4 Data Processing 30 Marks Using The Data Provided In The Appendix Complete The Following Calculate The Ideal Carnot 1 (216.75 KiB) Viewed 37 times
4: Data Processing [30 marks] Using the data provided in the Appendix complete the following: Calculate the ideal Carnot cycle efficiency of the engine for the five different conditions which have been tested. Please sketch a temperature entropy diagram as part of your answer, and clearly show your calculations, specifying any assumptions you need to make (if any). Produce a Willans line from all the recorded set-points. The Willans line is a plot of steam flow in kg/h on the Y-axis, and engine power in Watts on the x-axis (from all the five loading conditions the engine went through). This allows you to approximate the engine losses. You do this by extrapolating the line to cross with the x axis. The point where the line intersects with the x-axis gives an indication of the approximate engine losses. Be careful with the units on this one; mass flow is recorded as ml/min, so you'll need to convert to mass. ● Produce a specific steam consumption vs. engine power plot from all the recorded set points. In this plot, the specific steam consumption (kg/kWh) is on the Y-axis, and the engine power in Watts is on the x-axis. Perform a Rankine Cycle analysis for the set point at the highest torque, calculating the cycle efficiency. Note that there are at least a few different methods to calculate the Rankine cycle efficiency, each requiring their own assumptions. Briefly, explain what assumptions you've taken, and in the best case, calculate the efficiency using more than one method so you have something to compare in the analysis of the report. Please sketch a temperature entropy diagram as part of your answer, and clearly show your calculations. Also attempt to calculate the isentropic efficiency of the steam engine (compare against the Carnot Cycle efficiency in your analysis section).
Boiler Motor T1 T2 T3 Pressure Pressure °℃ kN/m² PC kN/m² °C °C 300 105 143321.8 41 Motor Motor Heater Torque Speed Power Power Condensate Condensate Flow Temperature °C ml/min Nm RPM W W 0.1 1990 22 3000 66 21.7 90.1 21.7 295 140 143 21.2 44.7 90.7 0.21 1970 45 3000 75 0.3 1910 64 3000 84 20.6 300 165 143.3 20.6 48.191.6 0.36 1960 74 3000 88 88 20.5 290 185 142.4 / 19.9 49.6 92.1 0.42 1980 88 3000 90 90 20.2 290 200 142.3 19.5 51.1 92 Dryness Fraction Experiment Boiler Pressure = 285 kN/m², Boiler Temperature = 143 °C, Calorimeter Temperature = 103.7 °C T (extra), Engine Exit °C T4
Join a community of subject matter experts. Register for FREE to view solutions, replies, and use search function. Request answer by replying!