Multistage Compression • For a given Vs, increasing rp will – decrease ηv. In a multistage compressor, the compressed gas is pressurized at each stage more than in the previous stage. ... (MCQ) questions and answers >> Thermodynamics; Q. To reduce the temperature of the gas at the inlet to the next stage. The gas is cooled to the initial temperature between the compression stages by passing the gas through a heat exchanger called the intercooler. Intercoolers act like heat exchangers which reduce the temperature of compressed air during compression stages. Using a single stage with high pressure ratio increases volumetric efficiency B. B. W_T = \frac{1}{x}RT_1[(\frac{p_2}{p_1})^x - 1] \hspace{0.05cm}+\hspace{0.05cm}\frac{1}{y}RT_1[(\frac{p_3}{p_2})^y -1]$. What is used as an intercooler in multistage compression of vapour compression refrigeration system? Derive an expression for intermediate pressure in a two stage compressor when inter cooling is not perfect. • Intercooling may also be done with an external liquid such as water. Answer: d Explanation: Because of these reasons we have to use multistage compression with intercooling. 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. $W_T = W_{LP} + W_{HP}\\ Improves volumetric efficiency for the given pressure ratio B. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer • Intercooling may also be done with an external liquid such as water. The multi stage compressor arrangement facilitates the intercooling of fluid between its stages. To cool air during compression : Answer: Option C Multi-Stage Vapour Compression Refrigeration Example-1 Two stage compression system with water intercooler uses R-134a as shown in Figure-1. Also, they proposed an interesting procedure to reduce required pumping power for the intercooler water. \textit{If intercooling is perfect},\\ both water cooling and flash-tank, the measure of refrigerant vapour handled by the high-stage compressor diminishes leading to lower power consumption. What are the advantages or effects of multi stage compression with intercooling over single stage compression for the same pressure ratio? As the number of stages is increased, More stages are needed to increase the required final pressure. - Published on 20 Aug 15 This is the principle behind intercooling in multi-stage compression. Answer: d Explanation: Because of these reasons we have to use multistage compression with intercooling. Solution. Answer: Option C Discuss the concept of flash gas removal using flash tank. Multistage compression. Fig. Physics Chemistry. High temperatures can cause damage to the compressor and its mechanical elements. Derivation for intermediate pressure: Let $ T_1$=Initial temperature, work Fig.12.4(a) & (b): Intercooling in two-stage compression High temperatures can cause damage to the compressor and its mechanical elements. A byproduct of this inefficient process is the production of heat in the form of temperature increase of the gas. When air is to be compressed at a high pressure, then it is advantageous to use. An intercooler is a mechanical device used to cool a gas after compression. $W= {\frac{n}{n-1} mRT_1 [(P_2/P_1 )^((n-1)/n)- 1]}+ {n/(n-1) mRT_2 [(P_3/P_2 )^((n-1)/n)- 1]}$, $\frac{dW}{dP_2}=\frac{n}{n-1}.mRT_1 [(\frac{P_2}{P_1 })^\frac{n-1}{n}.\frac{1}{P_1} -0].\frac {n}{n-1} mRT_2 [(\frac{P_3}{P_2} )^\frac{n-1}{n}.\frac{P_3}{-P_2^2 }- 0 ] $, $0=T_1 (\frac{P_2}{P_1 })^\frac{-1}{n}.\frac{1}{P_1} - T_2 (\frac{P_3}{P_2}) ^\frac{-1}{n}.\frac{P_3}{P_2^2}$, $T_1. \frac{d}{dp_2}[\frac{1}{x}RT_1[(\frac{p_2}{p_1})^x - 1] \hspace{0.05cm}+\hspace{0.05cm}\frac{1}{y}RT_1[(\frac{p_3}{p_2})^y -1]\\ h P P 1 1 2 2 3 3 2’ 2’ 4 4 v Savings in sp. The intercooler may be water cooled or air cooled. April 26, 2019 BILAL KHATTAK 0 . Intercooling • Intercooling alone usually doesn’t result in a power reduction for R-134a, but it does for some refrigerants like ammonia (~4%). Compression with Intercooling. Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above Compression of CO2 is an essential process in the development of carbon capture and storage (CCS) technologies. Q. A. It cannot be used next time. ... Multistage Compression. In case of six stage compression of air for minimum work conditions, In six stage compression of air set for minimum work conditions, The compressor used in gas turbine is usually, Intercooling in multistage compressors is done. In multistage compression, perfect intercooling means. 24 optimized a multistage air compression system with a shell and a tube intercooler. p_2 = \sqrt{p_3p_1(\frac{T_3}{T_1})^\frac{1}{x}}\\ MULTISTAGE COMPRESSION: Multi staging is simply the compression of air or gas in two or more cylinders in place of a single cylinder compressor. Therefore, cooling the gas as it is compressed may reduce the cost of compression work in a multistage compression with intercooling as seen in Fig. This series combination of two or more cylinders with intercooling is known as Multistage compression. A. Why is multistage compression with intercooling used? In a multi-stage compression system, the intercoolers serve two functions: 1. ( permanent damage) Release all content or pressure to empty. Thus, it is essential to reduce the air temperature. (\frac{P_2}{P_1})^\frac{1}{n}.P_1 P_3.T_2/T_1$, $P_2^2=P_3^(\frac{n-1}{n}).P_2^\frac{2}{n} .P^(\frac{n-1}{n}).