List of top Fluid Mechanics and Thermal Sciences Questions on Heat exchanger performance

Saturated vapor at 200°C condenses to saturated liquid at 150 kg/s on the shell side of a heat exchanger (latent heat $h_{fg} = 2400$ kJ/kg). A fluid with $c_p = 4$ kJ·kg$^{-1}$·K$^{-1}$ enters the tube side at 100°C. Effectiveness = 0.9. The required tube-side mass flow rate is __________ kg/s (in integer).
A shell and tube heat exchanger is used as a steam condenser. Coolant water enters the tube at 300 K at a rate of 100 kg/s. The overall heat transfer coefficient is 1500 W/m².K, and total heat transfer area is 400 m². Steam condenses at a saturation temperature of 350 K. Assume that the specific heat of coolant water is 4000 J/kg.K. The temperature of the coolant water coming out of the condenser is \(\underline{\hspace{1cm}}\) K (round off to the nearest integer).