FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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A two stage compressor receives 0.35 kg/s of air at 100 kPa and 269 K and delivers it at 5000 kPa. For minimum work and perfect intercooling find the amount of cooling water in the intercooler for 8oC water change of temperature.
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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.
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))
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- Steam engine with incomplete expansion receives saturated steam at 1.04 Mpa,expands it to 0.105 Mpa where release occurs. Exhaust is to a condenser at 40C.The actual engine uses 6070 kg/h of steam; it has a brake engine efficiency of 60%and a mechanical efficiency of 85%. The electric generator which it drives has anefficiency of 925. (a) For the ideal engine, find the thermal efficiency and the mep.For the actual engine, determine (b) the brake work in kW and the brake thermalefficiency, (c) the indicated work in kW, indicated thermal efficiency and indicatedsteam rate, (d) the combined thermal efficiency and the combined steam ratearrow_forward3. 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_forwardA steam turbine has an inlet of 3 kg/s water at 1200 kPa and 350°C with a velocity of 15 m/s. The exit is at 100 kPa, 150°C and very low velocity. Find the specific work and the power produced.arrow_forward
- Water Vapor pressure 8 MPa and 350 in an adiabatic turbineIt enters at a temperature of oC and at a pressure of 750 kPacomes out. Reversible The amount of work done by the unit mass of steam for the processcalculate.arrow_forwardThe pressure and temperature entering the turbine is 1800kpaa and 380oC. The temperature leaving the turbine is 20kpa. The quality of steams entering the condenser is 90%. Find the turbine work in kJ/kg.arrow_forwardSteam at 4MPa and 400°C is expanded to 120 kpa in an adiabatic turbine. Find the isentropic efficiency if the steam is exhausted a a saturated vapor.arrow_forward
- Ideal air enters a compressor at 100 kPa and is compressed to 150 kPa. The isentropic efficiency is 70%. For a mass flow rate of 10 (kg/s), find the exit temperature.arrow_forwardIf air enters the adiabatic turbine at 227 degree C and 1500kpa. Final pressure would reach 100kpa, and efficiency of turbine at 85%. What is final temperature and final work? Cv is 0.719kJ/kg.K, cp is 1.007kj/kg.k. Pls sketch two processes of T-S diagramarrow_forwardI do not understand the chapter in general. May you please explain why you completed each step as you have. Thank you.arrow_forward
- A-A nozzle should produce a flow of air with 200 m/s at 20°C, 100 kPa (exit condition). It is estimated that the nozzle has an isentropic efficiency of 92%. Calculate the inlet air conditions, assuming that the inlet kinetic energy is negligible. B- 1kg of air at 10bar and 125°C receives heat at constant pressure until its temperature become 650°C, its then expands adiabatically to pressure of 1bar. Determine the change of entropy during each process and the final air temperature.arrow_forward18. Saturated water at 200 psia is heated at constant pressure in a reversible non-flow process until it becomes saturated vapor. Find its change in entropy in BTU/lb-Rarrow_forwardThe steam rate to a turbine for variable output is controlled by a throttle valve in the inlet line.Steam is supplied to the throttle valve at 1,700 kPa and 225°C. During a test run, the pressure atthe turbine inlet is 1000 kPa, the exhaust steam at 10 kPa has a quality of 0.95, the steam flowrate is 0.5 kg/s, and the power output of the turbine is 180kW. 1. What are the heat losses from the turbine? 2. What would be the power output if the steam supplied to the throttle valve were expandedisentropically to the final pressure?arrow_forward
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