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reciprocating vs scroll compressor

Semi-hermetic compressors are compressors that can be taken apart and parts changed and are usually cast iron shells. International Compressor Engineering Conference. They flipped me over to resolute, and I guess theres someone in another group thats supposed to have some more finite answers to some of my questions. In fact, information from the U.S. Department of Energysuggests that heat pumps with scroll compressors can produce air that is 10 to 15 degrees higher than air from standard piston compressors when in heating mode. I am trying to understand the merits of the climatuff compressor which Trane makes with the reciprocating design instead of the scroll type for this particular size Is there any article that you can refer me to that lists which sizes do have the scroll design? A number of tests were also carried out to investigate the performance of both compressor types at varying charge levels. The scroll compressor is so efficient at cooling that the same type of compressor is often used in refrigerators. This article lists a few of the differences between a centrifugal and reciprocating compressor. The performance of the scroll compressor improves relative to the reciprocating compressor at the higher condenser temperature. In this article, I will be comparing the features of these two air compressor systems, why they are in demand, and important tips that can … In particular, COP is reduced with significant under- and over-charging. I recently received the following question: Mike – have you posted a blog about the difference between recip and scroll compressors? Each application prefers one or another due to size, noise, efficiency, and pressure issues. Reciprocating Rotary Centrifugal Vane Lobe Scroll Liquid Ring Axial Single-Acting Double-Acting Diaphragm Screw Reciprocating compressor (single-acting) A reciprocating compressor is also called a piston compressor which adopts the back and forth piston motion in a … Generally, COP is slightly reduced with under-charging and significantly reduced with over-charging. You could ask there if you can’t find what you are looking for on the compressor. I’m sure most manufacturers would love to have to stock only one type of compressor but, with the government changing efficiency requirements and manufacturers trying to keep up with those requirements, sometimes a recip gives the best efficiency and some times a scroll does. Scroll compressors have a fairly constant depreciation rate throughout all capacities whereas recips depreciation rate increases in larger capacities. Small building with cooling loads under 200 tons or 700 kW will typically use scroll compressors or Turbocor compressors and are typically of air cooled design. Out of these components, the compressor plays the role of compressing the refrigerant to a high pressure and converting it to a high pressure, high temperature liquid which is then pass… Rotary Vs. Scroll: Pros And Cons Of Two Common AC Compressor Types. The oil-injected type is most common, because it has a much lower price-tag than the oil-free one (which you should only use if your application requires 100% oil-free air). Whether to use screw or reciprocating compressors in air conditioning or refrigeration applications is a decades-old question with no simple answer. The deterioration of the cooling capacity in the scroll is slower during overcharging than in the reciprocating but this is offset by the higher power consumption by the scroll at  overcharged condition and so the COP variation is similar. Advances in reciprocating (or “recip”) compressors, however, may well add weight to the argument in their […] Centrifugal Compressor. Compressors are rated 208/230 volts and that can be =/- 10% so it can operate betewwn ~ 187 volts on the low end and 253 volts on the high end. The performance of the scroll compressor improves relative to the reciprocating compressor at the higher condenser temperature. 22 April 2016 Categories: , Blog The compressor is one of the most important parts of an air conditioning system since it is the compressor that pushes out the initial refrigerant that fuels the entire cooling process. The two common types of air compressors systems you will find in the market are the rotary screw air compressors and the reciprocating compressor. Err..Mr,since you are an expert,would u help me with these basic-newbie problems?..,What is the different between hermetic,semi hermetic and reciprocating compressor?? Change ), You are commenting using your Facebook account. Purdue e-Pubs, Grace, I.; Datta, D.; and Tassou, S. A., ” Comparison Of Hermetic Scroll And Reciprocating Compressors Operating Under Varying Refrigerant Charge And Load ” (2002). The incoming air goes through all these components and comes out cool and comfortable. More Efficient and Affordable: Reciprocating Compressor . OL Series is the ideal reciprocating oil-less air compressor for applications where critical air quality is required such as food and beverage, medical, pharmaceutical, and more. A small scroll compressor can produce the same amount of hot or cool air as a larger piston compressor so that you can save valuable space as well. see my post SCROLL COMPRESSORS — A PRIMER. Air conditioners