PS2 Solutions

# PS2 Solutions - MAE 105A Introduction to Engineering...

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Unformatted text preview: MAE 105A Introduction to Engineering Thermodynamics Winter 2008 - Problem Set 2 1. A closed system of mass 3 kg undergoes a process in which there is a heat transfer of 150 k] from the system to the surroundings. The work done on the system is 75 k]. If the initial speciﬁc internal energy of the system is 450 kJ/kg, what is the ﬁnal speciﬁc internal energy, in kJ/kg? Neglect changes in kinetic and potential energy. 2. {Problem 2.56 in Moran & Shapiro] As shown in Fig. P256, 5 kg of steam contained within a piston—cylinder assembly undergoes an expansion from state 1, Where the speciﬁc internal energy is u1 = 2709.9 kJ/kg,t0. state 2, where a; = 2659.6 kJ/kg. During the process, there is heat transfer to the steam With magnitude or'so kJ. Also, a paddle wheel transfers energy to the steam by work in the amount of 18.5 kJ. There is no signiﬁcant change in the kinetic or potential energy of the steam. Determine the energy transfer by work from'the steam to the piston during the process, in k]. 3. Air is contained in a rigid well—insulated tank with a volume of 0.6 mg. The tank is ﬁtted with a paddle wheel that transfers energy to the air at a constant rate of 4 W for l h. The initial density of the air is 1.2 kg/m3. If no changes in kinetic or potential energy occur, determine (a) The speciﬁc volume at the ﬁnal state, in mB/kg. (13) Energy transfer by work, in kJ. (c) Change in speciﬁc intemal energy of the air, in kJ/kg. 4. Determine the quality of a two-phase liquid—vapor mixture of (a) H20 at 100°C with a speciﬁc voiume of 0.8 m3/kg. (b) Refrigerant 134a at 0°C with a speciﬁc volume of 0.7721 cm3 / g. (c) Ammonia at -40°C-with a speciﬁc volume _of l m3/kg. (d) Refrigerant 22 at 1 MPa with a speciﬁc volume of 0.0054 m3/kg. 5. A closed vessel with a volume of 0.018 m3 contains 1.3 kg of Refrigerant 22 at 10 bar. 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## This note was uploaded on 04/02/2008 for the course MAE 105a taught by Professor Marner during the Winter '08 term at UCLA.

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PS2 Solutions - MAE 105A Introduction to Engineering...

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