2) R-134a is the working fluid of a vapor-compression refrigeration cycle. Refrigerant enters the compressor as a saturated vapor at 200kPa, while it exits the condenser as a saturated liquid at 800kPa. Compressor has an isentropic efficiency of 82%. a) If the mass flow rate of R-134a is 0.1 kg/s and the environment temperature is 20°C, determine the coefficient of performance of the cycle and the exergy destruction rate of the compressor in kW. b) What would be the value of the coefficient of performance if the cycle was ideal?

2) R-134a is the working fluid of a vapor-compression refrigeration cycle. Refrigerant enters the compressor as a saturated vapor at 200kPa, while it exits the condenser as a saturated liquid at 800kPa. Compressor has an isentropic efficiency of 82%. a) If the mass flow rate of R-134a is 0.1 kg/s and the environment temperature is 20°C, determine the coefficient of performance of the cycle and the exergy destruction rate of the compressor in kW. b) What would be the value of the coefficient of performance if the cycle was ideal?

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 vapor-compression refrigeration cycle with Refrigerant 134a as the working fluid operates with an evapo-rator temperature of 50◦F and a condenser pressure of 180 lbf/in2Saturated vapor enters the compressor. Refrigerantenters the condenser at 140◦F and exits as saturated liquid. The cycle has a refrigeration capacity of 5 tons (a) the refrigerant mass flow rate, in lb/min. b) the compressor isentropic efficiency. (c) the compressor power, in horsepower. (d) the coefficient of performance.
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A Carnot refrigeration cycle is executed in a closed system in the saturated liquid-vapor mixture region using 1 kg of refrigerant-134a as the working fluid. The maximum and the minimum temperatures in the cycle are 22C and -4C, respectively. If the refrigerant is saturated liquid at the end of the heat rejection process, and the net work input to the cycle is 16 kJ, determine: b) The pressure at the end of the heat rejection process. Should correct please. (Gpt/ai Answer not allowed)
1. An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at -12°C. Determine this system's COP and the amount of power required to service a 150 kW cooling load. Answers: 4.87, 30.8 kW
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Question 3 In a vapour-compression refrigeration system, refrigerant - 134a enters the compressor superheated at 200 kPa and - 5 °C. The refrigerant enters the condenser at 1.4 MPa and 75 °C, and exits at 1.4 MPa as a saturated liquid. 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 105 kW, represent the cycle on a T-s diagram and 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, and (2) d) the isentropic compressor efficiency
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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
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