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  1. ApertureScience

    Piping System Resistance Curves

    I should have been a bit more detailed on the sketch. The boxes are just to represent valves and equipment upstream of the processes that the water is being delivered to. The pump will be located on the left side of the sketch. The method for getting the resistance caused by the equipment and...
  2. ApertureScience

    Piping System Resistance Curves

    Looking to calculate the system resistance curve of a piping system that splits to different processes. The required flow rates and pressures are known at the endpoints. What is the method for determining the system resistance curve at the points shown in the attached sketch?
  3. ApertureScience

    Fan Power Equation

    chicopee The power equation for a fan is: H = (Q*PT*KP) / (6356*NT) Where, H = fan shaft power [hp] NT = fan total efficiency [%] Q = fan inlet volumetric flow [acfm] PT = fan total pressure [in. w.c.] 6356 is a conversion factor KP = compressibility factor ProcessHVAC Good heads up info...
  4. ApertureScience

    Fan Power Equation

    I agree, the pressure variable in the horsepower equation is based on total pressure, but the question is, what type of pressure is the compressibility factor based on?
  5. ApertureScience

    Fan Power Equation

    What is the correct type of pressure (static or total) used in the compressibility factor, KP, when calculating fan power? Howden's Fan Engineering book seems to indicate total pressures should be used, but I also have a PDF from Howden that indicates static pressures should be used. Online...

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