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17-Phys-B6 Applied Thermodynamics and Heat Transfer: Undated paper

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

  1. Question 1 Polytropic Gas Expansion (Part a) and Ammonia Throttling (Part b)
  2. Question 2 Two-Stage Steam Turbine with Extraction and Reheat
  3. Question 3 Air-Standard Two-Turbine Cycle with a Gas-to-Gas Heat Exchanger
  4. Question 4 R-134a Vapour-Compression Refrigeration Cycle
  5. Question 5 Minimum Composite-Window Thickness for a Self-Cleaning Oven
  6. Question 6 Air-Cooling Coil Submerged in an Ice/Water Thermal-Storage Tank
  7. Question 7 Vertical Power-Amplifier Case — Combined Natural Convection and Radiation
  8. Question 8 Sizing a Sh​ell-and-Tube Heat Exchanger — Number of Tubes and Passes

Start with Question 1 →

Paper format. 17-Phys-B6 Applied Thermodynamics and Heat Transfer, National Examinations, May 2019 — a three-hour open-book examination; candidates are expected to bring both a thermodynamics text and a heat-transfer text to make use of the property tables and graphs the exam supplies. A complete examination is five questions — either three from Part A (Thermodynamics, Q1–Q4) and two from Part B (Heat Transfer, Q5–Q8), or two from Part A and three from Part B — every question carrying equal value; all eight are solved below as a complete study set.

Reference texts. Y. A. Çengel and M. A. Boles, Thermodynamics: An Engineering Approach, 8th ed. (polytropic closed-system processes, throttling, Rankine-cycle reheat/extraction turbines, air-standard Brayton-cycle energy balances, vapour-compression refrigeration); F. P. Incropera and D. P. DeWitt, Fundamentals of Heat and Mass Transfer, 7th ed. (composite plane-wall conduction with convection and radiation at both faces, combined entry-length internal convection, natural convection with radiation from a vertical plate, sh​ell-and-tube heat exchanger sizing via the LMTD correction-factor method). Ammonia, steam and R-134a property values were computed (Bell et al., IAPWS-95 / REFPROP-quality equations of state) and cross-checked against the printed saturated-ammonia appendix table on page 6 of the source exam, which it matched to 3–4 significant figures.