NYE matrixMaterial flow analysis

We continue with our material flow analysis. The following information describes the system, in which some processes and streams have changed from before. The question finally concerns the calculation of one of the currents in the system.

The system consists of the following three processes, with a flowchart given below.

${?}^{**}$ P$1$: manufacture of concrete elements

P$2$; production of housing

P$3$: demolition of housing

In short, we know about the currents in the system that:

Around $25,000$ housing units are bulit each year in Norway. A rough estimate is that each housing unit requires $30m3$ concrete for different parts of the structure together, such as concete or pre$-$formed concrete elements.t means that every year $750,000m3$ of concrele $($from P$1)$ is delvered to housing construction $($P$2),$ in the form of concrete and concrete elements.

In residential construction, it is $6\%$ of the concrete that ends up as a loss andnot in a dwelling, and can say that going out of the system. The remainder will be used for demoition when the buiding is disposed of$.$

${?}^{**}$ An optimistic assessment of the reuse of building elements is that $14\%$ of the concrele mass from demolition theDastinets husig can be used in new buildings and Nye concrete replacements $(31$ in flowchart$).$ The rest is used as a filler orfor others applications for loose materials and exits the system.

All tensioners are counted as m$3$ and we assume a system in balance $($steady state$).$

This information we can use to set up a coefficient matrix for MFA. Here follows a coefficient Matrix one of the rows is missing.

$\backslash$table$[[01,12,20,23,30,31,Y$