FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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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)
Sketch and label the nozzle. Sketch and label the process on a P-v diagram, also mention all numbers on the process of P-V diagram please.
7.15 The exit nozzle in a jet engine
receives air at 1200 K, 150 kPa with negligible kinetic energy. The exit pressure is 80 kPa, and the process is reversible and adiabatic. Use constant specific heat at 300 K to find the exit velocity.
Air enters an automotive supercharger at 100 kPa, 300 K and is compressed to 150 kPa. The efficiency is 70%. What is the required work input per kilogram of air? What is the exit temperature?
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- A pump operates between 100kPa and 10MPA. If the mass flow rate of the pump is 20.8 kg/s, and the isentropic efficiency is 92%, find the required pump power, in hp. Note that 1kW = 0.746hp. %3Darrow_forwardSteam 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.arrow_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, 150 °C and very low velocity (assume zero). Find the specific work (kJ/kg) and the power (kW) produced.arrow_forward
- The turbine section in a jet engine receives gas (assume air) at 1200 K, 800 kPa with an ambient atmosphere at 80 kPa. The turbine is followed by a nozzle open to the atmosphere and all the turbine work drives a compressor receiving air at 85 kPa, 270 K with the same flow rate. Find the turbine exit pressure P₂ so the nozzle has an exit velocity of 800 m/s.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_forwardPlease be very detailedarrow_forward
- A twin-cylinder, double-acting,compressor with a clearance of 5% draws in oxygen at 450 kpa,17c and discharges it at 1800 kpa. The mass flow rate is 20 kg/min, compression and expansion are polytropic with n=1.25. Find (a) the work,(b)the heat transferred and (c) the bore and stroke for 100 rpm and L/D =1.20. Ans (a)-40.23 kw, (b) -829kj/min / (c)21.71x25.76 cmarrow_forward7. If 10 kg/min of air are compressed isothermally from = 96 kPa and V, = 7.65 m/min to p, = 620 kPa, find the work, the change of entropy and the heat for (a) nonflow process and b) a steady flow process with v, = 15 m/s and v, = 60 m/s. Ans. (a)-1370KJ/min,-5.356 kJ/K.min; (b)-1386.9kJ, %3D minarrow_forwardA complex flow system expands helium from 1500 K, 1000 kPa to 500 K, 100 kPa. In the process this produces 4595 kJ/kg of work. The process exchanges heat with a reservoir at TR. If the process is reversible, find the unknown reservoir temperature (K). You can work this with either Thermofluids or the equations... Your choice. If equations, Cp=5.19 kJ/kg-K, Cv=3.12 kJ/kg-K, R=2.08 kJ/kg-K. Helium 1500 K 1000 kPa TR q 500 K 100 kPa W=4595 kJ/kgarrow_forward
- 2. If 0.17 kg/s of air are compressed isothermally from Pi = 96 kPaa and V, = 0.13 m/s to p2 = 620 kPaa, find the work, the change of entropy, and heat for: a) a nonflow process, and b) a steady flow process with V1 = 15 m/s and V2 = 60 %3D %3D m/s.arrow_forwardSteam at 320 °C and 80 bar enter Nozzle with velocity 70 m/s and leaving by temperature is 100 °C the process (adiabatic and reversible thorough nozzle). Calculate the exit velocity.arrow_forwardNitrogen at a flow rate of 0.1 kg / s enters a heat exchanger at a temperature of 450 K and 320 It comes out at K temperature. The other fluid of the heat exchanger is water, it enters at 20 ° C and leaves at 35 ° C. a) Calculate the flow of water. b) Calculate the entropy generation in this heat exchanger. (Take the average specific heating heat for nitrogen as 1.042 kJ / kgK.)arrow_forward
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