An oil fraction flowing at the rate of 20.15 kg/s at a temperature of 121 C is to be cooled in a simple counterflow heat exchanger using 5.04 kg/s of water initially at 10°C. The exchanger contains...

An oil fraction flowing at the rate of 20.15 kg/s at a temperature of 121C is to be cooled in a simple counterflow heat exchanger using 5.04 kg/s of water initially at 10°C. The exchanger contains 200 tubes, each 4.87 m long and 19.7 mm outer diameter. If the specific heat of oil is 2.094 kJ/kg K, calculate the exit temperature of the oil. Take U₀
= 0.34 kW/m²
K.