Cold water (c_p= 4180 J/kg·K) enters the tubes of a heat exchanger with 2-shell passes and 20-tube passes at 20°C at a rate of 3 kg/s, while hot oil (c_p= 2200 J/kg·K) enters the shell at 130°C at the same mass flow rate and leaves at 60°C. If the overall heat transfer coefficient based on the outer surface of the tube is 220 W/m²·K, determine

(a) The rate of heat transfer

(b) The heat transfer surface area on the outer side of the tube.

Transcribed Image Text:

Hot oll 130°C 3 kg/s Cold water 20°C 3 kg/s (20-tube passes) 60°C