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Problem 2 - R-134a commercial refrigerator with a water cooled condenser A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine: The mass flow rate of the refrigerant. The refrigeration load (heat rate removed from the cold space). The COP of this refrigerator. The minimum power input to the compressor for the same refrigeration load. Hint: Carnot refrigerator.

Problem 2 - R-134a commercial refrigerator with a water cooled condenser A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine: The mass flow rate of the refrigerant. The refrigeration load (heat rate removed from the cold space). The COP of this refrigerator. The minimum power input to the compressor for the same refrigeration load. Hint: Carnot refrigerator.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Problem 2- R-134a commercial refrigerator with a water cooled condenser A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine: The mass flow rate of the refrigerant. The refrigeration load (heat rate removed from the cold space). The COP of this refrigerator. The minimum power input to the compressor for the same refrigeration load. Hint: Carnot refrigerator. 26°C 1.2 MPa 5°C subcooled fo Expansion valve Condenser Evaporator Q₁ Water 18°C 1.2 MPa 50°C Compressor Win
Transcribed Image Text:Problem 2- R-134a commercial refrigerator with a water cooled condenser A commercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°C by rejecting waste heat to cooling water that enters the condenser at 18°C at a rate of 0.25 kg/s and leaves at 26°C. The refrigerant enters the condenser at 1.2 MPa and 50°C and leaves at the same pressure subcooled by 5°C. If the compressor consumes 3.3 kW of power, determine: The mass flow rate of the refrigerant. The refrigeration load (heat rate removed from the cold space). The COP of this refrigerator. The minimum power input to the compressor for the same refrigeration load. Hint: Carnot refrigerator. 26°C 1.2 MPa 5°C subcooled fo Expansion valve Condenser Evaporator Q₁ Water 18°C 1.2 MPa 50°C Compressor Win
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