Water at 2500 psia, 500 ° F is throttled to 500 psia. What is the temperature...
Water at 2500 psia, 500 ° F is throttled to 500 psia. What is the temperature after throttling? What is the quality after throttling? Find quality as a decimal with 3 significant figures.
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Water at 2500 psia, 500 ° F is throttled to 500 psia. What is
the temperature...
6.5 lbm/s of refrigerant 134a initially at 40 psia and 60 F is throttled adiabatically to...
6.5 lbm/s of refrigerant 134a initially at 40 psia and 60 F is throttled adiabatically to 20 psia ft a) What is the volumetric flow rate before throttling? b) What is the volumetric flow rate after throtting? (Assume that the change in kinetic energy is negligible.) c) What is the temperature after throttling?
3. Refrigerant-134a flows at a rate of 9 Ibm/s at 40 psia, and 100°F. The refrigerant is then thr...
3. Refrigerant-134a flows at a rate of 9 Ibm/s at 40 psia, and 100°F. The refrigerant is then throttled adiabatically to 10 psia (a) What is the volumetric flow rate before throttling in ft'/s? Ans: 12.596 ft'/s (b) What is the volumetric flow rate after throttling in ft'/s? Assume that the change in kinetic energy is negligible. Ans: 51.64 ft/s (c) What is the temperature after throttling in "F? Ans: 92.763°F
3. Refrigerant-134a flows at a rate of 9 Ibm/s...
Water at 50°F and 20 psia is heated in a chamber by mixing it with saturated...
Water at 50°F and 20 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. If both streams enter the mixing chamber at the same mass flow rate, determine the quality of the exiting stream to 3 significant digits (don't forget a leading o if needed). Mixing section
A throttling calorimeter shown below is used to determine the quality of a two-phase mixture of...
A throttling calorimeter shown below is used to determine the quality of a two-phase mixture of R-134a refrigerant that is flowing in a tube. The calorimeter operates by bleeding offa small fraction of the flow stream and throttling it to a lower pressure. The device is based upon the fact that over a wide range of temperatures and qualities, the two-phase refrigerant can be throttled to a superheated vapor state. In this case, it is possible to estimate the stream...
2. (60 points) Water that is flowing in a pipe at 25 psia and 200 °F...
2. (60 points) Water that is flowing in a pipe at 25 psia and 200 °F at a rate of 1900 lbm/hr (state 1), cools down to 20 psia and 110 °F (state 2). Then it is mixed with a stream of water at a rate of 1000 lbm/hr at 20 psia and 240 °F (state 3). The mixing process is constant pressure (P2=P;-P) and adiabatic. Find the heat transfer rate from the water (0) and final enthalpy and temperature...
Air initially at 120 psia and 500*F is expanded by an adiabatic turbine to 15 psia...
Air initially at 120 psia and 500*F is expanded by an adiabatic turbine to 15 psia and 200* F. Assuming air can be treated as an ideal gas and has variable specific heat. a) Determine the specific work output of the actual turbine (Btu/lbm). b) Determine the amount of specific entropy generation during the irreversible process (Btu/lbm R). c) Determine the isentropic efficiency of this turbine (%). d) Suppose the turbine now operates as an ideal compressor (reversible and adiabatic)...
A piston-cylinder contains 6.9 lbm of water initially at 300 psia and 500°F. The volume then...
A piston-cylinder contains 6.9 lbm of water initially at 300 psia and 500°F. The volume then doubles in a polytropic process to a final pressure of 200 psia. How much heat was added, in units of Btu. Use a negative sign if heat actually removed instead of added. Selected Answer: 753.48 Correct Answer: 1,293.8 - 1096
11: The state of liquid water is changed from 500 psia and 50°F to 3000 psia...
11: The state of liquid water is changed from 500 psia and 50°F to 3000 psia and 300°F. Determine the change in the internal energy and enthalpy of water on the basis of the (a) compressed liquid tables, (b) incompressible substance approximation and property tables, and (c) specific-heat model. 12: A 2-m3 rigid tank initially contains air whose density is 2.18 kg/m2. The tank is connected to a high- pressure supply line through a valve. The valve is opened, and...
