In this article, we’re going to be understanding the term refrigeration ton. How it works : Energy equation for refrigerant, (h + KE +PE )of inlet + Q - W = (h +KE +PE)of outlet. Our Copeland™ compressor line-up has continuously set the standard in performance and reliability. The article describes everything you ever wanted to know about container refrigeration units. This flash chamber between the condenser and evaporator is known as flash intercooling. Dry saturated liquid. 2. As the rotors intermesh, they reduce the volume of trapped air and deliver it compressed to the proper pressure level. Refrigeration may be defined as lowering the temperature of an enclosed space by removing heat from that space and transferring it elsewhere. d) none of the mentioned a) small units Their qualification with lower GWP refrigerants make them compliant with refrigerant regulations such as F-Gas in Europe. All these cooling parts are well integrated in one unit. The machine remained in use there until about 1957, when the Carrier Company repurchased the compressor for donation to the Smithsonian. View Answer. b) genetron In refrigeration and air conditioning, this type of compressor is also known as a rotary compressor, with rotary screw compressors being also known simply as screw compressors. View Answer. b) it regulates the flow of refrigerant to evaporator d) all of the mentioned b) small self-contained units use water-cooled condenser Enerflex refrigeration systems are utilized around the world providing efficient cooling for a variety of applications beyond gas processing, such as CO 2 scrubbing in clean coal power generating facilities. As the compressor efficiency varies at higher compressor efficiencies, the specific enthalpy at state 3 (compressor exit) for Systems 1, 2, and 3 are identical. The use of gas eliminated the need for an electric compressor motor and decreased the size of the refrigerator. From stage 1 to stage 2, the enthalpy of the refrigerant stays approximately constant, thus . 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Q22.The most widely used refrigerants are The highest temperature during the cycle, in a vapour compression system, occurs after, 4. 8. c) both of the mentioned 4. Clean and Quiet Operation. That means that if the compressor removes vapor faster than it can be formed, the pressure will fall and with it the temperature in the evaporator. Cascade refrigeration systems may also be implemented using 2 compressors. Figure 10.18 Schematic layout of a cascade system. This, between the condenser and evaporator is known as, Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ). Contact us: info@mechanicaltutorial.com, One tonne is the total mass of the machine, One tonne of water can be converted into ice, Refrigeration and airconditioning objective Q & A part-1, Production Technology and Manufacturing Process. Which of the following is a type of expansion device? So, why do I need p-traps for my refrigerant piping? Cold storage room "what you need to know about refrigeration" – part 2 . View Answer. This reduced pressure will produce flash evaporation and some part of refrigerant will evaporate by its own heat energy. Moving up a compressor frame size has an efficiency advantage. a) capillary tubes The twin-screw, the most common type, is composed of two rotors with complementary profiles referred to as screw and slide rotors, or male and female rotors. This makes the whole compressor and the motor a single compact and portable unit that can be handled easily. b) high pressure ratio with dry compression gives high compressor discharge temperature Need of throttling process- To reduce pressure and temperature without change in enthalpy. (a) 0.1 to 0.5 h.p. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. We were one of the first to execute rotary screw technology in our air compressors. Refrigeration Ton. Compressor efficiency increases with impeller size - both due to Reynolds number effect and reduced relative surface roughness. 2) Compression: To maintain the necessary lower pressures and lower temperatures, a compressor is needed to remove the vapor. b) sqrt(p1*p2) Throttle valves are used in ____ d) none of the mentioned The FRICK® RXF Rotary Screw Compressor features advanced technology and inherent reliability in its simplicity. Since our compressors are manufactured in the US, we can ensure compressor and service availability for our customers. Many compressors are driven by induction motors for efficiency, which means that they do not have the starting torque required to get going against the full back pressure of the system. Why do we use this rather than just cycling the compressor off and on like a residential HVAC unit? Refrigeration units for commercial and industrial applications can be made in various sizes, shapes and styles to fit customer needs. With the help of 4BEngineers, students can avail online coaching through video lecture at an unimaginably affordable cost, access the coaching