Coprocucts

Allocation

Calculations

Parameters

• $Out_{value}=Out_{a}*Out_{cost}\,$ = Value associated with the main output amount, after the losses. $Out_{cost}$ = {energy value, market value, mass, volume}
• $Copr_{value}=Copr_{a}*Copr_{cost}\,$ = Value associated with the co-product output amount. $Copr{cost}$ = {energy value, market value, mass, volume}
• $ee\,$ = Energy and Emissions associated to that co product ( in Joules and Grams per unit of Output for the current process )
• $inputs\,$ = Energy and Emissions for all the inputs of the current process ( in Joules and Grams per unit of Output for the current process )

Calculations

For each allocation method it will be the same idea :

• We convert the amount given for the co product into a quantity of energy, mass, market value or volume depending on the allocation method chosen.
• We grab the amount after losses of the main output
• We calculate the allocation ratio which will be :

$r=1-{\frac {Out_{value}}{Out_{value}+Copr_{value}}}\,$

• We calculate the energy and emissions associated to that co product :

$ee=r\cdot inputs\,$

Note : $Out_{value}\,$ and $Copr_{value}\,$ are in the same unit, they can be both in Joules, Grams, Cubic Meter or Dollar depending of the allocation method chosen.

Displacement

Calculations

Parameters

• $MixEE_{mpm}\,$ = conventional material mix energy and emissions, which are the necessary energy and emissions associated to the production of that material for the specified purpose for this specific mix.
• $S_{mpm}\,$ = the share of the conventional material purpose mix displaced.
• $ee\,$ = Energy and Emissions associated to that co product ( in Joules and Grams per unit of Output for the current process )

Calculations

• For each conventional material mix defined in the displacement ratios we grab the mix energy and emissions. We also grab at the same time the conventional material share.
• We add to the co product energy and emissions the amount displaced, by each conventional material displaced :

$ee=ee+MixEE_{mpm}\cdot S_{mpm}\,$

XML Example

This example is extracted from the process Dry Mill Ethanol Production (US Industry Average). It shows a coproduct which is calculated as a displacement. But if the user wants to change the method and calculate it with the allocation method, the different options which will be shown to the user are also defined.

<coproduct ref="116" method="displacement" amount="[dgs_params!A3];0;True;pounds">
  <allocation value="energy" >
    <option>energy</option>
    <option>market</option>
    <option>mass</option>
  </allocation>
  <conventional_products >
    <product ref="75" purpose="stationary" mix="0" ratio="[composite_displacement_ratios!B3];0;True;percentage"/>
    <product ref="117" purpose="stationary" mix="0" ratio="[composite_displacement_ratios!C3];0;True;percentage"/>
    <product ref="91" purpose="stationary" mix="0" ratio="[composite_displacement_ratios!D3];0;True;percentage"/>
  </conventional_products>
</coproduct>

Common Calculations

Parameters

• $S_{copr}\,$ = share of the coproduct
• $ee\,$ = Energy and Emissions associated to that co product ( in Joules and Grams per unit of Output for the current process )

Calculations

At the end of the calculation process for one of this co products we are doing a last operation which is multiplying the $ee\,$ by a share. This share can be used to define many co products and assign them shares. So the last operation will be : $ee=ee*S_{copr}\,$

Internal Links

• Coproducts Editor