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tzechuk
Joined: 20 Dec 2004
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 Posted: Thu Jan 10, 2008 4:26 am Post subject: |
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| BS.Dos. wrote: |
Continuing with the same theme:
Now that we've established the total amount of raw material needed to produce 100,000 tons of ethanol, I now need to calculate some of the process outputs.
Inputs
1000kg (cassava)
4293kg (water)
5293 = 366kg ethanol
The total inputs are:
273,224 tons (Raw cassava)
1,172,950 tons (water)
100,000 tons ethanol
As every 1000kg of raw cassava requires 4293kg of water:
273,224*4.293 = 1,172,950 (I think this is right)
Total input
1,446,174 tons |
Or you could simple use exactly the same method:
(5293/366)*100,000
= 1,446,174.86 tons (roughly)
I don't see why you need to separate the two, if in the end you are trying to figure out the total input of both substances? |
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BS.Dos.
Joined: 29 Mar 2007
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| Posted: Thu Jan 10, 2008 6:01 am Post subject: |
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Sorry, I should have mentioned.
I'm writing an assignment for my MSc. I'm studying Environmental Decision Making. One of the questions I'm answering relates to a case study looking at cassava-based fuel ethanol conversion in China. We have been asked to review and calculate the:
Energy used
Material Mass
Environmental Impacts
required for each of the six processes within the LCA (life cycle assessment). I've pretty much finished it, but decided to include a Sankey Diagram showing the mass movements through the process, which in this instance, are concentrated within 2 of the six processes - the cultivation of the cassava and the cassava/ethanol conversion stage - which is what the info I've given relates to.
We need to separate the two as they obviously represent two different flows within the process, water being an increasingly precious commodity, especially given how much is pumped straight back out of the process as used effluent. The results will obviously be the same, but for the purposes of the Sankey diagram, it's better to calculate them separately. Although, given how poor my maths is, I probably needn't have bothered.
If you enjoy maths, then stayed tuned as I have to start the 3rd part of the first question ASAP. It relates to calculating gas/electric boiler energy efficiency and despite having read the associated theory material, it still scares the pants off me, especially so given how poor my maths is.
Anyway, thanks for your help. Appreciate it. |
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Atavistic
Joined: 22 May 2006
Location: How totally stupid that Korean doesn't show in this area.
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| Posted: Thu Jan 10, 2008 6:23 am Post subject: |
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| Damn. Why'd you have to explain? I was getting all geared up for a party... |
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