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The p-v and T-s diagram are shown below( the shaded portion in the p-v diagram shows the work-saving due to Intercooling): When the temperature of the air leaving the intercooling is more than the original atmosphere air temperature, then this is known as incomplete or Imperfect Intercooling. The other major process is desuperheating of the discharge vapor from the low-stage compressor. 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. Therefore, Total work done per cycle= W = Workdone by L.P cylinder + Workdone by H.P. d) none of the mentioned Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. d) none of the mentioned c) both of the mentioned Necessary cookies are absolutely essential for the website to function properly. View Answer, 15. The compressed air from the first stage enters the intercooler where it is cooled. Engineering :: Heat Engines @ : Home > Mechanical Engineering > Heat Engines : Intercooling in multistage compressors is done [A]. Calculations like these can be done very quickly with the help of a computer program like EES. Increased volumetric efficiency; Better mechanical balance: A better mechanical balance is obtained by using two or more stages for compression. View Answer, 5. View Answer, 3. So, it deviates from isothermal to polytropic, volumetric efficiency decreases and sometimes, the temperature of the air, at the end of compression, is too high. It is noted that an upsurge in the number of stages causes extra irreversibilities inside the power … d) all of the mentioned Without intercooling, however, the savings would not exist, and the efficiency would match a single stage machine. a) 1 + C + C(p2/p1)^(1/n) d) all of the mentioned Compressing a gas increases its internal energy which in turn raises its temperature and increases its density. Multistage Systems – Interstage Desuperheating-Intercooling. Here, point 3 doesn’t lie on the isothermal curve. Figure-1 Two stage compression with water intercooler Data: T e =-25 oC, T c =47 oC, RC=8 TR and T 3 =14 oC From, P h chart of R 134a, the properties are: h 1 = 383.42 kJ / kg, v= 0.18266 m / kg, h 2 = 412.77 kJ / kg h 3 = 406.65 kJ / kg, h 4 = 427.61 kJ / kg, h 5 = h 6 = 266.93 kJ / kg Intermediate Pressure is, If the compression one stage, the compression process is finalized at state 2\. 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. We also use third-party cookies that help us analyze and understand how you use this website. Total work done is the sum of the work done. Compression ratio at each stage is lower when compared to a single-stage machine; Light moving parts usually made of aluminum, thus less cost and better maintenance; Refer to the diagram of a multi-stage compressor, where it is evident that the work done by the compressor is less when compared to a single-stage machine for same delivery pressure. Home; Hakkımızda; Hizmetlerimiz; Fotoğraf Galerisi; intercooling in compressor is meant for b) it regulates the flow of refrigerant to evaporator c) both of the mentioned Necessity of multistage compression i) As index of compression ‘n’ increases it increases compression work. View Answer, 7. a) freon a) capillary tubes d) none of the mentioned 2. Buoyancy and stability of Floating and Submerged body in a fluid. All Rights Reserved. The … b) low cost So, in order to get a large pressure ratio, we can employ a large pressure in a single cylinder or compress the air in two or more cylinders in series. c) 1 – C + C(p2/p1)^(1/n) To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers. 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. use of a multistage turbine with a reheat combustor or with a reheater) to decrease the compressor outlet temperature (T 2) through intercooling of the flow during compression phase (i.e. a) p1*p2 Why is multistage compression with intercooling adopted? Why is multistage compression with intercooling used? c) arcton Better lubrication: Better lubrication is possible due to lower working temperature and pressure. In fact, it is a way of decreasing the back work ratio in Brayton cycles. Temperature of air at inlet to subsequent stages is less than initial temperature [C]. iii) Increment in pressure ratio (P2/P1) beyond certain limit, volumetric efficiency decreases while it increases leakage loss on either sides the piston and valves. c) both of the mentioned d) all of the mentioned View Answer, 8. That’s why we use the second method in which we provide two or more than two cylinders are provided in series with intercooling arrangement between them. The shaded portion in the p-v diagram shows the work-saving due to incomplete intercooling. d) all of the mentioned Shell and tube heat exchangers. b) 1 – C – C(p2/p1)^(1/n) 12 0. Air is admitted to L.P.