!iD@~l][X?.f@j . The Static Efficiency Equation 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: Why Fan Static Efficiency Matters You can use the maximum static efficiency to determine the horsepower you need in your application. The figure below shows the different fan performance curves in terms of airflow. Records and copies of your correspondence (including email addresses), if you contact us. Pout = (200 x 0.5) / 8.5 = 11.76 W A fan in a full shut-off state (no flow) also produces no airpower and has zero efficiencies. 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. Manufacturers generally suggest static efficiency as the efficiency value, whereas total efficiency includes outlet velocity. 0000012378 00000 n Automatically as you navigate through the site. Typically, an axial fans efficiency is at its highest at around 1/3rd the maximum pressure. Engineers and purchasing managers should understand the wider implications of using these newer fan designs. Linquip providers can assist you with this. 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 A better understanding of fan efficiency is now necessary, as it must be weighed against more familiar metrics like airflow and noise. 0000004959 00000 n Using the formula, youll find that this fan will require about 19.7 horsepower, indicating a 20 horsepower motor, to reach the full performance potential of the volume to static pressure ratio. 0000104365 00000 n Already a member? Positive static pressure is created as a fan moves air through a system. is fluid density (in kg/m3) and u is the velocity of flow (in m/s). 0000061697 00000 n While DOE will judge compliance strictly based on FEP (fan electrical power; electrical power supplied to the fan assembly), the DOE test standard will describe FEI as the ratio of the FEP standard (maximum power input allowed, as described above) over the FEP (actual power input) of the fan at its design point. 0000106162 00000 n Senior Application Engineer Chet White explains the factors that determine the optimal industrial fan type and the fan static efficiency calculation in this 12-minute whiteboard tutorial. Jgxi*:ov|n+_d&zz^]wza#"m& nlO44@a0,w2xj@lQfg( ,_yS4nQAeICX'`|p'ha\Xp/HPM0?tK,4#o0 R 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. Positive static pressure is created as air passes through a system by means of fans. A significant shortcoming of the FEG metric is that the highest FEG fan does not necessarily result in the lowest energy consumption. According to the efficiency curves, each fan has a wide range of efficiency depending on airflow and pressure. fan requires the least energy (lowest BHP). peak fan total efficiency or at the peak fan static efficiency, depending on the fan test installation category. \6x.IZ,p])bK2;'GUB 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). Tip Clearance - Distance between the tip Pin (Watts) = V x I (1) For the centrifugal fan whose actual operating point deviates far from the design point, variable frequency drive can be added, the transformation is relatively simple, and the energy saving effect is very obvious. Figure 1 below represents a performance plot of a 120mm size axial fan with curves for both airflow and efficiency. The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. This website uses cookies to improve your experience while you navigate through the website. All Rights Reserved. The terms sheet recommends a long list of exclusions, either because fan energy is already part of another DOE regulation, the fan application requires a design that compromises efficiency, or because the fan type is so rarely used that its aggregate energy use is trivial. As a rule of thumb - the temperature . 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. (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. Recognize you when you return to our Website. use the fan static efficiency calculation to determine what type of industrial fan is optimal for your application, connect with one of our application engineers, Industrial Fan Types and the Fan Static Efficiency Calculation, 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. WG). endstream endobj 67 0 obj <> endobj 68 0 obj <>stream For more information on industrial fan types and calculating 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. We don't save this data. D[Trk8X LX' '{D-YM#;?Zbc2nX> g)^~ZE>w:i]lT!%,$>N+yK+G/>@-pNbnq=Vi>FS` 9`JxV5;qn:8';`'j` ;neo@l"i#'l K/JZ%E\S| vx`?@i12eekC\x;6`-g^B {;}25Cl9&tobXCk. 3|o8U{c-hn;J[)&`coG~aX7J9^/-MOWeX&[%qq9` | endstream endobj 340 0 obj <>stream 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 zUWWWWWWWWWWWWW^\+//|~'({'{boooooR/e;[4Io)muyoq]OW In many production industries, the efficiency of centrifugal fans often directly affects production energy consumption. To fulfill the purpose for which you provide it. Actual Fan Operating Point AMCA 205 recommends that the fan be selected in the system close to the peak of the fan . For example, optimizing the pipeline system to avoid sharp turns or sharp changes in the flow area, or setting guide vanes at the elbow of the pipeline according to the situation to reduce the loss of airflow; another example can make the pipeline at the inlet and outlet of the centrifugal fan long enough Straight pipe section, or use rectifier grille in the pipeline to reduce the turbulence of the airflow in the inlet and outlet pipelines, thereby improving the efficiency of the centrifugal fan. 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.) As part of a continuing effort to create metrics that can be used to drive fan Both static and total efficiency can be calculated from fan performance data as follows: Fig 1: FEG Formula Where: CFM = Fan flow rate, ft3/min Ps = Static pressure, in. As a general rule, fan efficiency increases with blade diameter and speed. Q|uB{Rurg,{{BSc%0oLn^/F;! Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Save my name, email, and website in this browser for the next time I comment. That means that the regulation applies to an infinite set of conditions that define the particular design/selection points (airflows and pressure rises) offered for sale. trailer CI5v!0r t1NzOJ3$g40w64yk67fhH0Yu( 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. Close this window and log in. Your energy consumption is dependent on the style of fans in your system. The losses in a pump or fan converts to heat that is transferred to the fluid and the surroundings. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. 0000063744 00000 n <> stream We expect that the DOE regulation will require that FEI ratings must tie to FEP levels that are certified by the manufacturer to DOE. Table 1: Axial Fans Typical Peak Efficiency, Fan Selection Taking Account of Efficiency. Please provide the following information. In recent years, fan manufacturers have taken steps to develop fans with higher peak efficiencies compared to older designs. This renders the traditional regulatory approach ineffective. Figure 2: Pressure Vs. Flow Curve with Fan Efficiency and System impedance, Benefits of Selecting High Efficiency Fans. If its just moving clean air, why not gain that extra efficiency? Fan total efficiency is calculated using total pressure. Please provide the following information. The flow constant produces a result that is similar to the FEG curves, recognizing that very small fans (and low flows) are less efficient due to the physics of airflow. Details of the FEI metric are documented in an AMCA white paper, downloadable from its website. In heavy material handling applications, theres only one choice. Search Products And Discover New Innovations In Your Industry. Pout (Watts) = (Air pressure x Air flow ) / 8.5 =z-Y1$2/GFffYviW'?"M*yHl?B 0000096577 00000 n There can be a pressure measurement anywhere within a fluid body, regardless of its motion. To carry out our obligations and enforce our rights arising from any contracts entered into between you and us, including for billing and collection. Fan Power Calculation You can calculate the fan power consumption with following input data 1. We also use third-party cookies that help us analyze and understand how you use this website. endobj P is the pressure of the centrifugal fan (Pa); Thats because in backwardly inclined fans, the air or the gas contacts the fan wheel on the inner part of the blade and gradually releases without much friction. <> In other words, if the target efficiency in the DOE formula were 63%, the operating efficiency requirement for this selection at 0.2-in. This article discusses fan efficiency in some detail and provides a PDF for more information. When you know your process involves light particulate, you do have a few other options like the industrial exhaust air handlers and radial designs. hb```f````a`{ B@V8!AW'hzqij``{ (:bm,M: \PRDghi~ 0i Both airflow and the power used by the fan fan Operating Point AMCA 205 recommends that fan. Transferred to airflow and pressure by means of fans and understand how you this! 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