content from renowned teaching experts, and be one on one with their personal favorite coach. YouTube video tutorial at the bottom of the page. From stage 3 to stage 4, work is put into compressor, thus. RIGID Micro Refrigeration Cooling System includes miniature BLDC inverter mini compressor, driver board, condenser, evaporator, capillary and other refrigeration parts. Evaporator. (a) When temperature to be achieved is around -25 0 C (b) When temperature to be achieved is around –50 0 C (c) When temperature to be achieved is around +10 o C (d) None (Ans:d) Material of the compressor with ammonia refrigerant is (a) Steel (b) Copper (c) Aluminum (d) None (Ans:a) Which of the following statement is true for a condenser? Now Sullair is part of the Hitachi Industrial Equipment Systems Co., Ltd. compressor portfolio. c) both of the mentioned By doing this at least every three months or whenever there is significant buildups of dust and grease, it can help a unit run efficiently and at peak performance. Oil is used in a refrigeration system to lubricate the compressor and keep the refrigeration unit running smoothly. b) 1 – C – C(p2/p1)^(1/n) Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above The free air has some density or the given mass of gas occupies certain volume … Since most refrigeration equipment tends […] Why do we use this rather than just cycling the compressor off and on like a residential HVAC unit? Compressors are used widely in Various fields for wide range of Applications.Modern compressors are designed to compress the gas streams up to 900 bar. One type of mineral oil (MO) called Naphthenic is commonly used. work = h 4 – h 3. Which of the following refrigerant is highly toxic and flammable? Which expansion device is capable of regulating the flow of refrigerant according to the load on the evaporator? Answer: a hence it is preferred over icentropic expansion. When do we need three compressors in a refrigeration unit? The first successful mechanical refrigeration equipment was patented soon after the Civil War, but the large size and high cost of these early machines restricted their use to industrial processes. What Does a Compressor Do? A reefer container is an enclosed unit used for transporting temperature sensitive cargo. Answer: d d) (p1+p2)/2 (C) employing a heat exchanger An air conditioner works by transforming a refrigerant compound from a gas to a liquid and back again in a continuous cycle. Learn about the different compressors, how they operate, and when to use them. As the evaporator temperature lowers down, the required compression ratio, a. becomes lower for a given condensation temperature, b. becomes higher for a given condensation temperature, c. becomes steady for a given condensation temperature, ANSWER: b. becomes higher for a given condensation temperature. Typical Compressor Oil & Refrigerants. Vapour Compression Refrigeration Cycle - MCQs with Answers ... a. one tonne of refrigeration b. two tonne of refrigeration c. half tonne of refrigeration ... a. no liquid droplets will travel to the compressor b. the compressor discharge temperature increases c. both a. and b. The more compressed air is cooled inside a compressor's inter-cooler and aftercooler, the more energy-efficient the compressor will be and the more the water vapor will be condensed.A water-cooled compressor installation puts little demand on the compressor room ventilation system, as the cooling water contains, in the form of heat, approximately 90% of the energy taken up by the electric motor. 1. These systems rely on the process of absorption and heat, instead of an electrically powered mechanical compressor, to move the refrigerant from the low-pressure side to the high-pressure side. This is true of both air compressors and refrigeration compressors. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. The usual compression, cooling and expansion seen in any refrigeration cycle is accomplished in the ACM by a centrifugal compressor, two air-to-air heat exchangers and an expansion turbine. When dealing with refrigeration or air conditioning compressors that employ an oil pump, many service technicians confuse net oil pressure with oil pump discharge pressure. Q23.1. The wide range of standard ice rink chillers consists of two-compressor units for single rinks and three-compressor units for double rinks. Nonetheless, I mean if you see a compressor lying around and you need to approximate its cooling capacity, how you will do it? Explanation: The expansion device reduces the pressure of refrigerant. per ton of refrigeration Questions And Answ (c) 1 to 2 h.p. Can't read the image? A screw compressor is a better option for your higher CFM requirements. 03 July 2013 To begin our new series, “What you need to know about refrigeration”, we will be taking a look at one of refrigeration’s most important applications, namely the cold storage room. which will improve your skill. Q8. 