1 0 . Fan Curve The graphic presentation of a fan’s performance charac-teristics, showing airflow, static pressure and brake horse - power. • Fan curves shown are applicable to 120/208/240 and 277 volt, single phase ECM motors. WE HAVE THE TECH-NOLOGY. The first thing to note about the fan curve graph is that it has 3 axes: Horizontal Bottom Axis = Air Volume Flow Rate (SCFM or m3/sec.) 5 0 . View Fan Curves.pdf from ENGINEERIN 427 at King Fahad University of Petroleum and Minerals. c = fan curve condition at standard density 1 = inlet, condition 1 2 = outlet, condition 2 in = inlet out = outlet SL = sea level des = design eff = effective. 4 0 . It consist of three curves, 1. Pressure drop due to heating coils are treated as … • Understanding this relationship is essential to designing, operating a fan system and it is the key for optimum selection of fan. To obtain a fan curve the fan is placed in a test rig in which air pressure and volume can be measured and the pressure can be varied by adjusting a damper or venturi of known characteristics. 6 Max Min 1 Row HW 2 Row HW Fan Capacity (CFM) External Static Pressure (”WG) 2200 1800 1400 1000 1000 600 200 0 . fan curves with data from a single model. Fan specification is usually not a precise science and can be done confidently when the fan application is understood. FAN STALL. 2. Consequently, oversized fans not only cost more to purchase and to operate, they create avoidable system performance problems. Static efficiency vs Air Flow rate. Offer NOV.6,2014-R2-order Page 4/9 AHU-01 CAL070 From date 06-Nov-14 Position ClimCalc Vers. These fans are for low to medium static applications. Motor MAX MIN 1 ROW 2 ROW NOTES: 1. The fan will operate at the place where the system line intersects the fan curve. This operating point is at air flow Q 1 delivered against pressure P 1. The fan curve in our example provides some fan noise level information in dBA on the CFM vs SP Curve. It indicates the amount of CFM the fan will provide at a given total static pressure, which is dependent on the connected ducted system. Fans should be selected to operate at the stable region. Fan curves graphically depict fan performance data of CFM, RPM, SP, and BHP. Following the fitting, the equation P(X) is expressed via Chebyshev polynomial. Tonal sounds can increase. Some fan curves will also include an efficiency curve so that a system designer will know where on that curve the fan will be operating under the chosen conditions (see Figure 5.6). 2. The fan speed will change along with the Smart Speed curve. FAN CURVES CFM vs EXTERNAL STATIC PRESSURE FAN SIZE C - AS L3, L4 1/6 H.P. fan curve the operating point lies depends entirely on the ductwork. SELECTION TIPS • When fan stalls, it can’t produce as much lift. IN-LINE FAN CURVE. FAN PERFORMANCE CURVES MQL02 (Fan 09-04 Class I) MQL03 (Fan 09-06 Class I) 16 ENVIRO-TEC MQL Modular Air-Handling Units OR ET9-E 45 MQL06 (Fan 12-09 Class I) MQL04 (Fan 10-07 Class I) ENVIRO-TEC 17 MQL - Units FORM ETEG MQL08 (Fan 12-12 Class I) MQL10 (Fan 15-11 Class I) 18 ENVIRO-TEC MQL Modular Air-Handling Units OR ET9-E 45 MQL12 (Fan 18-13 Class II) MQL12 (Fan 18 … System Effects Most of the time fans are tested with open inlets, and designs that do not have an integral inlet bell will be tested with one to simulate inlet ductwork. When the curve of the system does not cut the curve of the combination, or cut the prolongation of this curve before fan B, fan B will give a higher airflow than the coupling of A and B in parallel. Page 6 of 35 The Basics of Axial Flow Fans Typical Air-Cooled Heat Exchanger Fan Fig. The curves are based on a specific set of conditions which typically include speed, volume, efficiency, static pressure and power required to drive the fan at the given set of conditions. The white dot will create strip chart in real time. (Actually the second mistake is dealt here in Part-1 and the first in Part-2). Tjernlund Products, Inc. • 1601 Ninth Street • White Bear Lake, MN 55110 • (651) 426-2993 • (800) 255-4208 • FAX (651) 426-9547 • www.tjernlund.com 1.25 0 0 500 1000 1500 2000 2500 CFM (STD. Utilizing the function curve and data provided in the reference material, this paper identifies interactions among major parameters affecting the static pressure and flow of the fan. In order to obtain in-situ fan performance curves for variable air volume (VAV) air handling units (AHUs) with predicted uncertainties, airflow measurements for an extended time and a tailored calibration procedure were proposed and validated in this 5. motor is actually mounted in your system can be obtained using the air fl ow-static pressure characteristics curve and system impedance. 5.2. • The fan curve is a graphical representation of a number of inter- related parameters. 3. Fan performance is often represented in the form of fan curves. 