*1. A cascade refrigerationsystem using R - 22 in the low- temperature circuit andammonia (R - 717) in the high- temperature circuit has aload of 150 kW. The low -temperature circuit operatesat an evaporatingtemperature of -50°C and acondensing pressure of 500kPa. Refrigerant leaves thelow temperature evaporatoras saturated vapor and entersthe suction of the low -mperature compressor at -45°C. Liquid refrigerant exitsthe condenser at 02°C. Thehigh temperature circuitoperates at an evaporatingtemperature of -10°C and acondensing pressure of 1200kPa. The refrigerant exits bothevaporator and condenser atsaturated conditions.Calculate the power input tothe low-temperature circuitcompressor, kW.

Answered: Image /qna-images/answer/54ea786b-770d-4fa5-90c8-dd51c017e8c8.jpg

1. A cascade refrigeration * system using R-22 in the low - temperature circuit and ammonia (R-717) in the high - temperature circuit has a load of 150 kW. The low - temperature circuit operates at an evaporating temperature of -50°C and a condensing pressure of 500 kPa. Refrigerant leaves the low temperature evaporator as saturated vapor and enters the suction of the low - temperature compressor at - 45°C. Liquid refrigerant exits the condenser at 02°C. The high temperature circuit operates at an evaporating temperature of -10°C and a condensing pressure of 1200 kPa. The refrigerant exits both evaporator and condenser at saturated conditions. Calculate the power input to the low - temperature circuit compressor, kW.

1. A cascade refrigeration * system using R-22 in the low - temperature circuit and ammonia (R-717) in the high - temperature circuit has a load of 150 kW. The low - temperature circuit operates at an evaporating temperature of -50°C and a condensing pressure of 500 kPa. Refrigerant leaves the low temperature evaporator as saturated vapor and enters the suction of the low - temperature compressor at - 45°C. Liquid refrigerant exits the condenser at 02°C. The high temperature circuit operates at an evaporating temperature of -10°C and a condensing pressure of 1200 kPa. The refrigerant exits both evaporator and condenser at saturated conditions. Calculate the power input to the low - temperature circuit compressor, kW.

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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