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    Fan Curves 2 PDF

    Uploaded by

    dasmech
    This document explains how to read a fan performance curve. It details that fan curves graphically depict performance data including airflow, RPM, static pressure, and brake horsepower. It outlines the process to determine airflow, static pressure, and motor horsepower requirements from a given fan curve by drawing lines between the different axes on the graph. The example shown determines a fan needs 8,000 CFM at 8 inches of static pressure which requires 17.7 brake horsepower.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Fan Curves 2 PDF

    Uploaded by

    dasmech
    99 views5 pages
    This document explains how to read a fan performance curve. It details that fan curves graphically depict performance data including airflow, RPM, static pressure, and brake horsepower. It outlines the process to determine airflow, static pressure, and motor horsepower requirements from a given fan curve by drawing lines between the different axes on the graph. The example shown determines a fan needs 8,000 CFM at 8 inches of static pressure which requires 17.7 brake horsepower.

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    fan curves 2.pdf

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    This document explains how to read a fan performance curve. It details that fan curves graphically depict performance data including airflow, RPM, static pressure, and brake horsepower. It outlines the process to determine airflow, static pressure, and motor horsepower requirements from a given fan curve by drawing lines between the different axes on the graph. The example shown determines a fan needs 8,000 CFM at 8 inches of static pressure which requires 17.7 brake horsepower.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    99 views5 pages

    Fan Curves 2 PDF

    Uploaded by

    dasmech
    This document explains how to read a fan performance curve. It details that fan curves graphically depict performance data including airflow, RPM, static pressure, and brake horsepower. It outlines the process to determine airflow, static pressure, and motor horsepower requirements from a given fan curve by drawing lines between the different axes on the graph. The example shown determines a fan needs 8,000 CFM at 8 inches of static pressure which requires 17.7 brake horsepower.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 5
    At a glance
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    The article discusses how to read and interpret a fan performance curve to select the appropriate fan for a given application.

    You select the desired CFM and static pressure, draw lines between those points and where they intersect the curves to determine the brake horsepower required.

    The fan performance curve shows the CFM vs static pressure curve and the CFM vs brake horsepower curve.

    6/21/2020 How to Read a Fan Performance Curve | G Squared Engineered Products

    G SQUARED ENGINEERED PRODUCTS


    Excellence in Engineered Solutions

    (225) 293-6153

    How to Read a Fan Performance Curve


    Posted on January 16, 2019 in Industrial Fans & Blowers

    Being able to read a fan curve will allow you to choose the best fan for your requirements,
    as long as the fan is properly tested and certified. Fan curves graphically depict fan
    performance data of CFM, RPM, SP, and BHP.

    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.)


    Vertical Left Axis = Static Pressure (inches water gauge [wg], pascals [Pa], or mm
    water gauge)
    Vertical Right Axis = Brake Horsepower (BHP or KW)

    The fan curve graph actually demonstrates two curves related to the same fan:

    https://www.gsquaredep.com/blog/how-to-read-a-fan-performance-curve/ 1/5
    6/21/2020 How to Read a Fan Performance Curve | G Squared Engineered Products

    CFM VS SP CURVES
    The static pressure curve shows the relationship between the static pressure capabilities of
    the fan compared to the fan’s air volume flow rate at a given fan speed.

    CFM VS BHP CURVES


    The second curve shows the relationship between the fan’s air volume flow rate and the
    brake horsepower. (red color curve and axis)

    SELECT YOUR DESIRED CFM


    Once you select your CFM, draw a line vertically up to intersect the CFM vs SP Curves that
    run from lower right to upper left. In our example, we’ve chosen 8,000 CFM, marked with a
    blue vertical line.

    SELECT YOUR DESIRED SP


    Draw a horizontal line through the vertical left axis at the desired fan pressure to where it
    intersects the vertical line you just made. In our example, we’ve chosen 8 inches wg Static
    Pressure. When the intersection of these two lines is not right on the curve, you will need
    to calculate and draw a System Curve and redraw the fan curve at a different RPM [we will
    cover system curves and Affinity or Fan Laws in another post].

    DETERMINE MOTOR HORSEPOWER


    Draw a vertical line up from the point where the System Curve intersects the CFM vs SP
    Curve to where it crosses the CFM vs BHP Curve for the fan. This is the BHP that the fan will
    require to produce the desired CFM and Pressure at the given fan speed.

    To review, in this example, the desired performance is 8,000 CFM at 8 inches wg SP.
    Drawing a line up to the CFM vs BHP Curve indicated that this configuration will require 17.7
    BHP to achieve 8,000 CFM. In this scenario, we would recommend a 25 HP motor to account
    for the belt drive losses and provide some future fan performance adjustments if required.
    https://www.gsquaredep.com/blog/how-to-read-a-fan-performance-curve/ 2/5
    6/21/2020 How to Read a Fan Performance Curve | G Squared Engineered Products

    We generate and select centrifugal fans and curves at G Squared and are always available
    to help with your fan selection needs.

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    https://www.gsquaredep.com/blog/how-to-read-a-fan-performance-curve/ 3/5
    6/21/2020 How to Read a Fan Performance Curve | G Squared Engineered Products

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    Fan Failures Can Happen at Any Time


    October 16, 2019
    Three Types of Spark Resistant Fan Construction
    September 24, 2019
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    August 26, 2019
    Industrial Centrifugal Fan and Blower Wheel Types
    August 9, 2019
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    July 25, 2019

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    6/21/2020 How to Read a Fan Performance Curve | G Squared Engineered Products
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