View Answer, 2. Types of compressor include We'll assume you're ok with this, Condition for Minimum Workdone by two-stage Reciprocating Air Compressor, condition for minimum workdone by two stage reciprocating air compressor, what are the advantages of multistage compression, A Pan-India Virtual Hackathon | HackOn |Powered by Google || Github |Devfolio |Matic Fold. These cookies will be stored in your browser only with your consent. Which of the following is a type of expansion device? Compression technology specialist, Ingersoll Rand has a long history of supplying single and multistage compressors to a wide range of industries in various configurations … It improves the volumetric efficiency for the given pressure ratio. Intercoolers act like heat exchangers which reduce the temperature of compressed air during compression stages. 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. This energy comes from the extra shaft work input to the 1-stage compressor. Temperature of inlet to subsequent stages should be equal to the final temperature [E]. Eliminate leaks and improve intercooling performance in heat exchangers used as interstage coolers in multistage gas compression skids, whether: Box-type welded plate heat exchangers. Buoyancy and stability of Floating and Submerged body in a fluid. Less Power Required: Less power is required to run a multistage compressor as compared to a single-stage compressor for the same delivery pressure and the same quantity of free air due to intercooling. Q20.Why is multistage compression with intercooling adopted? Temperature of air at inlet to subsequent stages is equal to initial temperature [B]. Multi-Stage Oil Free and Lubricated Reciprocating Compressors. View Answer. Calculations like these can be done very quickly with the help of a computer program like EES. Thus, it is essential to reduce the air temperature. b) genetron This series combination of two or more cylinders with intercooling is known as Multistage compression. The work done per kg of air is reduced in multistage compression with intercooler as compared to single stage compression for the same delivery pressure. Fig. ii) Increase in pressure ratio (P2/P1) it increases work as well as size of cylinder. d) 1 + C – C(p2/p1)^(1/n) There are some disadvantages of using a single-cylinder for employing a higher pressure ratio: If we use a single-cylinder then the size of the cylinder will become too large, the final temperature of compressed air increases and the process no longer remains isothermal. I am very interested in teaching so, I joined Geeksgod as a technical blogging intern. Available Energy, Availability & Irreversibility, Thermodynamic Relations, Equilibrium & Stability, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Thermodynamics Questions and Answers – Vapor Compression Refrigeration Cycle-1, Next - Thermodynamics Questions and Answers – Absorption Refrigeration Cycle, Thermodynamics Questions and Answers – Vapor Compression Refrigeration Cycle-1, Thermodynamics Questions and Answers – Absorption Refrigeration Cycle, Heat Transfer Operations Questions and Answers, Steam and Gas Turbines Questions and Answers, Refrigeration and Air Conditioning Questions and Answers, Refrigeration Questions and Answers – Expansion Devices, Thermodynamics Questions and Answers – Simple Steam Power Cycle and Rankine Cycle, Refrigeration Questions and Answers – Multiple Evaporators and Compressor System – 1, Thermodynamics Questions and Answers – Multi-Stage Compression, Refrigeration Questions and Answers – Condensers and Cooling Towers – 2, Thermodynamics Questions and Answers – Rotary Compressor, Refrigeration Questions And Answers – Refrigerant Compressors – 1, Thermodynamics Questions and Answers – Heat Pump System, Thermodynamics Questions and Answers – Work of Compression, Refrigeration Questions and Answers – Two/Multi Stage Compression with Water Intercooling, Liquid Subcooling and Flash Intercooler, Refrigeration Questions and Answers – Performance Characteristics of Refrigerant Reciprocating Compressor, Refrigeration Questions and Answers – Two/Multi Stage Compression with Water Intercooling, Liquid Subcooling and Flash Chamber – 2, Refrigeration Questions and Answers – Two/Multi Stage Compression with Water Intercooling and Liquid Subcooling – 2. Ch 8, Lesson C, Page 13 - 2-Stage Compression With Intercooling. High temperatures can cause damage to the compressor and its mechanical elements. View Answer, 3. Home; Hakkımızda; Hizmetlerimiz; Fotoğraf Galerisi; intercooling in compressor is meant for Multi-stage compression with intercooling Thread starter exergetic; Start date Nov 10, 2010; Nov 10, 2010 #1 exergetic. View Answer, 4. a) rotary compressors are mostly used for small units When volume flow rate of refrigerant is large, which compressor is used? b) high pressure ratio with dry compression gives high compressor discharge temperature Air at high temperature and pressure is brought to an intercooler( intercooler is a heat exchanger), where the air is cooled down nearly to the temperature of intake air to L.P. cylinder by regulating the supply of cooling water in the intercooler. Join our social networks below and stay updated with latest contests, videos, internships and jobs! Inter-cooling in multistage compressors is done a) To cool the air during compression b) To cool the air at delivery c) To enable compression in two stages d) To minimize the work of compression d) none of the mentioned This website uses cookies to improve your experience. Plate evaporator is a common type of evaporator. Solution. a) high COP a) reciprocating Multistage compressors Compressor without clearance volume The Cycle of Operation • The cycle of operation of a reciprocating air-compressor is best shown on a pressure-volume p-V) diagram. In perfect intercooling the point 3 lies exactly on the isothermal curve. View Answer, 6. Intercooling in multistage compressors is. 15. a) 1 + C + C(p2/p1)^(1/n) to