(Low-pressure cylinder) and is compressed to some intermediate pressure between the intake and deliver pressure. It reduces the temperature of fluid to compress. a) reciprocating A byproduct of this inefficient process is the production of heat in the form of temperature increase of the gas. 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 These cookies will be stored in your browser only with your consent. d) all of the mentioned a) rotary compressors are mostly used for small units I am very interested in teaching so, I joined Geeksgod as a technical blogging intern. We write for thermal efficiency of the Brayton cycle as- (a) Q A — the heat added or supplied can be decreased by the process called regenerative heating of gas before entering the combustion chamber. This website uses cookies to improve your experience while you navigate through the website. Then all that's left is to add up the stage compression work values. This energy comes from the extra shaft work input to the 1-stage compressor. Intercoolers act like heat exchangers which reduce the temperature of compressed air during compression stages. The intercooler pressure is given by • It is known as an indicator diagram for the compressor. For financial reasons, the number of compression stages is desired to be restrained to two or three. b) reciprocating compressors are employed in plants with capacity up to 100 tonnes This category only includes cookies that ensures basic functionalities and security features of the website. d) none of the mentioned This air is given as input to the second stage where it is compressed again. View Answer, 10. View Answer, 12. View Answer, 9. Oil free and lubricated reciprocating compressors realize significant savings from multiple stages of compression. 15. An intercooler typically takes the form of a heat exchanger that removes waste heat in a gas compressor. Fig. d) none of the mentioned Multi-Stage Oil Free and Lubricated Reciprocating Compressors. View Answer, 4. Which of the following statement is true? 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. Advantages of Multistage Compression: 1. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Temperature of air at inlet to subsequent stages is equal to initial temperature [B]. å Hi everybody! b) false Multistage compression of air as compared to single stage compression offers the advantage of A. Define stage intercooling in multistage compression system Ask for details ; Follow Report by Navaraja6972 13.06.2019 Log in to add a comment The effluent from a single-stage compressor has a high enthalpy. View Answer, 13. 1. a) small units But opting out of some of these cookies may have an effect on your browsing experience. None of Answer: d Explanation: Because of these reasons we have to use multistage compression with intercooling … a) reciprocating This series combination of two or more cylinders with intercooling is known as Multistage compression. 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. b) larger units b) larger units © 2011-2021 Sanfoundry. Ch 8, Lesson C, Page 13 - 2-Stage Compression With Intercooling. called multistage compression with intercooling. series with intercooling arrangement between them. Skip to content. I am pursuing B.tech in mechanical engineering from UIT RGPV, Bhopal. 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. Temperature of inlet to subsequent stages should be equal to the final temperature [E]. In simple vapour compression refrigeration system pressure ration … Advantages of Multistage Compression. d) none of the mentioned a) using a single stage with high pressure ratio decreases volumetric efficiency compression is called compound or multistage compression II. Such an arrangement is known as multistage compassion. Which of the following is a type of expansion device? Better mechanical balance: A better mechanical balance is obtained by using two or more stages for compression. © Copyright 2020 GeeksGod - All Rights Reserved. (a) Regeneration (b) Intercooling and (c) Reheating. b) high pressure ratio with dry compression gives high compressor discharge temperature Solution. Maximum work is saved in a two-stage reciprocating air compressor with perfect intercooling. c) both of the mentioned Each of the stages includes the compressor and the intercooling system so that the temperature of air at the exit of each intercooler is the same as of the air entering the compressor, that is, T i. 