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# (Solved): Question 1 [10] Air is to be preheated by hot exhaust gases by means of a crossflow heat exchanger b ...

Question 1 [10] Air is to be preheated by hot exhaust gases by means of a crossflow heat exchanger before it enters a furnace. Air enters the heat exchanger at 101.3-kPa and 22°C and leaves at 120°C. If the exhaust gases enter the heat exchanger at 160°C at a rate of 0.95-kg/s and leaves at 95°C, determine the rate of heat transfer to the air, and the volume flow rate of the air to maintain the exit temperature. Take Cp for air as 1.005-kJ/kg.K and for the exhaust gases Cp = 1.10-kJ/kg.K. Air 101.3kPa 22°C 0.6 m³/s Exhaust gases 95°C

Question 1 [10] Air is to be preheated by hot exhaust gases by means of a crossflow heat exchanger before it enters a furnace. Air enters the heat exchanger at and and leaves at . If the exhaust gases enter the heat exchanger at at a rate of and leaves at , determine the rate of heat transfer to the air, and the volume flow rate of the air to maintain the exit temperature. Take for air as and for the exhaust gases .

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