We will now calculate life cycle emissions from a process network that includes four processes with internal exchange of products. A flowchart is shown below. The four processes produce respectively, with specified unit:

• tonn stl (P1, stlverk)
• kWh strm (P2, vindkraftverk)
• m3 betong (P3, betongproduksjon), og
• tonn-km transport (P4, jernbanetransport)

tonnes of steel (P1, steelworks) kWh electricity (P2, wind turbine) m3 of concrete (P3, concrete production), and tonne-km transport (P4, rail transport)

You have been given the following technology matrix (technology matrix, A) and intervention matrix (intervention, matrix, B) for the system

Technology Matrix:

translate:

stl,tonn = steel, ton

strm = current

betong = concrete

transport = transportation

Intervention matrix:

translate:

intervensjon = intervention

Calculate the lifetime emissions of CO2 in this system from a total final consumption of 15 tonnes of steel and 2 m3 of concrete. Enter the answer as an integer in units of kg CO2:

\begin{tabular}{|l|c|c|c|c|} \hline Input og outputs & P1 (stl) & P2 ( strm) & P3 (betong) & P4 (jernb.tr.) \\ \hline Stl, tonn & 1 & -0.0001 & 0 & -0.0001 \\ \hline Strm, kWh & -300 & 1 & -1000 & -1.0 \\ \hline Betong, m3 & 0 & -0.0002 & 1 & -0.0001 \\ \hline Transport, tkm & -250 & 0 & -100 & 1 \\ \hline \end{tabular} \begin{tabular}{|l|c|c|c|c|} \hline Intervensjon & P1 (stl) & P2( strm) & P3 (betong) & P4(jb-transport) \\ \hline CO2,kg & 1200 & 0.1 & 600 & 36 \\ \hline SO2,g & 2.5 & 0.001 & 0.7 & 25 \\ \hline Malm, m3 & -3.0 & 0.0 & -1.5 & 0.0 \\ \hline \end{tabular}