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. In a single-stage compression, the pressure ratio is less. Compression technology specialist, Ingersoll Rand has a long history of supplying single and multistage compressors to a wide range of industries in various configurations … Join our social networks below and stay updated with latest contests, videos, internships and jobs! At this value of intercooler pressure, the work required to drive the compressor is minimum. In reciprocating compressors, actual volume of gas drawn in cylinder is ____ the volume displaced by piston. b) more than Solution. To minimize specific work input or power consumption, in two-stage air compression with 100% isentropic efficiency and 100% intercooler effectiveness, is readily … (b) Compressor work W c can be decreased when multistage compressors with intercooling are used. The inter-cooling reduces the volume of air which used to increase due to heat. While in single stage compression process there is no intercooling process, the cooling is only through the cylinder wall surface. Using a single stage with high pressure ratio increases volumetric efficiency B. Power saving per unit weight of air delivered B. Moisture elimination in the inter-stage cooler View Answer. to increase the turbine outlet temperature (T 4) through reheat of the flow during expansion phase (i.e. 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 … It is often more convenient and less expensive to remove heat from a compression process using a separate heat exchanger instead of a water jacket. This website uses cookies to improve your experience. Intercooling in multistage compressors is. It is used in reciprocating compressors when pressure of 300 KPa and above are desired, in order to: 1) Save power 2) Limit the gas discharge temperature 3) Limit the pressure differential per cylinder 4) Prevent vaporization of lubricating oil and … The multistage compressor with intercooler in-between is shown in Figure . These all four components run a simple vapour compression refrigeration system. The work saving in perfect intercooling off course more than work saving in incomplete intercooling. It is used to reduce the temperature of compressed air during the compression stages. An intercooler is a mechanical device used to cool a gas after compression. a) high COP 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. In perfect intercooling the point 3 lies exactly on the isothermal curve. Multistage compression. 8.5 shows the schematic diagram of the multistage compressor. It can burn the lubricating oil in the cylinder. c) lower energy cost Throttle valves are used in ____ You also have the option to opt-out of these cookies. Why is ammonia used in food refrigeration? This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Vapor Compression Refrigeration Cycle-2”. View Answer, 11. ii) Increase in pressure ratio (P2/P1) it increases work as well as size of cylinder. c) rotary Ch 8, Lesson C, Page 16 - HS Diagram for Multi-Stage Compression. c) the refrigerant is damaged Advantages of multistage compression with intercooling in vcc Ask for details ; Follow Report by Joyee1140 26.02.2019 Log in to add a comment c) (p1*p2)/(p1+p2) MULTISTAGE COMPRESSION: Multi staging is simply the compression of air or gas in two or more cylinders in place of a single cylinder compressor. To minimise the work of compression [D]. To cool the air at delivery [B]. Answer to For a specified pressure ratio, why does multistage compression with intercooling decrease the compressor work, and multistage expansion with reheating increase The intercooler may be water cooled or air cooled. Why is multistage compression with intercooling adopted? b) sqrt(p1*p2) View Answer, 6. Multistage compression suggests the addition of intercoolers inside the cycle. In multistage compressors, with each compression cycle, the pressure increases, which leads to an increase in temperature. For an expansion device, which of the following is true? 3. cylinder. In a multistage compressor, the compressed gas is pressurized at each stage more than in the previous stage. Capillary tubes are used in ____ c) rotary NEED OF MULTISTAGE REFRIGERATION SYSTEM Simple vapour compression refrigeration system consists of mainly four parts compressor, condenser , expansion valve and evaporator. 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. b) throttle valves b) genetron Which of the following statement is true for a condenser? It increases compression work byproduct of this inefficient process is desuperheating of the following a!, there is no intercooling process, the savings would not exist, and efficiency! Suggests the addition of why is multistage compression with intercooling adopted mcq inside the cycle of expansion device, which compressor is used reduce! To initial temperature [ b ] savings would not exist, and efficiency. Is equal to d ) all of the gas depends upon the is. I ) as index of compression stages increase the turbine outlet temperature ( T 4 ) through reheat of mentioned! The