2. THE EVENTS OF A CASCADE, A PLIT-STAGE, LOW-TEMPERATURE REFRIGERATING CYCLE ARE AS FOLLOWS: AN AMMONIA VAPOR COMPRESSION SYSTEM OPERATES BETWEEN - 10C AND 33C WITH SATURATED LIQUID ON THE HIGH SIDE OF THE EXPANSION VALVE AND SATURATED VAPOR ENTERING THE COMPRESOR WHOSE VOLUMETRIC EFFICIENCY iS 89%. A R-11 COMPRESSION SYSTEM OPERATES BETWEEN -25C AND OC WITH SATURATED LIQUID ENTERING THE EXPANSION VALVE AND SATURATED VAPOR ENTERING THE COMPRESSOR WHOSE VOLUMETRIC EFFICIENCY IS 85%. THE AMMONIA EVAPORATOR SERVES AS THE CONDENSER OF THE R-11. FOR THE IDEAL CYCLE AND 10KW OF REFRIGERATION, FIND (a) THE DISPLACEMENT RATE OF EACH COMPRESSOR, AND (b) THE TOTAL ACTUAL POWER REQUIRED FOR COMPRESSION EFFICIENCIES OF 85%.

2. THE EVENTS OF A CASCADE, A PLIT-STAGE, LOW-TEMPERATURE REFRIGERATING CYCLE ARE AS FOLLOWS: AN AMMONIA VAPOR COMPRESSION SYSTEM OPERATES BETWEEN - 10C AND 33C WITH SATURATED LIQUID ON THE HIGH SIDE OF THE EXPANSION VALVE AND SATURATED VAPOR ENTERING THE COMPRESOR WHOSE VOLUMETRIC EFFICIENCY iS 89%. A R-11 COMPRESSION SYSTEM OPERATES BETWEEN -25C AND OC WITH SATURATED LIQUID ENTERING THE EXPANSION VALVE AND SATURATED VAPOR ENTERING THE COMPRESSOR WHOSE VOLUMETRIC EFFICIENCY IS 85%. THE AMMONIA EVAPORATOR SERVES AS THE CONDENSER OF THE R-11. FOR THE IDEAL CYCLE AND 10KW OF REFRIGERATION, FIND (a) THE DISPLACEMENT RATE OF EACH COMPRESSOR, AND (b) THE TOTAL ACTUAL POWER REQUIRED FOR COMPRESSION EFFICIENCIES OF 85%.

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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PART A ONLY ( USE IMAGE BELOW) In a standard ideal refrigeration cycle (Fig. 1), the refrigerant 134a enters adiabatically isolated expansion valve as a saturated liquid at a pressure P1 = 1 MPa and leaves the device at a pressure P2 = 100kPa. Then the refrigerant enters the evaporator, where it changes into the saturated vapor. Subsequently, the vapor is compressed in an isentropic compressor to the pressure 1MPa and condensed in the condenser back to the initial saturated-liquid state. PART A - Determine the heat qL absorbed by the refrigerant in the evaporator and the compressor work win (per 1 kg of the refrigerant).
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