A refrigerating system using R- 134a has a load of 20 kW. Limits of operating pressures are 750 kPa and 150 kPa. The vapor refrigerant exits the evaporator with a 5-degree superheat and exits the compressor discharge at 750 KPa and 60°C. The liquid refrigerant enters the expansion valve at 25°C. Calculate the COP of the system.

A refrigerating system using R- 134a has a load of 20 kW. Limits of operating pressures are 750 kPa and 150 kPa. The vapor refrigerant exits the evaporator with a 5-degree superheat and exits the compressor discharge at 750 KPa and 60°C. The liquid refrigerant enters the expansion valve at 25°C. Calculate the COP of the system.

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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