Question 1 a) A sample of water at a pressure of 10 bar has a temperature...
Question 1
a) A sample of water at a pressure of 10 bar has a temperature of 189.9 oC. What state is the water in?
b) Superheated water vapour is held in a vessel at 0.5MPa. If the temperature of the vapour is 345 oC, then determine the specific enthalpy of the vapour.
c) A liquid/vapour mixture of refrigerant 22(R-22) is stored at 10 bar and has a specific enthalpy of 220kJ/kg. Determine the quality of the mixture.
Homework Answers
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Question 1
a) A sample of water at a pressure of 10 bar has a
temperature...
What is the specific enthalpy of WATER at a pressure of 1 bar and a temperature...
What is the specific enthalpy of WATER at a pressure of 1 bar and a temperature of 25 oC? Express your numerical answer in kJ/kg with 2 decimal places
Water is the working fluid in a modified Rankine cycle with superheat and reheat. Water as...
Water is the working fluid in a modified Rankine cycle with superheat and reheat. Water as superheated vapor enters the high-pressure stage turbine at 60 bar and 440 C and leaves at 5 bar as liquid-vapor mixture with a quality of xa-0.98. It is then reheated to 400 °C at the same pressure of 5 bar before entering the second stage turbine where it expands to a pressure of 0.1 bar and a mixture quality of x0.96. The condenser pressure...
- Question 3 Superheated steam at a pressure and temperature of 60 bar and 450 degC...
- Question 3 Superheated steam at a pressure and temperature of 60 bar and 450 degC undergoes adiabatic expansion through a turbine at a steady rate of 16.3 kg/s. The steam exits the turbine in a wet condition with a pressure of 0.34 bar and specific enthalpy of 2,355 kJ/kg. 25 points Determine the How Did I Do? How Did I Do? properties of the superheated steam at the turbine entrance (state 1): Specific volume, V: 0.0521 m^3/kg kJ/kg Specifio...
1)1000 W of power is supplied to an electric motor, which has an efficiency of 95%. The motor's s...
1)1000 W of power is supplied to an electric motor, which has an efficiency of 95%. The motor's shaft drives a water pump, which is 70% efficient. The system is steady. Determine the rate at which the mechanical energy of the fluid increases between the inlet and outlet of the pump, and where the difference in energy went. 2)The quality of a saturated liquid-vapour mixture is 100% when the fluid is comprised entirely of Select one: a. Compressed liquid b....
Problem 5- A piston-cylinder device initially contains steam at 3.5 MPa, superheated by .10°C. Now, steam loses hea...
Problem 5- A piston-cylinder device initially contains steam at 3.5 MPa, superheated by .10°C. Now, steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at .200C. Determine the initial temperature of the steam a. b. Sketch the process on a P-v an T-v diagram Determine the initial specific enthalpy, in kJ/kg d. Determine the enthalpy change...
Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa,...
Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa, 40°C at 60 kg/s. Another stream of water in saturated mixture enters the heater at inlet 2 at temperature of 175 °C. The heater operates at steady state and heat transfer to surrounding can be neglected. At exit 3, saturated liquid flows out at 275 kPa. Select two (2) different values of mixture quality at inlet 2 between 0.5 and 0.8, and subsequently plot...
3. (10 points) Assume that a container of liquid purified water at P=1 bar can be...
3. (10 points) Assume that a container of liquid purified water at P=1 bar can be superheated to reach T=376 K without boiling. A nucleation event then takes place and the water quickly reaches equilibrium. Calculate the percentage volume increase upon the nucleation, i.e. how does the volume of the remaining liquid and produced vapor compare to the volume of the liquid prior to the nucleation. Use the heat capacity at constant pressure value Cp=4.215J/(g K). The enthalpy change on...
3. D. Since the pressure of the system finally increases beyond the initial saturation pressure, ...
3. D. Since the pressure of the system finally increases beyond
the initial saturation pressure,
the tank is rigid and the mass of the refrigerant does not change,
what does this imply for the
refrigerant?
A) Finally, the refrigerant is in the saturated vapor
state.
B) Finally, the refrigerant is in the compressed liquid
state.
C) Finally, the refrigerant is in the superheated vapor
state.
D) Finally, the refrigerant maintains the same specific volume but
at a higher pressure.
3....
3.12 w A tank contains a two-phase liquid-vapor mixture of Refrigerant 22 at 10 bar. The...
