Oil is being cooled from 180°F to 120°F in a 1-shell and 2-tube heat exchanger with an overall heat transfer coefficient of 40 Btu/h ft² · °F. Water (c_pc = 1.0 Btu/lbm · °F) enters at 80°F and exits at 100°F with a mass flow rate of 20,000 lbm/h, determine

(a) The log mean temperature difference

(b) The surface area of the heat exchanger.

Transcribed Image Text:

Th. out h, Oil flow Thin Tc,out Water flow c,in