FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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Chapter 5, Problem 5.31P
A car engine
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Water vapor enters a turbine at 6 MPa pressure and 800 ° C temperature and leaves at 20 kPa pressure. Since the heat loss from the turbine with an izanopic efficiency of 95% is 49.7 kJ / kg,
a) Find the actual amount of work (kj / kg) produced by the turbine.
b) Find the reversible work (kJ / kg) between the inlet and outlet of the turbine. (Take the ambient temperature 20 ° C.)
· A 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 energy
A turbine receives 8 kg/s of air at 9 MPa, 677 C and 60 m/s (pressure, temperature and
velocity). It discharges the air at a temperature of 77 C and a velocity of 15 m/s. In addition,
there is heat transfer from the turbine to the surroundings for 150 kW. Find the power
produced by the turbine in kW and its isentropic efficiency. You may use specific heats at the
average temperature.
Chapter 5 Solutions
FUNDAMENTALS OF THERMODYNAMICS
Ch. 5 - Prob. 5.1PCh. 5 - A windowmounted air conditioner removes 3.5kJ from...Ch. 5 - R410A enters the evaporator (the cold beat...Ch. 5 - A large heat pump should upgrade 4MW of heat at...Ch. 5 - A car engine 5g/s fuel (equivalent to addition of...Ch. 5 - Prob. 5.37PCh. 5 - R134a fills a 0.1m3 capsule at 20°C, 200kPa. It is...Ch. 5 - Air in a piston/ cylinder goes through a Carnot...Ch. 5 - A heat engine receives 7kW from a 300°C source and...Ch. 5 - Consider the previous problem and assume the...
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- The power of a steam turbine in a thermal power plant is 60 MW. Water vapor enters the turbine at 3MPa pressure, 4000C temperature and 50 m / s speed, 10 kPa pressure, 0.9 dry degree and 200 m / s speed leaves the turbine. Considering the turbine as adiabatic; 1-Find the mass flow of steam 2-Find the turbine outlet cross-sectional area, its ratio (A2 / A1) to the inlet cross-sectional area.arrow_forwardNonearrow_forward1.A rotary compressor receives 6m3/min of gas (R=410 J/kg-K, k=1.67) at 105 kPaa, 26.85°C and delivers it at 630 kPaa; changes of potential and kinetic energies are negligible. Find the work in kJ/min if the process is a) isentropic, b) isothermal c)polytropic with n=1.4arrow_forward
- In a closed container with a constant volume, there is air at a temperature of 300 K and a pressure of 150 kPa. 800 kj mixing work is being done from the environment to the cab and the container gives 100 kj heat to the environment.Since the volume of the cab is 3 m³ and the boundary temperature between the cab and the environment is 350, a) determine the final temperature of the air. b) find the amount of entropy produced in the state change as kj/K. Note: specific temperatures are constant.arrow_forwardProvide the solution and diagram. A 120 tons refrigeration system with COP of 5 has a condenser which is to be cooled by means of a cooling tower. Air enters the tower at 25 oC db and 50% RH and leaves at 35 oC db and 80% RH. Find the volume of air needed m3/hr. At 25oC and 50% RH: h = 50 KJ/kg, v = 0.86 m3/kg At 350C db and 80% RH: h = 108 A. 7.51 m3/s B. 2.34 m3/s C. 4.98 m3/s D. 3.16 m3/sarrow_forwardNumber 3arrow_forward
- Steam 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_forwardSuppose 400 kW of power potential is wasted during the process as a result of irreversibility. Let say the heat pump received heat at a rate of 1000 kJ/s from a heat source. The reversible power of the present process is found to be 800 kW. Find unavailable heat, which is rejected to the sink.arrow_forwardAir flows steadily through an engine at a constant temperature, 400K. Find the work per kilogram if the exit pressure is one-third the inlet pressure and the inlet pressure is 207 kPa. Assume that the kinetic and potential energy variation is negligible.arrow_forward
- Steam enters a continuous flow turbine at a pressure of 8 MPa and a temperature of 450 ℃ and reaches a pressure of 70 kPa it is expanding. The mass flow rate of the steam is 200000 kg/hour and it is in the form of saturated steam at the outlet. By accepting the ambient temperature, 25℃ and pressure 100 kPa; a) The power potential of the steam at the inlet conditions b) Can you find the turbine power output for the situation where there are no irreversibilities? (Kinetic and potential energy ignore the changes).arrow_forwardSteam enters a turbine 80 lb of steam per minute with an enthalpy of 2171 BTU/lb and velocity of 125 fps. It leaves the turbine at 1520 BTU/lb at 589 fps. The heat loss is 90,000 BTU/hr. Find the horsepower output of the turbine.arrow_forward5arrow_forward
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