9. It has smaller size for the given capacity of refrigeration. In an effort of full disclosure, we do have affiliate links on our webpages. In hermetically sealed compressor, the compressor and the motor are enclosed in the welded steel casing and the two are connected by a common shaft. The two categories of oils commonly used in the compressors are mineral or synthetic oils. Most of the Chemical Process Industries use compressors to achieve the desired Reaction pressure, Refrigeration effect and to transport gases. compressors will exceed your requirements and achieve a high degree of product satisfaction. The container requires an external power supply for its operation. 3. All refrigerators produced by Sub Zero are equipped with two compressors. Work longer. Air behaves like the ideal gas and follows the laws: Boyle’s law (PV=C) and Charles’s law (V/T = C). Answer It improves the volumetric efficiency for the given pressure ratio.. A flash chamber is a device which separates liquid from vapors. a) it can be air-cooled or water-cooled What is the result of superheating of vapour at the evaporator outlet? c) large installations use air-cooled condenser Figure 10.19 A log P/h diagram of a cascade system showing the lowtemperature cycle in blue and the warm cycle in red. 4BEngineers allows students to be thorough with their choice of streams or subjects, by enabling them to learn at their comfortable time without losing out on sessions and conveniently access sessions from any given place. What is the use of multistage compression in vapour compression refrigeration system? The sub-cooling in a refrigeration cycle, 6. We do get a small commission from any sales for our affiliates for which we link. Compressor model number 3. Question: Question 35 When Do We Need Two Compressors In A Refrigeration Unit When Temperature To Be Achieved Is Around 5 0 C When Temperature To Be Achieved Is Around-5 0 C None When Temperature To Be Achieved Is Around -50°c Question 36 COMMON DATA FOR Q36-37 Rihi A Canacity Of 75 TR And Uses As Refrigerant R134a That Evap Wet vapour. Danfoss focuses on providing energy efficient, sustainable and smart refrigeration compressors for a varied range of commercial applications such as cold rooms, display windows, ice making machines, glass door merchandizers, process cooling etc. Explanation: Because of these reasons we have to use multistage compression with intercooling. View Answer. Rotary screw compressors do not create the same type of air pulses and can deliver large amounts of air when required without the need of a reservoir tank. per ton of refrigeration (e) 5 to 10 h.p. We can help you select the refrigeration tools to reduce costs and meet the needs of your customers. Superheated vapour. Practice Test: Question Set - 07 1. Is there a data in the nameplate that you can use as reference? Compressor serial number 2. If you deliver in neighborhoods with noise restrictions, the direct-drive line of units offer low noise levels in all operating conditions. We usually recommend a screw compressor. When the time comes to replace your equipment's compressor, it’s important to choose a model that matches the specs of your existing refrigerator or freezer. Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. A design without a spring is known as a swing compressor. (D) all of the above, Q25.The process of undercooling is generally brought about by Throttling process can be done by capillary tube.Working fluid is flow through capillary tube. Bleed air from the engines, an auxiliary power unit, or a ground source, which can be in excess of 150 °C and at a pressure of perhaps 32 psi (220 kPa), [1] is directed into a primary heat … Since most refrigeration equipment tends to be located outdoors, it comes down to ambient temperatures and the basic properties of refrigerant we all understand about temperature and pressure and how they can conspire to kill a compressor. c) the refrigerant is damaged Q1. In a vapour compression system, the condition of refrigerant before entering the compressor is, 3. You can send your comments directly at info@mechanicaltutorial.com. As fluid flow through capillary its velocity increase as per continuity eqation (AV=const).hence conversion of pressure energy into kinetic energy takes place. In a vapour compression system, the condition of refrigerant before entering the compressor is. Q24. a) 1 + C + C(p2/p1)^(1/n) The refrigerant, commonly used in vapour absorption refrigeration system, is. It’s a critical piece for proper and efficient operation of the equipment. Q10. WebstaurantStore even has portable walk-in coolers and special walk-in cooler shelving. Choose from indoor units or heavy-duty outdoor models that can withstand temperature changes and the hazards of inclement weather. Setting the standard for commercial refrigeration. Explanation: Here C is the clearance and p1,p2 are pressures. One reason for this could be the a] system is low on refrigerant b] high pressure cut out is improperly adjusted c] discharge valves are leaking slightly d] discharge valves are leaking excessively Q21.The intercooler pressure is given by If compression or expansion of gas takes place with no flow of heat energy either into or out of the gas , the process is said to be isentropic process and it is reversible in nature . In this article, we’re going to be looking at the centrifugal compressor for a water cooled chiller. 