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
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Chapter 7 Solutions
Thermodynamics: An Engineering Approach
- Steam enters a steady-flow turbine with a mass flow rate of 20 kg/s at 600 C (Celsius), 5 MPa, and a negligible velocity. The steam expands in the turbine to a saturated vapor at 500 kPa where 10 percent of the steam is removed for some other use. The remainder of the steam is reheated to 600 C (Celsius in the reheater and then expands to the turbine exit where the pressure is 10 kPa and specific volume is 12.47 m3/kg. If the turbine is adiabatic, determine the ratio of the rate of heat added in the reheater to the rate of work done by the steam during this process. Select one: a. 0.99 b. 0.1 c. 1.5 d. 0.38arrow_forwardSteam enters a steady-flow turbine with a mass flow rate of 20 kg/s at 600 C (Celsius), 5 MPa, and a negligible velocity. The steam expands in the turbine to a saturated vapor at 500 kPa where 10 percent of the steam is removed for some other use. The remainder of the steam is reheated to 600 C (Celsius in the reheater and then expands to the turbine exit where the pressure is 10 kPa and specific volume is 12.47 m3/kg. If the turbine is adiabatic, determine the ratio of the rate of heat added in the reheater to the rate of work done by the steam during this process.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 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_forward
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