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”. As the overall efficiency is > than target efficiency fan is compliant. Another aspect of AMCA FEGs is that their value depends on the fan size. 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. The overall efficiency is the ratio of power actually gained by the fluid to power supplied to the shaft. Typical coolers observed in the market are rated about 100-500 Watts (depending on the size and make). This should also include the velocity pressure on the inlet side (if known) that is constant and in-line with the fan. The impellers have 30–40 short-chord blades that are manufactured from thin sheet plates. An inline water pump works between pressure 1 bar (1 105 N/m2) and 10 bar (10 105 N/m2). Currently we use the requirements set out for 1st  January 2015 onwards. 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 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. 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. They represent the year’s very best for energy savings and environmental protection. The losses in a pump or fan converts to heat that is transferred to the fluid and the surroundings. Drive mechanism Direct drive fan/motor combinations are the most efficient at 100 percent. © 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. Please read AddThis Privacy for more information. 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. You can target the Engineering ToolBox by using AdWords Managed Placements. For a fluid flow process involving a pump or fan the overall efficiency is related to the. Fans shall have a Fan Efficiency Grade (FEG) of 67 or higher based on manufacturers’ certified data, as defined by AMCA 205. Centrifugal fans are typically used for lower flows and higher pressures. 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. Industrial fans have a special job to do when used in a dust collection application. 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: 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. Fan noise 7/12/2000 11.2 Fan Application The choice of a fan depends on the desired ventilation requirements (volume, … We don't save this data. The volumetric efficiency can be expressed as: ηv = q / (q + ql)                               (3), q = volume flow out of the pump or fan (m3/s). 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 … Consequently, oversized fans not only cost more to purchase and to operate, they create avoidable system performance problems. A centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. ?_t=transmission drive efficiency=0.96 (clause 3.2 annexII) This is the point on the fan curve where the fan static efficiency is at its maximum. For example a given fan could be supplied with a dozen different motors, be direct or belt driven. Each fan range is tested in accordance with this standard to establish a baseline fan performance. The first thing to note is that the “fan efficiency” is for the complete fan assembly, including impeller, drive motor and VSD (if fitted). ): Velocity Pressure: Flowrate (CFM): Cross Sectional Flow Area (sq. 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. 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. They have a fan as well as a motor, and thus the electricity consumption is more as compare to any of the fans. 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. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! For this 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. 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. The mechanical efficiency can be expressed as: ηm = (P - Pl) / P                              (2), P = power transferred from the motor to the shaft (W). The overall efficiency can be expressed as: η = η h η m η v (4) where. 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 . ?_vsd=variable speed drive efficicney if fitted=0.98 (estimate) 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. Ceiling fans contribute significantly to residential electricity consumption, especially in developing countries with warm climates. Products that make the ENERGY STAR Most Efficient list for 2020 deliver cutting edge energy efficiency along with the latest in technological innovation. Because airpower is the product of flow and pressure, a fan working in the free air condition (no backflow pressure) has … The range of efficiencies for the larger fans, according to the label, is … Some of our calculators and applications let you save application data to your local computer. The performance curve for the axial fan is shown in the figure. 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. Energy-efficient whole-house fans. 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. One factor that affects this number is how big the fan is. AddThis use cookies for handling links to social media. Fan efficiencies differ from design to design and also by types. We don't collect information from our users. In case of direct driven fan, it indicates fan’s aerodynamic ability to convert impeller power to air power. Why are ceiling fans becoming more efficient by each passing day? 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. 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 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! Static Fan Efficiency (%): Brake Horsepower (HP): Air Density: Barometric Pressure (in Hg): Temperature (F) Density (lb/Cu.ft. GB 185 12251 71 1353953 | VAT No. Typical ranges of fan efficiencies are given in Table 5.2. 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. At half its rated operating speed, the fan delivers 50% of its rated airflow but requires only 1/8 full-load power. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. 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 . 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 … ERP is a European Union (EU) for Energy-Related Products. They need to get the dust-laden air past the filters in the dust collector baghouse. 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%. Absorbed power (of the impeller) is 7.71 kW. These applications will - due to browser restrictions - send data between your browser and our server. 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). The density of water is 1000 kg/m3. The use of a “systems approach” in the fan selection process will typically yield a quieter, more efficient, and more reliable system. According to the regulation on fans, the efficiency of fans must be always given as a total efficiency of the fan assembly, i.e. For example, a fan with a peak efficiency of 70% easily can be selected to operate at a point of only 50% efficiency. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. 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. 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). Fan efficiency = 11.76 / 48 = 0.245 or 24.5 % The Fan Efficiency Curve Fan efficiency varies dramatically as a function of aerodynamic loading. including losses of all the components of Figure 2. 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). The typical characteristics of axial fans can be studied from the performance curves. H2O) Round Duct Equivelent of Rectangular Duct: 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. Fan and blower selection depends on the volume flow rate, pressure, type of material handled, space limita- tions, and efficiency. As specified in EU 327/2011 efficiency calculations are based on “best efficiency point”. ft.) Velocity Pressure (in. 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. Figure 1 shows a typical fan curve (green) with two numerated system lines (dashed), and the rated efficiency curve. The fan efficiency is in general independent of the air density and can be expressed as: μ f = dp q / P (2) where. 6.5.3.1.3 Fan Efficiency. η = overall efficiency. The air enters the fan wheel through the housing inlet, turns 90 degrees and is accelerated radially and exits the fan housing. This is then corrected using the fan laws to derive performance for different sized fans running at different speeds and operating at different densities. Is there a way to fine tune the rule of thumb for a specific aircraft and propeller? ENERGY STAR Certified Most Efficient 2020 Ceiling Fans. 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 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. 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. Fans where the work per unit mass exceeds 25 kJ/kg. Fan Efficiency for Dust Collectors. Only emails and answers are saved in our archive. 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. 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 system pressure varies based on how “dirty” the filters are, and you can adjust the fan speed accordingly. 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. Note that compliance with EU 327/2011 is based on calculation, as we manufacture bespoke one off units individual fan tests are not possible. You can include thi… Axial fans are calculated using measurement category A,C with efficiency based on “static”. Centrifugal fans are calculated using measurement category A,C with efficiency based on “static”. Fan Total Efficiency = Motor Efficiency * Fan Efficiency, so you can adjust your fan total efficiency accordingly if you know the change in motor efficiency. 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. Fans for use with toxic, corrosive or flammable gasses or subject to abrasive substances. 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. Reference to the fan curve figure 1 shows the best efficiency point to be 2.81 m3/sec at 2.08 kPa static pressure. 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. The overall efficiency can be expressed as: η = ηh ηm ηv                               (4). 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) The losses in a pump or fan converts to heat that is transferred to the fluid and the surroundings. No high performance alternatives. 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. 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 fan efficiency is the ratio between power transferred to airflow and the power used by the fan. Basically anything not covered by the specific exception IS covered by EU 327/2011. 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. 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.
2020 typical fan efficiency