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3. Refrigerant-134a flows at a rate of 9 Ibm/s at 40 psia, and 100°F. The refrigerant is then thr...
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?
Question 1 Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80°F with a...
Question 1 Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80°F with a velocity of 1400 ft/s. The inlet area is 1.4 in2. At the exit, the pressure is 400 lb/in and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in Ib/s, and the exit temperature, in °F
A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as s...
A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as saturated vapor at -15°(State 1). It then goes through a reversible adiabatic compressor to reach State 2. After flowing through the condenser (a heat exchanger), the refrigerant exits as saturated liquid at 70°C (State 3). It is then throttled by going through an expansion valve, to reach State 4. It finishes the cycle by going through another heat exchanger (the evaporator), to return to State 1....
Refrigerant 134a enters a compressor with a mass flow rate of 15 kg/s with a velocity...
Refrigerant 134a enters a compressor with a mass flow rate of 15 kg/s with a velocity of 10 m/s. The refrigerant enters the compressor as a saturated vapor at 10°C and leaves the compressor at 1400 kPa with an enthalpy of 281.39 kJ/kg with a negligible velocity. The rate of work done on the refrigerant is measured to be 380 kW. If the elevation change between the compressor inlet and exit is negligible, determine the rate of heat transfer associated...
Refrigerant 134a enters a turbine with a mass flow rate of 12 kg/s at 54°C, 3...
Refrigerant 134a enters a turbine with a mass flow rate of 12 kg/s at 54°C, 3 MPa, while the velocity is negligible. The refrigerant expands in the turbine to a saturated vapor at 400 kPa where 10 percent of the steam is removed for some other use. The remainder of the refrigerant continues to expand to the turbine exit where the pressure is 5 kPa and quality is 75 percent. If the turbine is adiabatic, determine the rate of work...
Problem 2 Let's consider a single-stream problem with a 28-cm diameter pipe where Refrigerant R-134a flows...
Problem 2 Let's consider a single-stream problem with a 28-cm diameter pipe where Refrigerant R-134a flows steadily at 200 kPa and 20°C with a velocity of 5 m/s. The refrigerant undergoes a heating process, and leaves at 180 kPa and 40 degrees C 0 R-134a 200 kPa 20°C 5 m/s 180 kPa 40°C 10.2. A. Is this a steady-flow process? Check all that apply. □ Yes, nothing else is mentioned and we need to make this assumption to proceed with...
3. An air-conditioning system is shown in Fig.3, in which air flows over tubes carrying Refrigerant...
3. An air-conditioning system is shown in Fig.3, in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of 50 m3/min at 32°C, 1 bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy effects, determine at steady state (a) the mass...
10. (25 Points) Steam enters an insulated nozzle at 140 psia, 600 F with a velocity...
10. (25 Points) Steam enters an insulated nozzle at 140 psia, 600 F with a velocity of 100 ft/s. It leaves the nozzle at 20 psia, 360°F. The mass flow rate is 10 lbm/s. Find: Ans a) b) Ans. The actual kinetic energy of the steam at the exit, in Btu The exit velocity in ft/s for part a) The exit cross sectional area of the nozzle, in in The nozzle isentropic efficiency (%) Show the actual and the ideal...
Problem 4.069 The figure belows shows three components of an air-conditioning system, where T3 115°F and...
Problem 4.069 The figure belows shows three components of an air-conditioning system, where T3 115°F and 4.5 Ib/s. Refrigerant 134a flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Air T 535 R cp = 0.240 Btu/lb-R Saturated liquid...
4: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 40°C...
4: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 40°C in a condenser by air. The air enters at 100 kPa and 27 C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 65°C Determine the mass flow rate of the refrigerant. 5: The hot- water needs of a household are to be met by heating water at 55°F to 180°F by solar collector at a rate of 5...
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?
Question 1 Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80°F with a velocity of 1400 ft/s. The inlet area is 1.4 in2. At the exit, the pressure is 400 lb/in and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in Ib/s, and the exit temperature, in °F
A Refrigeration System Using R-134A In a refrigeration system, the refrigerant R-134A begins as saturated vapor at -15°(State 1). It then goes through a reversible adiabatic compressor to reach State 2. After flowing through the condenser (a heat exchanger), the refrigerant exits as saturated liquid at 70°C (State 3). It is then throttled by going through an expansion valve, to reach State 4. It finishes the cycle by going through another heat exchanger (the evaporator), to return to State 1....
Refrigerant 134a enters a turbine with a mass flow rate of 12 kg/s at 54°C, 3 MPa, while the velocity is negligible. The refrigerant expands in the turbine to a saturated vapor at 400 kPa where 10 percent of the steam is removed for some other use. The remainder of the refrigerant continues to expand to the turbine exit where the pressure is 5 kPa and quality is 75 percent. If the turbine is adiabatic, determine the rate of work...
Problem 2 Let's consider a single-stream problem with a 28-cm diameter pipe where Refrigerant R-134a flows steadily at 200 kPa and 20°C with a velocity of 5 m/s. The refrigerant undergoes a heating process, and leaves at 180 kPa and 40 degrees C 0 R-134a 200 kPa 20°C 5 m/s 180 kPa 40°C 10.2. A. Is this a steady-flow process? Check all that apply. □ Yes, nothing else is mentioned and we need to make this assumption to proceed with...
3. An air-conditioning system is shown in Fig.3, in which air flows over tubes carrying Refrigerant 134a. Air enters with a volumetric flow rate of 50 m3/min at 32°C, 1 bar, and exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat transfer at the outer surface of the air conditioner, and neglecting kinetic and potential energy effects, determine at steady state (a) the mass...
10. (25 Points) Steam enters an insulated nozzle at 140 psia, 600 F with a velocity of 100 ft/s. It leaves the nozzle at 20 psia, 360°F. The mass flow rate is 10 lbm/s. Find: Ans a) b) Ans. The actual kinetic energy of the steam at the exit, in Btu The exit velocity in ft/s for part a) The exit cross sectional area of the nozzle, in in The nozzle isentropic efficiency (%) Show the actual and the ideal...
Problem 4.069 The figure belows shows three components of an air-conditioning system, where T3 115°F and 4.5 Ib/s. Refrigerant 134a flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady-state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Air T 535 R cp = 0.240 Btu/lb-R Saturated liquid...
4: Refrigerant-134a at 1 MPa and 90°C is to be cooled to 1 MPa and 40°C in a condenser by air. The air enters at 100 kPa and 27 C with a volume flow rate of 600 m3/min and leaves at 95 kPa and 65°C Determine the mass flow rate of the refrigerant. 5: The hot- water needs of a household are to be met by heating water at 55°F to 180°F by solar collector at a rate of 5...
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