In an ideal vapor-compression refrigeration cycle, the refrigerant enters the compressor asa saturated vapor and is cooled to the saturated liquid state in the condenser. It is thenthrottled to the evaporator pressure and vaporizes as it absorbs heat from the refrigeratedspace. Figure Q3.1 depicts the description of this process.WarmenvironmentQHCondenserExpansionvalveCompressorEvaporatorCold refrigeratedspaceFigure Q3.1: Ideal vapor-compression refrigeration cycle.Assuming a refrigerator operates on this principle and uses refrigerant-134a as theworking fluid, answer the following questions.(a) The condenser operates at 1.6 MPa and the evaporator at -6°C. If an adiabatic,reversible expansion device was available and used to expand the liquid leaving thecondenser,(i) Calculate the COP improve by using this device instead of the throttle device.(ii)Illustrate a T-s diagram that represents the ideal vapor-compression refrigerationcycle described in (a)

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(a) The condenser operates at 1.6 MPa and the evaporator at -6°C. If an adiabatic, reversible expansion device was available and used to expand the liquid leaving the condenser, (i) Calculate the COP improve by using this device instead of the throttle device. (ii)Illustrate a T-s diagram that represents the ideal vapor-compression refrigeration cycle described in (a)

(a) The condenser operates at 1.6 MPa and the evaporator at -6°C. If an adiabatic, reversible expansion device was available and used to expand the liquid leaving the condenser, (i) Calculate the COP improve by using this device instead of the throttle device. (ii)Illustrate a T-s diagram that represents the ideal vapor-compression refrigeration cycle described in (a)

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 commercial refrigerator using isobutane (r600a) operates on the simple saturation cycle with saturated suction and discharge temperature of "-25" °c and 55 °c respectively: (a) calculate the cop and power required to run the compressor per ton of refrigeration. (b) if the liquid is subcooled by 10 °c in the condenser, calculate the cop and power required to run the compressor per ton of refrigeration.
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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