Water flowing at a rate of 07 kgs enters a 14 heat exchanger

Water flowing at a rate of 0.7 kg/s enters a 1-4 heat exchanger at 310 K and is heated by an oil stream entering at 380 K at a rate of 3.1 kg/s (c_p=1.85 kJ/kgK). The overall U = 265 W/m^2K and the area is 40 m^2. Calculate the heat-transfer rate and the exit water temperature. Prove the accuracy of any assumptions which you may have made.

Solution

solution

Q = UA (T₁ -T₂)

= 265 X 40 X ( 380 - 310 )

Q = 742000 W