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22-Mec-A1 Applied Thermodynamics and Heat Transfer: May 2016

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Stepped-Piston Pressure and Isothermal Steam Expansion
  2. Question 2 Combined Reheat / Regenerative Steam Cycle
  3. Question 3 Non-Ideal Brayton Cycle with Duct Pressure Drop
  4. Question 4 Freon-12 Refrigeration System from Test Data
  5. Question 5 Insulation Thickness to Cut a Steam-Tube Heat Loss
  6. Question 6 Oil-Heating Tube in Cross-Flow — Wall-Temperature Limit
  7. Question 7 Surface Temperature of a Power Transistor
  8. Question 8 Cross-Flow Tube-Bank Heat Exchanger (ε–NTU)

Start with Question 1 →

Reference texts: Çengel & Boles, Thermodynamics: An Engineering Approach (9th ed., McGraw-Hill) — closed- and open-system energy balances, steam tables, vapour and gas power cycles, and vapour-compression refrigeration; Çengel & Ghajar, Heat and Mass Transfer (6th ed.) and Incropera, DeWitt, Bergman & Lavine, Fundamentals of Heat and Mass Transfer (8th ed., Wiley) — cylindrical composite-wall conduction, internal-flow and cross-flow convection correlations, natural convection with radiation, and the ε–NTU heat-exchanger method. Freon-12 property data are taken from the appendix supplied with the exam; steam, air and engine-oil data from standard tables.

Paper format: National Examination 07-Mec-A1, 3 hours, open book. Part A — Thermodynamics (Q1–4); Part B — Heat Transfer (Q5–8). Each answer carries equal value; a complete paper is any five (three from one part, two from the other). All eight questions are solved in full below.