The second steam power plant operates on a regenerative Rankine cycle, where water is used as the working fluid. Steam enters the turbine at 8 MPa and 450 ºC. After isentropic expansion in the first stage of the turbine, steam is extracted at an intermediate pressure of 0.75 MPa and passed to a closed feedwater heater. The feedwater leaves the heater at 8 MPa and a temperature equal to the saturation temperature at 0.75 MPa. The saturated liquid condensate from the feedwater heater leaves at 0.75 MPa and is pumped into the feedwater line. The condenser pressure is 7.5 kPa. The net power output from the cycle is 100 MW Task 4 1. Draw the TS diagram for this system and clearly label all the states 2. Find the rate of heat transfer to the working fluid passing through the steam generator. 3. Determine the thermal efficiency of the cycle. 4. Explain how the turbine work output, heat supplied, heat rejected and moisture content at turbine exit change when regeneration is added to a simple ideal
The second steam power plant operates on a regenerative Rankine cycle, where water is used as the working fluid. Steam enters the turbine at 8 MPa and 450 ºC. After isentropic expansion in the first stage of the turbine, steam is extracted at an intermediate pressure of 0.75 MPa and passed to a closed feedwater heater. The feedwater leaves the heater at 8 MPa and a temperature equal to the saturation temperature at 0.75 MPa. The saturated liquid condensate from the feedwater heater leaves at 0.75 MPa and is pumped into the feedwater line. The condenser pressure is 7.5 kPa. The net power output from the cycle is 100 MW
Task 4
1. Draw the TS diagram for this system and clearly label all the states
2. Find the rate of heat transfer to the working fluid passing through the steam generator.
3. Determine the thermal efficiency of the cycle.
4. Explain how the turbine work output, heat supplied, heat rejected and moisture content at turbine exit change when regeneration is added to a simple ideal Rankine cycle.
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