Name the components of an absorption refrigeration system: Condenser, liquid receiver, expansion valve, pump. In both systems the required refrigeration is provided by refrigerants vaporizing in the evaporator. Ammonia vapour is driven out of solution, C. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. 26°C DBT and 60% RH, A. Lithium Bromide Absorption Unit Water is used as a refrigerant in the lithium bromide absorption cycle. Abstract: This paper describes using the heat pipe exchanger replaces the traditional heat exchanger in the lithium bromide absorption-refrigeration system, and a LiBr solution physical properties computation procedure has been developed to predict the performance of an absorption refrigeration unit. C Ammonia is used as a refrigerant and lithium bromide as an absorbent. The objective of this paper is to develop a mathematical model for thermodynamic analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. A. Lithium bromide is used as a refrigerant and water as an absorbent. A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide or lithium chloride salt and water. Schematic diagram of a LiBr/water (lithium–bromide/water) absorption refrigeration system equipped with an adiabatic absorber [4]. These constraints were determined as the equivalence state of concentrations, the thermal unbalance between the system components of high-pressure condenser and low-pressure generator, … Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Such systems can cool the inlet air to 50°F (10°C). 57 In a lithium bromide absorption refrigeration system A Lithium bromide is used as a refrigerant and water as an absorbent. The concentration of Lithium Bromide in an absorption refrigerating system will change while a) Going through the expansion valve b) Going through the suction valve c) Cooling through the heat exchanger d) Absorbing water vapour in the absorber e) going through the discharge valve In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively . Electrolux refrigerator, A. @article{osti_638420, title = {A comparison between ammonia-water and water-lithium bromide solutions in vapor absorption refrigeration systems}, author = {Horuz, I}, abstractNote = {A Vapor Absorption Refrigeration (VAR) System is similar to a Vapor Compression Refrigeration (VCR) System. absorber, generators and an evaporator. D None of these. The water is absorbed by a lithium bromide/water solution. A. Water is used as a refrigerant and lithium bromide as an absorbent, C. Ammonia is used as a refrigerant and lithium bromide as an absorbent, In case of sensible heating of air, the coil efficiency is given by (where B.P.F. The lithium bromide absorption refrigeration system uses a solution of lithium bromide in water. Ammonia or water is used as the vapor in commercial absorption cycle systems, and water or lithium bromide is the absorber. 5. Lithium Bromide is more common because it is safer and non toxic, so we’ll look at how the water Lithium Bromide type chillers work. In a water-lithium bromide vapor absorption refrigeration system, water is used as the refrigerant while lithium bromide (Li Br) is used as the absorbent. A. Lithium bromide is used as a refrigerant and water as an absorbent, B. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°C The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. Instead they use water as the refrigerant, and this is mixed with either ammonia or Lithium Bromide. Other types of charts showing vapour pressure data for water-lithum bromide systems are also available in literature. 1.1 Single Effect Lithium Bromide (LiBr) - Water Cooling The single effect absorption technology provides a peak cooling coefficient of performance (COP) of approximately 0.7 and operates with heat input temperatures in the range of 80°C to 120°C. In a water-lithium bromide vapor absorption refrigeration system, water is used as the refrigerant while lithium bromide (Li Br) is used as the absorbent. In this study, the effects of critical operational constraints on the operational domain of a double-effect lithium bromide/water absorption refrigeration system and its performance were investigated. Water is used as a refrigerant and lithium bromide as an absorbent, C. A Water and water . Ammonia-absorption refrigeration cycle requires (a) very little work input (b) maximum work input (c) nearly same work input as for vapour compression cycle (d) zero work input (e) none of the above. Water-Lithium Bromide vapor absorption system Introduction • Vapor absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems • water is used as refrigerant and a solution of lithium bromide in water is used as absorbent • It is used only in applications requiring refrigeration at temperatures above 00C Cont… Lithium bromide mixes with ammonia, D. Most of the domestic refrigerators work on the following refrigeration system, In a lithium bromide absorption refrigeration system, The operating temperature of a cold storage is -2°C. 1.86 kW, B. This closing of valve will reduce the heat input to generator of absorption chillers and temperature in generator will be reduced. The lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. Chain Drives MCQ Practice Test: 1. = Bypass factor), The undesirable property of a refrigerant is, The desirable property of a refrigerant is, Related Questions on Refrigeration and Air Conditioning, More Related Questions on Refrigeration and Air Conditioning. Absorption systems typically employ lithium–bromide (Li–Br) and water, with the Li–Br being the absorber and the water acting as the refrigerant. 7.44 kW, D. Ammonia is used as a refrigerant and lithium bromide as an absorbent, D. B Water is used as a refrigerant and lithium bromide as an absorbent. Lithium bromide is used as a refrigerant and water as an absorbent, B. Water is used as a refrigerant and lithium bromide as an absorbent C. Ammonia is used as a refrigerant and lithium bromide as an absorbent D. None of the above. Water under low pressure is evaporated from the coils that are to be chilled. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Carnot cycle, D. In a lithium bromide absorption refrigeration system. it is having lot more of advantages like except for two small centrifugal pumps, there are no moving parts so less number of moving parts comprises of all the processes in the vapor compression refrigeration system like compression B Water and lithium bromide . A. Lithium bromide is used as a refrigerant and water as an absorbent B. Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. 20°C DBT and 50% RH, B. Figure 15.3 shows another chart wherein the mass fraction of lithium bromide is plotted on abscissa, while saturation It should be noted that the refrigerant in the water-lithium bromide system is water The working temperature of the generator, adiabatic absorber, condenser, evaporator, the cooling capacity of the system, and the The main aim of this work is to study of Lithium Bromide- Water (LiBr-H2O) absorption But as far as COP of these refrigeration systems is concerned, it System with the Capacity of 1.5 ton. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. In this system, water is being used as a refrigerant whereas lithium bromide, which is a highly hydroscopic salt, is used as an absorbent. The lithium-bromide absorption refrigeration system uses a solution of lithium bromide in water. In a water-lithium bromide vapor absorption refrigeration system, water is used as the refrigerant while lithium bromide (Li Br) is used as the absorbent. The … 18.6 kW, A. analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. 20°C DBT and 60% RH, D. The following are the two principles that form the basis for the lithium bromide absorption refrigeration cycle: 1. 14. the last 5 years. The Li-Br solution has a strong affinity for water vapour because of its very low vapour pressure. The actual C.O.P. To get more questions visit other sections. Answer: Option B 6. In that case absorption systems … An important characteristic of absorption system of refrigeration is (A) Noisy operation (B) ... Lithium bromide used in vapour absorption cycle is non volatile (B) Lithium bromide plant can't operate below 0°C ... Chain Drives Multiple Choice Questions and Answers. 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