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8. A refrigeration system has a capacity of 120 kW when operating between condenser saturation temperature of 30 °C and evaporator saturation temperature of 3 °C. A vapour-absorption cycle is used with water as refrigerant and lithium bromide as absorbent. The generator is maintained at 90 °C using a supply of waste heat from hot gases, and the absorber is at 25 °C. The solution (no subje stefan254. CHAPTER 2. VAPOUR COMPRESSION CYCLES 63 leaving the absorber is saturated at the evaporator pressure, and the solution entering and leaving the generator is saturated at the condenser pressure. There is no undercooling in the condenser and dry saturated vapour leaves the evaporator. There is a heat exchanger between absorber and the generator. Assuming that the enthalpy of super heated steam at low pressures maybe taken as approximately equal to the saturated value at the same temperature, and neglecting pump work and all pressures and heat losses, determine the: (i) Mass flow rate of water through the evaporator (ii) Heat supplied in the generator (ii) Heat rejected in the absorber (iv) Coefficient of performance of the refrigerator (v) Specific enthalpy of the solution entering the absorber.

8. A refrigeration system has a capacity of 120 kW when operating between condenser saturation temperature of 30 °C and evaporator saturation temperature of 3 °C. A vapour-absorption cycle is used with water as refrigerant and lithium bromide as absorbent. The generator is maintained at 90 °C using a supply of waste heat from hot gases, and the absorber is at 25 °C. The solution (no subje stefan254. CHAPTER 2. VAPOUR COMPRESSION CYCLES 63 leaving the absorber is saturated at the evaporator pressure, and the solution entering and leaving the generator is saturated at the condenser pressure. There is no undercooling in the condenser and dry saturated vapour leaves the evaporator. There is a heat exchanger between absorber and the generator. Assuming that the enthalpy of super heated steam at low pressures maybe taken as approximately equal to the saturated value at the same temperature, and neglecting pump work and all pressures and heat losses, determine the: (i) Mass flow rate of water through the evaporator (ii) Heat supplied in the generator (ii) Heat rejected in the absorber (iv) Coefficient of performance of the refrigerator (v) Specific enthalpy of the solution entering the absorber.

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
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8. A refrigeration system has a capacity of 120 kW when operating between condenser saturation temperature of 30 °C and evaporator saturation temperature of 3 °C. A vapour-absorption cycle is used with water as refrigerant and lithium bromide as absorbent. The generator is maintained at 90 °C using a supply of waste heat from hot gases, and the absorber is at 25 °C. The solution (no subje stefan254. CHAPTER 2. VAPOUR COMPRESSION CYCLES 63 leaving the absorber is saturated at the evaporator pressure, and the solution entering and leaving the generator is saturated at the condenser pressure. There is no undercooling in the condenser and dry saturated vapour leaves the evaporator. There is a heat exchanger between absorber and the generator. Assuming that the enthalpy of super heated steam at low pressures maybe taken as approximately equal to the saturated value at the same temperature, and neglecting pump work and all pressures and heat losses, determine the: (i) Mass flow rate of water through the evaporator (ii) Heat supplied in the generator (ii) Heat rejected in the absorber (iv) Coefficient of performance of the refrigerator (v) Specific enthalpy of the solution entering the absorber.
Transcribed Image Text:8. A refrigeration system has a capacity of 120 kW when operating between condenser saturation temperature of 30 °C and evaporator saturation temperature of 3 °C. A vapour-absorption cycle is used with water as refrigerant and lithium bromide as absorbent. The generator is maintained at 90 °C using a supply of waste heat from hot gases, and the absorber is at 25 °C. The solution (no subje stefan254. CHAPTER 2. VAPOUR COMPRESSION CYCLES 63 leaving the absorber is saturated at the evaporator pressure, and the solution entering and leaving the generator is saturated at the condenser pressure. There is no undercooling in the condenser and dry saturated vapour leaves the evaporator. There is a heat exchanger between absorber and the generator. Assuming that the enthalpy of super heated steam at low pressures maybe taken as approximately equal to the saturated value at the same temperature, and neglecting pump work and all pressures and heat losses, determine the: (i) Mass flow rate of water through the evaporator (ii) Heat supplied in the generator (ii) Heat rejected in the absorber (iv) Coefficient of performance of the refrigerator (v) Specific enthalpy of the solution entering the absorber.
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