It means that the energy produced from the garbage is 90% superior to the energy consumed to process it. Imagine the machine consumes 100Wh to process the garbage, and produces a total of 190Wh (Don't know if those are the real units for energy... i'm not really into physics, sorry). This value is not directly related to the efficiency. To calculate the efficiency you would have to know the theoretical energy that the garbage could produce if the processing conditions were 'ideal' (which would always be < 100%). So, 90% is a perfectly normal number, as far as i'm concerned.
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Passarinhuu @ Feb 5th 2007 7:42AM
It means that the energy produced from the garbage is 90% superior to the energy consumed to process it. Imagine the machine consumes 100Wh to process the garbage, and produces a total of 190Wh (Don't know if those are the real units for energy... i'm not really into physics, sorry). This value is not directly related to the efficiency.
To calculate the efficiency you would have to know the theoretical energy that the garbage could produce if the processing conditions were 'ideal' (which would always be < 100%).
So, 90% is a perfectly normal number, as far as i'm concerned.
Sorry for the bad english =D