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refrigeration system is required to supply 20 tons of refrigeration at an evaporator Qi: A cascade enerature of -50...
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...
2. MULTIPLE EVAPORATOR/ EXPANSION VALVE A refrigeration installation using Freon 12, comprises one compressor, one condenser...
2. MULTIPLE EVAPORATOR/ EXPANSION VALVE A refrigeration installation using Freon 12, comprises one compressor, one condenser and three evaporators of 10 tonnes, 20 tonnes, and 30 tonnes capacities maintained at 10 C, 5 C and -10 C respectively. The system comprises multiple expansion valves and back pressure check valves. The condenser pressure is 9.609 bar (saturation temp. 40 C). The vapours leaving the evaporator are dry saturated. The liquid refrigerant is sub-cooled by 10 C in the condenser sub-cooler. Assume...
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...
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...
5/An ammonia refrigeration system consists of two stages compressors, two cvaporators, flash intereooler and sub-cooler, heat...
5/An ammonia refrigeration system consists of two stages compressors, two cvaporators, flash intereooler and sub-cooler, heat exchanger and condenser. Ammonia vapor condenses in the condenser at 40 "C. The amount of liquid refrigerant goes to the low temperature evaporator is sub-cooled 10 °C in the liquid sub- cooler and another 10 °C in the liquid-vapor heat exchanger. Vapor leaves the low pressure evaporator saturated at -30 °C, and then it is superheated in the heat exchanger at the same 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:
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....
A two-stage cascade refrigeration system operates between the pressure limits of 1.4MPa and 200 kPa with...
A two-stage cascade refrigeration system operates between the pressure limits of 1.4MPa and 200 kPa with refrigerant-134a. The fluid leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.50 MPa. Part of the refrigerant evaporates in the flashing process, and this vapor is mixed with the refrigerant leaving the low-pressurin compressor. The liguid in the flash chamber iS throttled to the evaporator pressure and cools the refrigerated space. The mass flow rate 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 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...
2. MULTIPLE EVAPORATOR/ EXPANSION VALVE A refrigeration installation using Freon 12, comprises one compressor, one condenser and three evaporators of 10 tonnes, 20 tonnes, and 30 tonnes capacities maintained at 10 C, 5 C and -10 C respectively. The system comprises multiple expansion valves and back pressure check valves. The condenser pressure is 9.609 bar (saturation temp. 40 C). The vapours leaving the evaporator are dry saturated. The liquid refrigerant is sub-cooled by 10 C in the condenser sub-cooler. Assume...
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...
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...
5/An ammonia refrigeration system consists of two stages compressors, two cvaporators, flash intereooler and sub-cooler, heat exchanger and condenser. Ammonia vapor condenses in the condenser at 40 "C. The amount of liquid refrigerant goes to the low temperature evaporator is sub-cooled 10 °C in the liquid sub- cooler and another 10 °C in the liquid-vapor heat exchanger. Vapor leaves the low pressure evaporator saturated at -30 °C, and then it is superheated in the heat exchanger at the same pressure....
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:
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....
A two-stage cascade refrigeration system operates between the pressure limits of 1.4MPa and 200 kPa with refrigerant-134a. The fluid leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.50 MPa. Part of the refrigerant evaporates in the flashing process, and this vapor is mixed with the refrigerant leaving the low-pressurin compressor. The liguid in the flash chamber iS throttled to the evaporator pressure and cools the refrigerated space. The mass flow rate of...
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.
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