QUESTION $4$

A $C{O}_2$ refrigeration unit works between the temperature limits of $-25C$ and $10C.$Calculate the following:

$4\mathrm{.}1.$ Ideal coefficient of performance.

$(3)$

$4\mathrm{.}2.$ The mass of ice the unit can produce in two hours if it uses water at $16C,$ the relative COP is $0\mathrm{.}70$ L for ice is $330k\frac{J}{k}g$ and the power supplied is $100$ kW $.$