$(9)$

$12\mathrm{.}55$ Moist air at $25C,1$atm, and $40\%$ relative humidity enters

an evaporative cooling unit operating at steady state consisting of a

heating section followed by a soaked pad evaporative cooler operating

adiabatically. The air passing through the heating section is heated

to $43C.$ Next, the air passes through a soaked pad exiting with $40\%$

relative humidity. Using data from the psychrometric chart, determine

a$.$ the humidity ratio of the entering moist air mixture.

b$.$ the rate of heat transfer to the moist air passing through the

heating section, in kJ per kg of mixture.

c$.$ the humidity ratio and temperature, in $C,$ at the exit of the

evaporative cooling section.