a$)$ A room contains air at specified conditions and relative humidity. The partial pressure

of air, the specific humidity, and the enthalpy per unit mass of dry air are to be

determined.

b$)$ The masses of dry air and the water vapor contained in a room at specified conditions

and relative humidity are to be determined.

$\frac{R}{O}OM$

$240m^3$

$23C$

$98$kPa

$50\%RH$

c$)$ Humid air at $10C$ and $90\%$ relative humidity enters a duct with a heating coil, the

total pressure inside the duct is $300$kPa. The air is heated by the coil and exits at $50C.$

Calculate:

a$.$ The relative humidity at the exit of the duct

b$.$ The amount of heat per $kg$ of dry air needed by to increase the temperature to

$50C.$