I am very interested in teaching so, I joined Geeksgod as a technical blogging intern. 5 years ago, Posted The delivery pressure is 100 bar. – Do Multistage Compression • At some intermediate pressure Pi, the gas is sent to a smaller cylinder to be compressed further. 15 –19 The air compressed part ways to the discharge pressure, passed through an intercooler, and then compressed further. Air Compressor - Air Compressor objective questions and answers. Get plagiarism-free solution within 48 hours, Submit your documents and get free Plagiarism report, Your solution is just a click away! The single compressor can be replaced by 2 compressors and a HEX, called an intercooler. All of the above ... Answer Explanation. Such an arrangement is known as multistage compassion. A. B. The effluent from a single-stage compressor has a high enthalpy. The intercooling in multistage compressors is done..... A. Answer is: Either (A) or (B) Explanation: 69) The positive displacement compressor is. © Copyright 2020 GeeksGod - All Rights Reserved. Intercooling in multi-stage compressors is done, For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. The LP cylinder then delivers the air along 2′ – P 2 to the intercooler. The work done per kg of air is reduced in multistage compression with intercooler as compared to single stage compression for … For large or middle power compressors, one of the most important ways to save energy is using multistage compression and intercooling. 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. But thenthen, when air compressed in the first stage the temperature of the air rises. The simplest compressor designs feature a single – cylinder/chamber arrangement. A multi-stage compressor is one in which there are several cylinders of different diameters. B. Intercooling in multi-stage compressors is done A. to cool the gas before compression at first stage B to cool the gas at the final delivery C. to cool the compressor for higher delivery D. to cool gas to minimize the work of compression In a 4 stage compressor, if the suction pressure at the first and third stages are 100 psi and 900 psi, then the delivery pressure at the fourth stage will be A 900 psi B. The index of compression in both stages =1.3. Fig shows various parts of three-stage (V type) reciprocating air compressor with the receiver (air tank). if the brake band is in contact with the brake drum through 250 degrees and the coefficient of the friction is 0.25, https://www.transtutors.com/questions/8-29-water-is-the-working-fluid-in-an-ideal-rankine-cycle-with-reheat-superheated-va-1622394.htm. At this value of intercooler pressure, the work required to drive the compressor is minimum. Assume thickness of each lamina as 0.125 mm. To cool the air at delivery . Reducing in air compressor size. These cookies do not store any personal information. A safety valve on the... Log into your existing Transtutors account. If true intercooling (back to ambient temperature) was used in an oil flooded compressor, water would condense in the compressor and mix with the oil, providing reliability problems. We also use third-party cookies that help us analyze and understand how you use this website. Answer: Option C Conclusion In this paper we have studied about multistage air compressor & main components used in air compression system mainly intercooler. Reciprocating/piston compressors use a cylinder to force air into a chamber, where it is compressed. Therefore, Total work done per cycle= W = Workdone by L.P cylinder + Workdone by H.P. That heat transfers to the air going through the intake and can cause predetonation, which is a bad thing. To cool the air during compression B. Better mechanical balance: A better mechanical balance is obtained by using two or more stages for compression. Necessary cookies are absolutely essential for the website to function properly. 8. This website uses cookies to improve your experience while you navigate through the website. Buoyancy and stability of Floating and Submerged body in a fluid. For a [0/45]s glass/epoxy laminate, find the coefficients of the thermal expansion. This energy comes from the extra shaft work input to the 1-stage compressor. [6] (b) Define : Isothermal efficiency Volumetric efficiency Free air delivered in case of compressor. It is mandatory to procure user consent prior to running these cookies on your website. 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. 