0.72 kg/s of superheated steam enters a crossflow heat exchanger at 240°C and leaves at 120°C. It heats 0.6 kg/s of water entering at 17°C. U = 612 W/ m 2 .K. By what percentage will the area differ...

0.72 kg/s of superheated steam enters a crossflow heat exchanger at 240°C and leaves at 120°C. It heats 0.6 kg/s of water entering at 17°C. U = 612 W/ m².K. By what percentage will the area differ if a bothfluids-unmixed exchanger is used instead of a onefluid-unmixed exchanger ?