Chapter 6, Problem 6.128EP

200 kPa pressure and 3 kg of saturated liquid and saturated steam mixture water at 50% degree are in a vertical piston cylinder arrangement. As a result of the heat transfer from the environment to the cylinder, the piston moves by increasing slowly at constant pressure and heat is transferred to the piston-cylinder arrangement until the volume reaches 3 times.Note: Take T (K) = 273.15 + ◦C and ambient temperature 25◦C.a) Draw the T-s diagram of the state change, show the temperature and entropies in the initial and final states on the diagram.b) Find the heat transfer, kj, to the system during the process.c) Find the total amount of entropy, kj / K, produced during this process.d) Consider whether a change of state is possible.

Thermodynamics

A spring-loaded piston-cylinder device contains  of m=1kg carbon dioxide. Initially, the spring has no force on the piston and , , . Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2,  , . The gas is an ideal gas. (8)What's the total boundary work   _____kJ ?

Saturated water vapor at 2.5 bar undergoes a process in a closed system to a final state where the pressure is 7.0 bar and the temperature is 180°C.  Can the process occur adiabatically? show calculations on why or why not.

A spring-loaded piston-cylinder device contains  of m=1kg carbon dioxide. Initially, the spring has no force on the piston and , , . Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2,  , . The gas is an ideal gas. (6) What's the boundary work against spring  _____in kJ?

0.05 kg of a certain gas in a piston and cylinder is compressed reversibly until the pressure reaches 0.615 MPa. The initial pressure and volume were 0.1025 MPa and 0.03 m3 respectively. Determine the final temperature, the work done on the gas, the heat flow to or from the cylinder walls. i) When the process is according to law PV1.4 = C, ii) When the process is isothermal. (the molecular weight of a certain gas is 44 and y = 1.3).

A spring-loaded piston-cylinder device contains of m=1 kg carbon dioxide. Initially, the spring has no force on the piston and P₁=500kPa, T = 150K, V₁ = 0.1m³. Heat is transferred to the gas, causing the piston to rise and to compress the spring. At the state 2, T₁=900K, V₂=0.3m³. The gas is an ideal gas. 2 (4)What's the boundary work against piston W ?_____in kj? b-p P1, V1, T1 P2, V2, T2

1 kg air undergoes reversible heating at constant P from Ti = 300K and Pi = 1 bar until the volume triples. Determine the Work for the process.(Cp = 29 J mol-1K-1)

Water (vapor) contained in a piston–cylinder assembly undergoes two processes in series from an initial state where the pressure is (1.6 MPa) and the temperature is (600 oC).  Process 1–2: The water is cooled at constant volume to (1200 kPa) .    Process 2–3: The water is cooled as it is compressed at a constant pressure  to the saturated liquid state a) Sketch both processes on T-v diagram b) For the overall process determine the work, in kJ/kg.   c) For the overall process determine the heat transfer, in kJ/kg.