Question

Water is the working fluid in a Rankine cycle with reheat. Superheated vapor enters the turbine at 10 MPa, 520°C, and the condenser pressure is 6 kPa. Steam expands through the first-stage turbine to 0.7 MPa and then is reheated to 520°C. The pump and each turbine stage have an isentropic efficiency of 70%.


Determine for the cycle:

(a) the heat addition, in kJ per kg of steam entering the first-stage turbine.

(b) the percent thermal efficiency.

(c) the magnitude of the heat transfer from the working fluid passing through the condenser to the cooling water, in kJ per kg of steam entering the first-stage turbine.

I checked c to ensure that was indeed the question. It is what was posted.

Answer 1

For this problem, we used steam table for value of specific enthalpy, specific entropy and specific volume by which we calculate the heat addition, heat removed and efficiency of the cycle as below: (all data taken from steam table (R.S.khurmi, S.chand))

answered by: anonymous