You are required to set up four linear programming $($LP$)$ models if you are enrolled for Optimisation

$874,$ or only three models if you are enrolled for Optimisation $774.$ Models I to III $($both $774$ and $874)$

must be solved for and Model IV $($only $874)$ only need to be formulated. You will therefore have a

maximum of four optimisation models on paper and three being coded.

$1.$ Model I $($both $774$ and $874)$: you must solve for the single best $($optimal$)$ unit to be used under

water profile Data $1.$ The objective must be to maximise accumulated air cooling over time

$($equivalent to the highest average$).$ Times when sufficient water is available, the unit may

provide air cooling, and for the times when sufficient water is not available, the unit must be

switched off and provide zero air cooling. For each time step, the air$-$cooling rates of the

optimally selected unit must be written to the Excel file under the provided column $($B$)$ in the

$$Results$$ sheet. Make sure to indicate in cell B$2$ of the $$Results$$ sheet what unit $($I$,$ II$,$ III, or

IV$)$ your LP model solved for to be the optimal choice. Cell B$2$ is marked in green.