I just recently calculated my annual energy consumption for the sake of comparing my
electrical consumption (kW·h) and natural gas consumption (m³).
Converting both to GJ I found that, even though the final dollar value was
approximately the same for each energy source, I consumed, electricity was 3 times the
cost per GJ as compared to natural gas.
There is a reason why the electrical companies don't want to convert kW·h to joules
for domestic pricing.
greg
>>> <[EMAIL PROTECTED]> 2001-02-16 21:17:44 >>>
2001 February 16
In USMA 10405 Mechtly listed energy prices from 440 MJ/$ to 11 MJ/$.
For 25 years I have priced energy in $/GJ.
This is used to find the value of solar energy where the heat loss in GJ/y of
a building is calculated or measured and the present value of a solar feature
is to be calculated.
Inverting we have: 440 MJ/$ => $2.27 / GJ 11 MJ/$ => $9.09 / GJ
In Colorado USA gas is billed in therms where a therm is 100 000 Btu
and a Btu is 1055 J and electricity is billed in kWh.
>From my bills: 2000 Oct 2000 Nov 2000 Dec 2001 Jan
elec $20.55/GJ $20.24/GJ $18.93/GJ $18.52/GJ
gas $7.21/GJ $6.23/GJ $6.39/GJ $8.69/GJ
The numbers are the gross cost. That is, all the extra costs (pipe line,
distribution, etc.) in the bill are included.
For gas the higher heating value is billed. My furnace does not condense
the water vapor so I get the lower heating value from my furnace (and
water heater). The lower heating value is some 20% below the higher
heating value so the cost of gas to me is maybe 20% higher.
Gas energy costs half as much as electric energy. It used to cost 4 times
less.
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Hey, do you want a space in $20.24/GJ? I do not use a space.
For 20.24 $/GJ we use a space. Let us know what you think.
Robert H Bushnell [EMAIL PROTECTED]
