Question

H20 at 2 bars and 150C is flowing through a pipe at a mass flow rate of 2 kg/s as it is being heated by an electrical resistance in the pipe. At the exit of the pipe (whose diameter does not change), the temperature of H20 increases to 250C as its pressure stays constant at 2 bars. 1) Determine the size of the heater needed (in terms of the amount of heat transfer needed for steady-state operation), 2) Determine the change in flow speed between the inlet and the outlet.

Answer 1