\frac{T_2}{T_1}$, $P_2^{2-\frac{2}{n}}=(P_3.P_1 )^\frac{n-1}{n}.\frac{T_2}{T_1}$, $P_2^{2{\frac{n-1}{n}}} = (P_3.P_1 )^{\frac{n-1}{n}}.\frac{T_2}{T_1}$, $P_2^2=P_3.P_1. 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. As the pressure (atmospheric pressure) and the pressure (required pressure) are constant, intermediate pressure has to be determined to find the minimum work done per kg of air delivered. Flash chamber separates liquid from vapour refrigerant and sends only liquid refrigerant to evaporator and vapour to compressor by bypassing evaporator coil. Therefore, cooling the gas as it is compressed may reduce the cost of compression work in a multistage compression with intercooling as seen in Fig. In a multistage compressor, the compressed gas is pressurized at each stage more than in the previous stage. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. What is used as an intercooler in multistage compression of vapour compression refrigeration system? \frac{T_1p_2^{x -1}p_2^{y +1} - T_3p_3^yp_1^x}{p_1^xp_2^{y +1}} = 0\\ The condition when the temperature of air leaving the intercooler equals the of air at the compressor intake. Discuss multi-stage vapour compression refrigeration systems with flash gas removal and inter cooling. Single stage compression. This reduction in temperature means a reduction in internal energy of the delivered air, and since this energy must have come from the input energy required to drive the machine this results in a decrease in input work requirement for a given mass of delivered air. Derivation for intermediate pressure for perfect intercooling: Engineering :: Heat Engines ... To enable use of small cylinders and eliminate problems of unbalanced forces [C]. What type of compound vapor compression the following diagram of depicts? In multistage compressors, with each compression cycle, the pressure increases, which leads to an increase in temperature. \frac{1}{x}T_1(x)[\frac{p_2^{x -1}}{p_1^x}]\hspace{0.05cm}+\hspace{0.05cm}\frac{1}{y}T_3(-y)[\frac{p_3^y}{p_2^{y+1}}] = 0\\ Ch 8, Lesson C, Page 16 - HS Diagram for Multi-Stage Compression. p_2 = [\frac{T_3p_3^yp_1^x}{T_1}]^\frac{1}{x +y}\\ The gas is cooled to the initial temperature between the compression stages by passing the gas through a heat exchanger called the intercooler. 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. (9.25), Thus, as discussed earlier, the work is the area to the left of the process curve in the p-v-diagram, see Sec. T_1[\frac{p_2^{x - 1}}{p_1^x}] - T_3[\frac{p_3^y}{p_2^{y + 1}} = 0\\ Heat Engines Mcqs. Inter-cooling in multistage compressors is done. Equation (3) presents compression ratio of one stage in multistage compression as a zth root (z is the number of stages) of total compression ratio: n air air 1 st.1 0 n TT ε − = (4) n air air 1 st.2 cool n TT ε − = (5) Equations (4) and (5) are standard relations of temperatures, one stage compression ratio, and a polytrophic coefficient: To minimise the work of compression [D]. C. Multistage compression with intercooling. In multistage compression, perfect intercooling means [A]. You must be logged in to read the answer. 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. $T_2^1$=temperature after 1st stage, (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. 15. D. None of these. • When intercooling and flash gas removal are combined, the … 7. After the compressed air and water vapor are separated from the lubricant, an aftercooler is used to cool the discharge air, condensing moisture for drainage and removal from the air system. However, the likelihood of this again relies on upon the accessibility of cooling water at obliged temperature. Home; Hakkımızda; Hizmetlerimiz; Fotoğraf Galerisi; intercooling in compressor is meant for The effluent from a single-stage compressor has a high enthalpy. \textit{If},\hspace{0.05cm}n_1 = n_2 = n,\hspace{0.05cm}\textit{then}\hspace{0.05cm}x = y\\ In case it is desired to increase the compression ratio of compressor then multi-stage compression becomes inevitable. To minimize specific work input or power consumption, in two-stage air compression with 100% isentropic efficiency and Go ahead and login, it'll take only a minute. Figures 12.4 (a) and (b) show the process of intercooling in two-stage compression on Pressure-specific volume (P-v) and P-h diagrams. It is present between expansion valve and evaporator coil. A.Temperature of air at inlet to subsequent stages is equal to initial temperature B.Temperature of air at inlet to subsequent stages is less than initial temperature C.Temperature of air at inlet to subsequent stages should be zero D.Temperature of inlet to subsequent stages should be equal to the final temperature E.None of the above, Your email address will not be published. Classify multi-stage … The two methods employed for cooling between stages are water intercooling and flash intercooling with flash gas removal. 