Reconsider Prob. 11–122. Using EES (or other) software, investigate the effects of the condensing steam temperature and the tube diameter on the rate of heat transfer and the rate of condensation of steam. Let the steam temperature vary from 20°C to 70°C and the tube diameter from 1.0 cm to 2.0 cm. Plot the rate of heat transfer and the rate of condensation as functions of steam temperature and tube diameter, and discuss the results.

Data from problem 22

Steam is to be condensed on the shell side of a 1-shellpass and 8-tube-passes condenser, with 50 tubes in each pass, at 30°C (h_fg = 2431 kJ/kg). Cooling water (c_p = 4180 J/kg · K) enters the tubes at 15°C at a rate of 1800 kg/h. The tubes are thin-walled, and have a diameter of 1.5 cm and length of 2 m per pass. If the overall heat transfer coefficient is 3000 W/m² · K, determine

(a) The rate of heat transfer

(b) The rate of condensation of steam.

Transcribed Image Text:

Steam 30°C 30°C 15°C ← Water 1800 kg/h