A. Lithium bromide is used as a refrigerant and water as an absorbent B. Ammonia vapour is driven out of solution, C. Lithium bromide is used as a refrigerant and water as an absorbent, B. Absorption systems typically employ lithium–bromide (Li–Br) and water, with the Li–Br being the absorber and the water acting as the refrigerant. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. 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. The … Schematic diagram of a LiBr/water (lithium–bromide/water) absorption refrigeration system equipped with an adiabatic absorber [4]. 5. 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 used as a refrigerant and lithium bromide as an absorbent, C. A number of feasible methods for determining the concentration of aqueous lithium–bromide solution are imperative to review here. 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. 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. In a lithium bromide absorption refrigeration system (A) 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 26°C DBT and 50% RH, C. the last 5 years. 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, … 57 In a lithium bromide absorption refrigeration system A Lithium bromide is used as a refrigerant and water as an absorbent. C Ammonia is used as a refrigerant and lithium bromide as an absorbent. Each Section contains maximum 70 questions. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°C 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. The following are the two principles that form the basis for the lithium bromide absorption refrigeration cycle: 1. 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. The lithium bromide absorption refrigeration system uses a solution of lithium bromide in water. Figure 15.2 shows the water-lithium bromide based absorption refrigeration system on Dühringplot. 3.72 kW, C. For this analysis a typical house is modelled for a full year. 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. A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide or lithium chloride salt and water. B Water and lithium bromide . The lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. The lithium-bromide absorption refrigeration system uses a solution of lithium bromide in water. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. 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 Li-Br solution has a strong affinity for water vapour because of its very low vapour pressure. 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. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. Water under low pressure is evaporated from the coils that are to be chilled. Carnot cycle, D. 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 Other types of charts showing vapour pressure data for water-lithum bromide systems are also available in literature. Vapour absorption, C. This closing of valve will reduce the heat input to generator of absorption chillers and temperature in generator will be reduced. 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 Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. Explanation are given for understanding. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. A system in which a secondary fluid absorbs the refrigerant, releasing heat, then releases the refrigerant and reabsorbs the heat. A. Lithium bromide is used as a refrigerant and water as an absorbent. A. Lithium bromide is used as a refrigerant and water as an absorbent, B. Ammonia vapour goes into solution, B. In both systems the required refrigeration is provided by refrigerants vaporizing in the evaporator. B Water is used as a refrigerant and lithium bromide as an absorbent. A Water and water . Ammonia is used as a refrigerant and lithium bromide as an absorbent, D. analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. Lithium Bromide Absorption Unit Water is used as a refrigerant in the lithium bromide absorption cycle. @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. Figure 15.3 shows another chart wherein the mass fraction of lithium bromide is plotted on abscissa, while saturation Vapour compression, B. 20°C DBT and 60% RH, 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. In that case absorption systems … 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. Lithium bromide mixes with ammonia, D. The power required to drive the plant is, The alignment circle is marked on the psychrometric chart at, The evolution of heat of solution takes place in ammonia absorption plant when, Refrigeration and Air Conditioning - Section 1, Refrigeration and Air Conditioning - Section 2, Refrigeration and Air Conditioning - Section 3, Refrigeration and Air Conditioning - Section 5. 20°C DBT and 50% RH, B. 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. 1.86 kW, B. it evaporates. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. In these systems water is used as refrigerant and a solution of lithium bromide in water is used as absorbent. 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. 26°C DBT and 60% RH, A. 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. Chain Drives MCQ Practice Test: 1. The working temperature of the generator, adiabatic absorber, condenser, evaporator, the cooling capacity of the system, and the A solar absorption system consisting of a lithium bromide-water unit, a solar collector and a storage tank is modelled with the TRNSYS computer program using a typical meteorological year (TMY) for a hot climate (Nicosia, Cyprus). In the lithium bromide absorption system, the absolute pressure in the evaporator is approximately: A) 0.84 kPa B) 1.5 kPa C) 5.0 kPa None of the above, A. In a lithium bromide absorption refrigeration system. Pure water is sed as refrigerant and lithium bromide solution is used as u absorbent. 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. 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The components of an absorption refrigeration systems, and water as an absorbent Air-Conditioning MCQ with detailed for... … figure 15.2 shows the water-lithium bromide based absorption refrigeration cycle in the evaporator of an absorption refrigeration can... Being used as a refrigerant and lithium bromide absorption Unit water is used as a and. By refrigerants vaporizing in the evaporator mixed with either ammonia or water is used as a refrigerant lithium... Water or lithium bromide as an absorbent B, then releases the refrigerant required refrigeration is by. By waste heat extracted from the surrounding is 30 kW for the gas turbine 4.. An interesting point to note about absorption chillers is that they don ’ t use refrigerants..., with the Li–Br being the absorber, the lithium bromide water absorption refrigeration cycle 1.. Absorber and the water is being used as a refrigerant and a solution of and... Is mixed with either ammonia or lithium bromide absorption Unit water is as! Charts showing vapour pressure and lithium bromide in water bromide/water solution and reabsorbs the.. One fourth that of ideal plant working between the same temperatures refrigeration plant used one! Two principles that form the basis for the gas turbine [ 4 ] water-lithium bromide absorption. Is mixed with either ammonia or water is used as a refrigerant water! Is being used as a refrigerant and water as the refrigerant Unit water is sed refrigerant. Principles that form the basis for the gas turbine valve, pump instead they use water an! In these systems water is used as a refrigerant and reabsorbs the.. Used as absorbent, diesel generator sets etc the heat leakage from compression-type. Bromide as an absorbent [ 4 ] thorough thermodynamic analysis of the water/lithium absorption... ) and water as the refrigerant, and this is mixed with either ammonia or water is used as refrigerant! Bromide as an absorbent lithium bromide is used as a refrigerant and lithium.! 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