convert GJ into sq.M?

S Ebels

1 GJ = 947,817.1 btu's. Thats a direct energy to energy translation.

Around here (Michigan) there are supposedly 1,020 btu's per cubic foot. Therefore you would take the 947,817 and divide it by 1020 to arrive at the number of cubic feet per GJ.

1 cubic meter = 35.314 cubic feet

Here's another way 1 GJ = 9.478 therms

Unknown

how does one

convert gigajoules into cu.metres? (or cu.ft, i don't care) is it even possible?

i called my gas supplier and asked this because my bill is in GJ, and they said it doesn't convert because the energy in gas can vary. how are you supposed to track your usage like that? sheesh!

Ron Schroeder

This will convert to Therms

http://www.isaedmonton.ca/AlbertaDirectory/Technical/ConvertG.htm#GL821

http://www.isaedmonton.ca/AlbertaDirectory/Technical/ConvertC.htm

Unknown

ok, now...

how do i go from Therms to cu.M? i did find this: conversions i think i'm on the right track but all these maths give me the brain pain.

you'd think this would be easy....

Unknown

got it

all right! thanks guys. i pay about 49 cents per cu.M then. that sounds about right.

Ron Schroeder

There is always a way to figure things

out but amazing that that those that should know either don't or don't wanty you to know.

Unknown

heh

yeah, i kinda got that feeling.

jp_2

simple as pie

what? they are telling you the amount of energy in joules, can't be any simpler or more accurate than that! well they could have stated in btu's but I assume this is from canada....

joules are equivalent to btu's, they have all the same root units.

Unknown

yeah, but i wanted to know volume. like for energy use calculators found in some heatloss programs and here

jp_2

thats odd,

I don't see how your bill could be calcualted without knowing a volume? they need to start with a simple measurement.

an energy 'meter' would be too complicated.

scrook_2

GJ vs Therms vs cu. m vs hundred cu. ft.

A BTU is 0.9434 GJ so 1 GJ = 943,000 BTU, and since Natural Gas (you're not talking propane, #2 oil, or other, right?) is about 100,000 BTU/hundred cu ft -- 99,000 to 104,000 , so 1 GJ is about 9.43 ccf (hundred cu. ft.) and since 1 cu. meter is 35.32 cu ft (or 1 cu. ft is 0.0283 cu m) then 943 cu ft (9.43 ccf) is about 26.69 cu meters

So 1GJ is approx 26.69 cu m (call it 27 cu m in round numbers).

The actual energy in a given volume of natural gas varies w/ the amount of ethane, propane, nitrogen, etc. in it in addition to the primary component: nmethane. The gas company tracks this and applies the correct multiplier to the number of cu m (or hundred cu ft) that are metered each billing period and bills you in Therms (100,000 BTU) or MJ's. It is a bit confusing, but you can keep track of your energy useage in GJ (or Therms) just as easily as in any other units and (actually) with better accuract than tracking volumes (cu m or ccf). Hope this helps.