Refrigerant 134a is the working fluid in an ideal vapor-compression refrigeration cycle operating at steady state. Refrigerant enters the compressor at 1.8 bar, -12°C, and the condenser pressure is 9 bar. Liquid exits the condenser at 32°C. The mass flow rate of refrigerant is 7 kg/min.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 2 bar, and saturated liquid exits the condenser at 8 bar. The isentropic compressor efficiency is 80 %. The mass flow rate of refrigerant is 7 kg/min. Sketch the process on a T-s diagram and determine; I) the compressor power, in kW Ii) the refrigeration capacity, in tons III) the coefficient of performance.
A vapor-compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 2 bar, and saturated liquid exits the condenser at 8 bar. The isentropic compressor efficiency is 80 %. The mass flow rate of refrigerant is 7 kg/min. Sketch the process on a T-s diagram and determine; the compressor power, in kW the refrigeration capacity, in tons the coefficient of performance.
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A vapor compression refrigeration cycle operates at steady state with Refrigerant 134a as the working fluid. Saturated vapor enters the compressor at 2 bar, and saturated liquid exist the condenser at 8 bar. The isentropic compresser efficiency is 80%. The mass flow rate of refrigerant is 7 kg/min. Sketch the process on a T-s diagram and determine; i. the compressor power, in kW ii. the refrigeration capacity, in tons iii. the coefficient of performance
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Consider a refrigeration system that operates on an actual vapor-compression refrigeration cycle with refrigerant 134a as the working fluid with an isentropic efficiency of a compressor of 75.1%. The refrigerant enters the compressor as saturated vapor at 140 kPa and is compressed to 800 kPa. Determine the value of h2 in kj/hg, answer in 4 decimal places with unit analysis. Subject: Thermodynamics 2
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In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant enters the condenser at 16 bar and 190°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.If the refrigerating capacity is 50 kW, determine:(a) the mass flow rate of the refrigerant, in kg/s.(b) the power input to the compressor, in kW.(c) the coefficient of performance.(d) the isentropic compressor efficiency, in percent.(e) the rate of entropy production, in kW/K, for the compressor.
What is the COP of an ideal heat-operated refrigeration cycle that receives the energizing heat from a solar collector at a temperature of 70 °C, performs refrigeration at 15 °C, and rejects heat to atmosphere at a temperature of 40°C?
An ideal vapor-compression refrigeration cycle employs refrigerant 134a as the working fluid and operates at a steady state. At the compressor inlet, saturated vapor enters a -20 degrees celcius, and the saturated liquid leaves the condenser at 42 degrees celcius. The mass flow rate of the refrigerant is 0.5 kg/s. Determine: a) The rate of heat rejection from the condenser in kW b) The compressor power in kW c) The coefficient of performance