a)
The rate of heat removal from the chicken.
a)
Answer to Problem 146P
The rate of heat removal from the chicken is
Explanation of Solution
Write the expression for the energy balance equation for closed system.
Here, rate of net energy transfer in to the control volume is
Write the expression to calculate the mass flow of the chicken.
Here, average mass of the chicken is
Conclusion:
For the steady flow system, rate of change in internal energy of the system is zero.
Substitute 0 for
Here, mass flow rate is
From Equation (II) write the expression to calculate the rate of heat removal from the chicken.
Here, the mass flow rate of chicken is
pressure for chicken is
Refer TableA-3, “Properties of common liquids, solids, and foods”, select the specific heat at constant pressure
Substitute
Substitute
Thus, the rate of heat removal from the chicken is
b)
The rate of entropy generation during the process.
b)
Answer to Problem 146P
The rate of entropy generation during the process is
Explanation of Solution
Write the expression for the entropy balance in the heat exchanger.
Here, rate of net input entropy is
Write the expression to calculate the total rate of heat gained by the water.
Here, total rate of heat gained by the water is
Write the expression to calculate the total rate of heat gained by the water
Here, mass flow rate of water is
Conclusion:
Substitute
Here, Mass flow rate at stage 1 and 2 are chicken and stage 3 and 4 are water , entropy at stage 1 is
Substitute 6.49 kW for
Substitute
Substitute
Thus, the rate of entropy generation during the process is
Want to see more full solutions like this?
Chapter 7 Solutions
Thermodynamics: An Engineering Approach
- NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. An adiabatic air compressor compresses 10.4 L/s of air at 120 kPa and 20°C to 1000 kPa and 300°C. The constant pressure specific heat of air at the average temperature of 160°C = 433 K is cp= 1.018 kJ/kg.K. The gas constant of air is R = 0.287 kPa.m³/kg-K. 1 MPa 300°C Compressor 120 kPa 20°C Vus Determine the work required by the compressor. (You must provide an answer before moving on to the next part.) The work required by the compressor is -4.578 kJ/kg.arrow_forwardNOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. An adiabatic air compressor compresses 10.4 L/s of air at 120 kPa and 20°C to 1000 kPa and 300°C. The constant pressure specific heat of air at the average temperature of 160°C = 433 K is cp= 1.018 kJ/kg.K. The gas constant of air is R = 0.287 kPa.m³/kg.K. 1 MPa 300°C Compressor 120 kPa 20°C Vus Determine the power required to drive the air compressor in kW. The power required to drive the air compressor is o kW.arrow_forward1-Water vapor enters an adiabatic turbine at 6.5MPa pressure and 400 ° C temperature, with a mass flow of 2.43 kg / s, expanding up to 75 kPa pressure. The isentropic efficiency of the turbine is 84%. Calculate (a) the temperature of the steam at the turbine outlet and (b) the power of the turbine, neglecting the kinetic and potential energy change of the steam.arrow_forward
- Q: Five hundred kilograms per hour of steam drives a turbine. The steam enters the turbine at 44 atm and 450°C at a linear velocity of 60 m/s and leaves at a point 5 m below the turbine inlet at atmospheric pressure and a velocity of 360 m/s. The turbine delivers shaft work at a rate of 70 kW, and the heat loss from the turbine is estimated to be 10ʻ kcal/h. Calculate the specific enthalpy change associated with the process.arrow_forward3) Refrigerant-134a enters a diffuser steadily as saturated vapor at 800 kPa with a velocity of 120 m/s, and it leaves at 900 kPa and 40°C. The refrigerant is gaining heat at a rate of 2 kJ/s as it passes through the diffuser. If the exit area is 80 percent greater than the inlet area, determine (a) the exit velocity and (b) the mass flow rate of the refrigerant. (for R-134, vs00 kPa= 0.025621 m/kg; hs00 kPa-267.29 kj/kg) (for R-134, v900 kPa, 40°C= 0.023375 m'/kg; h9oo kPa, 40°C-274.17 kj/kg)arrow_forwardQuestion 6 Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 10 MPa, 450°C, and 80 m/s, and the exit conditions are 10 kPa, 92 percent quality, and 50 m/s. The mass flow rate of the steam is 12 kg/s. Determine (a) the change in kinetic energy (b) the power output, (c) the turbine inlet area. Answers: (a)-1.95 kJ/kg, (b) 10.2 MW, (c) 0.00447 m² P-10 MPa 7₁-450°C V₁ = 80 m/s STEAM m = 12 kg/s P₂ = 10 kPa 4,-0.92 V₂ = 50 m/s outarrow_forward
