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stages is less than initial temperature (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published.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