...EMERGENCY 20 POINTS TO THE ANS dude? Refrigerant-134a at 250 kPa and 20°C undergoes an isothermal reversible process in a closed system until its quality is 25 percent.
a)Determine the specific entropy of the refrigerant in the initial state.
b)Determine the specific internal energy of the refrigerant in the initial state.
c)Determine the specific entropy of the refrigerant in the final state.
d)Determine the specific internal energy of the refrigerant in the final state.
e)Determine the amount of heat transferred in kJ/kg.
f)Determine the amount of work required in this process in kJ/kg.
Carbon dioxide is expanded from 2000 kPa and 420°C to 210 kPa and 27°C. Consider carbon dioxide as an ideal gas and remember that its heat capacity is a function of temperature. What is the change in entropy in kJ/(kg K)?
A well-insulated, shell-and-tube heat exchanger is used to heat water (cP = 4.18 kJ/(kg °C)) in the tubes from 23 to 70°C at a rate of 4.6 kg/s. Heat is supplied by hot oil (cP = 2.30 kJ/(kg °C)) that enters the shell side at 170°C at a rate of 12 kg/s.
a)Determine the rate of heat transfer between the two compartments of the heat exchanger
b)Determine the exit temperature of the oil.
c)Determine the rate of entropy generation in the heat exchanger (Sgen).
An ordinary egg can be approximated as a 5.3-cm-diameter sphere. The egg is initially at a uniform temperature of 6°C and is dropped into boiling water at 98°C. The egg has a density of 1020 kg/m3 and cV= cP = 3.32 kJ/(kg K).
a)Determine the amount of heat that is transferred to the egg by the time the average temperature of the egg rises to 70°C.
b)Determine the change in entropy of the egg (note that the temperature of the egg is not constant during cooking)
c)Determine the change in entropy of the boiling water
d)Determine the amount of entropy generated (Sgen) during this process
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a)Determine the specific entropy of the refrigerant in the initial state.
b)Determine the specific internal energy of the refrigerant in the initial state.
c)Determine the specific entropy of the refrigerant in the final state.
d)Determine the specific internal energy of the refrigerant in the final state.
e)Determine the amount of heat transferred in kJ/kg.
f)Determine the amount of work required in this process in kJ/kg.
Carbon dioxide is expanded from 2000 kPa and 420°C to 210 kPa and 27°C. Consider carbon dioxide as an ideal gas and remember that its heat capacity is a function of temperature. What is the change in entropy in kJ/(kg K)?
A well-insulated, shell-and-tube heat exchanger is used to heat water (cP = 4.18 kJ/(kg °C)) in the tubes from 23 to 70°C at a rate of 4.6 kg/s. Heat is supplied by hot oil (cP = 2.30 kJ/(kg °C)) that enters the shell side at 170°C at a rate of 12 kg/s.
a)Determine the rate of heat transfer between the two compartments of the heat exchanger
b)Determine the exit temperature of the oil.
c)Determine the rate of entropy generation in the heat exchanger (Sgen).
An ordinary egg can be approximated as a 5.3-cm-diameter sphere. The egg is initially at a uniform temperature of 6°C and is dropped into boiling water at 98°C. The egg has a density of 1020 kg/m3 and cV= cP = 3.32 kJ/(kg K).
a)Determine the amount of heat that is transferred to the egg by the time the average temperature of the egg rises to 70°C.
b)Determine the change in entropy of the egg (note that the temperature of the egg is not constant during cooking)
c)Determine the change in entropy of the boiling water
d)Determine the amount of entropy generated (Sgen) during this process
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