In the drying rate curve $($shown below$)$ for a tray dryer,

$(1+1+3+5)$

a$)$ Label the constant rate of drying period in the plot

b$)$ Label the falling rate period in the plot

c$)$ What is the critical free moisture content $(x_c)$ and the rate of drying $(R_e)$ in the constant rate period? Indicate both of them in the plot.

d$)$ The dry weight of the solid is $3000g.$ The tray dryer has $2$ trays. The free surface area of $1$ tray is $0\mathrm{.}0504m^2.$ Estimate the time for drying in the constant rate period.

Solution:

$($Assume equilibrium moisture content to be comparatively negligible$)$

$3$