This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: MEAM 203 FALL 2002 THERMO – FINAL EXAM Closed books. Answer all four questions. Write clearly! Explain all steps. Answers without clear explanation will be discounted. GOOD LUCK . (30%) 1. An adiabatic compressor compresses vapor water from a saturated state at 1MPa to 17.5MPa. The vapor exits the compressor at 650C. The ambient temperature is 300K, and the relevant thermodynamic data is given in the table at the end of the problem. Per unit mass of vapor, determine: (5 %) (A) The compressor’s actual work. (5 %) (B) The availability of the vapor at the compressor’s inlet conditions. (5%) (C) The availability of the vapor at the compressor’s exit conditions. (5%) (D) The reversible work. (5%) (E) The process irreversibility. (5%) (F) The second law efficiency. Pressure (MPa) Temperature Enthalpy (kJ/kg) Entropy (kJ/kg-K) 1 Saturated vapor 2778 6.59 17.5 650C 3694 6.74 0.1 300K 105 0.37 (30%) 2. A reversible compressor compresses CO 2 from 1.4MPa and 320K to 2MPa and 270K. Assume that the CO 2 behaves like an ideal gas with the temperature-independent specific heats Cp=0.84 kJ/kg-K and Cv=0.65kJ/kg-K and neglect changes in kinetic and potential energies. Cp=0....
View Full Document
- Spring '08
- Entropy, unit mass, well-insulated compressor exchanges, CO2 gas constant