Chapter 7, Problem 7.65P

(6).draw a figure also, and explain each step by step solution.

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Steam @ 500 C and 3500 kPa enters a nozzle at a velocity of 30 m/s and leaves as saturated vapor at 100 kPa, steam experiences a heat loss of 128 kg/ş to the surroundings which are at 25 C. What is the amount of entropy generation (kJ/kg.K)? Select one: A. 0.6291 B. 0.5473 C. 0.2299 D. 0.7424 E. 0.1996

Personal Hotspot : 1 connection(s),Used 41.0 MB Photos 1235/1236 0.05 kg of steam at 10 bar, dryness fraction 0.84, is hcated reversibly in a rigid vessel until the pressure is 20 bar. Calculate the change of entropy and the heat supplied. Show the area which represents the heat supplied on a T-s diagram. Send Set as Add to Edit Delete 发

8.6 Nozzle Flow of Air In a jet engine, hot combustion product (treat as air) enters the nozzle at 1500 K, 4 bar and is adiabatically expanded to the outside pressure of 0.5 bar. Determine outflow velocity and temperature for a reversible nozzle and for an irreversible nozzle with isentropic efficiency of 0.94.

An open feedwater heater is a direct-contact heat exchanger used in vapor power plants. Shown in the figure below are operating data for an open heater with H,0 as the working fluid operating at steady state. Ignoring stray heat transfer from the outside of the heat exchanger to its surroundings and kinetic and potential energy effects, determine the rate of entropy production, in kW/K. (Hint: Use the first law to find the mass flow rates) Also determine state point 1 and 2 on a T-s diagram, then mix them and show the outcome is 3. Show 3 on the T-s diagram. P2 = 3 bar x2 = 0.92 (2) P3 = 3 bar saturated liquid m3 = 80 kg/s P1 = 3 bar T1 = 36°C Open Feedwater (3) Heater

Example 7: Throttling Water is throttled from 1 bar, 60 °C, to 0.5 bar, and to 0.1 bar. In each case calculate the exit temperature and the entropy generation. ab k 11°C Mostly cloudy Esc FnLock 1 1 2 Q FI A Z @ 2 W S # 3 X Saluting ‒‒ - E D Q Search F4 $ 4 C R F V 6 G V B & 7 H FB U N * 8 J F9 1 ( 9 F10 K M O F11 O P JE 3 ; + ( O [ 4x 11 ? 1 9:49 AM 11/1/2023 Delete A Backspace 0 En

8.5 Adiabatic Throttle As part of a cooling cycle, CO2 is throttled from 20°C, 7 MPa to 2.5 MPa. Determine temperature, specific volume, enthalpy, and entropy of initial and end state, and put all in a table. Determine the entropy generation per unit mass and estimate the corresponding work loss.

02/ A metal with 1.5T, k cooled to 300 k by transferring heat to environment at T = 27" Describe the irreversibility and the reversible work during the process, assume the weight and specific heat of metal are 250 kg and 422 1/kg.k.