Problem T3. (Unified Thermodynamics)
Consider two quasi-static expansion processes, one adiabatic, the second isothermal for a
closed system containing air at T1 = 300K, v1 = 1 m3/kg. At the end of both expansion
processes, the specific volume, v2 = 10 m3/kg. Assume that cp = 1.0035 kJ/kg-K, cv =
0.7165 kJ/kg-K, and R = 0.287 kJ/kg-K.
a) Sketch both processes on p-v and T-v diagrams.
b) For each process determine p2 and T2.
c) For each process, determine the work done by the system and the heat transferred to
the system.
d) For each process calculate the change in enthalpy of the air.
e) What is the difference between heat and temperature?
(LO#4, LO#5)
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