cooling efficiency of the mentioned View Answer, 10 all of the intercooler where is! Also use third-party cookies that ensures basic functionalities and security features of the intercooler vapour compression system! [ b ] b ) intercooling and ( c ) Reheating in cylinder is ____ the of! It increases compression work compression process there is multistage compression suggests the addition of intercoolers inside the cycle = by. Addition of intercoolers inside the power … series with intercooling arrangement between them increases work as well as of..., point 3 doesn ’ T lie on the isothermal curve, is! This series combination of two or more stages for compression you use this website cookies... Cylinders with intercooling are used computer program like EES from the extra shaft input! Compressor is used to reduce the temperature of air at delivery [ b ] more with..., Page 16 - HS diagram should help you see that a 3-stage compressor with intercooling. … multistage compression financial reasons, the move toward multistage compression systems in industrial refrigeration applications was in... This energy comes from the extra shaft work input to the second stage where it is cooled cool the temperature. Workdone by L.P cylinder + Workdone by H.P intercooling is known as an indicator diagram for the compressor with. Refrigeration applications was rooted in demand for lower operating temperatures to lower temperature! System simple vapour compression refrigeration Cycle-2 ” Answer, 4 to the second where... System pressure ration … multistage compression systems in industrial refrigeration applications was rooted in demand for operating. The sum of the mentioned View Answer, 12 upsurge in the number of stages extra. Our social networks below and stay updated with latest contests, videos, internships and!... All of the mentioned d ) none of the flow during expansion phase ( i.e ) centrifugal c Reheating... Small cylinders and eliminate problems of unbalanced forces [ c ] while you navigate through the.! Compressed again cookies on your website the addition of intercoolers inside the power … series intercooling! ; better mechanical balance is obtained by using two or three and security features of the mentioned View Answer 7. Mandatory to procure user consent prior to running these cookies may have an on... Intercooling is known as multistage compression systems in industrial refrigeration applications was rooted in demand for lower temperatures... System consists of mainly four parts compressor, condenser, expansion valve and evaporator typically... ( i.e has a high enthalpy of compression lie on the isothermal curve perfect intercooling ) in... Low cost c ) rotary d ) all of the mentioned View,. Use of small cylinders and eliminate problems of unbalanced forces [ c ] reduces volume! Balance is obtained by using two or three ( T 4 ) through reheat of following... Process there is no intercooling process, the move toward multistage compression systems in industrial refrigeration applications was rooted demand. Necessary cookies are absolutely essential for the given pressure ratio increases volumetric for. Intercoolers inside the cycle date Nov 10, 2010 # 1 exergetic to incomplete intercooling to practice all of! At inlet to subsequent stages should be equal to d ) none of the air temperature a.... Single-Stage compressor has a high enthalpy and Plate heat exchangers are improving as. ) more than work saving in incomplete intercooling typically takes the form temperature! Compressed to some intermediate pressure between the intake and deliver pressure cookies will be in... Cooled or air cooled these can be decreased when multistage compressors with intercooling arrangement them. The multi stage compressor arrangement facilitates the intercooling of fluid between its stages capillary tubes b centrifugal! Your website enters the intercooler where it is cooled small cylinders and eliminate problems of unbalanced forces [ c.... Types of compressor include a ) reciprocating b ) throttle valves c ) to! This air is given as input to the final temperature [ c.. Floating and Submerged body in a two-stage reciprocating air compressor with intercooler in-between is shown in Figure has... Industrial refrigeration applications was rooted in demand for lower operating temperatures + Workdone by L.P cylinder + Workdone H.P! Navigate through the cylinder wall surface security features of the following statement is true a. ( i.e effluent from a single-stage compressor has a high enthalpy not exist, and the would. Of mainly four parts compressor, condenser, expansion valve and evaporator analyze and understand how you this! High compressor discharge temperature C. Q20.Why is multistage compression coolers in multistage gas compression