Weak solution mixes with strong solution. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°C of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. Explanation are given for understanding. Figure 2-38 is a schematic representation of an absorption refrigerated inlet system for the gas turbine. Carnot cycle, D. Ans: a. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. 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. 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 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. Vapour compression, B. it evaporates. 3.72 kW, C. B Water is used as a refrigerant and lithium bromide 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 Figure 15.2 shows the water-lithium bromide based absorption refrigeration system on Dühringplot. This closing of valve will reduce the heat input to generator of absorption chillers and temperature in generator will be reduced. A. Lithium bromide is used as a refrigerant and water as an absorbent. D None of these. = 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. 26°C DBT and 60% RH, A. 5. 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, … The working temperature of the generator, adiabatic absorber, condenser, evaporator, the cooling capacity of the system, and the comprises of all the processes in the vapor compression refrigeration system like compression 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. Instead they use water as the refrigerant, and this is mixed with either ammonia or Lithium Bromide. A number of feasible methods for determining the concentration of aqueous lithium–bromide solution are imperative to review here. Each Section contains maximum 70 questions. 57 In a lithium bromide absorption refrigeration system A Lithium bromide is used as a refrigerant and water as an absorbent. Answer: Option B C Ammonia is used as a refrigerant and lithium bromide as an 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. 6. In both systems the required refrigeration is provided by refrigerants vaporizing in the evaporator. 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. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. 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 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. Electrolux refrigerator, A. Lithium Bromide Absorption Unit Water is used as a refrigerant in the lithium bromide absorption cycle. For this analysis a typical house is modelled for a full year. Lithium bromide is used as a refrigerant and water as an absorbent, B. A. Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. Vapour absorption, C. Absorption systems typically employ lithium–bromide (Li–Br) and water, with the Li–Br being the absorber and the water acting as the refrigerant. The lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. 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. 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. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. The water is absorbed by a lithium bromide/water solution. 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… 14. @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. A. Lithium bromide is used as a refrigerant and water as an absorbent B. 18.6 kW, A. None of the above, A. 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. absorber, generators and an evaporator. 26°C DBT and 50% RH, C. Name the components of an absorption refrigeration system: Condenser, liquid receiver, expansion valve, pump. In a lithium bromide absorption refrigeration system. Water is used as a refrigerant and lithium bromide as an absorbent, C. 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. 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. Chain Drives MCQ Practice Test: 1. 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 Water under low pressure is evaporated from the coils that are to be chilled. In a lithium bromide absorption refrigeration system. The … Ammonia vapour goes into solution, B. Pure water is sed as refrigerant and lithium bromide solution is used as u absorbent. 20°C DBT and 50% RH, B. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. 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 that case absorption systems … The absorption system differs from the compression-type refrigeration machines. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. To get more questions visit other sections. 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). Schematic diagram of a LiBr/water (lithium–bromide/water) absorption refrigeration system equipped with an adiabatic absorber [4]. 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 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. 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