Chapter 7, Problem 7.3P

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

20. If 10 kg/min of air are compressed isothermally from P1 = 96 kPa and Vi 7.65 m³/min to P2 = 620 kPa, find the work, change in entropy %3D for a non-flow process and a steady flow process with vị = 15 m/s and v2 = 60 m/s.

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)

200Kg/min superheated steam at 40 bar and 350C enters a turbine through a 7.5cm ID pipe. It exits at 5bar as saturated steam through a 5cm ID pipe neglect the change in potential energy of the system. What is the temperature of the outlet saturated system? How much energy is transferred to or from the turbine?

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Q6 (a) What happens to the entropy if an expansion process undergoes an internally reversible and adiabatic manner? Sketch the process and plot the initial and final state on a T-s diagram.

1. A heat pump design creates a heating effect of 35 kW while using 15 kW of electrical power. wwww wwwwn wwwww w The thermal energy reservoirs are at 300 K and 250 K. www ww (a) Show the system sketch and label all the values given on it ww www u w w (b) Demonstrate the 1st law application for this system (c) Find entropy generation

Q3. 1000 kJ of heat are transferred irreversibly and isothermally at atemperature of 800 K. The temperature of surrounding is 300 K. a. What is the maximum work that can be obtained frome this isothermal heat transfer? b. What is the amount of heat that regected to the surrounding? c. What is the entropy change of the two reservoirs? d. What is the total entropy change? Ans: a. 625 kJ b. 375 kJ c.-1.2, 1.25KJ/k d. zero