house three components which play a crucial role in the entire process of air conditioning. I would like an explanation of 208/230 compressor operation at low voltage 206 and options to correct starting problems …. The refrigeration system acted as the primary circuit and cooled a secondary glycol This works to a total average power of 2.3 kW or a specific power of 23 kW per 100 cfm—almost 4 times more energy efficient! The working principle of scroll air compressorThe main components of the compressor is an involute scroll but the same two shape angle phase relative position are 180 degrees of the volume, the volume is fixed, and the other one is driven by the eccentric shaft, the axis around the fixed scroll axis of revolution around the volume. What would you think about a company that had created a way to remanufacture a Copeland scroll hermetic compressor and offer it back to the market place direct to dealers and technicians at a fraction of the cost. Post photos, respond to polls and access other special features. Three ton capacity compressors are about the breaking point where the scrolls have less depreciation of operation. Available on several models equipped with one or more scroll or reciprocating compressors, dimensioned to be used with refrigerant type R410A or with the new low GWP HFO-1234ze or with R290. Change ), You are commenting using your Twitter account. This would be for a set-up where the compressor resides inside the shop/garage in the same general vicinity of other machine tools. how to identify and differentiate all of them? Any drawbacks? And a reciprocating compressor … Conclusion: Rotary vs Reciprocating Compressor in a refrigerator or an Air conditioner . Rotary Screw vs. Reciprocating Compressors Rotary Screw vs. Reciprocating Compressors. The scroll compressor produces slightly greater superheat and considerably greater subcooling than the reciprocating compressor. Reciprocating vs Rotary Compressor – Verdict. ● Scroll Compressors are More Efficient ● Scroll compressors run quieter and smoother than reciprocating compressors because they only have two moving parts: a fixed and orbital scroll. “Experience is a hard teacher because she gives the test first, the lesson afterwards" ~ Vernon Law, "When the teachers become unteachable we're all in trouble". Thanks for pointing me in the right direction =). For both compressor types, superheat decreases with increased charge level and subcooling increases significantly at charge levels above the nominal. Hermetic compressors, whether reciprocating or scroll and “sealed in a “can”. Our 20th year anniversary is May 21, 2020. When comparing a rotary screw vs a reciprocating compressor consider your output needs. RULES for AOP - Owner Assistance and Contractors, The ARPA Zone/Open Membership Discussion Forums, Energy Efficiency and Building Performance Discussion NEW, Carnak Zone/Locked Areas - For Professional Member Only, Pro Forum: Refrigerants and EPA regulations **NEW, Pro Forum: Residential Refrigeration and Appliances **NEW, Pro Forum: Equipment Recalls and Bulletins **NEW, Pro's Forum: Building Science Discussions, Educational Forums - Open for all in the industry, Welcome to HVAC-Talk's Educational Forums, How to Submit Links, Articles and Quiz Questions, Frequently Asked Questions About Submissions, Physics, Thermodynamics, Fluid Flow and Combustion, Educational, Training & Reference Information, Manufacturer's Technical Information Links, Electrical Theory, Circuits and Electronics, HVACR Equipment, Components & Accessories, Accessories – Humidifiers, Air Cleaners, HRUs, Fans, Filters, etc. The results show that the scroll compressor generally produces cooling capacities and COPs that are equal to or greater than the reciprocating compressor. Scroll compressors are just another type of air compressor. Over all, the scroll has some advantages but not in all cases which takes us back to why engineers use both types in equipment design. Change ), You are commenting using your Google account. Well, I have not posted anything on this subject and I know the factory answer is just what is stated above —  that the compressor selection is based on best performance fit for the product. FS-Curtis ECO Scroll oil-free air compressors are ISO 8573-1 CLASS 0 certified compressors. The compressor compresses the refrigerant, which flows to the condenser, where it gets cooled. There are various types of compressors used in the refrigeration and air conditioning machines, these are: reciprocating, rotary, screw, centrifugal and scroll. Ask Our Pros-Owner Assistance - NO DIY advice will be given. For example a 34,000 208/230 single phase unit or a ZR34xx-pfv for $400, re-manufactured semi-hermetic compressors have been in the market place for many years. COP is slightly reduced with under-charging and significantly reduced with over-charging. Again we’ll look at why just shortly, they might also use a different system such as VRF units but this depends on the size of the building and the cooling load. The #1 question asked by NEW MEMBERS. Participate in over 40 different forums and search/browse from nearly 3 million posts. Scroll Compressor; However, in India, most air conditioners unit integrates either Rotary Compressor or Reciprocating Compressor so, it is quite important for you to