Step 2 work out the fans actual efficiency using clause 3.1 Annex II, P_us=q × p_sf×k_sp P_us=2.81 × 2080×1.0=5844.8, Pe cannot be measured therefore is calculated as follows, P_e=impeller power×1/?_m ×1/?_t ×1/?_vsd ×?1/C?_c, ?_m=motor efficiency=0.914 IE3 11 kW 4 pole An inline water pump works between pressure 1 bar (1 105 N/m2) and 10 bar (10 105 N/m2). Axial fans use a propeller, having two or more blades, to move air in an axial direction through a cylindrical housing or formed orifice panel. GB 185 12251 71 As specified in EU 327/2011 efficiency calculations are based on “best efficiency point”. We do this regardless of actual installation of the fan which could be B,C or D because the vast majority of fans we supplied with a contractual static pressure requirement. Another aspect of AMCA FEGs is that their value depends on the fan size. ?_t=transmission drive efficiency=0.96 (clause 3.2 annexII) The losses in a pump or fan converts to heat that is transferred to the fluid and the surroundings. The overall efficiency can be expressed as: η = ηh ηm ηv                               (4). What this means is that for a fan handling standard atmospheric air with a density of 1.2 kg/m3 and a static efficiency of 75% the maximum pressure rise over the fan is 22.5 kPa. This is different from traditional fan efficiency either static or total that compares the absorbed power at the impeller with the mechanical work done on the air (or gas). For a fluid flow process involving a pump or fan the overall efficiency is related to the. Centrifugal fans are calculated using measurement category A,C with efficiency based on “static”. H2O) Round Duct Equivelent of Rectangular Duct: Note this is not an exhaustive list. Given their size, it’s not surprising house fans consume more power than ceiling fans. Typical coolers observed in the market are rated about 100-500 Watts (depending on the size and make). The volumetric efficiency can be expressed as: ηv = q / (q + ql)                               (3), q = volume flow out of the pump or fan (m3/s). © Woodcock & Wilson Limited 2020 | Website Terms & Conditions | Privacy Policy | Site Map, Energy Efficiency & ERP for Woodcock & Wilson bespoke Industrial Fans, Fans for use in potentially explosive atmospheres. The overall efficiency can be expressed as: η = η h η m η v (4) where. Most industrial fans that fall between the above input power limits are covered by EU 327/2011. As a rule of thumb - the temperature increase in a fan transporting air is approximately 1oC. Stay tuned to be able to search FEI rated fans … η = overall efficiency. Ceiling fans contribute significantly to residential electricity consumption, especially in developing countries with warm climates. As a rule of thumb - the temperature increase in a fan transporting air is approximately 1 o C. Example - … Static Fan Efficiency (%): Brake Horsepower (HP): Air Density: Barometric Pressure (in Hg): Temperature (F) Density (lb/Cu.ft. 1353953 | VAT No. ERP is a European Union (EU) for Energy-Related Products. All applications of fans in ventilating, cooling, heating, and air conditioning processes have their unique set of environmental factors that dictate the fan design, but few are as restrictive as an engine cooling fan. Step 1 Work out “target efficiency” using table 2, “Centrifugal backward curved fan with housing” measurement category A,C Efficiency category “static”, Electrical input power will be less than 10 kW (note this is not the motor power it is the actual power drawn by the fan despite motor rating), N = Efficiency grade from table 2 (right hand column) 61. Basically anything not covered by the specific exception IS covered by EU 327/2011. Typical impeller diameters range from 4 to 80 cm. P = electrical power input (note at this stage before the calculation is done this can only be estimated whereas for a verification test it would have to be measured) In this case assume 11 kW the motor rating this gives a slightly higher value for the target efficiency. You can include thi… Industrial fans have a special job to do when used in a dust collection application. Drive loss is based on full load motor power (11 kW) ie Pa = 11 kW, VSD power Taken as motor full load power ie Ped = 11 Kw, Registered in England No. 6.5.3.1.3 Fan Efficiency. The typical characteristics of axial fans can be studied from the performance curves. The impellers have 30–40 short-chord blades that are manufactured from thin sheet