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 22C and leaves at 120C. If the exhaust gases enter the heat exchanger at 160C at a rate of 0.95-kg/s and leaves at 95C, determine the rate of heat transfer to the air,

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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

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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

2 2^{\circ} C

and leaves at

12 0^{\circ} C

. If the exhaust gases enter the heat exchanger at

16 0^{\circ} C

at a rate of

0.95 kg / s

and leaves at

9 5^{\circ} C

, determine the rate of heat transfer to the air, and the volume flow rate of the air to maintain the exit temperature. Take

C_{p}

for air as

1.005 - kJ / kg . K

and for the exhaust gases

C_{p}

= 1.10 - kJ / kg . K

.

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