FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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4. An evaporator has R-410A at -20°C and quality 80% flowing in. The exit flow is saturated vapor at
-20°C.
a. Consider the heating to be a reversible process and find the specific heat transfer from the
entropy balance. (Answer: 48.7 kJ/kg)
b. If the heat source was at -10°C and the inlet and outlet streams still have the same properties as
in a), calculate the specific entropy generation? (Answer: 7.33 J/(kg K))
where do thet get the enthropy valvue for S2?
Steam to a turbine at a mass flow rate of 1.4 kg/s, 700 kPa pressure and 400 °C
enters the temperature. Steam at 100 kPa pressure and 1.4 m3/kg specific volume
exits the turbine. Heat transfer from turbine to environment 50 kW, with turbine
Since the boundary temperature between the environment is 70 °C,
a) Find the power produced by the turbine, entropy produced in the turbine and isentropic efficiency of the turbine.
Note: The changes in kinetic and potential energies will be neglected and
T (K) = 273 + °C will be taken.
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- 3. An adiabatic compressor takes argon from 100 kPa, 300 K to 2000 kPa. The compressor efficiency is 80%. (a) Find the outlet temperature (K) and the work (kJ/kg) (b) Find the entropy generation (kJ/kg-K)arrow_forwardThermodynamics sketch and label the turbine. Sketch and label the process on a T-s diagram also mentions all numbers on the process please. Thanks 7.56 A steam turbine has an inlet of 2 kg/s water at 1000 kPa, 400°C with velocity of 15 m/s. The exit is at 100 kPa, 150°C and very low velocity. Find the power produced and the rate of entropy generation.arrow_forwardThere are required 2000 kW of compressor power to handle air adiabaticallyfrom 1 atmosphere, 27 oC, to 305 kPaa. The initial air velocity is 20 m/s and the finalvelocity is 85 m/s. a) If the compression is isentropic, find the compressor capacity, inm3/s. b) If the compression process is irreversible adiabatic to a temperature of 160 oC,with the capacity found in c), determine the compressor power input, in Hp.arrow_forward
- 2. 1 kg/s steam enters the turbine at 2.5MPa and 500C while leaving at 10kPa with 89% quality. The pump exit condition is at 2.5 MPa and 50C. Find the turbine work output and heat added in the boiler in kW. (20 points)arrow_forwardi need the answer quicklyarrow_forwardA steam turbine has an inlet of 2 kg/s water at 1000 kPa, 350°C and velocity of 15 m/s. The exit is at 100 kPa, x = 1 and very low velocity. Find the specific work and the power produced.arrow_forward
- An isentropic turbine process 5kg/s of steam at 4MPa, which is exhausted at 50kPa and 100 C. Five percent pf this flow is diverted for feedwater heating at 700kPa. Find the power produced by the turbine.arrow_forwardone kg of air is compressed in a cylinder according to the law PV^1.3= constant. If intital temperature is 100°C amd compression ratio is 15, find the work done and change in entropy of air.arrow_forwardAir enters an insulated compressor at ambient conditions, 100 kPa, 20oC at the rate of0.2 kg/s and exits at 500 K. The isentropic efficiency of the compressor is 70%. Whatis the exit pressure? How much power is required to drive the compressor? Assumespecific heats at room temperatures.arrow_forward
- I do not understand the chapter in general. May you please explain why you completed each step as you have. Thank you.arrow_forward40°C 4. A mixing chamber receives 5 kg/min of ammonia as saturated liquid at -20°C from one line (1) and ammonia at 40°C, 250 kPa from another line (2). The chamber also receives 325 kJ/min of energy as heat transferred from a 40°C reservoir as shown in figure. At the outlet, ammonia leaves as saturated vapor at -20°C. Find the mass flow rate in second line and calculate the total entropy generation in the process. Is this process possible?arrow_forwardA mass-loaded piston/cylinder shown in figure containing air is at 300 kPa, 17°C with a volume of0.25 m³ while at the stops V = 1 m³. An air line, 500 kPa, 600 K, is connected by a valve that is then opened until a final inside pressure of 400 kPa is reached, at which point T = 350 K. Find irreversibility assuming that heat transfer is with the surroundings at 17°C.arrow_forward
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