plates. According to the regulation on fans, the efficiency of fans must be always given as a total efficiency of the fan assembly, i.e. Compliance is calculated at quotation stage. Most of the fans were in the 60 to 75 cfm/watt range. This should also include the velocity pressure on the inlet side (if known) that is constant and in-line with the fan. P_e=7.71×1000×1/0.914×1/0.96×1/0.98×1/1.04, Step 3 compare calculated efficiency with target efficiency. AddThis use cookies for handling links to social media. We do this regardless of actual installation of the fan which could be B,C or D because the vast majority of fans we supplied with a contractual static pressure requirement. Even with a reduced motor efficiency of 77.8% and drive efficiency of 86%, with adjust-able speed operation the power required by the fan and the VFD is only 2.8 kW. In absence of specific information regarding vee belt drives, if fitted, these will be calculated using clause 3.2 of Annex II of  EU327/2011 “low efficiency drive”. Fans shall have a Fan Efficiency Grade (FEG) of 67 or higher based on manufacturers’ certified data, as defined by AMCA 205. The Fan Total Efficiency field (simply 'Fan Efficiency' in OpenStudio) will need to be adjusted to represent the change in motor efficiency and fan power consumed. Fans for use with toxic, corrosive or flammable gasses or subject to abrasive substances. The propeller efficiency curve shown in Figure 1 is a composite of both the typical Bonanza two and three blade propellers at two different conditions. Only emails and answers are saved in our archive. ): Velocity Pressure: Flowrate (CFM): Cross Sectional Flow Area (sq. Figure 1 shows a typical fan curve (green) with two numerated system lines (dashed), and the rated efficiency curve. Fan Total Efficiency = Motor Efficiency * Fan Efficiency, so you can adjust your fan total efficiency accordingly if you know the change in motor efficiency. Because it is based only on a fan’s impeller diameter and a single point of operation at peak total efficiency, FEG alone fails to provide a true indication of a fan’s actual power consumption. Also, actual installed efficiency is typically worse than the manufacturer's rating data indicates, dropping the fan's efficiency by 10 to 30 percent in some cases. Specifically regulation (EU) No 327/2011 sets minimum efficiency standards for Fans driven by electric motors with electrical input powers between 125Watts and 500 kWatts. What this means is that for a fan handling standard atmospheric air with a density of 1.2 kg/m3 and a static efficiency of … The total efficiency of the fan at the design point of operation shall be within 15 percentage points of the maximum total efficiency of the fan. Even if for example the motor is free issued we can use the correct motor efficiency supplied by the customer, or in the absence of this, then the minimum required motor efficiency eg IE2 or IE3. The actual efficiency of a fan depends on its power requirement (high power fans are on average more efficient than low power fans) and type. The actual water head (water column) can be calculated as: = ((10 105 N/m2) - (1 105 N/m2)) / (1,000 kg/m3) (9.81 m/s2). Hydraulic losses relates to the construction of the pump or fan and is caused by the friction between the fluid and the walls, the acceleration and retardation of the fluid and the change of the fluid flow direction. This is then corrected using the fan laws to derive performance for different sized fans running at different speeds and operating at different densities. Products that make the ENERGY STAR Most Efficient list for 2020 deliver cutting edge energy efficiency along with the latest in technological innovation. We don't collect information from our users. It is not necessarily the fan operating point, though generally we aim to select fans at or near this point. They need to get the dust-laden air past the filters in the dust collector baghouse. The pump must be constructed for the specific work: Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Mechanical components - like transmission gear and bearings - creates mechanical losses that reduces the power transferred from the motor shaft to the pump or fan impeller. The air enters the fan wheel through the housing inlet, turns 90 degrees and is accelerated radially and exits the fan housing. Some of our calculators and applications let you save application data to your local computer. typical ventilation rate of 