8. Consider a two stage compressor refrigeration system operating between the pressure limit of 0.8and 0.14 MPa. The working fluid is R - 134a. The refrigerant leaves the condenser as a saturatedliquid and is throttled to a flash chamber operating at 0.4 MPa. Part of the refrigerant evaporatesduring this flashing process, and this vapour is mixed with the refrigerant leaving the low pressure2 of3HeatexchangerRegeneratorHeatexchangerCompressorTurbineFigure 1: An Gas refrigeration systemcompressor. The mixture is then compressed to the condenser pressure by high pressure compressorThe liquid in the flash chamber is throttled to the evaporator pressure, and it cools the refrigeratedspace as it vaporizes in the evaporator. Assuming the refrigerant leaves the evaporator as saturatedvapour and both the compressor are isentropic, determine(a) the fraction of the refrigerant that evaporates as it is throttled to the flash chamber, 0.165(b) the amount of heat removed from the refrigerated space and the compressor work per unit mass146.4 kJ/kg, 32.6 kJ/kg|of the refrigerant flowing through the condenser, and4.49(c) the COP-End3 of 3

Answered: 8. Consider a two stage compressor…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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750 kPa 800 kPa 55°C Condenser (3) Expansion valve Compressor Evaporator Figure 3 4. The liquid leaving the condenser of a 30 kW heat pump using refrigerant 134a as the working fluid is subcooled by 5.4°C. The condenser operates at 1 MPa and the evaporator at 0.4 MPa. How does this subcooling change the power required to drive the compressor as compared to an ideal vapour-compression refrigeration cycle? (3.41 kW, 3.25 kW)
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ai 10roh Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.32 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor and the isentropic efficiency is 85 percent for both compressors, determine (a) the mass flow rate of the refrigerant through the high-pressure compressor, (b) the rate of heat removal…
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