Steam is used in the following adiabatic turbine system to generate electricity; 15% of the flow from the first turbine is diverted for other use.

(a) How much work (in kJ/h) is generated by the first turbine which is 80% efficient?

(b) How much work (in kJ/h) is generated by the second turbine which is 80% efficient?

(c) Steam for the turbines is generated by a boiler. How much heat must be supplied to the boiler (not shown) which has 300 kg/h of flow? The stream entering the boiler is T = 170°C, P = 8 MPa. The stream exiting the boiler matches the inlet to the first turbine.

Transcribed Image Text:

P = 8 MPa T = 550C 300 kg/hr P = 5 MPa 15% withdrawn for other use P = 0.8 MPa