question archive Steam at 30 MPa and 620 C, enters a Rankine turbine and expands to a pressure of 100 kPa
Steam at 30 MPa and 620 C, enters a Rankine turbine and expands to a pressure of 100 kPa
Subject:Mechanical EngineeringPrice: Bought3
Steam at 30 MPa and 620 C, enters a Rankine turbine and expands to a pressure of 100 kPa. Determine: (a) The turbine work, in kJ/kg. (b) The heat added at the steam generator, in kJ/ kg (c) The exit quality of steam at the turbine outlet, in percent. (d) The heat rejected at the condenser, in kJ/kg (e) The cycle thermal efficiency. (Ans. x= 82.6%, nith = 39.0 %) Reconsider the Rankine cycle in Problem 7.1. Now, the manufacturer assured that the isentropic efficiency of the turbine and pump is 93%. Calculate: (a) The turbine work in kJ/kg (b) The heat added at the steam generator, in kJ/kg (c) The heat rejected at the condenser, in KJ/kg (d) The cycle thermal efficiency. (Ans. 36.0 %) Recalculate the Rankine cycle in Problem 7.1. Now, it is modified to add one stage of reheat. The stew.n enters the turbine at 30 MPa and 620 C and is extracted and reheated to 3.0 MPa and 500 C. The condenser pressure is 100 kPa. Determine: (a) The turbine work in KJ/kg. (b) The heat added at the steam generator, in kj/kg (c) The exit quality of steam at the condenser inlet, in percent. (d) The heat rejected at the condenser, in KJ/kg (e) The cycle thermal efficiency. (Ans. x= 98.0%, 39.5 %)
