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
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