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To achieve cooling to a lower temperature on an industrial scale, a cascade refrigeration system like the one shown below employs two vapor-compression refrigeration cycles. The low- temperature cycle (B) uses ammonia to remove heat from a cold space at a rate of 0.5 kg/s. Saturated vapor enters the compressor at -40 °C, and exits the condenser as a saturated liquid at 0.5 MPa. Condenser Compressar A Valve Heat Exchanger Valve Compressar Evaperator Heat is released from the low-temperature cycle to the high-temperature cycle using an interconnected heat exchanger. The high-temperature cycle (A) uses refrigerant 134a, with saturated vapor entering its compressor at 0.24 MPa and exiting the condenser as a saturated liquid at 1 MPa. The isentropic efficiency of each compressor is 0.78. Determine the mass flow rate of the refrigerant 134a, and the overall coefficient of performance of the cycle.

To achieve cooling to a lower temperature on an industrial scale, a cascade refrigeration system like the one shown below employs two vapor-compression refrigeration cycles. The low- temperature cycle (B) uses ammonia to remove heat from a cold space at a rate of 0.5 kg/s. Saturated vapor enters the compressor at -40 °C, and exits the condenser as a saturated liquid at 0.5 MPa. Condenser Compressar A Valve Heat Exchanger Valve Compressar Evaperator Heat is released from the low-temperature cycle to the high-temperature cycle using an interconnected heat exchanger. The high-temperature cycle (A) uses refrigerant 134a, with saturated vapor entering its compressor at 0.24 MPa and exiting the condenser as a saturated liquid at 1 MPa. The isentropic efficiency of each compressor is 0.78. Determine the mass flow rate of the refrigerant 134a, and the overall coefficient of performance of the cycle.

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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To achieve cooling to a lower temperature on an industrial scale, a cascade refrigeration system like the one shown below employs two vapor-compression refrigeration cycles. The low- temperature cycle (B) uses ammonia to remove heat from a cold space at a rate of 0.5 kg/s. Saturated vapor enters the compressor at -40 °C, and exits the condenser as a saturated liquid at 0.5 MPa. Condenser Compressor Valve Heat Exchanger Valve Compressor Evaporator Heat is released from the low-temperature cycle to the high-temperature cycle using an interconnected heat exchanger. The high-temperature cycle (A) uses refrigerant 134a, with saturated vapor entering its compressor at 0.24 MPa and exiting the condenser as a saturated liquid at 1 MPa. The isentropic efficiency of each compressor is 0.78. Determine the mass flow rate of the refrigerant 134a, and the overall coefficient of performance of the cycle.
Transcribed Image Text:To achieve cooling to a lower temperature on an industrial scale, a cascade refrigeration system like the one shown below employs two vapor-compression refrigeration cycles. The low- temperature cycle (B) uses ammonia to remove heat from a cold space at a rate of 0.5 kg/s. Saturated vapor enters the compressor at -40 °C, and exits the condenser as a saturated liquid at 0.5 MPa. Condenser Compressor Valve Heat Exchanger Valve Compressor Evaporator Heat is released from the low-temperature cycle to the high-temperature cycle using an interconnected heat exchanger. The high-temperature cycle (A) uses refrigerant 134a, with saturated vapor entering its compressor at 0.24 MPa and exiting the condenser as a saturated liquid at 1 MPa. The isentropic efficiency of each compressor is 0.78. Determine the mass flow rate of the refrigerant 134a, and the overall coefficient of performance of the cycle.
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