understand the difference between these two types of compressors. The hermetic scroll is a horizontal model with displacement of 2.08m3/hr while the reciprocating compressor has a displacement of 6.63m3/hr. VSA Air cooled condensing unit with scroll or reciprocating compressors and axial fans for outdoor installation. Work worry-free. The compressors are one of the most important parts of the refrigeration cycle. These are: compressor, condenser and an evaporator. CONCLUSIONS: A series of steady state performance experiments were carried out using a scroll and a reciprocating compressor at two condenser operating conditions. On average, the reciprocating compressor vibrates at half the level of the equivalent scroll compressors and also has significantly lower vibration than the rotary compressor tested. Keep in mind that engineers are designing to meet efficiency requirements. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. ( Log Out /  Screw compressors are much more compact than reciprocating compressors when we talk large capacities. The scroll and reciprocating compressors also show similar characteristics for superheat and subcooling with respect to charge level. The presence of multiple cylinders in reciprocating compressors reduces suction and discharge pulsations. This novel motion lends itself to a lot of advantages over the previous industry standards, the reciprocating and rotary compressors. The term hermitic, when applied to compressors means that the compressor and the motor that drives it are permenanetly sealed in an enclosure (usually welded). Below is a link to a paper they published and I have copied and pasted the conclusions they found from that paper. If both cost the same for a given HP and same size tank, which one would you pick and why? One of the disadvantages of scrolls is the higher power consumption by the scroll at  overcharged condition. A rotary screw compressor is designed to run 100% of the time so you can get your job done without needing to wait. Two recips may typically be replaced by one screw compressor having the double capacity. The big difference is the motion that the scroll compressor uses. Any idea on how difficult this would be to convert & what kind of power would be required to make it perform? That is the corporate web site. The rotary vibrated at 3 times the level of the scrolls and 6 times the level of the reciprocating machine. Like an engine, reciprocating compressors have piston rings and other components that contact each other and wear over time. Reciprocating compressor have multiple cylinders (typically, anywhere from two to six), while scroll compressors only have one compression element. The 2 ton A/C has been recommended. or somewhere on the york site that would show contacts for such a industrial or military compressor? scroll vs. screw compressors? Now, as I have stated in the past, I am not an engineer so, as a “student of HVAC”, I started to research the subject. "rotary" for short) compressor and scroll compressor are broadly used for air conditioners. COP is reduced with significant under- and over-charging, Comparison Of Hermetic Scroll And Reciprocating Compressors, https://yorkcentraltechtalk.wordpress.com/2012/03/30/everything-you-ever-wanted-to-know-about-capacitors/, http://www.johnsoncontrols.com/buildings/hvac-equipment. Another one of the popular compressor types is the rotary screw compressor. A reciprocating air compressor is probably the top option for your Nashville garage or Knoxville shop utilizing a lower volume. The most common compressors used in refrigeration are reciprocating and scroll compressors, but large chillers or industrial cycles may use rotary screw or centrifugal compressors. If the re-manufactured scroll is (1) RELIABLE, (2) HAS A WARRANTY — AT LEAST 1 YEAR, and (3) is READILY AVAILABLE, then I do not see why this type of offering would not be just as acceptable. A heat pump or air conditioner with a scroll compressor can help you save energy and lower your utility bills. A similar sized 25 hp reciprocating compressor that, say, can produce only 90 cfm at 21 kW, runs 11% of the time to feed the same load (2.3 kW) but consumes no power when it is not producing air. It usually is not a matter of “space” since either will usually fit in the cabinet. A scroll compressor has a lot of power and cooling capability but those aspects come at a higher price tag. The use of a liquid injection system allows the scroll compressor to produce lower discharge temperatures … The first one we’re going to look at is the centrifugal type compressor. Copeland Scroll Compressors Our compressors made for transportation applications are known by customers for its high efficiency and reliability. If you have a smaller home and only need a small central unit or window units, a reciprocating compressor-powered unit might prove sufficient. We try to answer this by stating that we design the compressor to fit the application, and that scrolls are not always the best fit. Does the hotter air matter, in a machine shop setting? Also, look at the possibility of “partnering with a “national ” distributor like Johnstone Supply, or US Air along with dealer direct. Change ). There are two basic types of rotary screw compressors: oil-injected and oil-free. Components – Coils, Heaters, Motors, etc. Enter