Question

Air is heated by exhaust gases that flow in a heat exchanger, as shown in the...

Air is heated by exhaust gases that flow in a heat exchanger, as shown in the figure. The
heat gained by the air is measured as 320 kW and the inlet air temperature is 20°C.
Exhaust gases inlet state is 527°C, 822 kJ/kg, 64 m/s while the exit state is 327°C, 607
kJ/kg, 78 m/s. If the flow rate of air is 10kg/s, determine the flow rate of exhaust gases
and the exit temperature of air. [Cp-air = 1.005 kJ/kg °C]

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