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
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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![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]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F365703ac-4e9d-4636-96e0-d26bac067dba%2F8ea3305a-225a-48be-ac75-a8a1ba14a98b%2F0wm97t8_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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]
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