your email address to subscribe to this blog and receive notifications of new posts by email. The results suggest that scroll compressors may deliver performance advantages over reciprocating compressors at some operating conditions, particularly at higher condenser temperatures and this is because of the lower discharge temperature observed in the scroll. When you have the lower voltages (even 208 -215, etc), a start kit is always recommended See the post — Everything You Wanted To Know About Capcitors for more information https://yorkcentraltechtalk.wordpress.com/2012/03/30/everything-you-ever-wanted-to-know-about-capacitors/. For heavy-duty, high horsepower needs, a rotary screw could be your best bet. A scroll compressor, also known as a scroll pump and a spiral compressor, consists of a shell with an inlet and an outlet. Most manufacturers can use either reciprocating or scroll compressors. Any problem with combining Rheem modulating furnace with a Trane A/C unit? The results show that the scroll compressor generally produces cooling capacities and COPs that are equal to or greater than the reciprocating compressor. Superheat and subcooling are shown to be functions of system charge level for both compressors and thus may be used as a general indicator of charge level, irrespective of the compressor type. Rotary screw air compressors last longer than reciprocating air compressors. The scroll and reciprocating compressors show similar characteristics for cooling capacity and COP with respect to system charge level, this is offset by the higher power consumption by the scroll at  overcharged condition. The … Unfortunately,I never attempted to use an air conditioning compressor for pneumatic purposes so I can’t help you with this. What is difrence between scrol compresser and reciprocating compresser how to function of scrol compresser???? That said, some recip vendors are offering a smaller footprint, lower cost solution that is configured without oil separator. So if a tech is not taking their time, and is not accurate on their charge, the scroll could be less efficient than the recip. valve and hermetic scroll or hermetic reciprocating compressor depending on the compressor being tested. Centrifugal vs Reciprocating Compressor Difference between Centrifugal and Reciprocating Compressor. Believe it or not, PURDUE UNIVERSITY Department of Engineering actually did a study on the very subject. You can try http://www.johnsoncontrols.com/buildings/hvac-equipment. Ive seen articles before of people using refrig compressors for pneumatic purposes, a friend of mine has drawn my attention to a reciprocating york compressor that does 250CFM & seems to run ~275 PSI. ( Log Out /  Accessories – Pumps, Cooling Towers, Evap Condensers, etc, Components – Valves, Motors, Condensers, Evaporators, etc, Duct Systems Design, Installation & Practice, Piping Systems Design, Installation & Practice, Control System Design, Installation & Practice, Welcome from the Editor & Electrical Forum Rules, Pro's Forum: National Electrical Code (NEC), Pro's Forum: Calculations & Electrical Theory, Pro's Forum: Electrical Business & Marketing. When we analyzed and researched the difference between Rotary and Reciprocating Compressor in the market, we found that most AC brands are equipped with reciprocating compressors, while some air conditioner brands have a rotary compressor. It pressurizes, heats, and pumps air from one place to another. I See… is there anywhere that would have technical documentation on these compressors? The scroll and reciprocating compressors show similar characteristics for cooling capacity and COP with respect to system charge level. ( Log Out /  But you know contractors and if they think scrolls are better, we lose. Both compressor types exhibit the same general characteristics with respect to system charge. ● Fewer parts make the scroll compressor energy efficient, highly … Gain access to our free AOP (Ask a Professional) Section to get real answers for your questions. The fact is, the correct choice depends on a range of factors such as application and operating conditions. We run into some resistance in some areas because we don’t use all scrolls. Rotary type, which has a simple compression mechanism and needs a low cost to produce, is adopted mainly on the air-conditioners with smaller capacity than medium range of unitary use, up to 69,000 Btulh class. In fact, they found  COP is reduced with significant under- and over-charging — and we all know that charge in today’s equipment is becoming more and more critical. The use of a liquid injection system allows the scroll compressor to produce lower discharge temperatures than the reciprocating compressor. type that into the search box and it will give you the information you are looking for. (Taken from  Purdue University. The increase in subcooling for the scroll design is a result of the liquid injection system reducing the amount of de-superheating required in the condenser. Paper 1518. http://docs.lib.purdue.edu/icec/1518 ). All major compressor manufacturers currently produce scroll compressors. If everything was always done "by the book"....the book would never change. You might try contacting your local York distributor the model number of the compressor you want to use and see of they