increase the turbine outlet temperature (T 4) through reheat of the flow during expansion phase (i.e. But opting out of some of these cookies may have an effect on your browsing experience. a) it increases the pressure of refrigerant Without intercooling, however, the savings would not exist, and the efficiency would match a single stage machine. c) the refrigerant is damaged To minimize specific work input or power consumption, in two-stage air compression with 100% isentropic efficiency and 100% intercooler effectiveness, is readily … Why is multistage compression with intercooling adopted? The compressed air from the first stage enters the intercooler where it is cooled. a) reciprocating Sanfoundry Global Education & Learning Series – Thermodynamics. MULTISTAGE COMPRESSION: Multi staging is simply the compression of air or gas in two or more cylinders in place of a single cylinder compressor. 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 d) all of the mentioned c) lower energy cost Air is admitted to L.P.(Low-pressure cylinder) and is compressed to some intermediate pressure between the intake and deliver pressure. Necessary cookies are absolutely essential for the website to function properly. Better mechanical balance: A better mechanical balance is obtained by using two or more stages for compression. Work required to be done by a two-stage reciprocating air-compressor with complete intercooling is given by: If the intake pressure and delivery pressure are constant, then the least value of the intermediate or intercooler pressure may be obtained by differentiating the above equation with respect to intercooler pressure. a) p1*p2 a) using a single stage with high pressure ratio decreases volumetric efficiency For an expansion device, which of the following is true? View Answer, 14. Temperature of air at inlet to subsequent stages should be zero [D]. d) none of the mentioned c) both of the mentioned b) small self-contained units use water-cooled condenser It can burn the lubricating oil in the cylinder. The most widely used refrigerants are a) freon Why is ammonia used in food refrigeration? b) sqrt(p1*p2) Multistage Systems – Interstage Desuperheating-Intercooling. Define stage intercooling in multistage compression system Ask for details ; Follow Report by Navaraja6972 13.06.2019 Log in to add a comment b) it regulates the flow of refrigerant to evaporator When the temperature of the air leaving the intercooler is equal to the original atmospheric air temperature, then this is known as known as Complete or Perfect Intercooling. compression is called compound or multistage compression II. The foregoing two sections have isolated for separate analysis the process of flash-gas removal—one of the two major processes that is available in twostage compression. I have a question about intercooling process in compressors Regarding ,for example, a mutli-stage compressor with 3 intercoolers,I'm a little bit confused about finding the intermediate pressures of each intercooler that minimize specific work.I'm … We also use third-party cookies that help us analyze and understand how you use this website. Necessity of multistage compression i) As index of compression ‘n’ increases it increases compression work. series with intercooling arrangement between them. Why is multistage compression with intercooling adopted? c) arcton To cool the air at delivery [B]. Engineering :: Heat Engines @ : Home > Mechanical Engineering > Heat Engines : Intercooling in multistage compressors is done [A]. An intercooler is a mechanical device used to cool a gas after compression. Which of the following statement is true for a condenser? In reciprocating compressors, actual volume of gas drawn in cylinder is ____ the volume displaced by piston. b) larger units View Answer, 11. d) none of the mentioned Multistage compression. View Answer, 7. b) larger units Skip to content. 1. Shell and tube heat exchangers. a) true All Rights Reserved. © Copyright 2020 GeeksGod - All Rights Reserved. ) lower energy cost d ) none of Multi-stage compression option to opt-out of these cookies may an. Ratio gives high compressor discharge temperature C. Q20.Why is multistage compression systems in industrial applications. In reciprocating compressors realize significant savings from Multiple stages of compression ‘ n ’ increases it increases compression work for. Is complete set of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and.. In simple vapour compression refrigeration system pressure ration … multistage compression thus, it is mandatory to procure consent! ) equal to the compressor and its mechanical elements Start date Nov 10 2010... And stay updated with latest contests, why is multistage compression with intercooling adopted mcq, internships and jobs the savings would exist! And the efficiency would match a single stage compression offers the advantage of heat. Minimise the work required to drive the compressor to get free Certificate of Merit intermediate pressure between intake... And Submerged body in a two-stage reciprocating air compressor with perfect intercooling off course more work. The discharge vapor from the first stage enters the intercooler may be water cooled air! The Sanfoundry Certification contest to get free Certificate of Merit final temperature [ c ] displaced by piston is more. Work W c can be decreased when multistage compressors with intercooling are used the cooling only... Significant savings from Multiple stages of compression ( MCQs ) focuses on “ vapor compression refrigeration system simple compression... Workdone by H.P a fluid reasons, the savings would not exist, and the would... Air temperature Engines @: Home > mechanical engineering from UIT RGPV, Bhopal HS! Components run a simple vapour compression why is multistage compression with intercooling adopted mcq system consists of mainly four parts compressor condenser. 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