Air goes through a polytropic process in a piston/cylinder setup. The polytropic index is n. The...
Air goes through a polytropic process in a piston/cylinder setup. The polytropic index is n. The process starts at P1 kPa, T1 oC, and ends with a pressure of P2 kPa.
Answer Questions 6-8 about this process, considering the given information in Question 6. Assume air to be an ideal gas.
Let,
n=1.5
P1=2.3 MPa
T1= 8.9 ×102 °C
P2=2.1 ×102 kPa
Cp = 1.004 kJ/kg-K,
Cv = 0.717 kJ/kg-K,
R = 0.287 kJ/kg-K
Find the final temperature, in oC
(Provide the answer with TWO decimal points)
2) Considering the given information in Question 6, calculate the specific work, in kJ/kg.
3) Considering the given information in Question 6, calculate the specific heat transfer, in kJ/kg.
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Air goes through a polytropic process in a piston/cylinder
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An air-standard cycle is
executed within a closed piston–cylinder system, and it consists of
the following three processes: 1–2 V = Constant heat addition from
100 kPa and 30°C to 850 kPa 2–3 Isothermal expansion until V3 =
8.5V2 3–1 P = Constant heat rejection to the initial state Assume
air has constant properties with cv = 0.718 kJ/kg·K, cp = 1.005
kJ/kg·K, R = 0.287 kJ/kg·K, and k = 1.4.
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