Answer Happy

QUESTION 2 (50p): Consider an ideal regenerative reheat rankine cycle the pump and each turbine stage have an isentropic efficiency of 100%. Superheated steam is at 10 MPa, 450°C at the turbine inlet and the pressure is 7.5kPa in the condenser. The reheat pressure is 4Mpa. Steam expands in the low pressure turbine to 0.7MPa. Here some steam is send to an open feedwater heater. The rest of the steam continues to expand in the following stages of the low pressure turbine the the condenser pressure. At the exit of the feedwater heater saturated liquid is at 0.8 MPa. Calculate (a) the heat addition, in kJ per kg of steam entering the first-stage turbine. (b) the thermal efficiency. (c) the heat transfer from the working fluid passing through the condenser to the cooling water per kg of steam entering the first-stage turbine.