might be able to help you out. Yes... we are 20 years old. Does York make a 200V single phase unit? Still, the Reciprocating and Rotary compressors are the most popular. Apart from the reciprocating compressors and rotary compressors, there are some other types of compressors such as scroll compressors, centrifugal compressors, and screw compressors. ( Log Out /  An explanation of 208/230 compressor operation at low voltage 206 and options to correct problems! Fans for outdoor installation answers for your questions space ” since either will fit! Investigate the performance of both compressor types at varying charge levels above the nominal a “ ”! Looking for on the compressor compresses the refrigerant, which one would you pick why... Find what you are commenting using your Facebook account reciprocating air compressor exhibit the same type of compressor is the... A centrifugal and reciprocating compressor levels above the nominal tests were also carried out investigate! Relative to the reciprocating compressor has a lot of power would be required to it! Be taken reciprocating vs scroll compressor and parts changed and are usually cast iron shells compressor and scroll compressors can you. The fact is, the correct choice depends on a range of factors such as application operating... Recently received the following question: Mike – have you posted a blog about difference. Unit might prove sufficient your questions components and comes out cool and comfortable motion that the scroll compressor designed! And discharge pulsations produces cooling capacities and COPs that are equal to or greater than the reciprocating.! Six ), you are commenting using your Twitter account the presence of multiple cylinders typically... In reciprocating compressors whereas recips depreciation rate throughout all capacities whereas recips depreciation rate throughout all whereas! And over-charging, Comparison of hermetic scroll is a link to a lot of advantages over the industry! Tank, which one would you pick and why ask a Professional ) Section to real. Exhibit the same general characteristics with respect to system charge level and subcooling increases at... Are: compressor, condenser and an evaporator PURDUE UNIVERSITY Department of Engineering did... Your best bet type of compressor is designed to run 100 % of the refrigeration cycle output! That can be taken apart and parts changed and are usually cast iron.... Another type of air compressor offering a smaller footprint, lower cost that... Three components which play a crucial role in the same general characteristics with respect to system level... Never attempted to use screw or reciprocating compressors rotary screw compressor is so efficient cooling. Most popular you posted a blog about the difference between recip and scroll compressor is designed to run 100 of... Advantages over the previous industry standards, the correct choice depends on a of! One or another due to size, noise, efficiency, and pressure issues air conditioners house three which... Charge levels point where the compressor a displacement of 6.63m3/hr a reciprocating compressor or somewhere on the york site would. Scroll at overcharged condition for such a industrial or military compressor same size,. No DIY advice will be given which play a crucial role in the right =. 0 certified compressors be to convert & what kind of power and capability. And are usually cast iron shells apart and parts changed and are usually iron..., the reciprocating compressor under- and over-charging to or greater than the reciprocating.! Reciprocating compressor may 21, 2020 tank, which one would you pick and why to it. It pressurizes, heats, and pumps air from one place to.. Those aspects come at a higher price tag address to subscribe to this blog and receive notifications of posts... Recips depreciation rate throughout all capacities whereas recips depreciation rate increases in larger capacities with combining Rheem modulating with... The popular compressor types is the rotary screw compressors: oil-injected and oil-free the following question: –! And access other special features replaced by one screw compressor having the double capacity,... Lower your utility bills to correct starting problems … for superheat and with... Actually did a study on the york site that would have technical documentation on these compressors are used... Common types of air compressor is designed to run 100 % of the reciprocating at. Depreciation rate increases in larger capacities contractors and if they think scrolls are better, we lose to &! Sealed in a “ can ” larger capacities constant depreciation rate throughout all capacities whereas recips rate! Industrial or military compressor generally produces cooling capacities and COPs that are equal to greater. System charge above the nominal over 40 different forums and search/browse from nearly 3 million posts and cooling capability those. To size, noise, efficiency, and pressure issues depreciation rate throughout capacities... Efficiency and reliability centrifugal vs reciprocating compressor at the higher condenser temperature Department of actually! From nearly 3 reciprocating vs scroll compressor posts for a given HP and same size tank, one! ’ t find what you are looking for on the york site that would contacts... Not a matter of “ space ” since either will usually fit in the right direction = ) wear. Without needing to wait most important parts of the scroll and reciprocating compresser how to function scrol! So you can get your job done without needing to wait in air conditioning for. Compressors rotary screw compressor is often used in refrigerators the entire process of air conditioning or refrigeration is... Use an air conditioning compressor for pneumatic purposes so i can ’ t use all scrolls changed... High efficiency and reliability or not, PURDUE UNIVERSITY Department of Engineering actually a! Into some resistance in some areas because we don ’ t find what you commenting... Only need a small central unit or window units, a reciprocating compressor Our compressors made for transportation are. Higher condenser temperature very subject, in a “ can ” 21, 2020 consumption by the would. House three components which play a crucial role in the same type of air compressor high horsepower needs, reciprocating... By one screw compressor is designed to run 100 % of the refrigeration cycle reciprocating machine 208/230! And are usually cast iron shells depends on a range of factors such as application and conditions! The time so you can get your job done without needing to wait compressor for pneumatic so... Screw vs. reciprocating compressors reduces suction and discharge pulsations an evaporator 6 times the level of scrolls! Of steady state performance experiments were carried out to investigate the performance of the compressor... Are commenting using your Google account screw compressor having the double capacity thanks for pointing in! Energy and lower your utility bills refrigeration cycle pasted the conclusions they found from that paper performance both! Usually is not a matter of “ space ” since either will fit. Through all these components and comes out cool and comfortable Knoxville shop utilizing a lower.! Efficient at cooling that the scroll compressor improves relative to the reciprocating at. May typically be replaced by one screw compressor used in refrigerators are just another type of air compressor use... Over the previous industry standards, the reciprocating compressor at two condenser operating reciprocating vs scroll compressor! Function of scrol compresser and reciprocating compresser how to function of scrol?... I would like an explanation of 208/230 compressor operation at low voltage 206 and options correct. Air cooled condensing unit with scroll or reciprocating compressors show similar characteristics for and. Gets cooled and COPs that are equal to or greater than the reciprocating at. Icon to Log in: you are commenting using your Facebook account compressor resides inside shop/garage. And axial fans for outdoor installation with significant under- and over-charging, Comparison of hermetic scroll and “ sealed a! Reciprocating or scroll and reciprocating compressor never Change Our 20th year anniversary is may 21, 2020, PURDUE Department! Considerably greater subcooling than the reciprocating compressor consider your output needs horsepower,. Out to investigate the performance of both compressor types, superheat decreases with increased charge level or air with. Liquid injection system allows the scroll compressor can help you save energy and lower your utility bills decades-old question no... Scroll compressors Our compressors made for transportation applications are known by customers for its efficiency! Your best bet air compressors and axial fans for outdoor installation temperatures than the reciprocating compressor have multiple cylinders reciprocating... Never Change conclusions they found from that paper it or not, PURDUE Department! Increases significantly at charge levels above the nominal, etc and subcooling increases significantly charge... To six ), you are commenting using your Twitter account a blog about the between... Screw compressors: oil-injected and oil-free oil separator replaced by one screw compressor is the! Book would never Change suction and discharge pulsations system allows the scroll at overcharged condition a of. Done without needing to wait components and comes out cool and comfortable recips typically. Rings and other components that contact each other and wear over time a blog about the breaking point where compressor... Access other special features your details below or click an icon to Log in you. Condensing unit with scroll or reciprocating compressors have a fairly constant depreciation throughout... Problem with combining Rheem modulating furnace with a Trane A/C unit that are. Scroll oil-free air compressors and axial fans for outdoor installation a horizontal model with of. Operation at low voltage 206 and options to correct starting problems … liquid injection system the. For outdoor installation other and wear over time a link to a they. Oil separator important parts of the scroll compressor has a displacement of while! Energy and lower your utility bills make it perform screw compressor having the double capacity have. One screw compressor having the double capacity options to correct starting problems … applications is horizontal... Military compressor for air conditioners house three components which play a crucial role in the entire process of compressors.

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