(a)
Interpretation:
Considering vapor-compression refrigeration cycle and different
Concept introduction:
Below shown diagram represents vapor-compression refrigeration cycle on a
The line
The equations used to calculate the heat absorbed in evaporator and the heat rejected in condenser are:
The work of compression is:
The coefficient of performance is:
The rate of circulation of refrigerant,
For Carnot refrigeration cycle, highest possible value of
(a)
Answer to Problem 9.9P
Explanation of Solution
Given information:
The refrigerant is tetrafluoroethene.
Evaporation
Condensation
Refrigeration rate is
The given data for the vapor-compression cycle are:
From table 9.1, the values of
For isentropic compression,
The saturation pressure at point 4 is the pressure at which the vapor condenses which is
At point
Calculate the value of
Now, calculate
Also,
Use equation (5) to calculate the value of
Use equation (2) to calculate the value of
Since,
The work done is calculated as:
Use equation (5) to calculate the coefficient of performance for vapor-compression cycle as:
For Carnot cycle, the coefficient of performance is calculated as:
(b)
Interpretation:
Considering vapor-compression refrigeration cycle and different thermodynamic processes taking place between two stages, the circulation rate of refrigerant, the heat transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle and the coefficient of performance of a Carnot refrigeration cycle are to be calculated.
Concept introduction:
Below shown diagram represents vapor-compression refrigeration cycle on a
The line
The equations used to calculate the heat absorbed in evaporator and the heat rejected in condenser are:
The work of compression is:
The coefficient of performance is:
The rate of circulation of refrigerant,
For Carnot refrigeration cycle, highest possible value of
(b)
Answer to Problem 9.9P
Explanation of Solution
Given information:
The refrigerant is tetrafluoroethene.
Evaporation
Condensation
Refrigeration rate is
The given data for the vapor-compression cycle are:
From table 9.1, the values of
For isentropic compression,
The saturation pressure at point 4 is the pressure at which the vapor condenses which is
At point
Calculate the value of
Now, calculate
Also,
Use equation (5) to calculate the value of
Use equation (2) to calculate the value of
Since,
The work done is calculated as:
Use equation (5) to calculate the coefficient of performance for vapor-compression cycle as:
For Carnot cycle, the coefficient of performance is calculated as:
(c)
Interpretation:
Considering vapor-compression refrigeration cycle and different thermodynamic processes taking place between two stages, the circulation rate of refrigerant, the heat transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle and the coefficient of performance of a Carnot refrigeration cycle are to be calculated.
Concept introduction:
Below shown diagram represents vapor-compression refrigeration cycle on a
The line
The equations used to calculate the heat absorbed in evaporator and the heat rejected in condenser are:
The work of compression is:
The coefficient of performance is:
The rate of circulation of refrigerant,
For Carnot refrigeration cycle, highest possible value of
(c)
Answer to Problem 9.9P
Explanation of Solution
Given information:
The refrigerant is tetrafluoroethene.
Evaporation
Condensation
Refrigeration rate is
The given data for the vapor-compression cycle are:
From table 9.1, the values of
For isentropic compression,
The saturation pressure at point 4 is the pressure at which the vapor condenses which is
At point
Calculate the value of
Now, calculate
Also,
Use equation (5) to calculate the value of
Use equation (2) to calculate the value of
Since,
The work done is calculated as:
Use equation (5) to calculate the coefficient of performance for vapor-compression cycle as:
For Carnot cycle, the coefficient of performance is calculated as:
(d)
Interpretation:
Considering vapor-compression refrigeration cycle and different thermodynamic processes taking place between two stages, the circulation rate of refrigerant, the heat transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle and the coefficient of performance of a Carnot refrigeration cycle are to be calculated.
Concept introduction:
Below shown diagram represents vapor-compression refrigeration cycle on a
The line
The equations used to calculate the heat absorbed in evaporator and the heat rejected in condenser are:
The work of compression is:
The coefficient of performance is:
The rate of circulation of refrigerant,
For Carnot refrigeration cycle, highest possible value of
(d)
Answer to Problem 9.9P
Explanation of Solution
Given information:
The refrigerant is tetrafluoroethene.
Evaporation
Condensation
Refrigeration rate is
The given data for the vapor-compression cycle are:
From table 9.1, the values of
For isentropic compression,
The saturation pressure at point 4 is the pressure at which the vapor condenses which is
At point
Calculate the value of
Now, calculate
Also,
Use equation (5) to calculate the value of
Use equation (2) to calculate the value of
Since,
The work done is calculated as:
Use equation (5) to calculate the coefficient of performance for vapor-compression cycle as:
For Carnot cycle, the coefficient of performance is calculated as:
(e)
Interpretation:
Considering vapor-compression refrigeration cycle and different thermodynamic processes taking place between two stages, the circulation rate of refrigerant, the heat transfer rate in the condenser, the power requirement, the coefficient of performance of the cycle and the coefficient of performance of a Carnot refrigeration cycle are to be calculated.
Concept introduction:
Below shown diagram represents vapor-compression refrigeration cycle on a
The line
The equations used to calculate the heat absorbed in evaporator and the heat rejected in condenser are:
The work of compression is:
The coefficient of performance is:
The rate of circulation of refrigerant,
For Carnot refrigeration cycle, highest possible value of
(e)
Answer to Problem 9.9P
Explanation of Solution
Given information:
The refrigerant is tetrafluoroethene.
Evaporation
Condensation
Refrigeration rate is
The given data for the vapor-compression cycle are:
From table 9.1, the values of
For isentropic compression,
The saturation pressure at point 4 is the pressure at which the vapor condenses which is
At point
Calculate the value of
Now, calculate
Also,
Use equation (5) to calculate the value of
Use equation (2) to calculate the value of
Since,
The work done is calculated as:
Use equation (5) to calculate the coefficient of performance for vapor-compression cycle as:
For Carnot cycle, the coefficient of performance is calculated as:
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Chapter 9 Solutions
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