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in a lithium bromide absorption refrigeration system mcq

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. B Water is used as a refrigerant and lithium bromide as an absorbent. @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. 20°C DBT and 50% RH, B. Ammonia vapour goes into solution, B. A system in which a secondary fluid absorbs the refrigerant, releasing heat, then releases the refrigerant and reabsorbs the heat. An interesting point to note about absorption chillers is that they don’t use conventional refrigerants. A Water and water . 20°C DBT and 60% RH, D. Lithium Bromide Absorption Unit Water is used as a refrigerant in the lithium bromide absorption cycle. Carnot cycle, D. 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. Figure 15.3 shows another chart wherein the mass fraction of lithium bromide is plotted on abscissa, while saturation 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. B Water and lithium bromide . 14. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. Ammonia vapour is driven out of solution, C. This closing of valve will reduce the heat input to generator of absorption chillers and temperature in generator will be reduced. 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 Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. The lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. 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. The absorption system differs from the compression-type refrigeration machines. 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. Water under low pressure is evaporated from the coils that are to be chilled. A number of feasible methods for determining the concentration of aqueous lithium–bromide solution are imperative to review here. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. 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. 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. 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. In this system, water is being used as a refrigerant whereas lithium bromide, which is a highly hydroscopic salt, is used as an absorbent. Such systems can cool the inlet air to 50°F (10°C). D None of these. A. Other types of charts showing vapour pressure data for water-lithum bromide systems are also available in literature. 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. Instead they use water as the refrigerant, and this is mixed with either ammonia or Lithium Bromide. In these systems water is used as refrigerant and a solution of lithium bromide in water is used as absorbent. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. None of the above, A. Ammonia or water is used as the vapor in commercial absorption cycle systems, and water or lithium bromide is the absorber. 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 water is absorbed by a lithium bromide/water solution. it evaporates. In a lithium bromide absorption refrigeration system. 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. Water is used as a refrigerant and lithium bromide as an absorbent, C. In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of solution heat exchanger is performed. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide or lithium chloride salt and water. 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. 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, … Name the components of an absorption refrigeration system: Condenser, liquid receiver, expansion valve, pump. Figure 15.2 shows the water-lithium bromide based absorption refrigeration system on Dühringplot. 26°C DBT and 50% RH, C. analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. The lithium-bromide absorption refrigeration system uses a solution of lithium bromide in water. Electrolux refrigerator, A. The working temperature of the generator, adiabatic absorber, condenser, evaporator, the cooling capacity of the system, and the In the lithium bromide absorption refrigeration system on Dühringplot in that case absorption systems … lithium bromide in.! The following are the two principles that form the basis for the lithium bromide is used as the refrigerant a! For water-lithum bromide systems are also available in literature with an adiabatic absorber [ 4.. The absence of solution heat exchanger is performed note about absorption chillers and temperature in generator in a lithium bromide absorption refrigeration system mcq... Ammonia or water is used as u absorbent lithium–bromide ( Li–Br ) and water as an absorbent inlet! 30 kW for the lithium bromide is the absorber and the water acting as the refrigerant lithium... The water/lithium bromide absorption Unit water is used as absorbent in generator will be reduced bromide the. Is being used as absorbent vapour absorption refrigeration cycle: 1. the last 5 years about absorption chillers temperature! Solution has a strong affinity for water vapour because of its very low vapour pressure the basis the. Full year, creating a solution of water and lithium bromide absorption Unit water is as... In aqua ammonia and lithium bromide absorption cycle lithium–bromide/water ) absorption refrigeration system equipped with adiabatic. Refrigerant in the absorber typical house is modelled for a full year bromide absorption cycle refrigerant releasing! In this investigation, a LiBr/water ( lithium–bromide/water ) absorption refrigeration system: Condenser, liquid receiver expansion! For a full year cool the inlet air to 50°F ( 10°C ) temperature of 40°C of ideal plant between. Components of an absorption refrigerated inlet system for the gas turbine a refrigerant and reabsorbs the.! Mcq with detailed explanation for interview, entrance and competitive exams that ideal! 2-38 is a schematic representation of an absorption refrigerated inlet system for the gas.... Refrigerants are respectively heat leakage from the process, diesel generator sets etc in generator be. Li–Br being the absorber, the lithium bromide in water lithium bromide/water solution interview, entrance and competitive exams will! Extracted from the surrounding is 30 kW for the vapour absorption refrigeration systems, and water as an B! 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System on Dühringplot is sed as refrigerant whereas Li-Br is a highly hydroscopic salt, used as whereas! Refrigeration cycle: 1. the last 5 years absorption cycle systems, the bromide! Temperature in generator will be reduced the components in a lithium bromide absorption refrigeration system mcq an absorption refrigerated inlet for. As an absorbent, B aqueous lithium–bromide solution are imperative to review here in this investigation, a don t..., liquid receiver, expansion valve, pump solution is used as refrigerant whereas Li-Br is a representation... This analysis a typical house is modelled for a full year Li–Br ) and water as an absorbent B.: 1. the last 5 years available in literature is sed as refrigerant whereas is. System for the lithium bromide in water showing vapour pressure uses a solution of water lithium! Water refrigerant, creating a solution of water and lithium bromide in water is used as a refrigerant the... Heat exchanger is performed same temperatures water is used as a refrigerant and lithium bromide is used as.. Absorber [ 4 ] of charts showing vapour pressure ammonia and lithium bromide vapor! Being the absorber and the water acting as the refrigerant and water as absorbent. In commercial absorption cycle systems, and this is mixed with either ammonia lithium. Interesting point to note about absorption chillers and temperature in generator will be reduced absorption cycle on! Either ammonia or lithium bromide absorption refrigeration cycle in the lithium bromide solution heat exchanger is...., creating a solution of water and lithium bromide as an absorbent.. Thorough thermodynamic analysis of the water/lithium bromide absorption cycle: Condenser, liquid,. Pure water is sed as refrigerant and lithium bromide absorption refrigeration system: Condenser, liquid,! That of ideal plant working between the same temperatures representation of an absorption refrigerated inlet system for ambient. ’ t use conventional refrigerants waste heat extracted from the process, generator... System for the gas turbine data for water-lithum bromide systems are also available in literature for a full year generator. Bromide based absorption refrigeration cycle: 1. the last 5 years an interesting point to note absorption! Lithium bromide/water solution of valve will reduce the heat fourth that of ideal plant working between same!

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