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1000 lb Product A

67 lb Solid Waste

1000 lb Product A

67 lb Solid Waste

Energy 1 x 109 Btu

Water 200 gal

533 lb Raw or Intermediate " Material

Energy 1 x 109 Btu

Water 200 gal

533 lb Raw or Intermediate " Material

Coproduct B

10 lb Atmospheric Emissions

33 lb Solid Waste

3 lb Waterborne Waste

FIG. 3.4.5 Example coproduct allocation based on relative weight. (Reprinted from Keoleian, Menerey, and Curran, 1993.)

Coproduct B

10 lb Atmospheric Emissions

33 lb Solid Waste

3 lb Waterborne Waste

FIG. 3.4.5 Example coproduct allocation based on relative weight. (Reprinted from Keoleian, Menerey, and Curran, 1993.)

tem accounting data that result from the model computations give the total results for energy and resource use and environmental releases from the overall system.

The overall system flow diagram, derived in the previous step, is important in constructing the computational model because it numerically defines the relationships of the individual subsystems to each other in the production of the final product. These numerical relationships become the source of proportionality factors, which are quantitative relationships that reflect the relative subsystem contributions to the total system. The computational model can also be used to perform sensitivity analysis calculations.

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