The first thing to consider is what will be moving through the blades. Both a larger fan and a better aerodynamic shape have cost and strategic implications to fan manufacturers and their customers. The more abrasion the quicker it will fail, but this fan can move essentially anything. endstream Sorry, there was a problem submitting the form, NMB Technologies is a Great Place to Work, Fan Efficiency, and Increasingly Important Selection Criteria, Positive static pressure is created as a fan moves air through a system. What is the reason for the vibration of the energy-saving centrifugal fan? 0000063744 00000 n
See our privacy policy for information on personal data security. wg Most commercial fans also consume their initial cost in energy expense in less than 1 year. Table 1 illustrates this point. How to improve the efficiency of centrifugal fans? The good news is that compliant fans are available in production today. Motor Efficiency OR Tags About Cement Technology You can get all the latest update related cement industry interm of designing, operaion and maintenance. Based on total pressure, the total efficiency of a fan is calculated. % The total pressure is used since it represents the total energy given to the air. Both Static and Total Efficiency can be calculated from fan performance data as follows: Where: CFM 3= Fan flow rate, ft /min Ps = Static pressure, in. = overall efficiency. <> stream Figure 1: Pressure vs. Flow Curve 120mm Axial Fan. hb```c``"02 P=3;00]d@ As with any energy converter, efficiency is the ratio of input and output power:-, Fan output power (Pout) or airpower using Metric units is:-, Pout (Watts) = Air pressure x Air flow , Using standard units the formula becomes:-, Pout (Watts) = (Air pressure x Air flow ) / 8.5, A 48V fan drawing 1A working at an operating point of 200 cfm and 0.5 inch H2O, Fan efficiency = 11.76 / 48 = 0.245 or 24.5 %. However, the solution there did Ws . Actually I am not a mechanical and I don't know what is static efficiency. Overlaying the system resistance line on the performance curve shows the high flow fan would achieve the required performance of 110cfm at 0.48 inch H2O. For those outside the fan industry, this may seem like an unreasonable regulatory burden, but not so for those who make, rate, and sell fans. pressure differential, respectively) effectively raise the power input allowed at lower flows and pressures.
(4) In the case of large losses in the centrifugal fan system, it can be considered to increase the guide vanes in the air ducts and elbows to reduce the airflow loss, so as to achieve the purpose of energy saving. Which industrial fan type do you need in your process to achieve both optimal static efficiency and reliable operation? The FEG metric was defined when AMCA published Standard 205 in 2010 . with a fan static pressure of 5.3 in-wg requires a minimum fan static efficiency of 65% to meet the SFP. hb```f````a`{ B@V8!AW'hzqij``{ (:bm,M: \PRDghi~ 0i Positive static pressure is created as a fan moves air through a system. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! P is measured in Watts. When I do (2000*1.547) / 1.1, I get: 2812.73 as my efficiency, which I know is not right. motor. Pressure is an essential concept in fluid science. When a fan does not contain an exhaust duct, static efficiency correlates with power consumption. Manufacturers generally suggest static efficiency as the efficiency value, whereas total. Ch4UG)My:yEKu+C?[tSouS'v>jie5fR&K],MQUi|DVy@e{jBZ7Kda|ZJUA2hzB.c6T]n$nOi;Z6u9acO^%pt6M~XE^b(2mIlzD'.42_[| Lvndry"[yMwLGguvJP'BH]u3C5yF=3%YSJhp67tySa=|v8fU3(s.Ei}vh?9fYZ7m79Xb.#?YB;jbUw{QfY?2QDY=O#K
biA[s !@*x*. c+v}izZv&o>3{HFkk Q4@34U]w&;n;@m7FHYpx_\Bk>#+[lBtuX1$[T1;Pl[`cT6ii+uf|;mq ;rT_3O6#CQ(ne"3,YSMrw1v The radial paddlewheel works because the blades extend right to the hub, so theres no gap like there is in an industrial exhaust air handling or radial tip. is fluid density (in kg/m3) and u is the velocity of flow (in m/s). Static efficiency is the product of the volume and pressure you need in your application divided by the product of the conversion constant and horsepower, as follows: You can use the maximum static efficiency to determine the horsepower you need in your application. Measurement of Static Pressure:This shall be done by using a manometer in conjunction Although the main parameter introduced by many manufacturers to users is static pressure, in actual use, it is more reasonable to express the efficiency of the centrifugal fan by the total pressure efficiency. We expect that the consensus terms sheet will guide DOEs draft of fan-efficiency regulation, to be published very soon. Fan efficiency varies dramatically as a function of aerodynamic loading. We don't save this data. xmHSQ if5#,
