Here are some findings, See attached spreadsheet for graphs and results,
The first graph is, the amount of water we had in the fermentation process (water is the variable in our experiments), against total ethanol produced in grams.
To get the total ethanol produced, we first worked out the density of the liquid produced after distill, we put this on a density vs % ethanol curve, to see what percentage of ethanol was produced, This was then multiplied by the mass of the liquid produced, ending up in grams how much ethanol we actually made. It seems that the optimum amount of water is between 200ml-300ml of water in the fermentation process. We are currently working on an explanation for this, we post soon,
The second graph, shows the amount of water in the fermentation process, against the heat produced per gram of ethanol. We used a % ethanol against heat produced graph, which gave us the heat produced then this was divided by the mass of the total ethanol produced to give heat produced per gram of ethanol. Don't really know whats happening in this graph??, the first free points line up, but from 300ml onwards its a bit bizarre, do you know whats happening?
In terms of using this process to create ethanol as an alternative energy supply. we are about to conduct another experiment to find out the wattage of the gas tap and to see if this process if worthwhile for the amount of heat we get out of it, or are we using to much heat to get a little amount out of making it completely pointless.
The 3rd picture shows all the information we have so far. Any suggestions on what extra things we should look out/find with this information (graphing, calculating or conducting another experiment. Or any suggestions on what we should do next?