Problem #$9$

Air at $40C$ and a dew point of $10C$ is used to dry $1,000k\frac{g}{h}r$ of a solid initially with water content of $50\%$ and $25C.$ The solids leave the dryer with $5\%$ water at $30C.$ The air exits the dryer saturated at $30C.Cp($solid$)=1\mathrm{.}6k\frac{J}{k}g-KCp($water$)=4\mathrm{.}17k\frac{J}{k}g-K.$ Use the humidity chart to determine the following:

a$)$ The relative humidity of the air entering the dryer

b$)$ The absolute humidity of the air entering the dryer

c$)$ The absolute humidity of the air exiting the dryer

d$)$ The molar fraction of water in the air entering the dryer

e$)$ The mass flow$-$rate of dry air $k\frac{g}{h}r.$

f$)$ The volumetric flow rate of air entering the system $m\frac{3}{h}r$

g$)$ The heat transferred to or from the dryer.

Answer parts e$,$f$,$ and g step by step