2 0 . Oversized fans generate excess flow energy, resulting in high airflow noise and increased stress on the fan and the system. • Fan curves are typically given in terms of total pressure vs. volumetric flow rate • A typical fan running at a fixed speed can provide a greater volumetric flow rate for systems with smaller total pressure drops (if we’re to the right of the peak in the fan curve). Forward Curve- Sometimes referred to as a “squirrel cage” fan, forward curve fans are used in most residential and light commercial HVAC equipment. A review of the 1 2.0 Fan Engineering Nomenclature ACFM - Actual cubic feet per minute of air moved by the fan. Fan curves are simply graphs showing fan performance, normally with air volume on the horizontal “x” axis, and pressure on the vertical “y” axis. Shape of the Curve The shape of the stage curve has an influence on the predictabil ity of off design performance by the fan laws. • Therefore the airflow drops dramatically. The intersection of the system curve and the static pressure curve defines the operating point. Fans and Blowers Bureau of Energy Efficiency 97 Figure 5.5 System Characteristics . 2 0 . Sound levels, efficiency, and other parameters may also be displayed. The method was originally developed for operators of military radar receivers, which is why it is so named. In the many curves shown in the Figure, the curve static pressure (SP) vs. flow is especially important. Default setting compressor curve at one speed and deriving a comparable point at a different speed, for similar conditions, of pressure, temperature, molecular weight and compression exponent. Figure 1 provides a typical illustration of fan curves. Fan Curves. reconcile this field data with the fan curve provided by the manufacturer. The fan curve is graph depicting the various points that the fan can operate. Eldridge works with this type of data every day. A hypothetical system curve is shown at right, along with the same example fan curve as used above and curves for two of the same fan in series, two in parallel, and the same single fan operated at 80% speed, with operating points for each scenario circled. The best way to introduce the concept of FSP is to first point out what it is not. THE FAN LAWS. To select for twin fans, use the curves of single fan with the following factors :- Volume x 2 Absorbed Power x 2.15 Speed x 1.05 Noise + 3 dB This series is available in type S2, C2 or T2 TECHNICAL SPECIFICATION 5 0 . KQFS PSC FAN CURVE, UNIT SIZE 4 KQFS PSC FAN CURVE, UNIT SIZE 5 0 . Fans coupled in series . Knowing how to read and work with a fan curve can keep you out of trouble when selecting a fan for a specific operating condition. This post will address both these mistakes and suggest how to avoid them. BHP vs Air Flow rate. Calculation of the curve for coupled fans. This system curve can then be plotted on the fan curve to show the fan's actual operating point at "A" where the two curves (N 1 and SC 1) intersect. curve of the fan. fan curve and is where the fan is selected to operate. External Static Pressure (ESP) consists of down stream ductwork, coils, flex, duct, etc. ANSYS Motor CFM EXTERNAL STATIC PRESSURE 1.40 1.20 1.00 0.80 0.60 0.40 0.20 0.00 100 300 500 700 900 1100 FAN SIZE D - AS L4 1/4 H.P. • Try to select in the centre of a fan curve when looking at AP fans. Current fan speed How to use the Smart Fan control panel The Smart Fan control panel contains 4 dots which allow you to drag and adjust the Smart Speed slopes. They are the most budget friendly and the least efficient blade design. Notes: 1. Unit Size Coil Airflow CFM (Dry Flo w) Cooling Capacity Water Power Input @ FLA (Watts) Rw FP I C QT (BTUH ) S FlowRate GPM WPD ft-wg 6 3 14 2 600 16000 12000 3.6 7.4 280 4 21000 14000 4.5 15.1 280 10 3 14 2 1000 29000 21000 6.7 37.5 510 4 4 33000 22000 7.3 11.1 510 15 3 14 6 1500 38000 29000 8.5 7.4 … 1 0 . Hudson Products Corp. Unstable operating regions (stall, or left of peak) are typically not shown. BDB Twin Fan BDB series are also available in twin fan version, with two double inlet fans mounted on the same shaft. fan airflow-pressure curve. Fan Curve - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. However, the system impedance cannot be measured without a measuring equipment, so fan with 1.5 to 2 times higher air fl ow than the actual Max air fl ow should be selected (operating air fl ow is one-third to two-thirds of maximum air fl ow). • Fan sounds “rough”, may pulse. 3 0 . • Can create vibration in stall. It simplifies the performance curve of the fan to match the impedance curve of the system. • Fan curves are use to define the operating point. In fact, someone once said that we at Eldridge “study air for a living”. SP vs Air Flow rate. Based on the application, four parameters need to be determined. Unfortunately, this model does not permit the direct calculation of fan efficiency from airflow and pressure; rather, it correlates efficiency to the dimensionless flow term ( φ), which requires both airflow and fan speed as inputs. 3 0 . 380 T: 0844 856 0590 Sentinel Totus2 D-ERV - Mini Model 0 0.05 0.10 0.15 0.20 0.25 0 100 200 300 400 500 600 0.60 0.50 0.40 0.30 0.20 0.10 0.00 Air Volume m3/s Pressure Pa Absorbed Power kW A receiver operating characteristic curve, or ROC curve, is a graphical plot that illustrates the diagnostic ability of a binary classifier system as its discrimination threshold is varied. It then follows that curve segment AC is the left side of the fan curve and is considered to be the unstable portion of the curve. 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