22-Mec-B3 Energy Conversion and Power Generation, Undated paper: worked solutions

Paper format. National Examinations, May 2019 — 16-Mec-B3 Energy Conversion and Power Generation. Three hours, closed book. Section A is calculative (Questions 1–5) and Section B descriptive (Questions 6–8); candidates answer four questions from Section A and two from Section B, six questions of ten marks each for a total of sixty. Reference data for particular questions are bound in as pages 10–17, reference formulae and constants as pages 18–21, and steam tables from Thermodynamics and Heat Power are supplied. All eight questions are solved here.

Reference texts.

Granet & Bluestein, Thermodynamics and Heat Power, 6th ed. — steam tables, vapour and gas power cycles (the tables bound into this paper).
El-Wakil, Powerplant Technology — steam generators, gas-turbine and combined-cycle plant, wind and hydro conversion, plant siting and environmental impact.
Çengel & Boles, Thermodynamics: An Engineering Approach, 9th ed. — regenerative Rankine cycles, Brayton-cycle modifications, isentropic and internal efficiencies.
Çengel & Ghajar, Heat and Mass Transfer — heat-recovery steam generator temperature profiles and pinch analysis.
Manwell, McGowan & Rogers, Wind Energy Explained, 2nd ed. — actuator-disc theory, the Betz limit and power coefficients.
Natural Resources Canada, Canadian Renewable Energy Atlas, and CNSC REGDOC series — Canadian generation mix, siting and licensing context for Question 8.

The combustion balance of Question 1 returns a gas mass flow of 125.4 kg/s, which matches the 125 kg/s that Question 2 states. Readings taken from printed charts are identified explicitly wherever they occur.

Check: water and steam properties used below are IAPWS values, the formulation the bound Granet & Bluestein tables tabulate; every reading agrees with those tables to better than 0.1 %, comfortably inside the paper’s own rounding. Where a value had to be read off a printed chart (the Page 13 power curve and the Page 14 efficiency curves) the reading is stated explicitly and carries roughly ±1 % of graph-reading uncertainty. Every boxed result is recomputed from the question’s own data for this paper.

22-Mec-B3 Energy Conversion and Power Generation: Undated paper