Boiling a litre of water

CO2e: 0.05kg (40 mins)

The AECB (http://www.aecb.net/forum/index.php?topic=1064.0) board quotes DEFRA CO2 figures for electricity:

“The correct figure is now 0.527kgCO2/kWh http://www.defra.gov.uk/environment/business/envrp/pdf/conversion-factors.pdf

However the originator of the topic says:
“My research shows that it will be approx 1kg but this is based on some very rough assumptions which aren’t sufficiently reputable and referenceable.”

Heating 1 kg of water by 80 degC is 80(degC) * 4.2(joules/degC/gm) * 1000 (gm) = 336,000 joules. = 0.336 megajoules

1kw/hr = 3600(sec) * 1000 (joules/sec) = 3.6 megajoules

This gives 0.527 * 0.336 / 3.6 kgCO2e = 0.05 kg.

If a litre of water is allowed to boil dry the heat reqiured is 1000(gm) * 2260 (joules/gm) = 2.26 megajoules

Unfreezing a litre of water requires 1000(gm) * 334 (joules/gm)= 0.334 megajoules