Talk:Water efficiency/Archive 1

Archive 1

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I'd like to see the concept of water efficiency given mathematical definition on this page. Given that:

"In physics and engineering, including mechanical and electrical engineering, energy efficiency is a dimensionless number, with a value between 0 and 1 or, when multiplied by 100, is given as a percentage. The energy efficiency of a process is defined as

$\mathrm {efficiency} \ \eta _{E}=\mathrm {{power\ output} \over \mathrm {power\ input} } \ (={\frac {{\text{work}}\ W}{{\text{energy}}\ E}})\,$

where W is the amount of useful work done by the process (in joules), and "energy" E is the quantity of energy (again, in joules) used to run the process.

Energy efficiency within a closed system can never exceed 100%." (from energy efficiency page)

or

$\eta _{E}={\frac {E_{out\ in\ product}}{E_{input}}}=1-{\frac {E_{lost}}{E_{input}}}\qquad {\mbox{(3)}}$

(from exergy efficiency page)

Should water efficiency bsomething like:

$\mathrm {efficiency} \ \eta _{H20}=\mathrm {{H20\ output} \over \mathrm {H20\ input} }$

-- Sholto Maud (talk 07:35 16 May 2007 (UTC)