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2- In vapour compression refrigeration system, compressor is used because a. It increases cooling effect of...
R134a refrigerant In a vapor compression refrigeration system the following observations were noted. Condenser pressure 2...
R134a refrigerant
In a vapor compression refrigeration system the following observations were noted. Condenser pressure 2 bar. Evaporator pressure 0.02 MPa. Sub-cooling 10°C. Super heating 20°C. Estimate the power consumed by compressor, heat absorbed in evaporator, heat rejected in condenser and coefficient of performance. Mark all given data in PH and TS diagram.
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...
4. A water chiller provides 100 tons 3.516 kw/ton of refrigeration to cool water to a...
4. A water chiller provides 100 tons 3.516 kw/ton of refrigeration to cool water to a temperature of 12.10 C for an air conditioning system. The heat extracted from the water is to be rejected in a cooling tower at 35.4°C, Assuming that the chiller operates on an ideal vapour refrigeration cycle with the temperature in the evaporator equal to the chilled water temperature and the saturation temperature in the condenser equal to the cooling tower water temperature, determine (a)...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the...
A 100-ton refrigeration system operates on the simple vapor compression refrigeration system with R-22 as the working fluid. The evaporator pressure is 2 bar and the condenser pressure is 30 bar. The refrigerant leaves the compressor at 160oC. 1 ton of refrigeration = 3.517 kW Determine the cooling load, in kW. Plot all five points (1, 2s, 2a, 3, 4) on the P-h diagram. Determine the power consumed by the refrigeration system, in kW. Determine the COP of the system. Isentropic efficiency...
Problem Statement A vapour compression refrigeration system operates between 12 bar and 1.4 bar. The com-...
Problem Statement A vapour compression refrigeration system operates between 12 bar and 1.4 bar. The com- pressor inlet is superheated by 4K. The mass flow rate of the refrigerant (R131a) is 0.5 kg/s and the refrigeration effect is 65 kW. If the condenser inlet is at 70°C, determine the coeffi- cient of performance of the system and the isentropic efficiency of the compressor. Answer Table Value Description Coefficient of performance Compressor isentropic efficiency (%)
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...
EXAMPLE 6 A household refrigeration system works with a vapor compression refrigeration system with two evaporators...
EXAMPLE 6 A household refrigeration system works with a vapor compression refrigeration system with two evaporators using Refrigerant 134a as the working fluid. This arrangement is used to achieve refrigeration at two different temperatures with a single compressor and a single condenser. The low temperature evaporator operates at -18°C with saturated vapor at its exit and has a refrigerating capacity of 10.5 kW (3 tons). The higher- temperature evaporator produces saturated vapor at 3.2 bar at its exit and has...
determine 1) sub cooling achieved in the heat exchanger, 2) refrigerant flow rate, 3) cop of the plant ii) A refrigeration unit with 100-ton capacity operates in a vapour compression O refrigerati...
determine 1) sub cooling achieved in the heat
exchanger, 2) refrigerant flow rate, 3) cop of the plant
ii) A refrigeration unit with 100-ton capacity operates in a vapour compression O refrigeration cycle between the temperature limits of 308 and 263 K. It uses R-12 G as a refrigerantC A heat exchanger is inducted in the circuit in between the condenser and the expander, The refrigerant vapour leaving the evaporator is superheated in the heat exchanger in the countercurrent flow...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
Please also draw the T-S diagrams and PH diagrams to facilitate understanding. Thank you. 5. The refrigeration system s...
Please also draw the T-S diagrams and PH diagrams to facilitate
understanding. Thank you.
5. The refrigeration system shown below is another variation of the basic vapor compression refrigeration system which attempts to reduce the compression work. In this system, a heat exchanger is used to superheat the vapor entering the compressor while sub-cooling the liquid exiting from the condenser Consider a system of this type that uses refrigerant-134a as its refrigerant and operates the evaporator at -10°C, and the...
R134a refrigerant
In a vapor compression refrigeration system the following observations were noted. Condenser pressure 2 bar. Evaporator pressure 0.02 MPa. Sub-cooling 10°C. Super heating 20°C. Estimate the power consumed by compressor, heat absorbed in evaporator, heat rejected in condenser and coefficient of performance. Mark all given data in PH and TS diagram.
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...
4. A water chiller provides 100 tons 3.516 kw/ton of refrigeration to cool water to a temperature of 12.10 C for an air conditioning system. The heat extracted from the water is to be rejected in a cooling tower at 35.4°C, Assuming that the chiller operates on an ideal vapour refrigeration cycle with the temperature in the evaporator equal to the chilled water temperature and the saturation temperature in the condenser equal to the cooling tower water temperature, determine (a)...
Problem Statement A vapour compression refrigeration system operates between 12 bar and 1.4 bar. The com- pressor inlet is superheated by 4K. The mass flow rate of the refrigerant (R131a) is 0.5 kg/s and the refrigeration effect is 65 kW. If the condenser inlet is at 70°C, determine the coeffi- cient of performance of the system and the isentropic efficiency of the compressor. Answer Table Value Description Coefficient of performance Compressor isentropic efficiency (%)
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...
EXAMPLE 6 A household refrigeration system works with a vapor compression refrigeration system with two evaporators using Refrigerant 134a as the working fluid. This arrangement is used to achieve refrigeration at two different temperatures with a single compressor and a single condenser. The low temperature evaporator operates at -18°C with saturated vapor at its exit and has a refrigerating capacity of 10.5 kW (3 tons). The higher- temperature evaporator produces saturated vapor at 3.2 bar at its exit and has...
determine 1) sub cooling achieved in the heat
exchanger, 2) refrigerant flow rate, 3) cop of the plant
ii) A refrigeration unit with 100-ton capacity operates in a vapour compression O refrigeration cycle between the temperature limits of 308 and 263 K. It uses R-12 G as a refrigerantC A heat exchanger is inducted in the circuit in between the condenser and the expander, The refrigerant vapour leaving the evaporator is superheated in the heat exchanger in the countercurrent flow...
In a vapor-compression refrigeration heat pump cycle with Refrigerant 134a as the working fluid provides heating at a rate of 15 kW to maintain a building at 20 °C year-round. During the heating mode in the winter, the outside temperature is 5 °C. It is also used for cooling in the summer when outside temperature is 34 °C. Saturated vapor at 2.4 bar leaves the evaporator and superheated vapor at 8 bar leaves the compressor. There is no significant heat...
Please also draw the T-S diagrams and PH diagrams to facilitate
understanding. Thank you.
5. The refrigeration system shown below is another variation of the basic vapor compression refrigeration system which attempts to reduce the compression work. In this system, a heat exchanger is used to superheat the vapor entering the compressor while sub-cooling the liquid exiting from the condenser Consider a system of this type that uses refrigerant-134a as its refrigerant and operates the evaporator at -10°C, and the...
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