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Old 10-14-08, 04:19 PM   #1
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Default A reason to save CO2

Hi,

As several people know, I'm lucky enough to eco-drive and change things at home to generate less CO2, saving money is just the good side. I know since a long time that 1 liter of diesel generates 2.66kg of CO2 (for gasoline it's 24.4) and 1 kWh of electricity produces (in France) 60g of CO2 (to be added to 10mg of radioactive wastes...).

But what I discovered this week-end is how much CO2 are absorbed by one tree : 10 kg/year and this is for younger forests, in older forests trees are growing less and so are needing less CO2 : 7kg/year

With our cars, my wife and I are driving 15000 kms each at 5l/100. We are burning 1500 liters of diesel by years and so we are generating 4 tons of CO2 by year. To absorb such a quantity of CO2 we need 400 trees, ie 0.5 hectare

Of course we do not own so many trees... only half a dozen

For the electricity we are consuming 12000 kWh/year, so it's 720 kg of CO2 which corresponds to 72 trees which is roughly 0.1 hectare.

I grew up in the Foret des Landes, one of the biggest forest in Europe : 1 million hectare. We are 60 millions in France and there isn't 30 millions hectare of forest in France.

Suddenly any thing I'm doing wasting CO2 is making me a little bit more guilty

Denis.

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Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr
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  • kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
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    (2.66 kg/l diesel)
  • kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
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    (59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels :
  • Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
  • Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...
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Old 02-07-09, 04:10 AM   #2
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From Kyoto protocol, the CO2 emissions must be divided by 4 in 2020 compared to 1990. The houses were consuming 43% of total energy with 400 kWh/mē/year, grey energy included. In 2020 houses should consume 100 kWh/mē/year, included 50 for heating, hot water and AC.

(Edit) The accounted energy is the primary one, not the consumed one. For electricity, the French coefficient is 2.58 For other energies it's 1

Here are the data for my house :
  • Surface : 125 mē
  • Total last year electricity bill : 11265 kWh, ie 90 kWh/mē/year.
    (Edit) The corresponding primary energy is 232 kWh/mē/year.
  • evaluation for heating is 3 MWh/year and for hot water is 1.5 MWh/year, no AC, ie 36 kWh/mē/year.
    (Edit) The corresponding primary energy is 93 kWh/mē/year.
  • Butane for cooking : one 13kg bottle/year. In a CO2 point of view this corresponds to 50.31 kg CO2 (3.87 kg CO2 / kg of butane) and to 555 kWh (1 French kWh = 0.09 kg CO2 for basic use that isn't constant) ie 5 kWh/mē/year.
  • No idea about the grey energy used to build my house. From the figures found, it's less than 20% of the total energy consumed yearly by a house, ie (90+5)*0.20 = 19 kWh/mē/year.
  • Now removing the green energy generated by the house : the solar panels should generate around 3125 kWh/year, ie 25 kWh/mē/year.

The final ratio for my house is 90+5+19-25 = 89 kWh/mē/year included 36 kWh/mē/year for heating. These are -11% and -28% of ratio required for the 2020 Kyoto goal
(Edit) The final ratio for primary energy is 232+5+19-25 = 231 kWh/mē/year included 93 kWh/mē/year for heating. These are +131% and +86% of ratio required for the 2020 Kyoto goal

Denis.
__________________
Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
  • kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (2.66 kg/l diesel)
  • kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels :
  • Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
  • Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...

Last edited by groar; 02-27-09 at 05:31 PM.. Reason: Updated the kWh used : clarified the confusion between consumed vs primary energies
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Old 02-07-09, 08:29 AM   #3
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Alright, that was a bit hard to follow, but I think I got a good handle on it. What do you plan to do next to reduce your energy consumption?
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Old 02-14-09, 05:51 PM   #4
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Quote:
Originally Posted by Daox View Post
Alright, that was a bit hard to follow, but I think I got a good handle on it.
I rephrased it...

Quote:
What do you plan to do next to reduce your energy consumption?
Reply in this thread : groar's co2 emission thread

Denis.

__________________
Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
  • kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (2.66 kg/l diesel)
  • kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
    To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
    (59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels :
  • Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
  • Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...
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