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In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant enters the condenser at 16 bar and 160°C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the refrigerating

In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant enters the condenser at 16 bar and 160°C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the refrigerating

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 10.21 In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant enters the condenser at 16 bar and 160°C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the refrigerating capacity is 150 kW, determine (a) the mass flow rate of the refrigerant, in kg/s. (b) the power input to the compressor, in kW. (c) the coefficient of performance. (d) the isentropic compressor efficiency. (e) the rate of entropy production, in kW/K, for the compressor. Known: Ammonia is the working fluid in a vapor-compression refrigeration system. Data are known at various locations and the refrigerating capacity is given. Find: Determine (a) the mass flow rate of the refrigerant, (b) the compressor power, (c) the coefficient of performance, (d) the isentropic compressor efficiency, and (e) the rate of entropy production for the compressor. Schematic and Known Data: T 160 C -22 C 3 A 16 bar S Qu Condenser 16 bar Expansion Valve 160 C Compressor Engineering model: Q = 150 kW (1) Each component of the cycle is analyzed as a control volume at steady state. (2) There are no pressure drops through the evaporator and condenser. (3) The compressor operates adiabatically. The expansion through the valve is a throttling process. (4) Kinetic and potential energy effects are negligible. T¹=-22 C 1 Sat. Vapor
Transcribed Image Text:Problem 10.21 In a vapor-compression refrigeration cycle, ammonia exits the evaporator as saturated vapor at -22°C. The refrigerant enters the condenser at 16 bar and 160°C, and saturated liquid exits at 16 bar. There is no significant heat transfer between the compressor and its surroundings, and the refrigerant passes through the evaporator with a negligible change in pressure. If the refrigerating capacity is 150 kW, determine (a) the mass flow rate of the refrigerant, in kg/s. (b) the power input to the compressor, in kW. (c) the coefficient of performance. (d) the isentropic compressor efficiency. (e) the rate of entropy production, in kW/K, for the compressor. Known: Ammonia is the working fluid in a vapor-compression refrigeration system. Data are known at various locations and the refrigerating capacity is given. Find: Determine (a) the mass flow rate of the refrigerant, (b) the compressor power, (c) the coefficient of performance, (d) the isentropic compressor efficiency, and (e) the rate of entropy production for the compressor. Schematic and Known Data: T 160 C -22 C 3 A 16 bar S Qu Condenser 16 bar Expansion Valve 160 C Compressor Engineering model: Q = 150 kW (1) Each component of the cycle is analyzed as a control volume at steady state. (2) There are no pressure drops through the evaporator and condenser. (3) The compressor operates adiabatically. The expansion through the valve is a throttling process. (4) Kinetic and potential energy effects are negligible. T¹=-22 C 1 Sat. Vapor
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