Net energy ratio

Mass efficiency3 System energy efficiency6 System energy use (MJprim/kg FEout) Net energy ratio" c System fossil fuel energy use (MJprim/kg FEout) 6... 

Original source of energy data External fuels used Energy consumed (Ex) Energy as ethanol (Ep) Net energy ratio (Ep - Ex)/Ex... 

Table 31. Net Energy Production Ratios for Ethanol Production from Com in Integrated System ...

That is, the net energy or work put into the fluid by the pump goes to increasing the fluid pressure or the equivalent pump head, Hp. However, because pumps are not 100% efficient, some of the energy delivered front the motor to the pump is dissipated or lost due to friction. It is very difficult to separately characterize this friction loss, so it is accounted for by the pump efficiency, rje, which is the ratio of the useful work (or hydraulic work) done by the pump on the fluid (—w) to the work put into the pump by the motor (—wm) ... 

TABLE 14.6 Comparison of Overall Thermal Efficiencies and Net Energy Production Ratios of Integrated Systems Supplying Substitute Natural Gas from Coal and Natural Gas to Local Distribution Company... 

For most analyses of IBPCSs, the net energy production ratios defined by Eq. (2) are preferable. The ratio (Ep - Ex)/Ex indicates how much more or less salable energy products are produced than the energy consumed by the integrated system if the external, nonbiomass energy consumed is replaced, and it is assumed that the biomass feedstock energy content is zero. This is a... 

Klass, D. L., and Chambers, W. C. (1976). A Comparison of the Net Energy Production Ratios of Integrated Systems Supplying Natural Gas, and SNG from Coal. Paper presented at the 171st National Meeting, American Chemical Society, Division of Fuel Chemistry, New York, April 5-9. American Chemical Society, Washington, D.C. 

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