An adiabatic heat exchanger is used to heat cold water at 15°C entering at the rate of 10 kg/sec by hot air at 90°C entering at the rate of 10 kg/sec. if the exit temperature of cold water is 29°C then what will be the temperature of hot air at the exit. Cp for air = 1.008 KJ/Kg. Cp for water = 4.18 KJ/Kg:
1
26.54°C
2
31.88°C
3
58.65°C
4
89.12°C