A cascade refrigeration system uses R22 in the low temp unit and R12 in the high temp unit. The system develops 30 kW of refrigeration at -40C. The R12 system operates at -10C evaporating temp and 38C condensing temp. There is a 10 degree overlap of temperatures in the cascade condenser. Calculate the (a) mass flow rate of R22, (b) mass flow rate of R12, (c) the power required by R22 compressor, and the power required by R12 compressor.

A cascade refrigeration system uses R22 in the low temp unit and R12 in the high temp unit. The system develops 30 kW of refrigeration at -40C. The R12 system operates at -10C evaporating temp and 38C condensing temp. There is a 10 degree overlap of temperatures in the cascade condenser. Calculate the (a) mass flow rate of R22, (b) mass flow rate of R12, (c) the power required by R22 compressor, and the power required by R12 compressor.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems

Section: Chapter Questions

Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....

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