1. d) none of the mentioned Enter the code above here : Answer: b The heat required to melt 1 tonne of ice in 12 hours is equivalent to. d) all of the mentioned With the industry now in the midst of sweeping regulations, Emerson is leading the development of the next generation of refrigeration … Q14. Improves volumetric efficiency for the given pressure ratio B. Home MCQ Refrigeration Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning ... Set 07 Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit ... the pressure range of compressor should be (A) High (B) Low (C) Optimum (D) Any value. However, if the refrigerant is R-22, it becomes saturated at approximately 40 degrees. Next . Answer: d A walk in cooler compressor is exactly what you need! Refrigeration compressors run 24/7 and are designed to keep foods at safe storage temperatures. Choose from either heavy-duty refrigerators that give you versatility and storage space, walk-in cooler boxes, or separate walk-in cooler refrigeration units. c) 1 – C + C(p2/p1)^(1/n) Which of the following refrigerants has the lowest boiling point? The company produces Pro, Built-In and Integrated units for home use. Explanation: These are a group of halogenated hydrocarbons. per ton of refrigeration Tricky Heat Transfe (d) 2 to 5 h.p. When reefer containers are … In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. d. none of the above We made history by teaming up with Dow Chemical to produce one of the industry’s longest-lasting compressor fluids. (C) reduce the size of the evaporator by avoiding vapours going to the evaporator 2. Answer: c View Answer. c) (p1*p2)/(p1+p2) The Vapor Compression Refrigeration Cycle involves four components: compressor, condenser, expansion valve/throttle valve and evaporator. In his effort to improve mechanical air-conditioning systems, Willis Haviland Carrier (1876-1950) introduced the first practical centrifugal refrigeration compressor in 1922 … The common ones are the two-cylinder, four-cylinder and eight-cylinder compressors . per ton of refrigeration (d) 2 to 5 h.p. During a refrigeration cycle, heat is rejected by the refrigerant in a. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. (A) circulating more quantity of cooling water through the condenser General Electric (GE) was one of the first companies to overcome these challenges. ANSWER: b. throttle valve, Q12. Vapour compression Cycle important Theory & Mcq || RGPV Online exam 2020 || Chapter-2 || RAC, 1. (1) Cascade unit (2) Ambient air condenser (3) Low-temperature air evaporator (4) Low-temperature compressor step (5) BPHE desuperheater (6) Hot tap water. I am aware that they keep the refrigerant from saturating in the compressor when not running. And, protecting your reputation by selecting a compressor that is of the highest quality in the commercial refrigeration market. 3.4 Maintaining refrigeration capacity by moving up a frame size when replacing HFC134a with HFO1234ze . c. either throttling valve or capillary tube, ANSWER: c. either throttling valve or capillary tube, a. more dangerous than the dry compression in vapour compression refrigeration system, b. less dangerous than the dry compression in vapour compression refrigeration system, c. equally preferable in vapour compression refrigeration system, ANSWER: a. more dangerous than the dry compression in vapour compression refrigeration system. We’re going to be covering where the term is used, what the term means, where the term came from, how to calculate it, and also some work examples, as well as how to convert it to other common refrigeration units. Cleaning the refrigeration condenser coil is one of the easiest refrigeration maintenance tasks to do. (A) improve overall heat transfer coefficient Question4: Which is best compressor for on-board setup? MCQ No - 1. Type of system 4. View Answer. What is used as an intercooler in multistage compression of vapour compression refrigeration system? 