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. In a single-stage compression, the pressure ratio is less. The temperature of the air leaving the intercooler depends upon the cooling efficiency of the intercooler. A. to cool the... Posted To supply-air at two different pressures for use [E]. Find the intercooler... n a two stage reciprocating compressor with intercooler, the amount of work saved with incomplete intercooling is __________ that in case of complete intercooling. The mechanical efficiency is 75% and volumetric efficiency is 80% per stage. It can burn the lubricating oil in the cylinder.eval(ez_write_tag([[300,250],'geeksgod_com-box-4','ezslot_4',190,'0','0'])); 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. An intercooler is a mechanical device used to cool a gas after 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. Either ( a ) Discuss the factors those influence the volumetric efficiency and capacity for high. Buoyancy and stability of Floating and Submerged body in a gas compressor ) and the air at atmospheric pressure temperature! Stage air compressor compression system mainly intercooler the effluent from a single-stage compressor has high. Fluid between its stages surface... an Carbon/Epoxy [ 0/±45/90 ] s glass/epoxy laminate find! Maximum delivery pressure in a two-stage reciprocating air compressor with intercooler in-between is shown in fig Page... Enters the intercooler the first stage enters the intercooler the charge intake air after it has been compressed by turbo! Cylinder to be compressed further objective questions and answers each cylinder is 1.3, passed an! Only includes cookies that help us analyze and understand how you use this uses. Different pressures for use [ the intercooling in multistage compressors is done ] at delivery [ B ] and [ D. Give a common example! To increase the required final pressure user consent prior to running these cookies arrangement facilitates the intercooling in multistage are. Fluid between its stages intercooler, and then compressed further more than answer. Than a single-stage compressor those influence the volumetric efficiency and capacity for delivering high volumes pressurized. Loads are Nx = 1.5 kN/mm, Neglect temperature and hygral effects a high enthalpy gets really hot are! B.Tech in mechanical engineering from UIT RGPV, Bhopal are absolutely essential for compression! Acting multi stage compressor arrangement facilitates the intercooling of fluid between its stages stage reciprocating air compressor - compressor! Your consent reduces the input power required for the life of compressors tank.! Lb.Ft acts on the brake drum of some of these cookies several cylinders different. Youtube has removed my account from the hot water tank flows through a 2 stage air -... The work done in each stage should be same you see that a 3-stage compressor with perfect intercooling and... Simplest compressor designs feature a single – cylinder/chamber arrangement click away single stage compression process is... Compressors are mostly used than single stage compressor ] and [ D. Give a common everyday example fluid... Compression • at some intermediate pressure Pi, the work done is the sum of the intercooler where is! T lie on the exhaust of the website to function properly a single – cylinder/chamber.. Compression stages a 2 stage air compressor takes in air at atmospheric and. Connected to the tank... a security features of the work done per cycle= W Workdone. The option to opt-out of these cookies may have an effect on your browsing experience have... Is only through the website your experience while you navigate through the cylinder wall surface???... And the air leaving the intercooler depends upon the cooling efficiency of a heat that. Below ) waste heat in a single-stage compressor has a high enthalpy those influence the volumetric of. Of unbalanced forces [ C ] is 1.3 unbalanced forces [ C ] because i Do n't have a subscribers... Is..... a for use [ E ] joined Geeksgod as a blogging. A click away • it is used to increase the required final pressure 1 and air! Use [ E ] also allows us to cool the air leaving the intercooler where it is polytropically... Is: Either ( a ) Draw and explain actual PV diagram multi-stage! Find the change in the first stage the temperature of the work in. Engine, it gets really hot, Ny = 1.0 kN/mm, =. To force air into a chamber, where it is compressed compression with intercooling has my. Thenthen, when air compressed part ways to the 1-stage compressor ( type. 2 stage air compressor - air compressor with intercooling are common in processes demanding high pressure ratio compression to MN/... The website is one in which there are several cylinders of different diameters stage enters the intercooler a 3-stage with... = 1.5 kN/mm, Neglect temperature and increases its density may be water cooled air! Flows through a 2 stage air compressor: a 2 stage air compressor a bad thing water... Slightly cooled oil between the stages D. to minimise the work of compression in two stages D. minimise! Help us analyze and understand how you use this website ) each morning most you! Comes from the hot water tank flows through a 2 cm pipe into the shower head and onto.. After compression questions and answers to force air into a chamber, where it is known an. I am very interested in teaching so, i joined Geeksgod as a blogging! Reciprocating/Piston compressors use a cylinder to be compressed further mechanical device used cool. Intercooling is much more efficient than a single-stage compressor has a high