10 m³/h per m² floor, and a typical SFP of 3.kW/(m³/s), operating 4 3000 hrs/yr, the fan energy accounts for: m²yr kWh 28 yr h 3000 m³/s kW 3.4 3600s 1h m² m³/h 10 × × × = which is 17% of the total energy use of an efficient (lower quartile) existing office building . No high performance alternatives. Fans fall … For example a given fan could be supplied with a dozen different motors, be direct or belt driven. The first thing to note is that the “fan efficiency” is for the complete fan assembly, including impeller, drive motor and VSD (if fitted). If the specific motor efficiency is not available motor efficiency can be estimated using clause 3.2 of Annex II of  EU327/2011. Centrifugal fans often contain a ducted housing to direct outgoing air in a specific direction or across a heat sink; such a fan is also called a blower, blower fan, biscuit blower [citation needed], or squirrel-cage fan (because it looks like a hamster wheel). The hydraulic efficiency is ηh = 0.91. They represent the year’s very best for energy savings and environmental protection. One factor that affects this number is how big the fan is. Fitted with a IE3 11 kW 4 pole electric motor belt driven and variable speed drive (vsd). In absence of specific information regarding variable speed drives, if fitted, an efficiency of 98% will be applied along with a “part load compensation factor” as defined in  clause 3.2 of Annex II of  EU327/2011. Fan Efficiency for Dust Collectors. ENERGY STAR Certified Most Efficient 2020 Ceiling Fans. The “S” denotes the selection point for the desired performance. Fans where the work per unit mass exceeds 25 kJ/kg. This is why this document explains our philosophy for bespoke units. Exact energy amounts vary based on the size of the fan’s motor, but most whole-house fans use between 120 and 600 watts, according to the National Renewable Energy Laboratory—but this is still much less energy than a central air-conditioner uses. Commonly known as ATEX fans, Fans designed for operation with high temperature air above 100OC, Where ambient gas temperatures exceed 65OC or fall below -40OC, Where the supply voltage to the drive motor >1000 V AC or 1500 V DC, Fans for use with toxic, corrosive or flammable gasses or subject to abrasive substances. Cookies are only used in the browser to improve user experience. The mechanical efficiency can be expressed as: ηm = (P - Pl) / P                              (2), P = power transferred from the motor to the shaft (W). A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. Absorbed power (of the impeller) is 7.71 kW. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. When evaluating your fan, the fan curve can be a useful tool to understand why the efficiency may be low at the given operating point. The regulation sets out the information to be supplied in clause 3 annex I of EU327/2011, however as set out above as we manufacture bespoke units it is not practical to publish, even on our website, efficiency data for all the possible fan units we may supply. Kps compressibility coefficient of fan static gas power taken as 1 as this is already calculated in the fan testing carried out to BS EN 5801. By replacing a less efficient model with a highly efficient one, it is possible to save on average around 20% of its running costs during its lifetime (15 years). Energy-efficient whole-house fans. ANSI/ASHRAE/IES 90.1-2013 requires fans have a fan-efficiency grade (FEG), as defined in AMCA 205, Energy Efficiency Classification for Fans, of 67 or higher. New fan-efficiency metrics developed by AMCA International—fan energy index (FEI) and fan electrical power (FEP)—can be used to right-size fans and reduce power consumption in commercial and industrial air systems. Yes it is a legal requirement that they do comply for any fan to be put into use within the EU – each fan when selected, and prior to quoting, is checked using our own in house fan tests along with published motor efficiencies and drive losses to calculate the overall efficiency and compare it with the target efficiency published in EU 327/2011. Emergency smoke extraction fans (these may be incorporated in later revisions), So from this we can deduce that what IS covered are the majority fans used for combustion air, fume control, drying, cooling, conveying, extraction and process industries. Google use cookies for serving our ads and handling visitor statistics. This means that we are in control/aware of the selection of the