Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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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?
A compressor in a plant receives air at 100 kPa, 280 K, with low velocity. At compressor discharge, air exits at 1100 kPa, 500 K with velocity 25 m/s and then flows into a constant pressure heat exchanger where it is cooled down to 350 K. The power required the compressor is 50 kW. Determine the heat transfer rate in the heat exchanger.
A pump brings in 11.3 kg/s of liquid water feed at 1.66 bar and 50oC . The exit pressure from this pump is 2.61 bar. The pump (being real, not reversible) has an isentropic efficiency of 79%. What is the actual work input (in kW) required to run this pump?
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- 3. Steam enters the turbine at the rate of 1.5 kg/s with enthalpy of 2300 kJ/kg and exhaust enthalpy of 1200 kJ/kg. Steam is extracted from the turbine at a rate of 0.87 kg/s for heating purposes with enthalpy of 2570 kJ/kg. What is the turbine work, in HP?arrow_forwardThe enthalpy entering the turbine of a geothermal power plant is 2750 KJ/kg and ,ass rate of 1 Kg/sec. The turbine brake power is 1000 KW condenser outlet has enthalpy of 210 KJ/kg. If temperature rise of cooling water in condenser is 8, what is the mass of cooling water requirement?arrow_forwardThe 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.arrow_forward
- find the specific enthalphy at each point of the cycle, the amount of heat added, heat rejected, turbine work, pump work, net work and thermal efficiency in a carnot cycle between pressure limits of 3MPa and 10KPaarrow_forwardThe compressor used in a refrigeration cycle takes in saturated R-134a vapor at a pressure of 360 kPa and raises it to a pressure of 1.0 MPa. The compressor can be considered well-insulated and inlet and exit velocities are small. In steady-state operation, the mass flow is 0.048 kg/sec and the power requirement is 1450 Watts. Find the discharge temperature.arrow_forwardWhile the pressure remains constant at 689.5 Kpa the volume of the system of air changes from 0.567 m3 to 0.283 m3. What are (a) ∆U, (b) ∆H, (c) Q, (d) ∆S? (e) If the process is non-flow and internally reversible, what is the work?.arrow_forward
- Steam is admitted to a turbine at 600 psia and 740 F ,and exhausts to a condenser at a pressure of 1 psia . Assuming the process to be isentropic , find the drop in enthalpy , Btu/lb .arrow_forwardWhile 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_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
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