FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Consider a heat transfer process of the steady form that occurs along a plain wall.
While the inner room temperature was kept at 25 °C, the outdoor environment temperature
was measured to be 2 °C. If the heat transfer at this plain wall in an hour is 3,528 kJ,
determine the.total exergy destruction per unit time (the rate), which occurs during this heat
transfer process, a) use the total entropy generation to find the rate of the total exergy
destruction in the room (i.e.., use the entropy balance), b) use the exergy balance to find the
rate of the total exergy destruction in the room
Answer were given all i need is the correct solution thank u
During an isentropic process of 3 lb/sec of air,
the temperature increases from 50 deg F to 290
deg F. Find the work for a steady flow process.
O-134416.8 BTU/s
O-143416.8 BTU/s
O-199.28 BTU/s
O -172.74 BTU/s
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- 78 kg of water vapor is found as saturated vapor at 650 kPa pressure in a cube-shaped container with a fixed volume. The cube lost heat and its pressure dropped to 325 kPa. Since the environmental conditions are 100 kPa 25 ºC, find the exergy change of the steam in the first and the last state, the exergy change in the steam, the exergy destruction and the second-law efficiency for this process change.arrow_forwardOnly question 4 please!arrow_forwardA pressure cooker 6 litres in volume contains 5 kg of water, where the liquid is in equilibrium with the vapour above it, at 30°C. The cooker with its lid closed and weight on, is heated until the vapour produced results in an increase in pressure, and the weight just lifts up at 2 bar. i. If the flame heating the cooker is at 400°C, calculate the entropy generation due to the external irreversibility. Calculate the heat transferred in the process. ii. Assume that the heating of water is reversible; neglect heating of the cooker body; assume heat transfer to water takes place at its average temperature for the above process. Use property data given below.arrow_forward
- Air enters an adiabatic nozzle at 230 kPa, 600°C with a velocity of 60 m/s. The air is at 70 kPa, 450°C at the exit of the nozzle. Model the air as an ideal gas having variable specific heat, using values from Cengel's tables posted on Canvas. a) Find the exit velocity of the air (answer: 577.1 m/s). b) Find the isentropic efficiency of the nozzle (answer: 0.643).arrow_forwardA turbine expands air adiabatically from 6 bar 400 K, 200 m/s, to 1 bar, 290 K, 50 m/s. Determine the actual work output and the maximum possible work output for the above operating conditions. Also find the irreversibility of the process. Take surrounding atmosphere to be at 1 bar and 280 Karrow_forwardAir enters an adiabatic nozzle at 230 kPa, 600°C with a velocity of 60 m/s. The air is at 70 kPa, 450°C at the exit of the nozzle. Model the air as an ideal gas having constant specific heats, using 300 K values from Cengel's tables posted on Canvas. a) Find the exit velocity of the air (answer: 552.4 m/s). b) Find the isentropic efficiency of the nozzle (answer: 0.599).arrow_forward
- Two kg water at 95°C with a quality of 40% has its temperature raised 15°C in a constant volume process. What is the new specific entropy? Select one: a. 3.618 kJ/kg K b. 4.015 kJ/kg K c. 6.747 kJ/kg K d. 5.232 kJ/kg Karrow_forwardA piston-cylinder device contains 3 kg of R-134a fluid at 100 kPa and 0.6 quality conditions. The system is heated up by an external heat source at 600 K. If the destroyed exergy is 30 kJ and ambient temperature is 300 K, find Final pressure, entropy generation, heat input and final dryness.arrow_forwardSteam @ 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 actual exit velocity (m/s)?arrow_forward
- heat engine used a steam as working fluid has 3 kg/s and initial the steam undergoes to expansion process is 8 bar, dryness fraction ( 65) percent , and the expansion follows the law (PV¹.¹-C), down to a pressure of 0.3 bar. Calculate the change of entropy of steam during the process.arrow_forwardA steam turbine receives water at 3 MPa, 400oC at a rate of 1 kg/s. The steam enters with velocity of 10 m/s at an elevation of 10m above ground level. The steam exits the turbine at 0.1 bar, with 10% moisture content. The velocity of the steam at the exit is 30 m/s and at elevation of 4 m above the ground level. Find the total turbine power output.arrow_forwardSteam (P=100KPa, T=300 deg C, 3 kg) is in a well-insulated piston-cylinder device. The system is cooled (10,000 kJ removed) until all the water is a compressed liquid at 80 deg C. How much work was required (kJ)?arrow_forward
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