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The biggest problem is that in order to know what the effiency of the catalyst is , we need to know how much energy was needed to create that catalyst.
The (ou) "math" normally forgets to add these needed numbers in.
Instead of trying for (ou) , the better route would be higher eff. , which is why electric heating looks so good. Heat from electric is about as high eff as you can get by doing normal math, BUT how did you get the start of that elec. heat? did it come from burning wood, gas, coal ? etc. The debate can go on and on.
When people get into the "math" and start talking (ou) I only half listen, unless they have all the math numbers to support it. Haven't had any luck yet.
Cheers
Bruce S