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~ ?gl\bO2 If its just moving clean air, why not gain that extra efficiency? FEG is a simple method of calculating the aerodynamic quality of the fan and is based on its maximum total efficiency. If you need immediate assistance, But what constitutes good efficiency? Thermal engineers will often force air through a system using fans to regulate the internal temperatures; however, as the aerodynamic performance increases so will input power. How much energy the fan consumes varies greatly by application and which style wheel you have. A 48V fan drawing 1A working at an operating point of 200 cfm and 0.5 inch H2O Review our. Information collected automatically may include usage details, IP addresses, and information collected through cookies. The peak efficiency of an axial fan typically occurs at a pressure point of 1/3rd the maximum pressure. In simplest terms, if you have a 5 ft x 5 ft x 5 ft enclosure, and a fan that produces 5 CFM, it will likely take 25 minutes for the fan to ventilate the hot air in the enclosure. %PDF-1.5
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There is a complete list of Fan Services on the Linquip website that covers all factory operations. We don't collect information from our users. Copyright 2012 - 2023 | All Rights Reserved Industrial Centrifugal Fan | SEO by Wechat:shore240, Calculation formula and improvement method of centrifugal fan efficiency. For most fluid flow applications, elevation changes are negligible. It indicates how much energy the motor will provide and how much energy the fan will consume given application-specific factors. In this simplified form, Bernoullis equation for incompressible flows becomes: p is the static pressure, and p0 represents total pressure. Power consumption at different air volumes and pressure increases are indicated below: Note! You should consider contributing to our CFE Media editorial team and getting the recognition you and your company deserve. 0000104365 00000 n
So review your application, see what youre moving through the fan, and see if you can increase efficiency from 67 up to 80 percent, for example. Thats because it requires smaller-width, larger diameter fan wheels with tight space between the blades to get the air through the high pressure with low volume. '{D-YM#;?Zbc2nX> g)^~ZE>w:i]lT!%,$>N+yK+G/>@-pNbnq=Vi>FS` 9`JxV5;qn:8';`'j`
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Home > Efficiency Calculation > Fan Efficiency Calculation: Formula & Equation. To notify you about changes to our Website or any products or services we offer or provide though it. What Is Fan Static Efficiency? However, calculating static efficiency only considers static pressure. <> The overall efficiency can be expressed as: = h m v (4) where. calculated. Registration on or use of this site constitutes acceptance of our Privacy Policy. FEI is the ratio of the maximum power allowed by the DOE standard to the actual power of the fan selection at every (any) combination of airflow and pressure rise, rather than at a defined test point or points (such as peak efficiency used by FEG and FMEG or some other defined flow and pressure). The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. This new approach will be transformational to model codes and standards for energy efficiency including ASHRAE Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings, ASHRAE Standard 189.1: Standard for the Design of High-Performance Green Buildings, and the International Energy Conservation Code. The higher the volume relative to static pressure, the more likely it is that you can select a high-efficiency fan. The figure below shows the different fan performance curves in terms of airflow. WG. This represented 46% of the United States market in the regulated range. Negative static pressure is what all other components in the airflow path create as they resist air movement. Static Efficiency - Fan efficiency based on static pressure and fan brake horsepower at the same density. A high-end rack system may require more than 25% of the total power budget for cooling fans. 0000003570 00000 n
Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. On larger fans, the smallest dimensions such as material thicknesses and clearances between parts can be held tightly in proportion to the other dimensions, but not so for smaller fans. The conventional airflow, pressure, and input power as measured by AMCA Standard 210 are used to compute the overall efficiency. It is mandatory to procure user consent prior to running these cookies on your website. In general, outlet velocity pressure does not influence a fans capability to dissipate heat energy from a system, so it is not considered in the efficiency calculation. The ventilation system is also an important factor that directly affects the efficiency of the centrifugal fan, so the centrifugal fan can be fully utilized by optimizing the existing system. That is why the DOE regulatory standard must be applied to any and all operating conditions. The Role of Fan Efficiency in Achieving Energy Reduction Goals. A few percentage points improvement in the efficiency of every fan installed can quickly represent many thousands of dollars in annual energy savings. D[Trk8X LX' It may be possible to downsize power supplies in order to save weight and space and lower the power distribution network for fans. For example, lets say our clean application specifies the same 10,000 CFM of volume at 10 inches WG static pressure we used above. 0000003683 00000 n
Fans with high efficiency can be more expensive than older types, which may act as a deterrent. You can target the Engineering ToolBox by using AdWords Managed Placements. The total pressure is the summation of static pressure and outlet velocity pressure. Therefore, it is necessary to choose more advanced and efficient fans. Q dot is 2000 cfm and Wsh is 1.1 hp. If unsure of the particulate size, and you want a bit more safety, consider the following fan types: For heavier material handling of more abrasive material (for example corn husks, manure, paper trim, aluminum chunks, etc.) Clean air allows both for the most choices and the most efficient fans. lB3kb+u1+aggt>! Senior Application Engineer Chet White explains how to calculate static efficiency and why it matters in this 2-minute whiteboard tutorial. endstream
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H 2 O static pressure, the required static efficiency for an unducted fan would be: required efficiency = 60% (10,000 [250 + 10,000]) (3 [0.40 + 3]) = 52% In this case, any unducted fan with a static efficiency of 52 percent or more at this operating point would be accepted. It is important to distinguish between static pressure and dynamic pressure when discussing pressure in fluid dynamics; static pressure is the same as the pressure at any point in a fluid flow field. The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. 0000001569 00000 n
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The efficiency of the centrifugal fan refers to the ratio of the active power of the conveyed medium to the motor power, and its calculation formula is as follows: =kPQ/N In the formula: is the efficiency of centrifugal fan (%); k is the compression factor, usually 0.99; P is the pressure of the centrifugal fan (Pa); In any other way we may describe when you provide the information. As a general rule, fan efficiency increases with blade diameter and speed. The efficiency of each installed fan can be improved by several percentage points, resulting in energy savings of many thousands of dollars each year. Fan Efficiency 4. Large data centers can contain tens of thousands of servers with anywhere between 10 and 50 fans in each. wg). In the example shown below, (Fig. The air power divided by the fan input power is how fan efficiency is calculated. Outlet velocity pressure does not contribute to a fans ability to remove system heat energy; therefore its not normally included in fan efficiency calculations. FEI is the ratio of the maximum power allowed by the DOE standard to the actual power of the fan selection at every (any) combination of airflow and pressure rise, rather than at a defined test point or points (such as peak efficiency used by FEG and FMEG or some other defined flow and pressure). Save my name, email, and website in this browser for the next time I comment. The simple answer is that for main surface fans it is fan static pressure (FSP) that should be employed. When you know your process involves light particulate, you do have a few other options like the industrial exhaust air handlers and radial designs. please call 248-919-2250. Efficiency reaches its highest level at the peak of the bell-shaped curve of efficiency. where the fan includes a variable speed drive, calculate the overall efficiency using the following equation: e = (P u (s) /P e) C c where: h e is the overall efficiency P u (s) is the fan gas power when it is operating at its optimal energy efficiency point This includes information provided at the time of subscribing to our service or requesting further services. By using this website, you agree to our use of cookies. An NMBTC representative will get back to you within one business day. The pressure and flow constants in the FEP formula correctly represent the actual map of efficiency degradation exhibited by the most efficient aerodynamic fans available as flows and pressures decline. FEG63 fans could consume less power than FEG71 fans at a given point of operation (CFM and pressure) simply because they are selected closer to their peak efficiency point. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Volume is the quantity or velocity of air, gas, and/or other materials moving through the fan as measured in cubic feet per minute (CFM). Efficiency advocates and AMCA jointly recommended that DOE establish target efficiencies such that the weighted average noncompliance rate of fan selections sold in 2012 is no greater than 25%, and the noncompliance rate of selections in the following categories does not exceed the values listedbelow: AMCA provided the Lawrence Berkeley National Lab-which analyzed data for the DOE-with a database of 1.3 million fan selections that were sold in 2012. Based on Bernoullis equation, the concept of total pressure and dynamic pressure is important in understanding the behavior of fluids. Under the terms sheet resulting from a public DOE-sponsored Appliance Standards Rulemaking Federal Advisory Committee (ASRAC) negotiation, the DOE is expected to adopt a new fan-efficiency metric called a fan energy index, or FEI. Outlet velocity pressure does not. Every fan can be both very efficient and very inefficient, depending on what flow and pressure at which it operates. Pin = 48 x 1 = 48 W Click here to take a four-week course on commercial and industrial fan efficiency. Coupled with the advent of equipment efficiency legislation and a growing awareness of cost of ownership, fan efficiency is becoming a critical selection parameter. To fulfill any other purpose for which you provide it. Already a member? The overall efficiency is the ratio of power actually gained by the fluid to power supplied to the shaft. A conversion constant is a number used to normalize equations containing varied units of measurement, in this case, CFM and in. We expect that the DOE regulation will require that FEI ratings must tie to FEP levels that are certified by the manufacturer to DOE. This renders the traditional regulatory approach ineffective. Pout (Watts) = (Air pressure x Air flow ) / 8.5 If you need immediate assistance, please call 248-919-2250. 9 0 obj The importance of fan efficiency in the reduction of energy consumption has been discussed in the following PDF. Table 1: Axial Fans Typical Peak Efficiency, Fan Selection Taking Account of Efficiency. HW]o}/-s8, cgS f>4E1&GI{(}(D29s?s)]z_;_w Static Pressure - Sum of all the system resis-tances against which the fan must work, expressed in inches of H2O. The long term benefit of specifying high-efficiency fans is a reduction of ownership costs. xoE}R !i;N8MZPe+*Q":
\6x.IZ,p])bK2;'GUB However, comparing this fan efficiency at the operating point against an alternative lower free airflow fan design, it can be seen the second design would actually provide higher efficiency while still meeting the duty point. Fan Power Calculation You can calculate the fan power consumption with following input data 1. But opting out of some of these cookies may affect your browsing experience. Google use cookies for serving our ads and handling visitor statistics. In total pressure, the static pressure and velocity pressure are added together. Here is another way to think of this: A fan running at 0.2-in. hbbd```b``z"ki >&+A$s9XMX$,f+@^DJcLAj0
@ sp? <> stream The ideal power consumption for a fan (without losses) can be expressed as, Pi = dp q (1), dp = total pressure increase in the fan (Pa, N/m2), q = air volume flow delivered by the fan (m3/s). Negative static pressure is what all other components in the airflow path create as they resist air movement. 0000008520 00000 n
0000062630 00000 n
In the same application, if you selected a less efficient fan with only 50% static efficiency, the calculation would indicate 63 HP, so youd have to bump all the way up to a 75 HP motor to drive it. endobj 0000014712 00000 n
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Consequently, the FEG metric is often misconstrued for many types of fans. Directly from you when you provide it to us. is the efficiency of centrifugal fan (%); )FOymEgyx4Li vQpDCF>O5jdE xo/# Our most efficient wheel, a backward-curved fan, can achieve 77-80 percent static efficiency. The final rule will become mandatory 5 years after the final version is published However, DOE will invite manufacturers to use the DOE metric and test standard sooner and will accept certifications early (probably in 2017), so the engineers and utility rebate programs may begin to specify DOE-certified efficiency levels 3 to 4 years early. The losses in a pump or fan converts to heat that is transferred to the fluid and the surroundings. H\n@{b/ n EarNJE}0#|wnvihqvox&St}.\5\16?YUGx{)>fS_qm6TK=~Cw)w]i6S_bVq[:6Yp*pj~RYd.[yG~e~E~cNs^yy\0# tz812fOatz8=m6GzGzGzGzGaz^* x=@O' x
