Chapter 6, Problem 6.9E

1) In a piston cylinder 0.5kg of air expand polytropically from 4 bar and 1100 oC to 1 bar, the index of expansion is 1.75, find the work done and the heat transfer. Example 2.13 A steam turbine operating under steady flow conditions receives 3600 kg of steam per hour. The steam enters the turbine at a velocity of 80 m/s, an elevation of 10 m and specific enthalpy of 3276 kJ/kg. It leaves the turbine at a velocity of 150 m/sec, an elevation of 3 m and a specific enthalpy of 2465 kJ/kg. Heat losses from the turbine to the surrounding amount to 36 MJ/hr. Estimate the power output of turbine.

a random sample of 83 reconstructed clay vessels from the turquoise ridge Thermo Dynamics How much entropy, in kJ/K, is transferred to 20 kg of helium at 20 degrees C if the temperature is increased by 28 degrees C. Note: the pressure is maintained constant. Please solve within 30 minutes.

Provide complete and clear solution for this problem.  A 5 kg air in a tank changes its temperature from 50oC to 250oC. What is the change in entropy KJ/K.  A. 1.23           B. 8.34          C. 4.23          D. 1.72 Answer: D

5.57 For the refrigerator of Example 5.2, apply Eq. 5.13 on a time-rate basis to determine whether the cycle operates reversibly, operates irreversibly, or is impossible. Repeat for the case where there is no power input. Surroundings at 22°C (295 K) Qn Weycle 3200 kJ/h Quick Handwritten format, Strictly don't use chatgpt. wwwwww Qc=8000 kJ/h Freezer compartment at-5°C (268 K) System boundary FIG. ES.2 80 =-0 cycle (5.13)

p46,#15 with illustration and explanation

7.2. In Ex. 7.5 an expression is found for the Joule/Thomson coefficient, μ = (@T/P)H₂ that relates it to a heat capacity and equation-of-state information. Develop similar expressions for the derivatives: (a) (@T/OP)S (b) (at lav)u What can you say about the signs of these derivatives? For what types of processes might these derivatives be important characterizing quantities?

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

Steam at 44 bar and a dryness fraction, x = 0.9 is throttled to a pressure of 12 bar. Calculate thedifference in power output in kilowatts between the following two expansion processes:a) Steam at the initial pressure of 44 bar and x = 0.9 at State 1 is expanded in a turbine to State 3 at 0.12 bar.b) Steam at the reduced pressure of 12 bar after throttling at State 2 is expanded in another turbine to State 4 at the same exhaust pressure of 0.12 bar.The mass flow rate of steam is 8 kg/sec in both cases and the expansion in both turbines can be assumed to be reversible and adiabatic. Sketch both expansion processes on the same T-s diagram using the respective initial and final state points as described above.Explain the reason for the difference in power output.Calculate the mass flow rate of steam for the turbine operating at the throttled/reduced pressure to generate the same output as the turbine operating at the pressure before throttling.NOTE: You are required to number the state…

Note: Show all your solutions in separate sheets as required. Indicate all of your answers on this page in the provided blank lines. 1. Using the Steam Tables, find and entropy of steam at the inlet and outlet of a boiler and heat added when subcooled water at pressure = 5 Mpaa (subcooled by 64 deg C measured at boiler inlet), is superheated to 100 deg C SH at the same pressure. Total flow volume rate of steam = 0.5 cu.m per sec. Indicate units.