2.41 A closed, rigid tank contains 10 lbn water at a pressure of 60 psia and...
2.41 A closed, rigid tank contains 10 lbn water at a pressure of 60 psia and a quality of 0.92. The water is heated until its pressure has increased to 120 psia. Calculate the following quantities: (a) the mass of liquid water in the tank at the initial state (b) the mass of the water vapor in the tank at the initial state (c) the initial temperature of the water in the tank (d) the volume of the tank (e)...
Water enters the pump of a real Rankine cycle at 10 psia and 100°F The pump increases the pressur...
Answer: Thermal efficiency = 22%
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Water enters the pump of a real Rankine cycle at 10 psia and 100°F The pump increases the pressure to 1076 psia and has an efficiency of 75%. Friction and heat loss in the pipes to the boiler reduce the pressure and temperature to 985 psia and 95°F at the entrance to the boiler. The boiler heats the water to 915°F while friction in the boiler reduces the pressure to 963 psia....
6.5 lbm/s of refrigerant 134a initially at 40 psia and 60 F is throttled adiabatically to 20 psia ft a) What is the volumetric flow rate before throttling? b) What is the volumetric flow rate after throtting? (Assume that the change in kinetic energy is negligible.) c) What is the temperature after throttling?
3. Refrigerant-134a flows at a rate of 9 Ibm/s at 40 psia, and 100°F. The refrigerant is then throttled adiabatically to 10 psia (a) What is the volumetric flow rate before throttling in ft'/s? Ans: 12.596 ft'/s (b) What is the volumetric flow rate after throttling in ft'/s? Assume that the change in kinetic energy is negligible. Ans: 51.64 ft/s (c) What is the temperature after throttling in "F? Ans: 92.763°F
3. Refrigerant-134a flows at a rate of 9 Ibm/s...
Water at 50°F and 20 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. If both streams enter the mixing chamber at the same mass flow rate, determine the quality of the exiting stream to 3 significant digits (don't forget a leading o if needed). Mixing section
A throttling calorimeter shown below is used to determine the quality of a two-phase mixture of R-134a refrigerant that is flowing in a tube. The calorimeter operates by bleeding offa small fraction of the flow stream and throttling it to a lower pressure. The device is based upon the fact that over a wide range of temperatures and qualities, the two-phase refrigerant can be throttled to a superheated vapor state. In this case, it is possible to estimate the stream...
2. (60 points) Water that is flowing in a pipe at 25 psia and 200 °F at a rate of 1900 lbm/hr (state 1), cools down to 20 psia and 110 °F (state 2). Then it is mixed with a stream of water at a rate of 1000 lbm/hr at 20 psia and 240 °F (state 3). The mixing process is constant pressure (P2=P;-P) and adiabatic. Find the heat transfer rate from the water (0) and final enthalpy and temperature...
A piston-cylinder contains 6.9 lbm of water initially at 300 psia and 500°F. The volume then doubles in a polytropic process to a final pressure of 200 psia. How much heat was added, in units of Btu. Use a negative sign if heat actually removed instead of added. Selected Answer: 753.48 Correct Answer: 1,293.8 - 1096
11: The state of liquid water is changed from 500 psia and 50°F to 3000 psia and 300°F. Determine the change in the internal energy and enthalpy of water on the basis of the (a) compressed liquid tables, (b) incompressible substance approximation and property tables, and (c) specific-heat model. 12: A 2-m3 rigid tank initially contains air whose density is 2.18 kg/m2. The tank is connected to a high- pressure supply line through a valve. The valve is opened, and...
2.41 A closed, rigid tank contains 10 lbn water at a pressure of 60 psia and a quality of 0.92. The water is heated until its pressure has increased to 120 psia. Calculate the following quantities: (a) the mass of liquid water in the tank at the initial state (b) the mass of the water vapor in the tank at the initial state (c) the initial temperature of the water in the tank (d) the volume of the tank (e)...
Answer: Thermal efficiency = 22%
Show all labels/work.
Water enters the pump of a real Rankine cycle at 10 psia and 100°F The pump increases the pressure to 1076 psia and has an efficiency of 75%. Friction and heat loss in the pipes to the boiler reduce the pressure and temperature to 985 psia and 95°F at the entrance to the boiler. The boiler heats the water to 915°F while friction in the boiler reduces the pressure to 963 psia....
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