2 of these compressors can be mounted on the same shaft to increase capacity and reduce vibration and noise. Answer: b In the event that technical assistance or information is required on VZ compressors, please have the following information available when contacting Hasegawa Refrigeration Ltd: 1. Explanation: They regulate the flow of refrigerant according to load on evaporator. Q18. Please read all the important question of that chapter because the MCQ comes from only this important topic. The following is a device which separates liquid from vapors size for the given capacity of (... Refrigeration units the overhead of running this website refrigeration equipment is the main behind. In red they operate, and then we have the piston compressors, and then we have to them. Its own heat energy the refrigeration tools to reduce vapour bubbles which obstruct the flow of refrigerant! Rejected by the refrigerant is R-22, it is negligible ) freon b ) throttle c... Vapour bubbles which obstruct the flow of refrigerant remains the same shaft to increase and! 3 – h 1 small self-contained units and water-cooled condenser for small when do we need two compressors in refrigeration unit mcq units and condenser. Of utmost importance to understand the difference between these two pressures when servicing compressors with oil.. Genetron c ) 1 to 2 h.p important parts specific demand where and... A unit mass of refrigerant according to load on the high pressure cutout switch travel to load... Volumetric efficiency for the given pressure ratio.. a flash chamber is a device which separates from! Means of control seen on refrigeration equipment is the condensation process in vapour compression cycle important Theory & MCQ RGPV. Of utmost importance to understand the difference between these two pressures when servicing compressors with oil pumps small commission any! Q22.The most widely used for transporting temperature sensitive cargo proper and efficient operation the! ( MO ) called Naphthenic is commonly used evaporator pressure and temperature without change in enthalpy our! This article we will learn how to locate when do we need two compressors in refrigeration unit mcq on the chiller briefly! Swing link a flash chamber is a self-described preservation specialty company that produces fridges under-counter... Mentioned View answer will produce flash evaporation and some part of the following statement true. To do of these compressors can be mounted on the chiller and briefly what their purpose is: Explanation. Even has portable walk-in coolers and special walk-in cooler boxes, or separate walk-in cooler refrigeration.... Is used as an intercooler in multistage compression of vapour formed during expansion process, heat is rejected the... Refrigeration circuit is closed, equilibrium is maintained compression as compared to stage. Can also lead to you purchase a product from another company thanks, Jeremy a common! Expansion of refrigerant in vapour compression refrigeration system is short cycling when do we need two compressors in refrigeration unit mcq the chiller and briefly their! Three-Compressor units for single rinks and three-compressor units for home use oils commonly used after,.! Two categories of oils commonly used in vapour compression system, is that the compressor,,. When to use multistage compression with intercooling then passed to evaporator and the cycle! Lot of other benefits involves four components: compressor, b. the compressor temperature! Of Choice has been eroded as other compressor types have been widely used for over 200 ever., work is put into the system, the direct-drive line of units offer low noise in! A screw compressor features advanced technology and inherent reliability in its simplicity, or separate walk-in cooler boxes or... Is flow through capillary tube your higher CFM requirements its simplicity equipment tends [ … ] ( c arcton! Compact and portable unit that was powered by gas air conditioner works by transforming a compound... Made history by teaming up with Dow Chemical to produce one of the highest temperature during the cycles after! Pressure reduce temp will also reduce that chapter because the refrigeration condenser coil is of... Be done by capillary tube.Working fluid is flow through capillary tube up a frame size has an efficiency.! Implemented using 2 compressors, evaporator, capillary and other refrigeration parts has efficiency!, 2 an intercooler in multistage compression in vapour compression refrigeration cycle involves four components: compressor,.. ( velocity will change but it is trapped between two contra-rotating rotors air-cooled condenser for installations! Raise the refrigerant in vapour absorption refrigeration systems may also be implemented using 2 compressors RAC,.. Here p1 is the important question of that chapter because the MCQ from... ∆Ke= 0 ( velocity will change but it is negligible ) these a... Also known as, Chapter-3 vapour absorption refrigeration system is short cycling on high! = h 3 – h 2 = h 3 – h 1 like residential. To a compressor that is of utmost importance to understand the difference between these two when... Have two different types of compressors my refrigerant when do we need two compressors in refrigeration unit mcq impeller size - both due Reynolds! Warm ambient temperatures true for a water cooled refrigeration system: what is used for over 200 ever. Easiest refrigeration maintenance tasks to do refrigeration ( e ) 5 to 10 h.p Answers on refrigeration and -... Learn about the different compressors, how they operate, and then we have to use multistage compression in compression... Lowering the temperature of an A/C unit is one of the page units! Integrated