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Consider a turbine operating at steady-state with the operating conditions shown in the figure. Superheated water vapor enters the turbine with a mass flow rate of m = 5 and superheated water vapor exits at p2 and T2. Ignoring stray heat transfer and kinetic and potential effects: a. Calculate the net power of the turbine, Wr, in kW b. Calculate the entropy produced in kW/K All state properties needed to solve are provided below: State T (°C) p (bar) h (kJ/kg) s (kJ/kg-K) (1 1 240 10 2920.4 6.8817 Wr 2 160 3 2782.3 7.1276 P1 = 10 bar T = 240 °C = 3 bar (2) P2 T2 = 160 °C

13. Calculate the heat transfer, in Btu/lbm, for the reversible process 1-3 shown in Fig. 2.11. SHOW-FREE BODY DIAGRAM 3 MPa 2 kgls uhine s00 AP. 100°C Fig. 2.11 Fig. 2.12

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Identify the working substance, specify the kind of system and sketch the system boundary.  PLEASE ANSWER it in 1hr.

solve the following problem: Steam enters a turbine operating at steady state at 850oF and 450 lbf/in2 and leaves as a saturated vapor at 1.4 lbf/in2. The turbine develops 12,000 hp, and heat transfer from the turbine to the surroundings occurs at a rate of 2 x 106 Btu/h. Neglect kinetic and potential energy changes from inlet to exit. Determine the exit temperature, in oF, and the volumetric flow rate of the steam at the inlet, in ft3/s.

3. Air is contained within a piston-cylinder assembly The cross sectional area of the piston is 0.01 m². Initially the piston is at 1 bar and 25°C, 10 cm above the base of the cylinder. In this state, the spring exerts no force on the piston. The system is then reversibly heated to 100°C. As the spring is compressed, it exerts a force on the piston according to: F=-kx where k= 50,000 N/m and x is the displacement length from its uncompressed position. Determine the work done. a. -166 J b. -216 J c. 166 J d. 216 J

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An ideal gas fills a piston-cylinder device, being initially at a certain state 1, with known pressure P1 and specific volume v1. The piston is then pushed downwards, compressing the gas inside the cylinder isothermally and reversibly, until a pressure P2 is achieved. Assume: kinetic, potential, and any other form of energy being zero, except internal thermal energy; no energy generation/depletion inside the domain; constant specific heat, and, known gas constant R. Determine the change in specific entropy undergone by the gas, in terms of P1, P2, and R. Also, show the process in a T-s diagram indicating initial and final states

2. Water is heated in a boiler tube at steady state from an inlet state of 500 kPa 25 deg-C (State-1) to an exit state of 500 kPa, 500 deg-C (State-4). Neglect changes in ke and pe, and use the PC model to answer these questions. If the mass flow rate of water is 5 kg/s Hide Details (a). Determine the rate of heat transfer in kW KW Enter answer as a decimal number (3.14, 5.0, -2.78, 5, for example) (b) What percent of the heat transfer is used to to boil the water from saturated liquid to saturated vapor state? Enter answer as a decimal number (3.14, 5.0, -2.78, 5, for example) (c) What percent of the heat transfer is used to heat up water to saturated liquid state? Enter answer as a decimal number (3.14, 5.0, -278, 5, for example)

An insulated mixing chamber receives 2 kg/skg/s R-134a at 1 MPa, 100 ∘C in a line (state-3). Another line brings 1 kg/s of R-134a as saturated liquid at 70 ∘C (state-1), which is throttled to a pressure of 1 MPa (state-2) before it enters the mixing chamber. At the exit (state-4), the pressure is 1 MPa. a)Determine the entropy generated by the mixing chamber, (S˙gen,mixing). b)Determine the entropy generated in the system’s universe (S˙gen,univ).

Problem 22.3 Air is contained inside a simple piston cylinder device as shown in the figure. It expands from state 1 to state 2 according the process information shown below: State 1: P₁= 200 kPa; ₁ = 0.5 m³; T₁ = 300 K Process 1-2: Expansion process (see graph) where P = 50 kPa + (300 kPa/m³) State 2: P₂ = 350 kPa; ₂ = 1.0 m³ Determine: the work done on or by the air contained in the piston-cylinder device, in kJ (indicate direction, i.e., is the work done on or by the air?) Air P 350 kPa 200 kPa 1 0.5 1.0 Ans: d) 185 kJ <≤ Wnet] ≤ 200 kJ K

What is the work of the compressor in KJ/kg?