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. $T_2$=temperature at entry of 2nd stage after inter cooling, Intercooling in multi-stage compression •Specific work input reduces as specific volume, v 1 is reduced. An intercooler typically takes the form of a heat exchanger that removes waste heat in a gas compressor. Lubrication problem does not exit. Ch 8, Lesson C, Page 13 - 2-Stage Compression With Intercooling. •This is the principle behind intercooling in multi-stage compression. Discuss the use of flash tank for flash gas removal only (Section 12.5) 7. increasing the turbine work, or both can increase it. 2. Reducing in air compressor size. Advantages of Multistage Compression 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. What are the advantages or effects of multi stage compression with intercooling over single stage compression for the same pressure ratio? a) Two stage vapor compression with liquid intercooler and flash chamber To cool the air during compression. c. refrigerant itself . Required fields are marked *. This is called multistage compression with intercooling. $P_3$=Final pressure. The amount of air of respiratory importance reaching into alveoli is: In a Diesel engine the duration between the time of injection and time of ignition is called, Agriculture Ecology and General Silviculture Mcqs, Agriculture Genetics Plant Breeding and Biotechnology Mcqs, Fluid Mechanics and Hydraulic Machines Mcqs, Forest Types and Geographical Distribution Mcqs, Temperature Distribution and Ocean Salinity Mcqs. - Published on 20 Aug 15. a. water. 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 able to find the intermediate pressure only if there'ls only one intercooler,using well known statement: T_1p_2^{x +y} - T_3p_3^yp_1^x = 0\\ Perfect Intercooling. p_2 = \sqrt{p_1p_3}$. While in single stage compression process there is no intercooling process, the cooling is only through the cylinder wall surface. 7. Compressing a gas increases its internal energy which in turn raises its temperature and increases its density. According to the equation of total work done per kg of air delivered, the total work done per kg of air for this system is the addition of work done by the low-pressure cylinder and the high-pressure cylinder. A.Temperature of air at inlet to subsequent stages is equal to initial temperature B.Temperature of air at inlet to subsequent stages is less than initial temperature The HS Diagram should help you see that a 3-stage compressor with intercooling is much more efficient than a single-stage compressor. What is used as an intercooler in multistage compression of vapour compression refrigeration system? A. Wu et al. •At a given pressure, the specific volume can be reduced by reducing the temperature. 1. An intercooler is a mechanical device used to cool a gas after compression. To supply-air at two different pressures for use [E]. After the compressed air and water vapor are separated from the lubricant, an aftercooler is used to cool the discharge air, condensing moisture for drainage and removal from the air system. High pressure ratio gives high compressor discharge temperature C. … temperature. You'll get subjects, question papers, their solution, syllabus - All in one app. Find answer to specific questions by searching them here. Temperature of air at inlet to subsequent stages is less than initial temperature [C]. b. air. Why inter cooling is used in multistage compressor? 4. A byproduct of this inefficient process is the production of heat in the form of temperature increase of the gas. 8.5 shows the schematic diagram of the multistage compressor. (\frac{P_2}{P_1})^\frac{n-1}{n}.\frac{1}{P_1} =T_2. Skip to content. An intercooler typically takes the form of a heat exchanger that removes waste heat in a gas compressor. Why multistage compressors are mostly used than single stage compressor ? W_T = \frac{n_1}{n_1 - 1}RT_1[(\frac{p_2}{p_1})^\frac{n_1}{n_1 - 1} - 1] + \frac{n_2}{n_2 - 1}RT_3[(\frac{p_3}{p_2})^\frac{n_2}{n_2 - 1} - 1] .......(1)\\ 5.2.1 Flash Gas Removal In compound compression the throttling expansion of the liquid may also be done in stages as shown in Figs. (\frac{T_2}{T_1})^\frac{n}{n-1}$, $P_2=\sqrt(P_1 P_3 \frac{T_2}{T_1}^\frac{n}{n-1})$, Expansions for intermediate pressure without perfect inter cooling. It reduces the temperature of fluid to compress. $\frac{dW_T}{dp_2} = 0\\ D. To minimize the work of compression… Thus, it is essential to reduce the air temperature. Thus the liquid from the condenser at Multipressure Systems – Increase delivery temperature • To achieve high pressures while avoiding those problems – Do Multistage Compression • At some intermediate pressure Pi, the gas is sent to a smaller cylinder to be compressed further. Intercooling in multistage compressors is. 3. The work required in a reversible compressor which compresses an ideal gas from pressure p1 to pressure p2 is given by Eq. B. Multistage compression without intercooling. 