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3. A two-stage cascade vapor-compression refrigeration system uses R-12 produces 15 tons of refrigeration. A direct-contact heat exchanger is the cascade condenser. The low temperature evaporator pressure is 100 kPa, and the condenser pressure is 1000 kPa. The intermediate pressure is optimum. Determine (a) the mass flow rate in the upper and lower stages, (b) the total input power for the compressors, and (c) the COP.

3. A two-stage cascade vapor-compression refrigeration system uses R-12 produces 15 tons of refrigeration. A direct-contact heat exchanger is the cascade condenser. The low temperature evaporator pressure is 100 kPa, and the condenser pressure is 1000 kPa. The intermediate pressure is optimum. Determine (a) the mass flow rate in the upper and lower stages, (b) the total input power for the compressors, and (c) the COP.

Elements Of Electromagnetics
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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Refrigeration Engineering. Draw the necessary diagrams

3. A two-stage cascade vapor-compression refrigeration system uses R-12 produces 15 tons of refrigeration. A direct-contact heat exchanger is the cascade condenser. The low temperature evaporator pressure is 100 kPa, and the condenser pressure is 1000 kPa. The intermediate pressure is optimum. Determine (a) the mass flow rate in the upper and lower stages, (b) the total input power for the compressors, and (c) the COP.
Transcribed Image Text:3. A two-stage cascade vapor-compression refrigeration system uses R-12 produces 15 tons of refrigeration. A direct-contact heat exchanger is the cascade condenser. The low temperature evaporator pressure is 100 kPa, and the condenser pressure is 1000 kPa. The intermediate pressure is optimum. Determine (a) the mass flow rate in the upper and lower stages, (b) the total input power for the compressors, and (c) the COP.
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