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4. A water chiller provides 100 tons 3.516 kw/ton of refrigeration to cool water to a...
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...
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...
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 transfer...
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...
Q3. A water chiller (refrigeration plant) uses a flooded evaporator in which the liquid refrigera...
Q3. A water chiller (refrigeration plant) uses a flooded evaporator in which the liquid refrigerant flows through the shell and the water flows within the tubes inside the shell. The flow rate of refrigerant is controlled so that the tubes are always covered with liquid refrigerant. The refrigerant used is 134a (tetrafluoroethane). It enters the evaporator at -13°C. The tubes are maintained at a temperature of 5°C by the water being cooled. The total area of the coil within the...
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...
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;...
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C....
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C. The wide temperature range is difficult to achieve with a single refrigerant, because the refrigerant will generally be at excessively high pressures at the top of the temperature range, and sub-atmospheric pressures at the bottom end The problem is solved with a 2-stage cascaded system that uses refrigerant 134a (R134a) and refrigerant 22 (R22) respectively for the high temperature...
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...
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at by The refrigerant enters the condenser at compressor consumes 3.3 kW of power, dete...
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at by The refrigerant enters the condenser at compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (e) the COP, and (d) the g waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. 1.2 MPa and 50°C and leaves at the same...
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...
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...
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 transfer...
Q3. A water chiller (refrigeration plant) uses a flooded evaporator in which the liquid refrigerant flows through the shell and the water flows within the tubes inside the shell. The flow rate of refrigerant is controlled so that the tubes are always covered with liquid refrigerant. The refrigerant used is 134a (tetrafluoroethane). It enters the evaporator at -13°C. The tubes are maintained at a temperature of 5°C by the water being cooled. The total area of the coil within the...
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...
Problem #1 (40 Marks) A refrigeration system is designed to maintain a cool space at -20°C in arn environment of +50°C. The wide temperature range is difficult to achieve with a single refrigerant, because the refrigerant will generally be at excessively high pressures at the top of the temperature range, and sub-atmospheric pressures at the bottom end The problem is solved with a 2-stage cascaded system that uses refrigerant 134a (R134a) and refrigerant 22 (R22) respectively for the high temperature...
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...
A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at by The refrigerant enters the condenser at compressor consumes 3.3 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (e) the COP, and (d) the g waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. 1.2 MPa and 50°C and leaves at the same...
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