Q$2$: $(15$ Marks$)$

Ambient air at $10C$ DB temperature and $20\%$ relative humidity enter a steam humidifier with a dry air mass flow rate of $0\mathrm{.}85k\frac{g}{s}.$ Superheated steam at $110C$ is sprayed into the air stream. The air leaves with a relative humidity of $70\%.$ The pressure is constant at $101\mathrm{.}325$ kPa $.$ Calculate $($i$)$ the DB temperature of the air leaving, and $($ii$)$ the rate of flow of steam.

Q$3$: $(10$ Marks$)$