A shell and tube heat exchanger is being used as a steam condenser. Cold water flows in the tubes at a rate of 0.8 kg/s. The water enters the heat exchanger at 15°C and leaves at 63°C. The steam enters the shell side of the heat exchanger as a saturated vapor at 200 kPa and fully condenses to a saturated liquid. The pressure drop on the shell side is negligible. Determine the following:

a. Mass flow rate of the condensing steam (kg/s)

b. Heat transfer rate between the water and the condensing steam (kW)

c. UA product of the heat exchanger (kW/K)
Consider a situation where the cold-water inlet temperature to the heat exchanger is adjusted to 20°C while its flow rate (0.8 kg/s) remains constant and the steam fully condenses at 120 kPa. For this scenario, estimate the following: