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2. Convert the P-H diagram shown (for all steps 1 to 4) that represents an ideal...
refrigerator, as shown in FIGURE P 3 with the corresponding T-s diagram, uses refrigerant R-134a as...
refrigerator, as shown in FIGURE P 3 with the corresponding T-s diagram, uses refrigerant R-134a as the working fluid and operates on the ideal vapour-compression refrigeration cycle except for the compression process. The refrigerant enters the evaporator at 120 kPa with a quality of 34.026 percent and leaves the compressor at 70 0C. If the compressor consumes 0.45 kW of power, Determine: (a) The mass flow rate of the refrigerant, in kg/s, correct to 6 dp. (b) The condenser pressure,...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
4. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- f...
4. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below.Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to S "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow rate of...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as shown. Refrigerant 134a leaves the evaporator as saturated vapor at 0.10 MPa and is heated at constant pressure to 20°C before entering the compressor. Following isentropic compression to 1.4 MPa, the refrigerant passes through the condenser and exits at 45°C and 1.4 MPa. The liquid then passes through the heat exchanger and enters the expansion valve at 1.4 MPa. The mass flow rate of...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity is 30 TR. The evaporator works at -10 Cand the condenser pressure is 1 MPa. The refrigerant is superheated by 10°C before entering to the compressor. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Answering the following questions using the ph diagram. and the c Sion in the ring to a) Sketch the process in the p-h diagram and...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to 5 "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 C, 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow...
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....
An ideal vapor-compression refrigeration cycle with R-134a as the working fluid has an evaporator temperature of-15...
An ideal vapor-compression refrigeration cycle with R-134a as the working fluid has an evaporator temperature of-15 °C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3.5 kg/min. Draw and label the cycle on a T-s diagram. What is the coefficient of performance? Ans. 2.98 What is the refrigerating capacity in tons? a. b. c.
Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigerat...
Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Show the cycle on a T-s diagram with respect to saturation lines and determine (a) the quality of the refrigerant at the end of the throttling process, (b) coefficient of performance, (c) the power input to the compressor , (d) Generation of entropy...
The coefficient of performance-of vapor-compression refrigeration cycles
a) The coefficient of performance-of vapor-compression refrigeration cycles improves when the refrigerant is subcooled before it enters the throttling valve Can the refrigerant be subcooled indefinitely to maximize this effect, or is there a lower limit? Explain brieflyb) A two-stage compression refrigeration system with a flash chamber is used to produce chilled water for a commercial building The refrigeration system operates between a pressure limits of 1 2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves...
Problem #1 [30 Points] Vapor Compression Refrigeration Cycle An ideal vapor compression refrigeration system cycle, with ammonia as the working fluid, has an evaporator temperature of -20°C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of refrigerant is 3 kg/minute. Determine the coefficient of performance and the refrigerating capacity in tons. Given: Find: T-s Process Diagram: Schematic Assume:
4. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below.Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to S "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow rate of...
Condenser Compressor An ideal vapor-compression refrigeration cycle is modified to include a counter-flow heat exchanger as shown. Refrigerant 134a leaves the evaporator as saturated vapor at 0.10 MPa and is heated at constant pressure to 20°C before entering the compressor. Following isentropic compression to 1.4 MPa, the refrigerant passes through the condenser and exits at 45°C and 1.4 MPa. The liquid then passes through the heat exchanger and enters the expansion valve at 1.4 MPa. The mass flow rate of...
ycles 1. A refrigeration system operates with a superheated cycle using R134a. The required refrigerating capacity is 30 TR. The evaporator works at -10 Cand the condenser pressure is 1 MPa. The refrigerant is superheated by 10°C before entering to the compressor. Assume isentropic compression in the compressor and isenthalpic expansion in the expansion valve. Answering the following questions using the ph diagram. and the c Sion in the ring to a) Sketch the process in the p-h diagram and...
2. (10 points) An ideal vapor-compression refrigeration cycle is modified to include a counter- flow heat exchanger, as shown below. Ammonia leaves the evaporator as saturated vapor at 1.0 bar and is heated at constant pressure to 5 "C before entering the compressor. Following isentropic compression to 18 bar, the refrigerant passes through the condenser, exiting at 40 C, 18 bar. The liquid then passes through the heat exchanger, entering the expansion valve at 18 bar. If the mass flow...
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....
An ideal vapor-compression refrigeration cycle with R-134a as the working fluid has an evaporator temperature of-15 °C and a condenser pressure of 12 bar. Saturated vapor enters the compressor, and saturated liquid exits the condenser. The mass flow rate of the refrigerant is 3.5 kg/min. Draw and label the cycle on a T-s diagram. What is the coefficient of performance? Ans. 2.98 What is the refrigerating capacity in tons? a. b. c.
Consider a 300 kJ/min refrigeration system that operates on an ideal vapor-compression refrigeration cycle with R-134a as the working fluid. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Show the cycle on a T-s diagram with respect to saturation lines and determine (a) the quality of the refrigerant at the end of the throttling process, (b) coefficient of performance, (c) the power input to the compressor , (d) Generation of entropy...
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