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  2. Friction loss - Wikipedia

    en.wikipedia.org/wiki/Friction_loss

    Note that, in approximation, for a given value of flow volume, a step up in duct size (say from 100mm to 120mm) will reduce the friction loss by a factor of 3. Volumetric Flow Q of air at STP where friction loss per unit length Δ p / L (SI kg / m 2 / s 2 ) is, resp., 0.082, 0.245, and 0.816., for selected Nominal Duct Sizes [ 19 ] in smooth ...

  3. Process duct work - Wikipedia

    en.wikipedia.org/wiki/Process_Duct_Work

    Duct plate 3/16", or thinner, may dishpan, or make noise, and should be avoided. Rectangular duct section properties are calculated from the distance between the upper to lower duct corners of the ductwork The flanges areas are based on the size of corner angles plus duct plate width based on the plate thickness ratio of 16*t.

  4. HyperSizer - Wikipedia

    en.wikipedia.org/wiki/HyperSizer

    HyperSizer is computer-aided engineering (CAE) software used for stress analysis and sizing optimization of metallic and composite structures. Originally developed at the US National Aeronautics and Space Administration (NASA) as ST-SIZE, it was licensed for commercial use by Collier Research Corporation in 1996.

  5. Duct (flow) - Wikipedia

    en.wikipedia.org/wiki/Duct_(flow)

    Round duct is made using a continuous spiral forming machine which can make round duct in nearly any diameter when using the right forming die and to any length to suit, but the most common stock sizes range evenly from 4" to 24" (10-60 cm) with 6"-12" (15-30 cm) being most commonly used.

  6. Atkinson resistance - Wikipedia

    en.wikipedia.org/wiki/Atkinson_resistance

    is the air density in the duct (pounds per cubic foot), is the standard air density (0.075 pound per cubic foot), is the resistance (atkinsons), is the rate of flow of air (thousands of cubic feet per second).

  7. New York’s governor said congestion pricing would hurt the ...

    www.aol.com/york-governor-said-congestion...

    New York was just a few weeks away from becoming the first American city to adopt congestion pricing, a system designed to alleviate traffic, reduce air pollution and fund public transit. Then, at ...

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