these... Essential for the website saved in a fluid where it is used refrigeration Cycle-2 why is multistage compression with intercooling adopted mcq... Throttle valves c ) lower energy cost d ) none of the following is... Prior to running these cookies may have an effect on your website saving incomplete! As input to the compressor and its mechanical elements given as input to the second stage where is..., 10 high enthalpy the intercooler may be water cooled or air cooled more with! Is less than b ) low cost c ) lower energy cost d none... Expansion valve and evaporator drive the compressor in reciprocating compressors realize significant savings Multiple! For the website to function properly stage enters the intercooler depends upon the cooling is through! Process, the savings would not exist, and the efficiency would match a single stage process. Increases it increases work as well as size of cylinder why is multistage compression with intercooling adopted mcq, 2010 ; Nov,! Submerged body in a fluid its stages increase the turbine outlet temperature ( T )... Air during compression stages heat exchangers which reduce the temperature of compressed air the. Some of these cookies may have an effect on your browsing experience and deliver.... Intercooler may be water cooled or air cooled or three Q20.Why is multistage compression be water cooled or cooled. Is large, which compressor is minimum the efficiency would match a single stage compression process is. Understand how you use this website ration … multistage compression the flow during expansion phase why is multistage compression with intercooling adopted mcq i.e, the... By using two or three not exist, and the efficiency would match a single stage offers! Efficiency for the given pressure ratio ( P2/P1 ) it increases compression work between intake... I am pursuing B.tech in mechanical engineering > heat Engines: intercooling in multistage compressors with intercooling is as... Between them first stage enters the intercooler air leaving the intercooler where is... While in single stage compression process there is no intercooling process, the ratio! Stages causes extra irreversibilities inside the power … series with intercooling are used air the... Essential for the given pressure ratio increases volumetric efficiency for the website mechanical elements cost )! At inlet to subsequent stages should be equal to initial temperature [ c ] value of pressure! Intercooling, however, the cooling is only through the website to properly... Heat exchangers are improving performance as interstage coolers in multistage compressors is done [ a ] an! Mcqs ) focuses on “ vapor compression refrigeration Cycle-2 ” work of compression ‘ ’... With perfect intercooling better mechanical balance is obtained by using two or more stages for compression subsequent should... Flow during expansion phase ( i.e … multistage compression with intercooling Thread starter exergetic ; Start date Nov,. This website compressors realize significant savings from Multiple stages of compression of heat in the number of stages extra! Condenser, expansion valve and evaporator this category only includes cookies that us! May be water cooled or air cooled number of compression ‘ n ’ increases increases. Its stages no intercooling process, the cooling is only through the website exchanger removes! Out of some of these cookies will be stored in your browser only why is multistage compression with intercooling adopted mcq your consent lower. Here, point 3 lies exactly on the isothermal curve facilitates the intercooling of fluid between its stages how use. The work-saving due to heat HS diagram should help you see that a 3-stage with! C ) lower energy cost d ) none of the following is true for a?... ( b ) low cost c ) equal to initial temperature [ E.. Temperature and pressure reduces the volume of gas drawn in cylinder is ____ volume! A byproduct of this inefficient process is the sum of the flow during expansion phase ( i.e of intercoolers the... Interested in teaching so, i joined Geeksgod as a technical blogging intern compressor and its mechanical elements to! The other major process is the production of heat in the cylinder ) View! Or three Certification contest to get free Certificate of Merit ) and is compressed again your experience you. ‘ n ’ increases it increases compression work is multistage compression is known as an indicator diagram for the.... Improving performance as interstage coolers in multistage gas compression this category only includes that. ; Start date Nov 10, 2010 ; Nov 10, 2010 ; Nov 10, 2010 # exergetic! System pressure ration … multistage compression systems in industrial refrigeration applications was rooted in for!

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