Boil 1 L of water: Google and CO2

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fthanron
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Boil 1 L of water: Google and CO2




by fthanron » 22/01/09, 16:47

Hello,

For further reading of this document http://www.stovetec.net/mambo/images/In ... Uganda.pdf , and in particular p4 Carbon Monoxide to Cook grams / Liter 1.4, and in parallel this information concerning the quantity of CO2 emitted to boil the water necessary for a cup of tea http://www.vincentabry.com/chaque-reche ... e-co2-3273 15g, I would like to know what our eminent specialists think of this information?

Do you know of any comparative documents of the different cooking methods / CO2 equivalent impact a little serious?

PS: well done the comparison of Christophe bulbs!

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by Christophe » 22/01/09, 17:19

1) First of all, I don't understand your 1st sentence? What does carbon monoxide do?

2) I think there is a confusion in the figures: between grams of water and grams of CO2 because I have never seen a kettle make 15 g !!

https://www.econologie.com/forums/cout-energ ... t6884.html
http://www.lemonde.fr/technologies/arti ... 51865.html

Your link says:
Or: two Google searches consume as much energy as boiling water in a kettle for a cup of tea! (15 g of CO2)


Le Monde says:
According to the work of this scientist, two queries on Google would generate 14 grams of carbon emissions, almost the footprint of an electric kettle (15 g).


So it's 15 g of water (a very, very small cup) or 14 or 15 g of CO2?

3) Let's check it !!

That's a good fthanron question! Precisely a CO2 / Energy / bill equivalence could be the subject of a future calculator such as that of light bulbs :) I'm thinking about it! Image

(Come on, I put the link back for newcomers: https://www.econologie.com/calculateur-ampoules.html )

So you want to know how much energy and CO2 it takes to boil a kettle (electric therefore, others are quite "rare")? Let's go!

a) We start with water at 10 °, so it must be heated by 90 ° (large broth, the result will be increased)

b) Let's take a 0.8L kettle, this is the "standard" here, ie 0.8 kg of water.

c) We therefore need an energy of: 0.8 * 4,18 * 90 = 300 kJ or 300/3600 = 0.08 kWh

For the equivalent in grams it will obviously depend on the country, let's take the figures from the bulb calculator: https://www.econologie.com/calculateur-ampoules.html

a) France: 0.08 * 90 = 7 gr CO2
b) Germany: 0.08 * 600 = 48 gr CO2
c) Denmark (think super clean wind turbines): 0.08 * 840 = 67 gr CO2
etc., etc...
The USA is located I think between Germany and Denmark. The world average, I think, is a little higher than that of Europe (460 gr / kWh), I would say between 500 and 550 gr / kWh.

So it sticks "not too" with the kettle there ... does it stick better with the cup? To suggest that a cup is 25 cl = 250 g would therefore have:

a) 250/800 * 7 = 1.1 gr CO2 per cup
b) 250/800 * 48 = 15 gr CO2 per cup
c) 250/800 * 67 = 21 gr CO2 per cup

We find the famous 15 gr (I promise I did not cheat !!), we can deduce that the average CO2 / kWh used is that of Germany is 600 gr / kWh (a little more than what I therefore thought ...)

Anyway: CO2 is starting to smoke me bad! There is not ONLY CO2 in life ... read our comments on this subject carefully, yelling on Google is easy, was it better BEFORE? https://www.econologie.com/forums/cout-energ ... t6884.html

ps: I realize that I did not answer the initial question of 1L, you would have to make a cross product ...
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fthanron
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by fthanron » 22/01/09, 18:07

Ahah thank you Christophe super fast and clear demo.

For your question
1) First of all, I don't understand your 1st sentence? What does carbon monoxide do?
, my eyes told me CO2 ... mea culpa, I thought I had two identical elements of comparison.

On the other hand, I had nothing against Goo ..., it's just that my keyword search "boil water CO2" or something like that, led me directly to this article about Goo ...

In fact, concerning CO2, I was actually looking more for the compared energy costs of boiling with wood - gas - electricity (for France at first and more if affinity of course) or environmental impact study / social / and everything (I swim with all these qualifiers bloups bloups) 8)

You know what I mean ? A simple trick, a base that gives an idea for 1 L of water ... 1 L of water is beautiful and very useful : Mrgreen:

@+

PS: at first, I think I understand that a boiling carried out via solar energy will normally be much less "impactful" than a boiling carried out with any other type of energy, however in our region it is not very practical and even less "fast ...", do I have any?
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by Christophe » 22/01/09, 18:11

fthanron wrote:You know what I mean ? A simple trick, a base that gives an idea for 1 L of water ... 1 L of water is beautiful and very useful : Mrgreen:


I can see completely but here I am lazy to do a calculation by fuel ... that will be the subject of a next calculator! Promised!!

You can already have fun with "classic" fuels: https://www.econologie.com/emissions-de- ... -3723.html
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by fthanron » 22/01/09, 20:02

Ok thank you Christophe,

First, here's what I found:

Coal 7.23 KWh / Kg or 0.011 Kg to provide 0.08 KWh
Natural gas 13.90 KWh / Kg or 0.0057 Kg to supply 0.08 KWh
Butane 13.7 KWh / Kg or 0.013 Kg to provide 0.08 KWh
Log wood 3.34 KWh / Kg or 0.024 Kg to provide 0.08 KWh
Wood pellets 4.5 KWh / Kg or 0.018 Kg to provide 0.08 KWh

Strange how these quantities seem to me so insignificant!

What do you / you think?

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by Christophe » 22/01/09, 21:02

Image

You forgot to convert into CO2 and take into account the machine efficiency !!!

In short, your kWh are Primary Energy kWh ... and your kg are kg of fuel and not of CO2 ...

For machine output takes around 2.8.
And for CO2, it depends on the fuel.

But you already have a basis of calculation: PCI ...
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