A Rankine cycle is executed with steam expanding initially from 20 MPaa and 100 deg SH. Condensation occurs at 399.967 millibars vac. All expansion and compression efficiencies are 90 %. Sketch the equipment layout and the TS diagram. Answer the following for (m = 10 + (SN/5) ) kg/sec of steam circulate and fill up the blanks in the items below: 1. TS diagram with the cycle showing correct location of points with respect to saturation dome line with ne and nc = 90%. 1. Ideal Rankine engine efficiency % Answer: _______________________ 2. Ideal Rankine cycle efficiency % Answer: _______________________ 3. Actual Rankine cycle efficiency using pump and turbine work % Answer: _______________ 7. Actual Rankine cycle efficiency using Qa and Qr values % Answer: _______________ 4. If the generator efficiency = 95%, brake engine efficiency = 90% what is the combined work in KW? Answer: ____________________ 5. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 12 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (IDEAL) Answer: _______________ 6. Torque at the dynamometer in Mega Joules if the engine is running at 900 rpm. Note: SN = 18 Heat rate = 10021.968 kJ/kW h Heat rejected = 25370.6504 kW
A Rankine cycle is executed with steam expanding initially from 20 MPaa and 100 deg SH. Condensation occurs at 399.967 millibars vac. All expansion and compression efficiencies are 90 %. Sketch the equipment layout and the TS diagram.
Answer the following for (m = 10 + (SN/5) ) kg/sec of steam circulate and fill up the blanks in the items below:
1. TS diagram with the cycle showing correct location of points with respect to saturation dome line with ne and nc = 90%.
1. Ideal Rankine engine efficiency % Answer: _______________________
2. Ideal Rankine cycle efficiency % Answer: _______________________
3. Actual Rankine cycle efficiency using pump and turbine work % Answer: _______________ 7. Actual Rankine cycle efficiency using Qa and Qr values % Answer: _______________
4. If the generator efficiency = 95%, brake engine efficiency = 90% what is the combined work in KW? Answer: ____________________
5. If Cp water = 4.187 KJ/kg-K; cooling water enters the condenser at 12 deg C and leaves at 21 deg C, find amount of cooling water needed by the condenser in kg/sec. (IDEAL) Answer: _______________
6. Torque at the dynamometer in Mega Joules if the engine is running at 900 rpm.
Note:
SN = 18
Heat rate = 10021.968 kJ/kW h
Heat rejected = 25370.6504 kW
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