FUNDAMENTALS OF THERMODYNAMICS
10th Edition
ISBN: 9781119634928
Author: Borgnakke
Publisher: WILEY
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· 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
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A steam is expanded through a nozzle and the enthalphy drop per kg of steam from the initial pressure to the final pressure is 70 kJ. Neglecting the friction, find the velocity of discharge.
Helium is compressed through a compressor steadily. At the inlet the pressure is and the temperature is . At the exit the pressure is and the temperature is . The power input is and the heat loss rate is during this process. Neglect the kinetic and potential energy changes. Assume helium is ideal gas with a constant specific heat and its specific heat ratio , which means that enthalpy can be calculated using . Calculate the work per unit mass _________
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- 35 220 B/s ll Water at 10 MPa aand 200°C expands through a throttle valve to a final pressure of 0.5 MPa, the enthalpy does not change because the process is assumed to be adiabatic and no shaft work is done. What is the final state of water?arrow_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_forwardTwo rigid tanks are filled with water. Tank A is 0.2 m³ at 100 kPa, 150°C and tank B is 0.3 m³ at saturated vapor 300 kPa. The tanks are connected by a pipe with a closed valve. We open the valve and let all the water come to a single uniform state while we transfer enough heat to have a final pressure of 300 kPa. Give the two property values that determine the final state and find the heat transfer. B Aarrow_forward
- Number 3arrow_forwardHow much entropy is transferred if 200 W of thermal energy are transferred to a heat sink at 300K?arrow_forwardA reciprocating compressor compresses air 1/8 th times of its initial volume. If the pressure of air beforecompression is 5 bar and volume of air after compression is .016m 3 , when the law followed is pv 1.6 =constant. Calculate the work done and draw the process on PV diagram.arrow_forward
- 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_forward4. Air at a temperature of 500 0C is compressed at a constant pressure of 1.2MPa from a volume of 2 m3 to a volume of 0.4m3 . If the initial internal energy decrease is 4820 KJ, find a. The work done during the reversible compression b. The heat transferred c. The change of enthalpy d. The average specific heat at constant pressurearrow_forwardSteam 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_forward
- Helium is compressed through a compressor steadily. At the inlet the pressure is and the temperature is . At the exit the pressure is and the temperature is . The power input is and the heat loss rate is during this process. Neglect the kinetic and potential energy changes. Assume helium is ideal gas with a constant specific heat and its specific heat ratio , which means that enthalpy can be calculated using . Select the simplified the energy balance equation for this process_________ A. B. C. D.arrow_forward8: A small metallic object of 5 kg mass and at a temperature of is thrown in a tank of water at temperature. Calculate change in entropy of the universe.arrow_forwardFind the quality and internal energy of steam at 700 kPa and enthalpy of 2600 kJ/kg.arrow_forward
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