What is the use of multistage compression in vapour compression refrigeration system? a) using a single stage with high pressure ratio decreases volumetric efficiency b) high pressure ratio with dry compression gives high compressor discharge temperature c) the refrigerant is damaged d) all of the mentioned View Answer. Advantages of multi-stage compression 1-The work done in compressing the air is reduced, thus power can be saved. In multi stage compressor, compression takes in stages. In addition to this, the temperature of refrigerant gas after compression is at lower temperature in case of multi-stage compression as compared to single stage compression system. The multi-stage compression system has better energy and exergy efficiencies with the increase of compression stage number. 35. It also reduces thermal stress. The Isothermal compression or expansion more closely models real life when the compressor has a large heat exchanging surface, a small gas volume, or a long time scale (i.e., a small power level). Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above What are its advantages? According to the number of stages: Single stage and Multi stage [Anna Univ.May’03,Nov’02, Apr’04, May’06,Nov’10, Dec’13 & May’15] The work done per kg of air is reduced in multistage compression with intercooler as compared with single stage compression for the same delivery pressure. Single-stage compressors are used for household tasks. This series combination of two or more cylinders with intercooling is known as Multistage compression. The so-called multi-stage compression, that is, depending on the desired pressure to the cylinder of the compressor is divided into several stages, progressively increasing the pressure. Compression ratio = Total volume / Clearance Volume. •At a given pressure, the specific volume can be reduced by reducing the temperature. Multistage compression refers to the compression process completed in more than one stage i.e., a part of compression occurs in one cylinder and subsequently compressed air is sent to subsequent cylinders for further compression. 2-Prevents mechanical problems as the air temperature is controlled. The vapor-compression uses a circulating liquid refrigerant as the medium (usually R134a) which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere.The figure depicts a typical, single-stage vapor-compression system. At off-design conditions, the calculations show that flow reversal first occurs near the blade leading edge. How can we reduce the work done in compression? Question is ⇒ Which is false statement about multistage compression ., Options are ⇒ (A) Power consumption per unit of air delivered is low, (B) Volumetric efficiency is high, (C) It is best suited for compression ratios around 7:1, (D) The moisture in air is condensed in the intercooler, (E) Outlet temperature is reduced., Leave your comments or Download question paper. efficiency is low for given pressure ratio, Volumetric Ideal compression B. adiabatic compression It is used to reduce the temperature of compressed air during the compression stages. From there, it proceeds to the storage tank. multi stage compressor Multistage compression refers to the compression process completed in more than one stage i.e., a part of compression occurs in one cylinder and subsequently compressed air is sent to subsequent cylinders for further compression. Temperature cylinders are small when compared to single cylinder compression. 17. have agreed on Single Stage Compressor stations are more efficient than Multistage when you are evaluating the P/L system. Meanwhile, in a multistage compressor, the pressurised air passes through another smaller piston for further compression. than one cylinder are connected in series. Normally, single stage compressor is used for compression ratios of around 7.0 to 9.0 depending upon the capacity of the plant. Improves volumetric efficiency for the given pressure ratio B. They’re also more suited for high-powered applications like sanding and painting. a. They have also agreed on 1.4-1.5 Compression Ratio per station (single stage i.e. Individual The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation_____? M. Chandrashekar, in Solar Energy Conversion II, 1981. High Is a Multistage A/C Compressor Better Than a Single-Stage Compressor?. 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