$6.$ In a steady$-$flow process, a heating and humidifying coil receives an air$-$water vapor mixture at

$14$ psia, $50$ oF$,$ and $30\%$ RH and discharges the air$-$water vapor mixture at $14\mathrm{.}5$ psia, $90$ oF and $75\%$

RH$.$ Calculate the heat transfer per pound of dry air flowing through the unit.

$7.$ With a neat sketch, explain the process of adiabatic mixing. Write down all relevant energy and

mass conservation equations applicable.

$8.$ With a neat sketch, explain the process of adiabatic mixing of water vapor. Write down all

relevant energy and mass conservation equations applicable.

$9.$ In a mixing process of two streams of air, $6,000$ cfm of air at $80$oF and $50\%$ RH mixed with $5000$

cfm of air at $90$oF dry$-$bulb and $75$oF wet$-$bulb temperature. Calculate the following conditions

after mixing at atmospheric pressure:

Dry$-$bulb temperature

Humidity ratio

Relative humidity

Enthalpy

Dew$-$point temperature