aAn ideal vapor-compressionAn ideal vapor-compressionrefrigeration system usesrefrigerant - 22 as workingrefrigeration system usesrefrigerant - 22 as working fluid.Saturated vapor at - 40°Cfluid. Saturated vapor at - 40°Centers the compressor suctionenters the compressor suctionat the rate of 15 m^3/min.at the rate of 15 m^3/min.Condenser pressure is 1200 kPa.Condenser pressure is 1200Calculate the coefficient ofkPa. Calculate the compressorperformance.power, in kW. *An ideal vapor-compression1refrigeration system usesrefrigerant - 22 as workingfluid. Saturated vapor at - 40°Centers the compressor suctionat the rate of 15 m^3/min.Condenser pressure is 1200kPa. Calculate the refrigeratingcapacity, in tons.

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a b An ideal vapor-compression refrigeration system uses refrigerant - 22 as working fluid Saturated vapor at - 40°C An ideal vapor-compression refrigeration system uses refrigerant - 22 as working fluid. Saturated vapor at - 40°C enters the compressor suction enters the compressor suction at the rate of 15 m^3/min. at the rate of 15 m^3/min. Condenser pressure is 1200 kPa. Calculate the compressor Condenser pressure is 1200 kPa Calculate the coefficient of performance. power, in kW. * An ideal vapor-compression refrigeration system uses refrigerant - 22 as working fluid. Saturated vapor at - 40°C enters the compressor suction at the rate of 15 m^3/min. Condenser pressure is 1200 kPa. Calculate the refrigerating capacity, in tons.

a b An ideal vapor-compression refrigeration system uses refrigerant - 22 as working fluid Saturated vapor at - 40°C An ideal vapor-compression refrigeration system uses refrigerant - 22 as working fluid. Saturated vapor at - 40°C enters the compressor suction enters the compressor suction at the rate of 15 m^3/min. at the rate of 15 m^3/min. Condenser pressure is 1200 kPa. Calculate the compressor Condenser pressure is 1200 kPa Calculate the coefficient of performance. power, in kW. * An ideal vapor-compression refrigeration system uses refrigerant - 22 as working fluid. Saturated vapor at - 40°C enters the compressor suction at the rate of 15 m^3/min. Condenser pressure is 1200 kPa. Calculate the refrigerating capacity, in tons.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. The refrigeration load is 28 tons. h6 = 366 kJ/kg; h2= 421 kJ/kg Determine the ff:a.) the mass flow rate in the low pressure loop,ANSWER: 0.5097287949549 kg/s b.) the mass flow rate in the high pressure loop,ANSWER: 0.94987995754451 kg/s c.) total power requirementANSWER: 32.1224 KW
2. An R22 standard refrigeration system carries a refrigerating load of 82 kW. The suction and discharge pressures of the compressor are 354.3 kPa and 1460.1 kPa respectively. The liquid refrigerant is subcooled by 4° before entering the expansion valve and the vapor is superheated by 5° before entering the compressor. The twin- cylinder, single-acting efficiency, 82%; clearance volume, 6%; and mechanical efficiency, 78% compressor operates at 1680 rpm; stroke-to-bore ratio, 1.20; actual volumetric Determine (a) mass flow rate of refrigerant in kg/s (b) mass flow rate of refrigerant per ton of refrigeration in kg/s-ton (c) work on compressor in kW
A vapor-compression refrigeration system which utilizes refrigerant 134a as the working fluid comprises the two-stage compression configuration seen in the schematic below, with intercooling between the stages. 5 Condenser Expansion valve High-pressure compressor 6 3 Flash chamber 9 2 7 Expansion valve Low-pressure compressor Evaporator 1 The direct contact heat exchanger and the flash drum operate at 4 MPa, and the condenser pressure is 1.2 MPa. Saturated vapor at -30 °C enters the first compressor stage. Saturated liquid streams at 0.4 MPa and 1.2 MPa enter the low- and high-pressure expansion valves, respectively. The refrigeration capacity of the system is estimated to be 35.2 kW and each compressor is assumed to operate isentropically. Evaluate each compressor power input and the overall coefficient of performance of the system.
42. Refrigerant-12 enters the condenser of a vapor-compression refrigera- tion system at 175 psia and 140°F and leaves as saturated liquid at 120°F. Mass flow rate of the refrigerant is 4.8 lbm/min. The heat is rejected to the surrounding air, which is at 90°F. Determine: (a) Heat rejection rate, Btu/hr. 22 (b) Separate the overall entropy changes per hour (Freon and sur- roundings). 23/
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Data for steady-state operation of a vapor-compression refrigeration cycle with Refrigerant 134a as theworking fluid are given in the table below. State 1 is at the compressor inlet. The cooling capacity (i.e therate at which heat is removed from the cooled space) is 4.6 tons. 1 ton of refrigeration is equivalent to211 kJ/min. Ignoring heat transfer between the compressor and its surroundings, sketch the ?-? diagramof the cycle and determinea) the mass flow rate of the refrigerant, in kg/min.b) the isentropic compressor efficiency.c) the coefficient of performance.State ? (bar) ? (°C) ℎ (kJ/kg) ? (kJ/kg-K)
Refrigerant 22 is the working fluid in a Carnot vapor refrigeration cycle for which the evaporator temperature is -30°C. Saturated vapor enters the condenser at 36°C, and saturated liquid exits at the same temperature. The mass flow rate of refrigerant is 10 kg/min. Determine the quality of refrigerant at inlet of compressor, (A) 0.9430 B 0.6931 C 0.7931 D 0.8931