Each Section contains maximum 70 questions. The Li-Br solution has a strong affinity for water vapour because of its very low vapour pressure. 7.44 kW, D. 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. 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. In a lithium bromide absorption refrigeration system. Answer: Option B 3.72 kW, C. Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of solution heat exchanger is performed. 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 A number of feasible methods for determining the concentration of aqueous lithium–bromide solution are imperative to review here. D None of these. 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. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. 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 The lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. Ammonia or water is used as the vapor in commercial absorption cycle systems, and water or lithium bromide is the absorber. In this system, water is being used as a refrigerant whereas lithium bromide, which is a highly hydroscopic salt, is used as an absorbent. Absorption systems typically employ lithium–bromide (Li–Br) and water, with the Li–Br being the absorber and the water acting as the refrigerant. analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. Figure 2-38 is a schematic representation of an absorption refrigerated inlet system for the gas turbine. It should be noted that the refrigerant in the water-lithium bromide system is water Pure water is sed as refrigerant and lithium bromide solution is used as u absorbent. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. Vapour absorption, 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. 1.86 kW, B. the last 5 years. In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively . The actual C.O.P. = 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. 57 In a lithium bromide absorption refrigeration system A Lithium bromide is used as a refrigerant and water as an 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. The water is absorbed by a lithium bromide/water solution. B Water is used as a refrigerant and lithium bromide as an absorbent. In that case absorption systems … Name the components of an absorption refrigeration system: Condenser, liquid receiver, expansion valve, pump. Such systems can cool the inlet air to 50°F (10°C). Weak solution mixes with strong solution. Ammonia vapour is driven out of solution, C. 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. None of the above, A. absorber, generators and an evaporator. 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. An interesting point to note about absorption chillers is that they don’t use conventional refrigerants. 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) ... 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. For this analysis a typical house is modelled for a full year. Ammonia is used as a refrigerant and lithium bromide as an absorbent, D. 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, … Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. In a lithium bromide absorption refrigeration system. Vapour compression, B. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°C 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. B Water and lithium bromide . 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). A. Lithium bromide is used as a refrigerant and water as an absorbent. Other types of charts showing vapour pressure data for water-lithum bromide systems are also available in literature. 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 14. In these systems water is used as refrigerant and a solution of lithium bromide in water is used as absorbent. Instead they use water as the refrigerant, and this is mixed with either ammonia or Lithium Bromide. The absorption system differs from the compression-type refrigeration machines. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. Explanation are given for understanding. A Water and water . 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. 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. 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. 18.6 kW, A. 26°C DBT and 60% RH, A. 26°C DBT and 50% RH, C. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. Ammonia vapour goes into solution, B. Electrolux refrigerator, A. 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