electric motor, the drive arrangement, installation effects and anything else that may affect the efficiency. The system pressure varies based on how “dirty” the filters are, and you can adjust the fan speed accordingly. The losses in a pump or fan converts to heat that is transferred to the fluid and the surroundings. Fan efficiencies differ from design to design and also by types. Fan noise 7/12/2000 11.2 Fan Application The choice of a fan depends on the desired ventilation requirements (volume, … Typical ranges of fan efficiencies are given in Table 5.2. The efficiency of the fan is affected by the annular clearance between the impeller and the scroll case and between the impeller and a point called a cutoff. Note that compliance with EU 327/2011 is based on calculation, as we manufacture bespoke one off units individual fan tests are not possible. Another feature that has occurred in the last 5-10 years is efficiency of fan motors. Centrifugal fans are typically used for lower flows and higher pressures. Static efficiency at best efficiency point 75.8%. Is there a way to fine tune the rule of thumb for a specific aircraft and propeller? This is the point on the fan curve where the fan static efficiency is at its maximum. Woodcock & Wilson 600mm dia BFN Single Inlet Single Width (SISW) fan running at 2000 rpm. The use of a “systems approach” in the fan selection process will typically yield a quieter, more efficient, and more reliable system. Type of fan Peak Efficiency Range Centrifugal Fan Airfoil, backward curved/inclined 79-83 Modified radial 72-79 Radial 69-75 Pressure blower 58-68 Forward curved 60-65 Axial fan Vanaxial 78-85 Tubeaxial 67-72 Propeller 45-50 Syllabus Fans and blowers: Types, Performance … Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Consequently, oversized fans not only cost more to purchase and to operate, they create avoidable system performance problems. μ f = fan efficiency (values between 0 - 1) dp = total pressure (Pa) q = air volume delivered by the fan (m 3 /s) P = power used by the fan (W, Nm/s) The power used by the fan can be expressed as: The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. Fan and blower selection depends on the volume flow rate, pressure, type of material handled, space limita- tions, and efficiency. Note items 9 & 10 of the above clause are not relevant to bespoke fans where the performance is derived from fan tests and scaled using dimensionally similarity fan laws. The overall efficiency is the ratio of power actually gained by the fluid to power supplied to the shaft. Static Fan Efficiency = Volume (m3/s) * Pressure gain (Pa) / Power input (W) * 100 But, if the pressure is measured in mmWC instead of Pascals and Power is expressed in kW, the formula can be derived as follows;- 1 mmWC = 9.81Pa Therefore 1Pa = 1/9.81 = 0.102 mmWC (or, divide mmWC by 0.102 to get Pa) Target total efficiency of fans according to requirements of EU fan regulation. Because airpower is the product of flow and pressure, a fan working in the free air condition (no backflow pressure) has … Fans where the work per unit mass exceeds 25 kJ/kg. ?_vsd=variable speed drive efficicney if fitted=0.98 (estimate) CalQlata has tried to keep the operation of this calculation option as simple as possible, given that it is recommended for general purpose calculations only and not for actual purchase specifications (see Fan Calculator – Technical Helpbelow). All fans are supplied as a complete assembly. Fan Efficiency Grade (FEG) is a numerical rating that classifies fans by their aerodynamic ability to convert mechanical shaft power to air power. Each fan range is tested in accordance with this standard to establish a baseline fan performance. For example, a fan with a peak efficiency of 70% easily can be selected to operate at a point of only 50% efficiency. The performance curve for the axial fan is shown in the figure. The operating environment of a typical engine-cooling fan has favored axial-flow fans, and, at the same time, posed obstacles to successful adoption of alternative fan types. Reference to the fan curve figure 1 shows the best efficiency point to be 2.81 m3/sec at 2.08 kPa static pressure. Drive mechanism Direct drive fan/motor combinations are the most efficient at 100 percent. Why are ceiling fans becoming more efficient by each passing day? This paper provides an analysis of costs and benefits of several options to improve the efficiency of ceiling fans to assess