A refrigeration system using R-12 as refrigerant consists of three evaporators of capacities 20 TR at- 5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the three evaporators are dry and saturated. The system is provided with individual compressors and multiple expansion valves. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is saturated. Assuming isentropic compression in each compressor, find (a) the mass of refrigerant flowing through each evaporator, (b) the power required to drive the system, and (c) the COP. of the system.

A refrigeration system using R-12 as refrigerant consists of three evaporators of capacities 20 TR at- 5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the three evaporators are dry and saturated. The system is provided with individual compressors and multiple expansion valves. The condenser temperature is 40°C and the liquid refrigerant leaving the condenser is saturated. Assuming isentropic compression in each compressor, find (a) the mass of refrigerant flowing through each evaporator, (b) the power required to drive the system, and (c) the COP. of the system.

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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Question

5. A refrigeration system using R-12 as refrigerant consists of throe evaporators of capacities 20 TR at –
5°C, 30 TR at 0°C and 10 TR at 5°C. The vapours leaving the three evaporators are dry and saturated.
The system is provided with individual compressors and multiple expansion valves. The condenser
temperature is 40°C and the liquid refrigerant leaving the condenser is saturatoed. Assuming isentropic
compression in each compressor, find (a) the mass of refrigerant flowing through cach evaporator, (b)
the power required to drive the system, and (c) the C.O.P. of the system.
[Ans. 27.4 kg/min, 42.25 kg/min: 34.12 kg/min; 38.4 kW; 5.56]

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