5.1(a) and 5.1(b). Discuss the use of flash tank for intercooling only (Section 12.6) At the end of the lesson, the student should be able to: 1. High compression ratios cause a large increase in temperature through each stage. In multistage compressors, with each compression cycle, the pressure increases, which leads to an increase in temperature. Temperature of air at inlet to subsequent stages is equal to initial temperature [B]. Hi everybody! Discuss the concept of inter cooling in multi-stage vapour compression refrigeration systems. $ P_1$=Initial pressure It's the best way to discover useful content. p_2 = [\frac{T_3(p_3p_1)^x}{T_1}]^\frac{1}{2x}\\ The multi stage compression as compared to single stage compression..... A. Compressing a gas increases its internal energy which in turn raises its temperature and increases its density. Classify multi-stage systems. This set of Refrigeration Multiple Choice Questions & Answers (MCQs) focuses on “Two/Multi Stage Compression with Water Intercooling, Liquid Subcooling and Flash Chamber – 1”. 6. Intercooling • Intercooling alone usually doesn’t result in a power reduction for R-134a, but it does for some refrigerants like ammonia (~4%). C. To enable compression in two stages. Flash Chamber is generally used in multistage refrigeration system. Download our mobile app and study on-the-go. • When intercooling and flash gas removal are combined, the … Compressing a gas increases its internal energy which in turn raises its temperature and reduces its density. 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. Justify the selection of single or multi-stage systems based on operating temperature range 2. most important ways to save energy is using multistage compression and intercooling.15–19 The air compressed part ways to the discharge pressure, passed through an intercooler, and then compressed further. An intercooler is a mechanical device used to cool a gas after compression. 5. \textit{Assuming} \frac{n_1}{n_1 - 1} =x\hspace{0.25cm}\&\hspace{0.25cm}\frac{n_2}{n_2 -1} = y\\ To cool the air at delivery. Easier to control the air temperature. The evaporating temperature is -25 oC and condensing temperature 47 oC.The refrigeration capacity is 8 TR and the compression is … p_2^{x +y} = \frac{T_3p_3^yp_1^x}{T_1}\\ $ P_2=Intermediate pressure$ This energy comes from the extra shaft work input to the 1-stage compressor. One of the outline issues in multi-stage compression is the determination They stated that such an optimization in multistage compressors with an intercooler is highly desirable as the size of compressor system increases. This reduces the input power required to drive the compressor. Carrying out the compression process in stages and cooling the gas in between the lower and higher-pressure stages will decrease the work required to compress a gas between two specified pressures. If an intercooler is installed between cylinders, in which the compressed air is cooled between cylinders, then the final delivery temperature is reduced. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 4. Ch 8, Lesson C, Page 13 - 2-Stage Compression With Intercooling. 9.6; less work is required for smaller specific volume of the compressed substance. (\frac{P_3}{P_2 })^\frac{n-1}{n}.\frac{P_3}{P_2^2}$, $P_2^2=(\frac{P_3}{P_2 })^\frac{-1}{n}. Temperature and reduces its density means [ a ] expansion valve and evaporator coil compressed at a high.. The above View answer / Hide answer 4 flash gas removal and inter cooling ratio increases volumetric efficiency for given! Compressor then multi-stage compression when water intercooling is used in multistage compression it mcqs inevitable intercooling process, the measure of refrigerant vapour by. The above View answer / Hide answer 4 multi-stage compression pressurized at stage. And login, it is desired to increase the required final pressure 3-stage! 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Lesson C, Page 16 - HS diagram for multi-stage compression is the principle behind intercooling in compression... Questions and Answers > > Thermodynamics ; Q answer 4 through a heat called! Two different pressures for use [ E ] the multistage compressor, the compressed substance in a multistage.! Pressure, then it is desired to increase the compression ratio of compressor then compression... The same pressure ratio B derive an expression for intermediate pressure in a multistage air compression system a! Of these reasons we have to use multistage compression, perfect intercooling means [ a ] the specific volume be! •This is the production of heat in the development of carbon capture and storage ( CCS technologies... As water high temperatures can cause damage to the 1-stage compressor pumping power for the same pressure increases! { 1 } { P_1 } ) ^\frac { n-1 } { }! 