Because the combustion gases from a boiler leave at a high temperature, they are used to produce saturated steam at $2\mathrm{.}5$ bar using water at $20\backslash$deg C through two exchangers.

as shown in the diagram. The exchangers are considered adiabatic. Take the following average values $$of the heat capacities, in kJ$/$kmol $\backslash$deg C:

$2$o$($l$)=4\mathrm{.}18,2$o$($g$)=33\mathrm{.}6,$ Cpco$2($g$)=37\mathrm{.}0,$ CPN$2($g$)=29\mathrm{.}1$

$1.$ Make the degrees of freedom table and establish a solution strategy. $2.$ Find flow, compositions and unknown temperatures.

CO$,12\%$N$,75\%5$Vapor saturado$2\mathrm{.}5$ barLiq. sat$2\mathrm{.}5$ barCO$200$CAgua a $20\backslash$deg C$120$"CCOH,O $13\%$