How much CO2 emitted per KW used?

Register1

Hi there,

I am doing a project at the moment and need to know how much CO2 is emmited based on the usage of 1kWh, anyone know how to work it out.

Thanks,

Reg1

Heroditas

Depends on what the energy source was.
The average for Ireland is 539g CO2/kWh - this is based on the figures supplied by the CER for 2007.

Register1

Its a business with electrical consumption of 300,000 kWh per annum, supplied by ESB

How can I work out Co2 emissions based on that figure,

Thanks,

Reg1

probe

ESB is 625g per kWh. See their fuel mix disclosure:
http://www.esb.ie/esbcustomersupply/residential/your_account/fuel_mix.jsp

probe

Register1 wrote: »

Its a business with electrical consumption of 300,000 kWh per annum, supplied by ESB

How can I work out Co2 emissions based on that figure,

Thanks,

Reg1

300'000 * 625 = 187'500'000 g CO2 = 187,5 tonnes

Note: the SI standard is to use a lower case k in kW (your heading) http://www.bipm.org

quentingargan

To some extent, it also depends on the time of use. During peak hours, they pull in all sorts of brown generation.

Register1

Thanks for replies, appreciate it.

Reg1

Oldtree

The fuel mix disclosure is also on the back of the ESB bill.

derry

The KW kilo rate varies a lot between factors like is it electric production or for example the HP or KW a car engine produces or even the heat from a turf fire

An example of where it goes bonkers is electric production

A seven stage gas generation electric power station with local heating to the community in Holland did succeed to have a peak effiency of 87% in 1990 in the day time at peak load demand

However the same station at night would be wasting a lot of its power so effiency could drop down to 30% as we cant slow down big electric power stations like car engines thye need to run full tilt 24 hours aday

The average of the station might therefor be more like 50%

If that required say 100 grams of natural gas fuel to produce one kilowat of power we could see that from CO2 tables the ratio for natural gas is 2.3 ratio so that means we would produce some 230 grams of CO2 for each 100grams of fuel burnt as compared to say coal which might produce 300 grams of CO2 per kilowatt per 100 grams of coal

However when we factor in the power production at night hich is wasted power we might then have to say that 1 kilowatt off power from the gas electric station makes an average of say 500 grams of CO2 per kilowatt

Then in the same exersize if we have a coal station we find that makes 700 gramms of CO2 per kilowatt as coal from tables often makes more CO2 per kilowatt
With a mix of fuels like natural gas ,deisel, coal turf and bio material like wood chips we might arrive an average of 600 grams per kilowatt for a region or country which produces electric power


Another country like China with mostly coal powered electric power stations might be more like 1 kilowatt makes 1000 grams of CO2

On car engine typicaslly on mid size cars 30kw at 50mph we might find that the engine effiency is
30%.Then when we factor in riction and drag factors from transmission and air drag and brakes and rolling fiction etc we might find the global effiency on the high way at 55mph might be 12%.
However with traffic jams in own traffic that might drop down to less than 5% global effiency
If the car gets some 30MPG in mixxed traffic or some 10 liters to 100 kilometers we can see how many kilograms of fuel is burnt per kilometer.

From the table we might find that 1 kilogram of petrol makes 2.2 kilograms of CO2 and so we can say so many grams of CO2 per kilometer

However without a way to know the kilowatt power of the car engine we are non the wiser what is the HP or kilowatt per kilogram ratio

What we can do is figure out the total kilowatt power the kilogram of the petrol fuel is some 12kw per kilogram if I recall and work out the gross ratio but its sure the solution wil be far worse than electric power station expect it to be te double or more for the cars than a super effiecient electric power station expect figure of 1500 gramms to 2 kilos per kilowatt for cars

Bear in mind that there are hidden power factors at work .It takes approx 3 liters of oil to get 7 liters of fuel to a eletric power station or petrol to the forecourt.This means all the figures for cars and electric power stations have to then be bumped up another 30% roughly

Also a typical 1 ton car of steel will require 4 tons of oil to make the steel and the car
A typical car will go 100,000 miles at say 25MPG will use some 25 tons of fuel in its life.Ball park we can say 30 tons of fuel burnt in total life of a car at say 2.5 kilos ratio will make 75 tons of CO2

So if we look a electric power station that uses 40 tons of fuel per hour and the tables show its fuel ratio is 2.5 we can say it makes 100 tons of CO2 per hour

If we add up all the power stations and all the cars trucks planes ships for Ireand or the world we can see how many tons of CO2 we make each day or each year

From this we can see the measure of the CO2 reading from Hawai which show the rise from 270PPM in 1900 to 380PPM today

We can calculate what amount of that is from humans and what amount is from somewhere else
Ball park humans account for less than 10% of this rise of CO2 levels more like 5% so the bulk of the rising CO2 levels seem to come from nature probably the sun getting hotter in its sun spot phase which makes more trees grow which then makes more CO2 .
Now we can expect a cooling phase to start as sun spots go to minimum which is bad news for us as global cooling often results in bad food production world wide
Unfortunatly setting fire to more oil to try to heat the planet up is waste of time a bit like trying to get a match to heat a large warehouse and the CO2 gas doesnt create global warming so wejust expect things to get cooler


Derry




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djpbarry

derry wrote: »

Ball park humans account for less than 10% of this rise of CO2 levels...

Based on?

derry wrote: »

...probably the sun getting hotter in its sun spot phase which makes more trees grow which then makes more CO2 .

More trees results in more CO[latex]_2[/latex]? How does that work?

derry wrote: »

Unfortunatly setting fire to more oil to try to heat the planet up is waste of time a bit like trying to get a match to heat a large warehouse and the CO2 gas doesnt create global warming so wejust expect things to get cooler

Who's we?

derry

djpbarry wrote: »

Based on?
More trees results in more CO[latex]_2[/latex]? How does that work?
Who's we?

no point to debate with you as you will probaly just ban me like the last thread cuase I dont believe in your religion

Derry

djpbarry

derry wrote: »

no point to debate with you as you will probaly just ban me like the last thread cuase I dont believe in your religion

Yes, I banned you, which is why you're still able to post on this forum :rolleyes:.

If you're not prepared to back up a statement, then don't post it.