FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Q6) One kg of air is allowed to expand reversibly in a cylinder behind a piston in
an isothermal process at 260°C, while the volume is doubled. The piston is then
moved and heat rejected at constant pressure until the volume is the same as it was
initially. Find the heat flow and the overall change of entropy.
A 2.5 kg copper block at 200 °C and 5 kg aluminum block at 20 °C come in thermal contact. Find the final
temperature and the entropy generated. Consider both blocks together as your system and assume no
heat loss to the surroundings.
Entropy and ideal steady devices
1. H2O flows through a reversible adiabatic turbine. The inlet condition
is 1000 F and 400 psia. The outlet condition is 10 psia. The turbine
produces 100 hp. Neglecting kinetic and potential energy
a. Draw the process curve on a T-s diagram. Show the saturation
dome and label the inlet and exit states
b. Find the enthalpy and entropy at the inlet
c. Find the enthalpy at the exit
d. Compute the mass flow rate
e. Compute the rate of entropy generation
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- 5. A cylinder piston contains 100/ air at 110 kPa. The air is then compressed in a reversible polytropic process to a final state of 800 kPa & 0.0218m³; assume that the heat transfer is40.28 kj/kg to the ambient. Determine the polytropic index, the initial and final temperature of the air, the mass of the air and the total entropy generation assuming the initial temperature as a surrounding temperature.arrow_forward2.Ammonia gas(k=1.32) flows isentropically from100kPa and 130C to 400kPa with required input compressor work of 360 kW. Find the mass flow rate of ammonia gas.arrow_forwardA car or engine takes 2000 J of heat from a reservoir at 500 K, does some work, and discards some heat to a reservoir at 350 K. Find the total entropy change in the engine during one cyclearrow_forward
- Air at the rate of 14kg/sec expands from 3bar, 1500C, 0.1m3 to 1 bar reversibly and adiabatically. Find the exit temperature and power developed. If the heat is given to the system 1200J. Find out the change in internal energyarrow_forwardA pressure cooker 6 ltrarrow_forwardA turbine operating in a continuous flow works adiabatically. The water vapor enters the turbine at a temperature of 650 C and comes out with 20 kPa pressure and 85% dryness. Find the mass flow rate (kg / sec) required to generate 10 MW of power from the system (ignore KE and PE changes)arrow_forward
- You have an adiabatic steam turbine. The steam enters a 0.1m diameter pipe at 200 m/s and it at state conditions of 773K and specific volume of 0.0482 m?/kg. When it exits the turbine as a saturated mixture at 393K its specific volume is 0.665 m²/kg. Using the first law for control volumes, find the work output of the turbine. You can neglect the change in KE and PE.arrow_forwardInside the cylinder piston system shown in the figure, there is 0.2 kg of air at 400 kPa pressure and 30 ° C temperature. The piston is attached with a pin. The system comes to balance after the pin is pulled. The cylinder piston system is completely adiabatic. The ambient pressure is 120 kPa and the temperature is 20 ° C. Find the net entropy change, the work done during the process. Keep specific temperatures constant.arrow_forward12. Calculate the entropy of steam in kJ/kg-K at 476 kPa with quality of 0.6.arrow_forward
- Number 4arrow_forwardHot water at 400kPa, 150 deg Celsius is fed to a throttle at a rate of 1.5kg/s and exits at 200kPa. After leaving the throttle, the resulting mixture enters a chamber where the vapor leaves from the top at 200kPa and the liquid leaves from the bottom at 200kPa. What is the mass flow rate of each of the two exit flows?arrow_forwardProblem (4.3): 1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a way that the temperature remains constant at 260°C while the yolume is doubled The piston is then moved in and heat is rejected by the air reversibly at constant pressure until the volume is the same as it was initially. Calculate the net heat flow and the overall change of entropy. Sketch the processes on a (T-S) diagram.arrow_forward
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