Find the exit temperature of air if water enters at 15°C and flows at a rate of 7500 kg/hr.

Question

8,000 kg/hr of air at 105^oC is cooled by passing it through a counter flow exchanger. Find the exit temperature of air if water enters at 15°C and flows at a rate of 7500 kg/hr. U = 145 W/m²K,
A = 20 m². Solve the problem by the NTU method.