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22-Mec-A1 Applied Thermodynamics and Heat Transfer: May 2013

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

  1. Question 1 Helium Three-Process Cycle
  2. Question 2 Two-Stage Reheat Steam Turbine with Extraction
  3. Question 3 Double-Acting Air Compressor with Clearance
  4. Question 4 Window Air Conditioner Using Freon-12
  5. Question 5 Critical Radius of Insulation on a Hot-Water Pipe
  6. Question 6 Heat Loss from Air Flowing in a Square Duct
  7. Question 7 Surface Temperature of an Electric Charcoal-Lighter Element
  8. Question 8 S​hell-and-Tube Heat Exchanger (Water Heated by Air)

Start with Question 1 →

Paper: National Examinations — 07-Mec-A1 Applied Thermodynamics and Heat Transfer, May 2013. Open-book, 3-hour paper. Part A (Thermodynamics, Q1–Q4) and Part B (Heat Transfer, Q5–Q8); a complete paper is any five questions — three from one part and two from the other. Full worked solutions to all eight questions are given below.

Reference texts: Çengel & Boles, Thermodynamics: An Engineering Approach (9th ed., McGraw-Hill) — gas cycles, steam tables, reheat Rankine 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) — conduction with critical radius, natural-convection and internal-flow correlations, and the ε–NTU heat-exchanger method. Freon-12 and steam property data are taken from the appendix supplied with the exam and standard tables.