What are the four key units of a vapor compression refrigeration cycle? What are the functions...
What are the four key units of a vapor compression refrigeration cycle? What are the functions of each of them? How does a home refrigerator expel heat to a hotter environment from a cold interior of the refrigerator?
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What are the four key units of a vapor compression
refrigeration cycle? What are the functions...
A freezer is designed, based on vapor-compression refrigeration cycle. The designed conditions are: R-134a as refrigerant,...
A freezer is designed, based on vapor-compression refrigeration cycle. The designed conditions are: R-134a as refrigerant, with a cooling capacity of 500 kW; compressor of 70% efficiency, with a superheat of 10°C before compressor inlet; operation temperature of -10°C inside the refrigerator, with the environment temperature of 25°C outside the refrigerator; Determine the pressure range of refrigeration cycle if a 10°C difference is required to ensure effective heat transfer of evaporator and condenser; Plot the refrigeration cycle on P-h diagram;...
A refrigerator operates on an ideal vapor compression refrigeration cycle with R-134a as the working fluid....
A refrigerator operates on an ideal vapor compression refrigeration cycle with R-134a as the working fluid. The evaporator pressure is 0.12 MPa and the condenser pressure is 0.8 MPa. If the rate of heat removal from the refrigerated space is 32 kJ/s, the mass flow rate of refrigerant is
An ideal vapor compression refrigeration cycle uses refrigerant 12 as a working fluid in an air...
An ideal vapor compression refrigeration cycle uses refrigerant 12 as a working fluid in an air conditioning system. The refrigerant enter the compressor as saturated vapor at 5oC and leaves the condenser as saturated liquid at 55oC. The mass flow rate of refrigerant is 0.7 kg/s. Heat is transferred from a reservoir at 15oC (the cool space) to the refrigerant in the evaporator and the heat rejected by the condenser is transferred to the environment which is at a temperature...
1. Wet Compression Refrigerator A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R-12...
1. Wet Compression Refrigerator A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R-12 as a and an evaporator temperature of -33 °C. The system runs on the wet compression cycle. Determine (a) the refrigeration in [kJ/kg], (b) the circulating rate of R-12 in [kg/s], (c) the power required, (d) the COR, (e) the heat rejected in [kW], and (f) the volume flowrate of refrigerant at compressor inlet conditions. qin 87.5 kJ/kg COR 2.16 refrigerant while operating between...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22 °C. There...
In a vapor-compression refrigeration cycle, ammonia exits the
evaporator as saturated vapor at -22 °C. There are
irreversibilities in the compressor. The refrigerant enters the
condenser at 16 bar and 160 °C, and saturated liquid exits at 16
bar. There is no significant heat transfer between the compressor
and its surroundings, and the refrigerant passes through the
evaporator with a negligible change in pressure.
Calculate the coefficient of performance, b, and the isentropic
compressor efficiency, defined as:
2s Condenser Expansion...
11-11 A refrigerator operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working...
11-11 A refrigerator operates on the ideal vapor-compression refrigeration cycle and uses refrigerant-134a as the working fluid. The condenser operates at 1.6 MPa and the evaporator at -6oC. If an adiabatic, reversible expansion device were available and used to expand the liquid leaving the condenser, how much would the COP improve by using this device instead of the throttle device?
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...
The mass flow rate of R-134a in a vapor-compression refrigeration cycle is 6 kg/min
The mass flow rate of R-134a in a vapor-compression refrigeration cycle is 6 kg/min. At the inlet of the compressor, R-134a is at -10°C, 150 kPa. The pressure at the compressor exit is 600 kPa. The compressor has an isentropic efficiency of 67%. The refrigerant leaves the condenser at 20°C. Neglect any pressure drops in the condenser, the evaporator, and pipes. Assume an adiabatic compressor. (a)draw the cycle and the T-s diagram of the cycle. Also find: (b)the coefficient of the performance...
1. Wet Compression Refrigerator A standard vapor-compression refrigeration system produces 20 tons of refrigeration using R-12 as a and an evaporator temperature of -33 °C. The system runs on the wet compression cycle. Determine (a) the refrigeration in [kJ/kg], (b) the circulating rate of R-12 in [kg/s], (c) the power required, (d) the COR, (e) the heat rejected in [kW], and (f) the volume flowrate of refrigerant at compressor inlet conditions. qin 87.5 kJ/kg COR 2.16 refrigerant while operating between...
11-14 A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa. The mass flow rate of the refrigerant is 0.05 kg/s. Show the cycle on a T-s diagram with respect to saturation lines. Determine (a) the rate of heat removal from the refrigerated space and the power input to the compressor, (b) the rate of heat rejection to the environment, and (c) the coefficient of performance. Answers: (a) 7.41...
In a vapor-compression refrigeration cycle, ammonia exits the
evaporator as saturated vapor at -22 °C. There are
irreversibilities in the compressor. The refrigerant enters the
condenser at 16 bar and 160 °C, and saturated liquid exits at 16
bar. There is no significant heat transfer between the compressor
and its surroundings, and the refrigerant passes through the
evaporator with a negligible change in pressure.
Calculate the coefficient of performance, b, and the isentropic
compressor efficiency, defined as:
2s Condenser Expansion...
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...
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