Have you thought about composting orange pulp?
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| Energy Efficiency of sustainable and unstainable fuels http://byap.backyardmagazines.com/forum/viewtopic.php?f=31&t=17173 |
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| Author: | Stuart Chignell [ Jul 2nd, '13, 06:30 ] |
| Post subject: | Energy Efficiency of sustainable and unstainable fuels |
I've been doing a fair bit of reading lately on biogas, biomass and other forms of alternative energy. One of the quoted figures is the energy efficiency of a particular method. ie how much energy out after the amount of energy in has been accounted for. This is all very well to compare different AEs but how do they compare to coal or oil? Does anyone know? Any studies that people can link to? I've tried google and wiki and will return there shortly but I'd appreciate the answer if someone can point me in the right direction. |
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| Author: | Gunagulla [ Jul 2nd, '13, 06:53 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
Coal-fired electricity runs around 30-45% efficiency for modern power stations, internal combustion engines are more like 20%, but rockets can be 70%! That's just the combustion, ignoring all the energy required to mine/extract, process, and transport the fuel. |
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| Author: | Stuart Chignell [ Jul 2nd, '13, 07:51 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
Not looking for the energy efficiency in turns of use. I want the energy efficiency in terms of production. The energy efficiency in terms of use doesn't allow me to compare different ways of getting that energy to use. So brown coal has an energy value of around 28500kJ/kg. How much does it cost in energy to get it to the powerplant? |
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| Author: | Gunagulla [ Jul 2nd, '13, 08:06 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
There is no hard number for that, it all depends on how much overburden they had to remove to get to it at the mine, how much explosives they used, whether it gets to the power station on a conveyor, truck or train, how far it has to be transported etc. I'd call it "lots" |
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| Author: | Stuart Chignell [ Jul 2nd, '13, 08:24 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
Gunagulla wrote: There is no hard number for that, it all depends on how much overburden they had to remove to get to it at the mine, how much explosives they used, whether it gets to the power station on a conveyor, truck or train, how far it has to be transported etc. I'd call it "lots" I understand that there are a lot of variables but there must be some industry standards. In the absence of averag data I would be more than happy with specific data. Best of all would be cost of extraction and delivery of brown coal (in terms of energy) in the Latrobe Valley. |
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| Author: | Gunagulla [ Jul 2nd, '13, 08:32 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
That could be a difficult figure to find... but they'd have to include all the energy for pumping water out of the mines too! I think Hazelwood power station is the least efficient in Oz, and amongst the least efficient in the world, just as far as combustion is concerned, adding the extraction of the coal isn't going to help. I'd suggest contacting Giles Parkinson at RenewEconomy, he may be able to point you in the right direction. |
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| Author: | Charlie [ Jul 2nd, '13, 08:38 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
I wonder how much energy could be harnessed by burning down the Monsanto factory? |
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| Author: | Yavimaya [ Jul 2nd, '13, 13:16 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
enough to make it worth trying, im sure. |
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| Author: | earthbound [ Jul 2nd, '13, 13:25 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
Have you thought about composting orange pulp?
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| Author: | Stuart Chignell [ Jul 2nd, '13, 15:10 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
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| Author: | dr bee [ Jul 2nd, '13, 15:39 ] |
| Post subject: | Re: Energy Efficiency of sustainable and unstainable fuels |
My worms got rid of a batch of pulp, or maybe that was the start of the worm farm going bad? |
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