- In a single-flash geothermal power plant, geothermal water enters the flash chamber (a throttling valve) at 230°C as a saturated liquid at a rate of 50 kg/s. The steam resulting from the flashing process enters a turbine and leaves at 20 kPa with a moisture content of 5 percent. Determine the temperature of the steam after the flashing process and the power output from the turbine if the pressure of the steam at the exit of the flash chamber is (a) 1 MPa, (b) 500 kPa, (c) 100 kPa, (d) 50 kPa.arrow_forwardNOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Air enters a nozzle steadily at 50 psia, 140°F, and 150 ft/s and leaves at 14.7 psia and 900 ft/s. The heat loss from the nozzle is estimated to be 6.5 Btu/lbm of air flowing. The inlet area of the nozzle is 0.09 ft2. The enthalpy of air at the inlet is h₁ = 143.47 Btu/lbm. Determine the exit area of the nozzle. The exit area of the nozzle is 0ft².arrow_forwardThe approach and efficiency of cooling tower are 10 oC and 65 %, respectively. If the temperature of water leaving the tower is 27 oC, determine the temperature of water entering the tower.arrow_forward
- A refrigeration system is being designed to cool eggs (ρ = 67.4 lbm/ft3 and cp = 0.80 Btu/lbm·°F) with an average mass of 0.14 lbm from an initial temperature of 90°F to a final average temperature of 50°F by air at 34°F at a rate of 3000 eggs per hour. Determine the required volume flow rate of air, in ft3 /h, if the temperature rise of air is not to exceed 10°F.arrow_forward1. Steam at a pressure of 2MPA and temperature 300°C is passed at a constant rate into a desuperheater unit. The desuperheater is accomplished by continuously spraying water at 95 °C onto incoming superheated steam. The amount of water injected is so regulated that both the water and superheated steam finally change into dry steam at 2 MPa. If the resulting mixture of dry saturated steam leaves the desuperheater at 2MPA and the rate of I kg/s, find the mass of superheated steam used per hour and the mass of water to be injected per hour. Fond also the diameter of the pipe through which the superheated steam flows to the superheater if the speed of the steam through the pipe is not to exceed 25m/s..arrow_forwardA 0.3-m3 rigid tank initially contains refrigerant- 134a at 14°C. At this state, 55 percent of the mass is in the vapor phase, and the rest is in the liquid phase. The tank is connected by a valve to a supply line where refrigerant at 1.4 MPa and 100°C flows steadily. Now the valve is opened slightly, and the refrigerant is allowed to enter the tank. When the pressure in the tank reaches 1 MPa, the entire refrigerant in the tank exists in the vapor phase only. At this point the valve is closed. Determine (a) the final temperature in the tank, (b) the mass of refrigerant that has entered the tank, and (c) the heat transfer between the system and the surroundings.arrow_forward
- Elements Of ElectromagneticsMechanical EngineeringISBN:9780190698614Author:Sadiku, Matthew N. O.Publisher:Oxford University PressMechanics of Materials (10th Edition)Mechanical EngineeringISBN:9780134319650Author:Russell C. HibbelerPublisher:PEARSONThermodynamics: An Engineering ApproachMechanical EngineeringISBN:9781259822674Author:Yunus A. Cengel Dr., Michael A. BolesPublisher:McGraw-Hill Education
- Control Systems EngineeringMechanical EngineeringISBN:9781118170519Author:Norman S. NisePublisher:WILEYMechanics of Materials (MindTap Course List)Mechanical EngineeringISBN:9781337093347Author:Barry J. Goodno, James M. GerePublisher:Cengage LearningEngineering Mechanics: StaticsMechanical EngineeringISBN:9781118807330Author:James L. Meriam, L. G. Kraige, J. N. BoltonPublisher:WILEY