is 0.74; Formula of petrol is approximately C8H18; Molecular weight = 114; Atomic weight of 8 carbon atoms = 96; Proportion of carbon in molecule = 96/114 = 0.84;

Diesel Specific gravity of diesel is 0.85; Formula of diesel is approximately C16H34; Molecular weight = 226; Atomic weight of 16 carbon atoms = 192; Proportion of carbon in molecule = 192/226 = 0.85;

Conversion of carbon to CO2 Molecular weight of CO2 = 44; ·         Atomic weight of carbon = 12; 44/12 = 3.67; ie. 1kg of carbon combined with oxygen becomes 3.67kg of CO2.

 

 

 

 

 

 

 

 

Note: The constant 3.6667 is for converting kg of carbon to kg of CO2. One kg of carbon combines with 2.6667kg of oxygen to form 3.6667kg of CO2.

 

More on boiling water: The minimum amount of water that a typical cordless electric jug can heat is 480mL. Every time one of these is used to heat a mug of water (about 280mL) for tea or coffee, starting from 25 degrees Celcius, I calculate that 0.018 kWhs is wasted in boiling that extra 200mL. Assuming that this electricity is from a brown coal fired power station 23g of unnecessary CO2 is released to the atmosphere. If this is done twice a day for a year we have 17kg of CO2. Who is carefull to fill a jug exactly to the minimum mark? If the jug is filled 20% above the minimum (576mL rather than 480mL), then the figure becomes 24kg of unnecessary CO2 per year - just from making two mugs of tea each day!

 

Carbon dioxide released per kWh of electricity generated
For fossil fuelled power stations
Approximate values

Natural gas= 0.45kg Oil= 0.5kg Black coal= 0.8kg Brown coal= 1.2kg

 

 

 

NameCarbon SymbolC Atomic Number6 Atomic Weight12.0107

NameOxygen SymbolO Atomic Number8 Atomic Weight15.9994

NameHydrogen SymbolH Atomic Number1 Atomic Weight1.00794

Vantar bensín í töfluna. 

Kv, Sigurjón Vigfússon

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