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The long term benefit of specifying high-efficiency fans is a reduction of ownership costs. Radial tip with forward-curved (cupped) blades, connect with one of our application engineers, Choosing the Right Motor Speed for Your Industrial Fan, Announcing Another Shipping Lead Time Reduction, On-Time Delivery Tracking: Its About Trust, Application Overview: Fans and Blowers for the Industrial Heating Process. endobj This article discusses fan efficiency in some detail and provides a PDF for more information. For more information on fan static efficiency, check out these additional articles: We welcome comments and questions via our LinkedIn Page, and you can always Contact Us or Request a Quote for more details. The total pressure is the summation of static pressure and outlet velocity pressure. For example, if you have an industrial fan that can achieve 80% static efficiency and youre trying to move 20,000 CFM through 10 inches WG of resistance, a 40 horsepower motor would get the job done. |4ExH\}UZ&2e)-t 2a{?/\&(R{vwDsA3Sd4;q+fE5q\!Yd439)FF>|UTW\WQ]uU_~iPG#D|fujY&
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Fan efficiency = 11.76 / 48 = 0.245 or 24.5 %. NMB Technologies Corporation is a MinebeaMitsumi Group company; the worlds largest manufacturer of NMB. 0000004959 00000 n
where p 1 - p 2 is the static pressure, which is: 1.547 in* wg. =z-Y1$2/GFffYviW'?"M*yHl?B The fan performance curve (seeFig 1) is a representation of the airflow (X axis) that a particular fan type produces to overcome given static pressure values (Y axis). "0y13as`W,&ACQ[:ig`,~Qe`x ` d-
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If there were a gap, the inside edge would wear out and destroy the fan wheel pretty fast. In order to establish acceptable minimum fan efficiency, AMCA International developed an efficiency metric called Fan Efficiency Grade (FEG). For any other purpose disclosed by us when you provide the information. Consulting-Specifying Engineer published the first part in this series in June, which explained the peak-based metrics called fan-efficiency grade and fan motor efficiency grade (FEG and FMEG). Cookies are only used in the browser to improve user experience. Engineers now need to gain an understanding of fan efficiency, balancing it against more familiar metrics such as airflow and noise. (3) For centrifugal fans whose actual operating working point deviates little from the design point, the rotor can be replaced or the blades can be replaced to improve its efficiency. The smaller the fan, the less efficient it is. Minimize the negative financial impact on small-business manufacturers and customers, Facilitate prescriptive efficiency rebates that are effective and easy to administer, Belt-drive centrifugal-powered roof ventilators: 35% of selections, Belt-drive axial-powered roof ventilators: 50% of selections, Belt-drive in-line centrifugal and mixed-flow fans: 40% of selections. The pressure of the centrifugal fan is mainly divided into full pressure and static pressure. Thanks. To fulfill the purpose for which you provide it. These cookies do not store any personal information. Copyright 1998-2023 engineering.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. Click Here to Request a Quotation From Suppliers and Service Providers, Your email address will not be published. Your energy consumption is dependent on the style of fans in your system. Likewise, a system with a 2 in-wg fan static pressure requires a minimum fan static efficiency of only 25%. To carry out our obligations and enforce our rights arising from any contracts entered into between you and us, including for billing and collection. Since then, the AMCA worked to develop a consensus that was acceptable to fan manufacturers and efficiency advocates, which include the National Resource Defense Council, American Council for an Energy-Efficient Economy, Appliance Standards Awareness Project, Northeast Energy Efficiency Association, Southern California utilities, and others. Evase output = Static pressure + (VP 1 - VP 2) x Conversion efficiency. As with any energy converter, efficiency is the ratio of input and output power:- I can get Total efficiency by the datas but Nicotra's main program (ventil) usually gives that data too. However, calculating static efficiency only considers static pressure. AirPro Fan & Blower Company 1.95K subscribers Subscribe Like Share 4K views 2 years ago How to Select an Industrial Fan Visit https://airprofan.com/ - Call. 0000063289 00000 n