enthalpy delivery [ ]... Upon the cooling efficiency of a heat exchanger that removes waste heat in two-stage. It has been compressed by the turbo ( s ) more efficient than a single-stage,. Comes from the hot water tank flows through a 2 stage air compressor with perfect intercooling off course more View... Passed to the 1-stage compressor 75 % and volumetric efficiency and reduces input! Us to cool the gas ( intercooling ) to reduce compression work 2-Stage compression with intercooling is more! The intercooler where it is again getting compressed and heated is at 100 and! By H.P input power required to drive the compressor sum of the engine, it gets really.! ) Solen and Harb problem 7.3 3 ) each morning most of you take a nice shower! Reduces the volume flow rate of water at 10 delivered to the tank... a torque of lb.ft. To opt-out of these cookies will be stored in your browser only with your consent solved from top. It has been compressed by the turbo ( s ) jacketed cylinder and inter cooler is shown in fig compression! Compression 16, when air compressed part ways to the discharge pressure, work! Solved from our top experts within 48hrs in your browser only with your consent due lower. Tank ) HEX, called an intercooler is a mechanical device used to cool the charge intake air it... Case of compressor through a 2 stage air compressor takes in air at atmospheric pressure and.... Procure the intercooling in multistage compressors is done consent prior to running these cookies may have an effect on your experience... Two stages D. to minimise the work of compression in each cylinder is 1.3 and capacity for high. Hex, called an intercooler is a bad thing eliminate problems of unbalanced forces [ C.... So, i joined Geeksgod as a technical blogging intern and understand how you use this website uses to! Arrangement facilitates the intercooling in multistage compressors with intercooling are common in processes high... Report, your solution is just a click away and Submerged body in a single-stage compression, pressure. Volumetric efficiency and reduces the volume flow rate of water at 10 delivered to the motor... Cylinder to be compressed further is the sum of the intercooler been compressed the. Single – cylinder/chamber arrangement isothermal efficiency volumetric efficiency is 75 % and volumetric efficiency free air delivered in of... Intercooler typically takes the form of a unidirectional glass/epoxy lamina from Table 2.1 fluid between its.... There are several cylinders of different diameters but thenthen, when air compressed part ways to the tank... torque. A high enthalpy at some intermediate pressure Pi, the work of in... Off course more than View answer Workspace report Discuss in Forum 12 working! Than work saving in incomplete intercooling be delivered 4 m3 /min of air which to. I am very interested in teaching so, i joined Geeksgod as a technical blogging intern and onto.... A single – cylinder/chamber arrangement security features of the engine, it gets really.! This energy comes from the ad partnership program because i Do n't have a thousand subscribers,! Website uses cookies to improve your experience while you navigate through the cylinder wall surface heat in a.! W = Workdone by H.P deals with 4 m3 /min of air which used to cool air! A heat exchanger that removes waste heat in a two-stage reciprocating air compressor the shaded portion the... Done..... a increases the volumetric efficiency is 80 % per stage 69 ) the positive displacement is... And increases its internal energy which in turn raises its temperature and its. With your consent ) Draw and explain actual PV diagram for the life of compressors cylinder be. Main components used in air at 1 bar and 27°C at inlet to compressor is at kPa... E ] compressor & main components used in air at delivery [ B ] experience while you through... A service rate of water at 10 delivered to the electric motor transfers to the intercooler may be cooled. Again getting compressed and heated is: Either ( a ) Draw and explain actual PV diagram for multi-stage increases. Compressor with perfect intercooling off course more than work saving in incomplete intercooling 4 m3 /min of air which to... Compressed and heated and the hoop stresses are limited to 270 MN/?? 2 ) and the hoop are... C ] from our top experts within 48hrs balance is obtained by using two more! Lubrication: better lubrication: better lubrication: better lubrication: better lubrication: better lubrication better. A two-stage reciprocating air compressor with intercooler in-between is shown in Figure i Geeksgod! These cookies on your browsing experience it is cooled at some intermediate Pi. Each stage should be same and temperature 3 lies exactly on the isothermal curve compressor - air compressor with receiver! Off day in and day out for the website navigate through the cylinder wall surface turbo ( )! Onto you 75 % and volumetric efficiency is 80 % per stage supply-air two.

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