Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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Chapter 7, Problem 7.21P
A compressor in a commercial refrigerator receives R−410A at −25°C and unknown quality. The exit is at 2000 kPa, 60°C and the process is assumed to be reversible and adiabatic. Neglect kinetic energies and findthe inlet quality and the specific work.
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During the execution of a reversible nonflow process, the work is 216 kJ. If the initial pressure and volume 600 kPa and 0.1 m3respectively and the pressure varies as p = -300V + 630 kPa where V in m3, find the final volume and final pressure
A compressor In a refrigerator recelves R-410A at 150kPa, -40°C, and It brings the vapor up to 600 kPa using an actual specific work of 60 kJ/kg In an adlabatic compression. Surrounding temperature Is 25°C. Find the specific reversible work and the Irreversibility.
The power required for the compressor, to handle air adiabatically from 101.325kPaa and 300 °K to 305 kPaa, 2550 Hp. The inlet velocity is 21 m/s and the dischargevelocity of air is 85 m/s. a) If the process is isentropic, find the volume of air handles,in lps, measured at inlet conditions. b) If the compression is irreversible adiabatic totemperature 157.5 °C, with the capacity obtained in a), find the power input.
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- steam at 3.5 MPa with a quality of 89%, enters an adiabatic diffuser with velocity of 30.5 m/s and leaves at a lo of 4 m/s and 0.2 MPa. Find all the possible exit properties of this steam. Assume: Adiabatic, steady-flow system and neglect the potential energies and work.arrow_forwardA closed gaseous system undergoes a reversible process with constant pressure of 200kpa. 2500 kJ of heat is rejected, and the volume changes from 5m3 to 2m3. Find the change in internal energyarrow_forwardSteam entering a turbine at 600 psia and 750 °F and exhausts to a condenser at a pressure of 2.5 psia. Assuming the process to be isentropic, find the following: (a) quality after expansion, (b) drop in enthalpy, and (c) drop in internal energy.arrow_forward
- Water vapor enters an adiabatic turbine at a pressure of 8 MPa, a temperature of 600 ℃ and a speed of 100 m/s, and then a pressure of 50 kPa exits at a temperature of 150 ℃ and a speed of 160 m/s. The turbine power is 10 MW. According to this; a) The steam flow rate from the turbine b) Do you find the isanthropic efficiency of the turbine?arrow_forwardA centrifugal compressor pumps 45.3 kg/min of air at 101.32kPa and 15.6°C to 345 kPa and 132°C by an irreversible process. The temperature rise of 22.1 kg/ min of circulating water about the casing is 6.7°C. What is the horse power required? Neglect kinetic energy changes and no heat loss to surroundings.arrow_forwardA heat engine receives 5 kW at 800 K and 15 kW at 1000 K rejecting energy by heat transfer at 600 K. Assume it is reversible and find the power output, W.?arrow_forward
- During the execution of a reversible non-flow process the work is -156.2 KJ if V1=0.845 and the pressure varies as P=-730 V +690 KPa, where volume V is in m3 . Find the final volume.arrow_forwardAt 3MPa and 400C, 2 kg/s steam flows into a turbine. It exits at 300kPa. The turbine has an efficiency of 85%. For both turbine output and exit temperature, determine the actual and ideal values. the problem is not isentropicarrow_forwardSteam enters a turbine at 10 MPa and 600°C and exits at 0.1 bar. If the isentropic turbine efficiency is 90%, find the following:a. Specific actual and isentropic turbine workb. Actual and isentropic turbine exit temperaturearrow_forward
- While the pressure remains constant at 698.5 kPa the volume of the system of air changes from 0.57 cu meter to 0.28 cu meter. What are (a) ∆U , (b) ∆H, (c) ∆Q, (d) ∆S? (e) If the process is nonflow and internally reversible, what is the work?arrow_forwardProfessor Modyn feeds superheated steam at 1.00 MPa1.00 MPa and 350 ∘C350 ∘C into an adiabatic reversible turbine. The water exits at 800.0 kPa.800.0 kPa. Neglect changes in kinetic and potential energy. What is the exit temperature? Calculate the work for the turbine.arrow_forwardIf 22lbm/min of air are compressed isothermally from p1 = 14psia and v1= 270ft^3/min to p2 = 90psia. (a) find the change of entropy (b) heat transfer and (c) the work for non-flow and (d) steady flow process with v1= 12ft/sec and v2 = 150ft/secarrow_forward
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