Energy is to be produced by passing high pressure steam through an expander. The steam enters the expander at 4000 kPa, 600 C and leaves as vapor at 400 kPa and 200 C. The steam enters at a rate of 550 kg/min through a 15 cm diameter pipe and leaves through a 35 cm pipe. Assuming that the expander is well insulated, at what rate does the expander produce work (in kW)? Keep in mind that shaft work (Ws) is positive when work is done on the control volume, so work produced = (- Ws)