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Working fluid is Refrigerant 134a. Vapor-compression refrigeration system has refrigerating capacity = 1650 Btu/hour. Refrigerant enters evaporator at -10F and leaves at 15F. Isentropic compressor efficiency = 74%. Refrigerant condenses at 140F and leaves condenser subcooled at 100F. No large pressure drops through evaporator and condenser. DETERMINE: 1. Pressure of evaporator in lbf/in^2 2. Pressure of condenser in lbf/in^2 3. Mass flow rate in lb/s of refrigerant 134a. 4. Power input in horsepower of compressor. 5. Coefficient of performance.

Working fluid is Refrigerant 134a. Vapor-compression refrigeration system has refrigerating capacity = 1650 Btu/hour. Refrigerant enters evaporator at -10F and leaves at 15F. Isentropic compressor efficiency = 74%. Refrigerant condenses at 140F and leaves condenser subcooled at 100F. No large pressure drops through evaporator and condenser. DETERMINE: 1. Pressure of evaporator in lbf/in^2 2. Pressure of condenser in lbf/in^2 3. Mass flow rate in lb/s of refrigerant 134a. 4. Power input in horsepower of compressor. 5. Coefficient of performance.

Refrigeration and Air Conditioning Technology (MindTap Course List)
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 5RQ
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**Refrigeration System Analysis** **Working fluid:** Refrigerant 134a. **System Details:** - Vapor-compression refrigeration system with a refrigerating capacity of 1650 Btu/hour. - Refrigerant enters the evaporator at -10°F and exits at 15°F. - Isentropic compressor efficiency is 74%. - The refrigerant condenses at 140°F, leaving the condenser subcooled at 100°F. - No large pressure drops through the evaporator and condenser. **Tasks to Determine:** 1. **Pressure of the evaporator** in lbf/in² (pounds-force per square inch). 2. **Pressure of the condenser** in lbf/in². 3. **Mass flow rate** in lb/s (pounds per second) of refrigerant 134a. 4. **Power input** in horsepower for the compressor. 5. **Coefficient of performance** for the system.
Transcribed Image Text:**Refrigeration System Analysis** **Working fluid:** Refrigerant 134a. **System Details:** - Vapor-compression refrigeration system with a refrigerating capacity of 1650 Btu/hour. - Refrigerant enters the evaporator at -10°F and exits at 15°F. - Isentropic compressor efficiency is 74%. - The refrigerant condenses at 140°F, leaving the condenser subcooled at 100°F. - No large pressure drops through the evaporator and condenser. **Tasks to Determine:** 1. **Pressure of the evaporator** in lbf/in² (pounds-force per square inch). 2. **Pressure of the condenser** in lbf/in². 3. **Mass flow rate** in lb/s (pounds per second) of refrigerant 134a. 4. **Power input** in horsepower for the compressor. 5. **Coefficient of performance** for the system.
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