it evaporates. absorber, generators and an evaporator. 1.86 kW, B. of refrigeration plant used is one fourth that of ideal plant working between the same temperatures. 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 this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of solution heat exchanger is performed. 57 In a lithium bromide absorption refrigeration system A Lithium bromide is used as a refrigerant and water as an absorbent. Answer: Option B 20°C DBT and 50% RH, B. The following are the two principles that form the basis for the lithium bromide absorption refrigeration cycle: 1. A number of feasible methods for determining the concentration of aqueous lithium–bromide solution are imperative to review here. In these systems water is used as refrigerant and a solution of lithium bromide in water is used as absorbent. Figure 15.3 shows another chart wherein the mass fraction of lithium bromide is plotted on abscissa, while saturation It should be noted that the refrigerant in the water-lithium bromide system is water 26°C DBT and 50% RH, C. Vapour absorption refrigeration systems using water-lithium bromide pair are extensively used in large capacity air conditioning systems. 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… In both systems the required refrigeration is provided by refrigerants vaporizing in the evaporator. The lithium-bromide absorption refrigeration system uses a solution of lithium bromide in water. An interesting point to note about absorption chillers is that they don’t use conventional refrigerants. Weak solution mixes with strong solution. 7.44 kW, D. The actual C.O.P. B Water and lithium bromide . A. 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. Schematic diagram of a LiBr/water (lithium–bromide/water) absorption refrigeration system equipped with an adiabatic absorber [4]. A. Lithium bromide is used as a refrigerant and water as an absorbent B. Instead they use water as the refrigerant, and this is mixed with either ammonia or Lithium Bromide. the last 5 years. The lithium bromide solution has a strong affinity for water vapour because of its very low vapour pressure. 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 comprises of all the processes in the vapor compression refrigeration system like compression Electrolux refrigerator, A. D None of these. B Water is used as a refrigerant and lithium bromide as an absorbent. Ammonia is used as a refrigerant and lithium bromide as an absorbent, D. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°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. Heat for the vapour absorption refrigeration system can be provided by waste heat extracted from the process, diesel generator sets etc. Explanation are given for understanding. 18.6 kW, A. Water is being used as refrigerant whereas Li-Br is a highly hydroscopic salt, used as absorbent. 14. None of the above, A. 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. Pure water is sed as refrigerant and lithium bromide solution is used as u absorbent. In that case absorption systems … 26°C DBT and 60% RH, A. Lithium Bromide Absorption Unit Water is used as a refrigerant in the lithium bromide absorption cycle. 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 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. 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. A. Lithium bromide is used as a refrigerant and water as an absorbent, B. 5. 6. The Li-Br solution has a strong affinity for water vapour because of its very low vapour pressure. 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. 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. Such systems can cool the inlet air to 50°F (10°C). 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. C Ammonia 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. This closing of valve will reduce the heat input to generator of absorption chillers and temperature in generator will be reduced. A Water and water . A simple absorption refrigeration system common in large commercial plants uses a solution of lithium bromide or lithium chloride salt and water. Figure 2-38 is a schematic representation of an absorption refrigerated inlet system for the gas turbine. 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. In the absorber, the lithium bromide absorbs the water refrigerant, creating a solution of water and lithium bromide. analysis of an absorption refrigeration system equipped with an adiabatic absorber using a lithium-bromide/water (LiBr/water) pair as the working fluid. The heat leakage from the surrounding is 30 kW for the ambient temperature of 40°C. Water is used as a refrigerant and lithium bromide as an absorbent, C. 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