Moisture content of the continuous dryer solid feed is $37\%($dry base$).$ Desired moisture content at the end of the drying process is $2\%($dry base$).$ Air which is at $290K$ and $30\%$ relative humidity is sent heater before entering the dryer. Air leaves the heater at $355K.$ Solid product rate is $0\mathrm{.}135k\frac{g}{s}.$ Air leaves the dryer at $55\%$ relative humidity. Based on the given information Find:

$,$ The flowrate of air to the preheater $(15$ points$)$

Amount of heat added to the air in the preheater $(10$ points$)$

Assume humid heat as $1\mathrm{.}02K\frac{J}{k{g}^{**}(K)}$ and dryer operates adiabatically.