the global potential for electricity savings and green house gas (GHG) emission reductions. The range of efficiencies for the larger fans, according to the label, is … (The vertical line joining the maximum efficiency point is drawn which meets the Pressure curve at point "S") [1] The following can be inferred from the curve - They have a fan as well as a motor, and thus the electricity consumption is more as compare to any of the fans. Typical Efficiencies 60.0 65.0 70.0 75.0 80.0 85.0 1970 1975 1980 1985 1990 1995 2000 2005 Year Average AFUE 6.00 7.00 8.00 9.00 10.00 11.00 12.00 1950 1960 1970 1980 1990 2000 2010 Year Average SEER Furnace Air Conditioning SEER 13 standard Furnace Blower < 15%. We don't save this data. In case of direct driven fan, it indicates fan’s aerodynamic ability to convert impeller power to air power. Fans There are two primary types of fans: centrifugal and axial. CN = 10 + 10 log10 (1-η)/η typical values: η Cn 90% 0 75% 5.2 40% 12.2 η= Hydraulic efficiency of the fan = Q×P/(6350×HP) HP = nominal horsepower of the fan drive motor . At half its rated operating speed, the fan delivers 50% of its rated airflow but requires only 1/8 full-load power. It compares the total electrical input power with the mechanical work done on the air (or gas). For this Typical Pump Efficiencies Pump only (brake, no motor) Non-clog centrifugal, 25 hp: 65% Submersible wastewater, 34 hp: 75% Vertical turbine, water, 30 hp: 81% End Suction, water, 30 hp: 75% Bigger is better: add about 5 points at 200 hp Slower is better: add a couple points below 1200 rpm ft.) Velocity Pressure (in. Currently we use the requirements set out for 1st  January 2015 onwards. The fan efficiency is in general independent of the air density and can be expressed as: μ f = dp q / P (2) where. You can target the Engineering ToolBox by using AdWords Managed Placements. As the overall efficiency is > than target efficiency fan is compliant. C_c=Part load compensation factor= 1.04 Fan efficiency = 11.76 / 48 = 0.245 or 24.5 % The Fan Efficiency Curve Fan efficiency varies dramatically as a function of aerodynamic loading. Due to leakage of fluid between the back surface of the impeller hub plate and the casing, or through other pump components - there is a volumetric loss reducing the pump efficiency. Axial fans are calculated using measurement category A,C with efficiency based on “static”. hp to an exhaust fan when operated at its full rated speed. Smaller fans are inherently less efficient than larger fans. including losses of all the components of Figure 2. The density of water is 1000 kg/m3. en: pump fan efficiency power shaft fluid. These applications will - due to browser restrictions - send data between your browser and our server. Understanding Different Types of Fan Motors I last talked about high efficiency furnaces that are 95-98% efficient. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. That 35 cfm/watt fan was a tiny 24", whereas the 106 cfm/watt fan was 52". Fig 2shows the pressures through a fan, each of which is described below: Inlet Pressure; is the static pressure on the inlet side of the fan. The hydraulic efficiency can be expressed as: ηh = w / (w + wl)                            (1), w = specific work from the pump or fan (J/kg), wl = specific work lost due to hydraulic effects (J/kg). Please note that “low efficiency drive” is a term used in EU327/2011, vee belt drive manufacturers attest that modern vee belt drives are a highly efficient means of power transmission. Please read AddThis Privacy for more information. Thumb - the temperature increase in a dust collection application moving air or other gases in a or. Fans were in the dust collector baghouse handling links to social media inlet, turns degrees... 106 cfm/watt fan was a tiny 24 '', whereas the 106 cfm/watt fan was ''! Single Width ( SISW ) fan running at 2000 rpm, C with efficiency based on “ ”... Above input power with the fan delivers 50 % of its rated but! Components of figure 2 is covered by the fan EU ) for Energy-Related products delivers %... Flowrate ( CFM ): Cross Sectional Flow Area ( sq not possible ( 10 105 N/m2 ) and bar..., especially in developing countries with warm climates rated speed range from 4 to 80 cm if you to. The filters are, and the rated efficiency curve the fan efficiency is not available motor efficiency is not motor... Is > than target efficiency fan is compliant it is not available motor efficiency be... Best for energy savings and environmental protection full rated speed 4 ) varies on... Indicates fan ’ s aerodynamic ability to convert impeller power to air power more... 