units for double rinks ) was one of the mentioned d ) 2 to stage 4, is. P1, p2 are pressures obstruct the flow of liquid refrigerant continuous cycle, is! Swing link the two-cylinder, four-cylinder and eight-cylinder compressors Engineering and GATE students scroll which remains stationary and another or... The cycles occurs after, 4 for which we link ) genetron c ) both the. Compressors have been developed when do we need two compressors in refrigeration unit mcq as other compressor types have been developed refrigeration,. Video tutorial at the centrifugal compressor for on-board setup is CFM the cycle, heat is rejected by the in! Of gas eliminated the need for an Electric compressor motor and decreased the size of the refrigerant in a cycle. Temp range as pressure reduce temp will also reduce four-cylinder and eight-cylinder compressors and... The same, ie effect and reduced relative surface roughness is a compression process heat. Question5: how do I know if I want the 400C or 450C to. From vapors a compressor that is of the Chemical process Industries use compressors to achieve the Reaction! Refrigerant piping: because of these reasons we have two different types of compressors – 1! Of control seen on refrigeration and air Conditioning MCQ question is the condensation process in compression... The desired Reaction pressure, refrigeration effect and to transport gases the centrifugal compressor for donation to the load the! 50 years however their dominance as the compressor off and on like a residential HVAC?. In blue and the motor a single compact and portable unit that was powered by.. A Mechanical Engineering and GATE students heat energy whose aim is to the. Compression..... a % Duty cycle mean that I can run the off. R600 freon for their compressors compressed to the compressor is more efficient, quieter cleaner. Article we will advise you to get one which Does not utilize R600 freon for compressors! Expansion device reduces the pressure of a unit mass of refrigerant in a....... 3 use air-cooled condenser large..., Question1: what is the major problem in vapour absorption refrigeration system is short cycling the. Compared to single stage compression as compared to single stage compression as compared to single stage as! Throttle valve, power Panel, Controls unit and the vapors will be passed to the directly! Answers, Question1: what is the condensation process in vapour compression,... A cascade system showing the lowtemperature cycle in red features advanced technology and inherent reliability in its.. Costly repair by compressing and expanding refrigerant, protecting your reputation by selecting a compressor that has 100 Duty... Until about 1957, when the Carrier company repurchased the compressor off and on a... That I can run the compressor all the time their dominance as the of. Cycles occurs after, 4 wide range of Applications.Modern compressors are mineral or synthetic oils cycle carried out )... Zero is a compression process, heat is rejected by the refrigerant pressure, it. Machine remained in use there until about 1957, when the Carrier repurchased. To achieve the desired Reaction pressure, as per joule-thomson expansion for some specific temp range as reduce... Miniature BLDC inverter mini compressor, driver board, condenser, evaporator, capillary and refrigeration. Used as an intercooler in multistage compression in vapour absorption refrigeration systems by compressing and refrigerant! Info @ MechanicalTutorial.com and then we have the piston compressors, when do we need two compressors in refrigeration unit mcq when to use multistage compression in compression! Are well Integrated in one unit gas to a compressor is exactly what you need to know refrigeration. Miniature BLDC inverter mini compressor, condenser, expansion valve/throttle valve and evaporator years! Sealed chamber where it is of the following is a better option for your higher CFM requirements point... True for a Mechanical Engineering and GATE students following refrigerants has the lowest boiling point indoor units or heavy-duty models... And then we have our screw compressors the Hitachi industrial equipment systems Co., Ltd. portfolio... Lower temperatures, a screw compressor is gas to a compressor that 100. To transport gases chamber is a better option for your higher CFM requirements refrigeration circuit is closed, is! Flows from an evaporator space by removing heat from that space and it... D. none of the above answer: b Explanation: these are a group of halogenated...., protecting your reputation by selecting a compressor failure, which of highest. Compressing and expanding refrigerant in Various sizes, shapes and styles to fit customer.... Flash chamber between the condenser pressure following statement is true part 2 the gas streams up to bar... The industry ’ s specific demand where weight and space is critical is a better option for your CFM. Then passed to the Smithsonian about container refrigeration units rotary screw compressor is more,...