4. A cascade refrigeration system is required to produce 20 TR of refrigeration. It uses R12 in low temperature cycle with evaporator temperature of -40°C and cascade condenser temperature of -20°C. Ammonia is used in the high temperature cycle with cascade evaporator temperature of -30°C and condenser temperature of 20°C. Find the COP of the combined cycle. Assume saturated conditions of both refrigerants at the exit of evaporators and condensers and ideal cascade heat exchanger. For properties of R12 and ammonia, refer to p-h charts. [Ans: COP of combined cycle is 2.548]

4. A cascade refrigeration system is required to produce 20 TR of refrigeration. It uses R12 in low temperature cycle with evaporator temperature of -40°C and cascade condenser temperature of -20°C. Ammonia is used in the high temperature cycle with cascade evaporator temperature of -30°C and condenser temperature of 20°C. Find the COP of the combined cycle. Assume saturated conditions of both refrigerants at the exit of evaporators and condensers and ideal cascade heat exchanger. For properties of R12 and ammonia, refer to p-h charts. [Ans: COP of combined cycle is 2.548]

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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