Experiment 6: Rankine Cycle Yvette Triay Reporter Group 3

Outline Introduction about Rankine Cycle Experimental Procedure T-s Diagrams Calculations Conclusions

What is the Rankine cycle? A cycle that converts heat into work, usually using water as the working fluid Used to generate 80% of the world’s electrical power Fundamental cycle of a steam engine

Picture taken from Basic Process for Rankine Cycle

Experimental Procedure Steam from LSU boiler  Steam Seperator  Turbine  Condenser  Pump  Boiler  repeat Take temperature and pressure measurements in between components

Turbine Compressor Vapor to Liquid

Calculations Low LoadHigh Load Mass Flow Rate0.025 kg/s0.027 kg/s Rate of Pump Work In15.5 W16.4 W Rate of Boiler Heat In66.1 kW71.2 kW Rate of Condenser Heat Out 64.2 kW69.0 kW Rate of Turbine Work Out 1.9 kW2.1 kW Turbine Efficiency26.1 %26.5 % Actual Cycle Efficiency2.8 %2.9 % Ideal Cycle Efficiency10.8 %11.1 %

Uncertainty Analysis Temperature: ± 4°C Pressure: ± 5% Mass flow: ± 10% Low LoadHigh Load Rate of Turbine Work 284 W133 W Actual Cycle Efficiency 0.137

Power Comparisons Low LoadHigh Load Power dissipated by light395 W620 W Rate of turbine work1.9 kW2.1 kW

Conclusions Steam trap, steam separator, wye strainer, pressure relief valves and other secondary parts – decrease the efficiency -adding entropy – Increase life of parts- up quality steam in turbine, filter out debris Error- – Major interpolation in steam tables – Inaccurate readings (psig meters do not measure <0psi)

Questions?

Appendices ME 3611 Laboratory Manual: Experiment 6 – Rankine Cycle Experiment mtable_sat.cfm