Chapter 6, Problem 6.6P

4.54 kg mass of water vapor at 100kPa (abs) and an entropy of 8.0333 kJ/kg K; undergo a process at constant pressure to a state where the occupied volume is 1.62 m3/kg. It is requested: a. Plot t-V diagram b. Find the initial temperature (°C) c. Find the quality (%), moisture (%) and final internal energy (kJ)

4.27 A 400-L tank, A (see Fig. P4.27) contains argon gas at 250 kPa, 30°C. Cylinder B, having a frictionless piston of such mass that a pressure of 150 kPa will float it, is initially empty. The valve is opened and argon flows into B and eventually reaches a uniform state of 150 kPa, 30°C throughout. What is the work done by the argon? Po 8 Argon A FIGURE P4.27 B

A non-flow reversible process occurs for which pressure and volume are correlated by the expression p = (V2 + 6/V) where p is in bar and V is in m³. What amount of work will be done when volume changes from 3 to 5 m³?

4.17.) The volume of a compressible fluid system changes from V, = 1 ft³ to V2 = 5 ft3 during an internally reversible process in which the pressure varies a p = (100/V + 50) psia when V is in ft3. (a) For the process find -S Vdp and SpdV. (b) If the process is steady flow with AK = 5 Btu, AP = -2 Btu and AH = 120 Btu, find the work and heat. (c) If the process is nonflow, find W, Q and AU.

ygotins lo 6.69) By injecting liquid water into superheated steam. the desuperheater shown in Fig. P6.69 has a saturated vapor stream at its exit. Steady-state operating data are provided in the accompanying table. Stray heat transfer and all kinetic neand potential energy effects are negligible. (a) Locate states to 1, 2, and 3 on a sketch of the T-s diagram. (b) Determine the rate of entropy production within the de-superheater, K.Modelthe in kW/K. ideal as State p(MPa) T°C) ) v × 10³(m³/kg) u(kJ/kg) h(kJ/kg) s(kJ/kg · K) 1 38 1.0065 X 10-3 166.5 168.3 0.5658 1B 0.1308 320 sat. vap. Y2807.9 3069.5 6.8452 3 1.5 1.159 2519.7 2693.6 7.2233 Desuperheater bol Liquid बेे कत 60°C. Det heet ni water 3. Saturated fos vapor P6.4recom O lo lguons 2 Superheated- vapor honor m2 = 0.03 kg/s motava bogisins odt 1ol,nW ni

Thermodynamics I

(b) Velocity ratio of a machine is 72. The law of machine is P=1/48 W+30 N. Find the maximum MA, efficiency and state whether machine is reversible.

A perfect gas undergoes a process according to the law, Tc 2/5 V d0. Initial pressure and volume are 1 bar and 0.14 m respectively. After the process the volume of the gas becomes 0.07 m°. Find the work done during the process and its final pressure. Assume, R = 287 Nm/kg K.

A liquid expands reversibly in keeping with a linear regulation from 4.5 bar to 2 bar. The preliminary and very last volumes are 0.008 m^3 and 0.03 m^3. The fluid is then cooled reversibly at regular pressure, and subsequently compressed reversibly in keeping with a regulation pv regular again to the preliminary situations of 4.5 bar and 0.008 m^3. Calculate: a) the volume at the start isothermal compression. b) the work completed in every process, and c) the network of the cycle. Assume liquid as fluid