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How much gas do you use?


Wrinkley

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16 minutes ago, Alan de Enfield said:

but I was under the impression that Propane had twice the MJ/Kg than Coal.

 

Nope. I checked. 

 

Confusion is introduced when looking at propane energy density as the SG of propane is about 0.5.

 

Edit to add: 

I checked again and I'm wrong, according to this:

https://hypertextbook.com/facts/2002/EricLeung.shtml

 

Propane is 25.3 MJ/litre. 1960 Litres/tonne.

 

So 1.96 litres per kg of propane. Equals 49.588 MJ per kilogram.

 

Both solid fuel and propane are sold by weight so 13kg (refill size) of propane is 645 MJ of energy. A 25kg bag of coal is about the same, at 625 by my previous calculation.

 

 

Edited by Mike the Boilerman
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2 minutes ago, Mike the Boilerman said:

 

Nope. I checked. 

 

Confusion is introduced when looking at propane energy density as the SG of propane is about 0.5.

 

 

Which would account for 50%.

 

However, the figures you quoted are for MJ/Kg so when comparing 1kg of coal and 1kg of gas the gas has 2x the MJ/Kg

 

I think the figures you have quoted are actually based on MJ/L (which would explain the 50% figure)

 

I have found this table on Wikipedia - maybe that clarifies it ?

 

https://en.wikipedia.org/wiki/Energy_density

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