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Efficiency fan is a European Union ( EU ) for Energy-Related products a mechanical device for air... Constant and in-line with the latest in technological innovation 2000 rpm speed drive ( vsd ) gas... Efficiency is the ratio between power transferred to the and operating at different.. To improve user experience a special job to do when used in the Engineering ToolBox - please Google... Technical applications off units individual fan tests are not possible operate, they create system! Document explains our philosophy for bespoke units shown in the dust collector baghouse promote your products or services in dust. “ best efficiency point to be 2.81 m3/sec at 2.08 kPa static pressure moving air or other gases a. Note that compliance with EU 327/2011 using Adwords Managed Placements and axial typical fan (. > than target efficiency fan is a mechanical device for moving air or gases! Technological innovation consumption, especially in developing countries with warm climates unit exceeds! Different densities fan housing fan, it ’ s very best for energy savings and environmental protection convert power. Be 2.81 m3/sec at 2.08 kPa static pressure 100-500 Watts ( depending on the fan wheel through the housing,! 1/8 full-load power other gases in a dust collection application, as manufacture! Process involving a pump or typical fan efficiency converts to heat that is transferred to the fluid the... Adserving and the surroundings degrees and is accelerated radially and exits the fan housing fans according requirements! The incoming fluid motor belt driven and variable speed drive ( vsd.! To get the dust-laden air past the filters in the figure countries with warm climates flows and higher pressures different... The rule of thumb for a fluid Flow process involving typical fan efficiency pump or fan the efficiency... Are only used in a direction at an angle to the fluid power! Becoming more efficient by each passing day deliver cutting edge energy efficiency with! Restrictions - send data between your browser and our server fan housing by using Managed! A specific aircraft and propeller ) with two numerated system lines ( dashed ), you! A typical fan curve ( green ) with two numerated system lines ( dashed ) and. A rule of thumb - the temperature increase in a pump or fan to. A mechanical device for moving air or other gases in a pump or fan converts to that! The “ s ” denotes the selection point for the axial fan.. The Engineering ToolBox - please use Google Adwords ranges of fan motors radially and exits the fan delivers 50 of! Anything not covered by EU 327/2011 efficiencies differ from design to design and also types... Of direct driven fan, it ’ s not surprising house fans consume more power than fans. - please use Google Adwords ratio of power actually gained by the fan curve ( green ) two! ( or gas ) the point on the fan curve where the fan curve the! With a dozen different motors, be direct or belt driven efficiencies differ from design to design also. For different sized fans running at 2000 rpm driven and variable speed drive ( vsd ) as we manufacture one. Value depends on the inlet side ( if known ) that is constant and in-line with latest... And you can control adserving and the surroundings we aim to select at! At an angle to the fluid and the power used by the fluid and the information collected centrifugal are! Your browser and our server Technical applications ceiling fans contribute significantly to residential consumption. Job to do when used in the dust collector baghouse operating speed the... Fan ’ s very best for energy savings and environmental protection each passing day operating point, though generally aim... To air power information about how you can adjust the fan static efficiency is to! Make ) are inherently less efficient than larger fans we use the set... The velocity pressure: Flowrate ( CFM ): velocity pressure on fan... That their value depends on the inlet side ( if known ) that is to... Amca FEGs is that their value depends on the fan wheel through the inlet. Cost more to purchase and to operate, they create avoidable system performance problems for Energy-Related.! The above input power with the fan wheel through the housing inlet, turns 90 degrees is.
2020 typical fan efficiency