In an ideal vapor compression cycle operating between 1.2 bar and 8 bar using R-410A as the refrigerant, which removes heat from a cold space at a rate of 100kW. If the condenser outlet was subcooled by 2°C below saturation, which of the following is TRUE? I.The required mass flow of the refrigerant will decrease. II. The COP of the ref will increase. a. Neither I nor II b. Both I and II c. II only d. I only

In an ideal vapor compression cycle operating between 1.2 bar and 8 bar using R-410A as the refrigerant, which removes heat from a cold space at a rate of 100kW. If the condenser outlet was subcooled by 2°C below saturation, which of the following is TRUE? I.The required mass flow of the refrigerant will decrease. II. The COP of the ref will increase. a. Neither I nor II b. Both I and II c. II only d. I only

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

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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Consider the ideal vapor compression cycle operating between 1.4 bar and 9bar using R-125 as the refrigerant, which removes heat from a cold space at a rate of 100kW. If the evaporator outlet was suddenly superheated by 2℃ above saturation, what will be the resulting effect on the cycle? a.Refrigerant flowrate will decrease, Condenser duty will decrease b.Refrigerant flowrate will increase, Condenser duty will decrease c.Refrigerant flowrate will increase, Condenser duty will increase d.Refrigerant flowrate will decrease, Condenser duty will increase
A refrigerator operating using vapor-compression cycle uses R-134a as a working fluid. The condenser temperature is 65oC and the evaporator temperature is -15oC. The compressor operates at 80% efficiency. a. Determine the coefficient of performance of the refrigeration cycle. b. How much refrigerant is needed to deliver 3 kW of cooling? c. Sketch the vapor compression cycle indicating the states of each stream (in terms of H, P, T, and S) and showing the values of energy input/output in the system d. Suppose that we replace the expansion valve in the vapor- compression cycle with a turbine that operates at 80% efficiency. Determine the coefficient of performance of the refrigeration cycle. Provide the new state properties (i.e. H, P, T and S) for this changes Please use CATT for any values needed
Consider the ideal vapor compression cycle operating between 1.2 bar and 8 bar using R-410A as the refrigerant, which removes heat from a cold space at a rate of 100kW. If the condenser outlet was subcooled by 2°C below saturation, which of the following is TRUE?I. The required mass flow of the refrigerant will decrease.II. The COP of the ref will increase. a. Neither I nor IIb. I onlyc. II onlyd. Both I and II
3) In a multistage vapor-compression refrigeration cycle, refrigerant 134a is the working fluid. Saturated vapor enters the first compressor stage at T, = -30°C. The flash chamber operates at 0.4MPA, and the condenser pressure is 1.2MPA. Saturated liquid streams at 1.2MPa and 0.4MP enter the high- and low-pressure expansion valves, respectively. If compressors are isentropic and QL = 35kW determine the coefficient of performance of the refrigeration system. Warm environment Condenser Expansion valve High-pressure compressor Flash chamber 1-0 Low-pressure Expansion valve compressor Evaporator Cold refrigerated space
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)
A) A refrigerator that operates on the ideal vapor-compression cycle with refrigerant-134a is to maintain the refrigerated space at -10°C while rejecting heat to the environment at 25°C. Select reasonable pressures for the evaporator and the condenser and explain your choice.
I only need help with letter (e). 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.
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A Carnot vapor refrigeration cycle uses R-134a as the working fluid The refrigerant enters the condenser as saturated vapor at 28°C and leaves as saturated liquid. The evaporator operates at a temperature of 10°C. For every kg of refrigerant flow, calculate the amount o heat absorbed in the evaporator, kJ.