3.12 w A tank contains a two-phase liquid-vapor mixture of Refrigerant 22 at 10 bar. The mass of saturated liquid in the tank is 25 kg and the quality is 60%. Determine the volume of the tank, in mº, and the fraction of the total volume occupied by saturated vapor.
-Rome can get pretty hot in the mid-summer! Most of the air conditioning units in the Tiber campus use the working flui...
-Rome can get pretty hot in the mid-summer! Most of the air conditioning units in the Tiber campus use the working fluid R-134a (1,1,1,2-tetrafluoroethane), which is replaces the less environmentally-friendly R-12 of years ago. a) Illustrate the following air conditioning cycle, indicating material, heat, and work flows, as well as given/known temperatures and pressures: R-134a is pressurized to 10.2 bar in an adiabatic, reversible compressor. This high-pressure, hot refrigerant is condensed outside of the building using ambient air to a...
Water is the working fluid in a modified Rankine cycle with superheat and reheat. Water as superheated vapor enters the high-pressure stage turbine at 60 bar and 440 C and leaves at 5 bar as liquid-vapor mixture with a quality of xa-0.98. It is then reheated to 400 °C at the same pressure of 5 bar before entering the second stage turbine where it expands to a pressure of 0.1 bar and a mixture quality of x0.96. The condenser pressure...
- Question 3 Superheated steam at a pressure and temperature of 60 bar and 450 degC undergoes adiabatic expansion through a turbine at a steady rate of 16.3 kg/s. The steam exits the turbine in a wet condition with a pressure of 0.34 bar and specific enthalpy of 2,355 kJ/kg. 25 points Determine the How Did I Do? How Did I Do? properties of the superheated steam at the turbine entrance (state 1): Specific volume, V: 0.0521 m^3/kg kJ/kg Specifio...
Problem 5- A piston-cylinder device initially contains steam at 3.5 MPa, superheated by .10°C. Now, steam loses heat to the surroundings and the piston moves down, hitting a set of stops, at which point the cylinder contains saturated liquid water. The cooling continues until the cylinder contains water at .200C. Determine the initial temperature of the steam a. b. Sketch the process on a P-v an T-v diagram Determine the initial specific enthalpy, in kJ/kg d. Determine the enthalpy change...
Question 4 Liquid water enters a feedwater heater at inlet 1 with inlet conditions 15 MPa, 40°C at 60 kg/s. Another stream of water in saturated mixture enters the heater at inlet 2 at temperature of 175 °C. The heater operates at steady state and heat transfer to surrounding can be neglected. At exit 3, saturated liquid flows out at 275 kPa. Select two (2) different values of mixture quality at inlet 2 between 0.5 and 0.8, and subsequently plot...
3. (10 points) Assume that a container of liquid purified water at P=1 bar can be superheated to reach T=376 K without boiling. A nucleation event then takes place and the water quickly reaches equilibrium. Calculate the percentage volume increase upon the nucleation, i.e. how does the volume of the remaining liquid and produced vapor compare to the volume of the liquid prior to the nucleation. Use the heat capacity at constant pressure value Cp=4.215J/(g K). The enthalpy change on...
3. D. Since the pressure of the system finally increases beyond
the initial saturation pressure,
the tank is rigid and the mass of the refrigerant does not change,
what does this imply for the
refrigerant?
A) Finally, the refrigerant is in the saturated vapor
state.
B) Finally, the refrigerant is in the compressed liquid
state.
C) Finally, the refrigerant is in the superheated vapor
state.
D) Finally, the refrigerant maintains the same specific volume but
at a higher pressure.
3....
3.12 w A tank contains a two-phase liquid-vapor mixture of Refrigerant 22 at 10 bar. The mass of saturated liquid in the tank is 25 kg and the quality is 60%. Determine the volume of the tank, in mº, and the fraction of the total volume occupied by saturated vapor.
-Rome can get pretty hot in the mid-summer! Most of the air conditioning units in the Tiber campus use the working fluid R-134a (1,1,1,2-tetrafluoroethane), which is replaces the less environmentally-friendly R-12 of years ago. a) Illustrate the following air conditioning cycle, indicating material, heat, and work flows, as well as given/known temperatures and pressures: R-134a is pressurized to 10.2 bar in an adiabatic, reversible compressor. This high-pressure, hot refrigerant is condensed outside of the building using ambient air to a...
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