INSTRUCTIONS

Consider an electric heating system with a $12-kW$ electrical heater used to heat air flowing through a duct. Air enters the duct at $100$ kPa and $15C$ with a volume flow rate of $120m\frac{3}{m}in.$ Determine the exit temperature of air under two conditions:

Non$-$adiabatic condition: The duct loses $250$ W of heat to the surroundings:

Adiabatic condition: There is no heat loss from the duct to the surroundings.

Compare your results $1$ y $2$ and explain differences.

Assumptions:

The process is steady$-$flow.

The air behaves as an ideal gas.

The kinetic and potential energy changes are negligible.

$4.$ Constant specific heats at room temperature can be used.

$5.$ For non$-$adiabatic conditions, the system loses heat to the surroundings.