0000064147 00000 n
Because airpower is the product of flow and pressure, a fan working in the free air condition (no backflow pressure) has zero pressure and thus is producing no airpower and by definition has zero efficiency. Save my name, email, and website in this browser for the next time I comment. Similarly, a fan in the fully shut off condition (no flow) has zero flow and is also producing no airpower and zero efficiency. The effectiveness of the motor or the drive (belt drive) is not considered. 94 0 obj
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How does it impact your decisions and operations? In addition, in order to ensure that the centrifugal fan meets the needs of energy saving, the fan parameters must be selected reasonably. endobj In total pressure, the static pressure and velocity pressure are added together. A high-efficiency fan will reduce the cost of ownership in the long run. k is the compression factor, usually 0.99; Bureau of Energy Efficiency 94 6.6.5 Determination of Fan Pressure General: Precautions shall be taken so that the measurements of the static pressure on the inlet and outlet sides of the fan are taken relative to the atmosphere pressure. 0000061410 00000 n
Different fan types will generate different airflow values while creating a positive static pressure to balance the negative static pressure caused by system obstructions. The pressure constant solves this issue. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
But for a main exhausting fan the FSP is This pressure is also called stagnation pressure. This approach has the potential for missing significant power savings which could be realized by carefully matching fan efficiency to the system operating point. (Total efficiency in percent should equal "fan power" divided by "motor power"). If you need immediate assistance, A few percentage points improvement in the efficiency of every fan installed can quickly represent many thousands of dollars in annual energy savings. ]8+%C\n+qS)mAZ5BUn)}]Sjr5Ga(m*7$z Accompanying this trend is the need to remove ever-higher levels of heat energy from within those enclosures. Summarize the consensus recommendation that will guide the Department of Energy fan-efficiency rule. As a general rule, successive generations of electronic enclosures such as personal computers, telecommunications cabinets, as well as system routers, pack increasing functionality into smaller and smaller spaces. 54 41
The FEI metric, which applies to fans alone and fan/motor or fan/motor/drive combinations, effectively extends the conventional DOE regulatory approach beyond the fan design to address motor, transmission, variable speed drive, and fan selection. 0000070828 00000 n
How to calculate fan efficiency to be more accurate? If theres mild particulate in the gas or airstream, potential build-up and balance issues come into play, shifting the optimal fan type and efficiency equation. AMCA expects that FEI ratings will become the most common description of fan efficiency in the marketplace, because FEI uses this FEP standard as defined in the first DOE rule as the benchmark against which fan efficiency will be compared forever. Tip Clearance - Distance between the tip Pout = (200 x 0.5) / 8.5 = 11.76 W Information that you provide by filling in forms on our Website. So, the peculiar nature of fan efficiency (which can be nearly anything, depending on conditions) comes with the blessing of fan laws that provide a means to deal with the challenge. Explain the proposed efficiency metrics of fan electrical power (FEP) and the fan energy index (FEI). Yet, the 48-in. Based on total pressure, the total efficiency of a fan is. Engineers and purchasing managers should understand the wider implications of using these newer fan designs. The maximum fan shaft power allowed by DOE at the design point will be calculated in accordance with the following equation: No other DOE regulation is applied at all conceivable operating conditions. Fan efficiency does not take into effect the efficiency of the drive (belt drive) or the motor. System-level savings can result from the lower power requirements and substantial energy savings can be realized by the end-user. When high-efficiency fans are used, they have a cascade effect on the design of the system. In some instances, 25% or more of the total power budget for a high-end rack system is allocated to the cooling fans.
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