Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. 98-Phys-B6 Applied Thermodynamics and Heat Transfer, National Examination December 2017 — 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. 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. Candidates are invited to state any assumptions where a question is open to interpretation; this licence is used explicitly in Question 4 (the exam's own printed text is ambiguous about whether the piston displacement is 1.00 m³, read here as the intended value) and Question 6 (the external air stream is treated as an effectively infinite, constant-temperature reservoir since no air mass flow rate or duct is specified).
Reference texts. Y. A. Çengel and M. A. Boles, Thermodynamics: An Engineering Approach, 8th ed. (two-phase closed systems, flash chambers, steam turbines, vapour-compression refrigeration, reciprocating compressors); F. P. Incropera and D. P. DeWitt, Fundamentals of Heat and Mass Transfer, 7th ed. (composite cylindrical conduction, internal and external forced convection correlations, natural convection from a vertical plate, heat-exchanger LMTD analysis). Saturation and superheat property values below were computed (Bell et al., IAPWS-95 / REFPROP-quality equations of state for water, ammonia and R134a) and cross-checked against the printed appendix tables on pages 5–8 of the source exam, which they matched to 3–4 significant figures throughout.
