$8.-$ A heat exchanger uses saturated water vapor at $14$ barg $($gauge pressure$)$ to heat an ambient air flow $($absolute pressure $=100$kPa $)$ of $85,000m\frac{3}{h}$ from $15C$ to $170C.$ Knowing that the exchanger operates at constant pressure and that the water leaves the equipment as a saturated liquid,

a$)$ Determine the heat flow released by the water and the demanded steam flow measured in ton$/$h $($assume that the variations in kinetic and potential energy are negligible$).$ ton $\frac{?}{h}$

Note: For air enthalpy calculations use $Cp=1kJkg-1K-1.$