A Stream of refrigerant -134a at 1MPa and 20 o C is mixed with another stream o at 1MPa and 80 o C. If the mass flow rate of the cold stream is twice that of the hot one, determine the temperature and...
A Stream of refrigerant -134a at 1MPa and 20 o C is mixed with another stream o at 1MPa and 80 o C. If the mass flow rate of the cold stream is twice that of the hot one, determine the temperature and quality of the exit stream
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A Stream of refrigerant -134a at 1MPa and 20 o C is mixed with another stream o at 1MPa and 80 o C. If the mass flow rate of the cold stream is twice that of the hot one, determine the temperature and...
A hot-water stream at 80°C enters a mixing chamber with a mass flow rate of 0.56...
A hot-water stream at 80°C enters a mixing chamber with a mass flow rate of 0.56 kg/s where it is mixed with a stream of cold water at 20°C. If it is desired that the mixture leave the chamber at 42°C, determine the mass flow rate of the cold-water stream. Assume all the streams are at a pressure of 250 kPa. The enthalpies are 335.02 kJ/kg, 83.915 kJ/kg, and 175.90 kJ/kg. The saturation temperature at a pressure of 250 kPa...
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...
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 the expansion valve of an air conditioning unit at 140 Lbf/in2, 80 0F...
Refrigerant 134a enters the expansion valve of an air conditioning unit at 140 Lbf/in2, 80 0F and exits at 50 Lbf/in2. If the refrigerant undergoes a throttling process, what are the temperature and the quality at the exit of the valve? Also determine the rate of entropy production from the inlet to the exit?
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
Refrigerant-134a enters the evaporator coils of a refrigerator at -20°C with a quality of 15 percent...
Refrigerant-134a enters the evaporator coils of a refrigerator at -20°C with a quality of 15 percent and leaves at the same pressure as saturated vapor. If the compressor consumes 450 W of power and the COP the refrigerator is 1.5, determine (a) the mass flow rate of the refrigerant and (b) the rate of heat rejected to the kitchen air.
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until...
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
Consider a constant-area mixer, as shown. The mass flow ratio between the cold and hot streams...
Consider a constant-area mixer, as shown. The mass flow ratio between the cold and hot streams is 3. i.e. "S = 3. The gas properties are: Cpis = 1,004 J/kg.K. Y15 = 1.4 Cps = 1,156J/kg. K and Ys = 1.33. The flow conditions in the inlet to the mixer are: Pis = Pus = 150 kPa, Tus = 500 K and Tis = 880 K. 15 6M) Constant-Area Mixer 5 Assuming the hot gas Mach number is Ms =...
1: A hot-water stream at 95°C enters a mixing chamber where it is mixed with a...
1: A hot-water stream at 95°C enters a mixing chamber where it is mixed with a stream of cold water at 25°C. Assume all the streams are at a pressure of 350 kPa. It is desired that the mixture with a mass flow rate of 0.7 kg/s leaves the chamber at 39°C. Each enthalpy is given by hi hf@95°c = 350 kJ/kg h2 z hr@25°C = 83 kJ/kg h = hf@ 39°C = 175 kJ/kg a. Write down the mass...
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...
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
Refrigerant-134a enters the evaporator coils of a refrigerator at -20°C with a quality of 15 percent and leaves at the same pressure as saturated vapor. If the compressor consumes 450 W of power and the COP the refrigerator is 1.5, determine (a) the mass flow rate of the refrigerant and (b) the rate of heat rejected to the kitchen air.
5. Refrigerant-134a at 700kPa, 70°C, and 8 kg/min is cooled by air in a condenser until it exits as a saturated liquid at the same pressure. The cooling air enters the condenser at 1MPa and 10°C and leaves at 17°C at the same pressure. Determine: a) Considering only the Refrigerant as a system, the heat transfer rate of a refrigerant from the condenser in (kl/min). R-134a Tables are attached! b) The mass flow rate of the air required for cooling...
Consider a constant-area mixer, as shown. The mass flow ratio between the cold and hot streams is 3. i.e. "S = 3. The gas properties are: Cpis = 1,004 J/kg.K. Y15 = 1.4 Cps = 1,156J/kg. K and Ys = 1.33. The flow conditions in the inlet to the mixer are: Pis = Pus = 150 kPa, Tus = 500 K and Tis = 880 K. 15 6M) Constant-Area Mixer 5 Assuming the hot gas Mach number is Ms =...
1: A hot-water stream at 95°C enters a mixing chamber where it is mixed with a stream of cold water at 25°C. Assume all the streams are at a pressure of 350 kPa. It is desired that the mixture with a mass flow rate of 0.7 kg/s leaves the chamber at 39°C. Each enthalpy is given by hi hf@95°c = 350 kJ/kg h2 z hr@25°C = 83 kJ/kg h = hf@ 39°C = 175 kJ/kg a. Write down the mass...
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