A concentric counterflow heat exchanger is used to cool oil by water. The oil flow rate is 0.1 kg/s and enters at 100 C. Water enters at 30 C and a flow rate of0.2 kg/s. The heat transfer area is...

A concentric counterflow heat exchanger is used to cool oil by water. The oil flow rate is 0.1 kg/s and enters at 100 C. Water enters at 30 C and a flow rate of0.2 kg/s. The heat transfer area is 5.223 m²
and the overall heat transfer coefficient is 37.8 W/m²
·K. Find the rate of heat transfer and exit temperatures. Data:
c_p,h

= 2131 J/kg·K and
c_p,c

= 4178 J/kg·K.