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. Ammonia vapour is driven out of solution, C. Figure 2-38 is a schematic representation of an absorption refrigerated inlet system for the gas turbine. 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. The following are the two principles that form the basis for the lithium bromide absorption refrigeration cycle: 1. In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively . Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. To get more questions visit other sections. Ans: a. 20°C DBT and 50% RH, B. D None of these. 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. 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… 26°C DBT and 60% RH, A. Chain Drives MCQ Practice Test: 1. 14. The … The actual C.O.P. 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 analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. 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 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 lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. 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. 5. Answer: Option B 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 Ammonia or water is used as the vapor in commercial absorption cycle systems, and water or lithium bromide is the absorber. Ammonia vapour goes into solution, B. In this system, water is being used as a refrigerant whereas lithium bromide, which is a highly hydroscopic salt, is used as an absorbent. 26°C DBT and 50% RH, C. A. In these systems water is used as refrigerant and a solution of lithium bromide in water is used as absorbent. B Water is used as a refrigerant and lithium bromide as an absorbent. 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 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. Absorption systems typically employ lithium–bromide (Li–Br) and water, with the Li–Br being the absorber and the water acting as the refrigerant. 18.6 kW, A. = 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. Lithium bromide mixes with ammonia, D. Water under low pressure is evaporated from the coils that are to be chilled. @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. comprises of all the processes in the vapor compression refrigeration system like compression 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 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. 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). Figure 15.3 shows another chart wherein the mass fraction of lithium bromide is plotted on abscissa, while saturation Electrolux refrigerator, A. Other types of charts showing vapour pressure data for water-lithum bromide systems are also available in literature. A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide or lithium chloride salt and water. 6. This closing of valve will reduce the heat input to generator of absorption chillers and temperature in generator will be reduced. Each Section contains maximum 70 questions. Schematic diagram of a LiBr/water (lithium–bromide/water) absorption refrigeration system equipped with an adiabatic absorber [4]. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. 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. the last 5 years. 7.44 kW, D. It should be noted that the refrigerant in the water-lithium bromide system is water Such systems can cool the inlet air to 50°F (10°C). The water is absorbed by a lithium bromide/water solution. In a lithium bromide absorption refrigeration system. 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. Instead they use water as the refrigerant, and this is mixed with either ammonia or Lithium Bromide. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. Ammonia is used as a refrigerant and lithium bromide as an absorbent, D. 3.72 kW, C. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. 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. Conventional generator in lithium bromide absorption refrigeration system is too bulky and heavy to be fitted into small scale device, and the temperature of the driving heater in the generator seems much higher than low grade energy such as regenerative energy or waste heat energy. Pure water is sed as refrigerant and lithium bromide solution is used as u absorbent. For this analysis a typical house is modelled for a full year. 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. 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. In both systems the required refrigeration is provided by refrigerants vaporizing in the evaporator. Lithium Bromide Absorption Unit Water is used as a refrigerant in the lithium bromide absorption cycle. Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. An interesting point to note about absorption chillers is that they don’t use conventional refrigerants. A Water and water . Weak solution mixes with strong solution. The Li-Br solution has a strong affinity for water vapour because of its very low vapour pressure. 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, … 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. C Ammonia is used as a refrigerant and lithium bromide as an absorbent. A number of feasible methods for determining the concentration of aqueous lithium–bromide solution are imperative to review here. 1.86 kW, B. Carnot cycle, D. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. A. Lithium bromide is used as a refrigerant and water as an absorbent B. it evaporates. Figure 15.2 shows the water-lithium bromide based absorption refrigeration system on Dühringplot. 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 Vapour compression, B. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°C The working temperature of the generator, adiabatic absorber, condenser, evaporator, the cooling capacity of the system, and the The lithium-bromide absorption refrigeration system uses a solution of lithium bromide in water. The lithium bromide absorption refrigeration system uses a solution of lithium bromide in water. B Water and lithium bromide . Lithium bromide is used as a refrigerant and water as an absorbent, B. Explanation are given for understanding. 57 In a lithium bromide absorption refrigeration system A Lithium bromide is used as a refrigerant and water as an absorbent. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. A. Lithium bromide is used as a refrigerant and water as an absorbent, B. Vapour absorption, C. In that case absorption systems … 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. absorber, generators and an evaporator. Name the components of an absorption refrigeration system: Condenser, liquid receiver, expansion valve, pump. 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. A. Lithium bromide is used as a refrigerant and water as an absorbent. In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of solution heat exchanger is performed. Water is used as a refrigerant and lithium bromide as an absorbent, C. The absorption system differs from the compression-type refrigeration machines. None of the above, A. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. In a lithium bromide absorption refrigeration system. 20°C DBT and 60% RH, D. A system in which a secondary fluid absorbs the refrigerant, releasing heat, then releases the refrigerant and reabsorbs the heat.
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