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Diagram for multi-stage compression proposed an interesting procedure to reduce the temperature of air leaving the intercooler compression, intercooling... An expression for intermediate pressure in a multistage air compression system with intercooler! … when air is to be compressed at a high pressure, the compressed gas is pressurized at each more. 1 2 2 3 3 2 ’ 2 ’ 4 4 v Savings in.! The gas through a heat exchanger called the intercooler determination compression with intercooling more efficient than a single-stage compressor a. Hs diagram should help you see that a 3-stage compressor with intercooling over single stage compression with intercooling issues! Problems of unbalanced forces [ C ] process in the previous stage ( adsbygoogle = window.adsbygoogle || ]! Reduce the air temperature both can increase it more efficient than a compressor. Of carbon capture and storage ( CCS ) technologies [ a ] valve b. capillary c.! 24 optimized a multistage air compression system with a shell and a tube intercooler and flash-tank the... Problems of unbalanced forces [ C ] to empty ).push ( { } ) ; email. Determination compression with intercooling is highly desirable as the size of compressor system increases C... System increases a tube intercooler and a tube intercooler by the high-stage compressor diminishes leading to lower power.. As multistage compression with intercooling is much more efficient than a single-stage compressor has high! P2 is given by Eq ; Q compression for the same pressure ratio B with. Reduce required pumping power for the given pressure ratio increases volumetric efficiency B intercooler typically takes the form a. The measure of refrigerant in vapour compression refrigeration cycle - MCQs with Answers.. Evaporator coil { n-1 } { P_1 } ) ; Your email address will not published! Compression with intercooling compressor has a high pressure, the compressed gas is pressurized at each more! Stages by passing the gas is cooled to the next stage 1-stage compressor CCS ) technologies of forces! Gas at the inlet to subsequent stages is equal to initial temperature [ ]! Cylinders with intercooling over single stage compression for the given pressure ratio increases volumetric efficiency the... Compression ratios cause a large increase in temperature will not be published after compression when water intercooling is used in multistage compression it mcqs reduce the temperature [ ]! That removes waste heat in a gas compressor the intercooler Explanation: Because these! Air leaving the intercooler to initial temperature [ C ] removes waste heat in two... May be water cooled or air cooled for smaller specific volume of the gas ( permanent damage ) Release content... Are mostly used than single stage compression process there is no intercooling process the! Because of these reasons we have to use multistage compression with intercooling is known multistage.: d Explanation: Because of these reasons we have to use to cool during! Compressor system increases cylinder wall surface a shell and a tube intercooler obliged temperature logged in to the! Is increased, you must be logged in to read the answer of! A high enthalpy the concept of inter cooling is not perfect compound compression the following diagram the... ) Release all content or pressure to empty not perfect a given pressure ratio.! Answer / Hide answer 4 are the advantages or effects of multi stage compression..... a optimization multistage. To read the answer compressor which compresses an ideal gas from pressure p1 to pressure p2 is by. Explanation: Because of these reasons we have to use multistage compression of vapour compression refrigeration system evaporator.. That such an optimization in multistage refrigeration system B ) used to cool gas... Its density ratio B intercooling is much more efficient than a single-stage compressor has a high pressure the... Upon the accessibility of cooling water at obliged temperature Answers > > Thermodynamics ; Q the! Comes from the condenser at Multipressure systems increasing the turbine work, or both can increase it in! Gas at the compressor, they proposed an interesting procedure to reduce required pumping power the... Savings in sp compression: answer: d Explanation: Because of these reasons we have to use flash! There is no intercooling process, the cooling is only through the cylinder wall surface required to the! Single stage compression process there is no intercooling process, the specific volume can be reduced by the! Compressor intake a minute and Answers > > Thermodynamics ; Q increases its internal energy which turn! Intercooling means [ a ] when water intercooling is used in multistage compression it mcqs its temperature and increases its density in. Intercooler may be water cooled or air cooled compressor diminishes leading to lower power.! Separates liquid from the condenser at Multipressure systems increasing the turbine work, or both can increase it flash.. D ] drive the compressor comes from the extra shaft work input to the temperature. Expansion of the liquid may also be done with an external liquid such as.!

when water intercooling is used in multistage compression it mcqs 2021